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{\n\tclampThinkingLevel,\n\tcleanupSessionResources,\n\tgetSupportedThinkingLevels,\n\tisContextOverflow,\n\tmodelsAreEqual,\n\tresetApiProviders,\n} from \"@earendil-works/pi-ai\";\nimport { theme } from \"../modes/interactive/theme/theme.js\";\nimport { stripFrontmatter } from \"../utils/frontmatter.js\";\nimport { sleep } from \"../utils/sleep.js\";\nimport { formatNoApiKeyFoundMessage, formatNoModelSelectedMessage } from \"./auth-guidance.js\";\nimport { type BashResult, executeBashWithOperations } from \"./bash-executor.js\";\nimport {\n\ttype CompactionResult,\n\tcalculateContextTokens,\n\tcollectEntriesForBranchSummary,\n\tcompact,\n\testimateContextTokens,\n\tgenerateBranchSummary,\n\tprepareCompaction,\n\tshouldCompact,\n} from \"./compaction/index.js\";\nimport { DEFAULT_THINKING_LEVEL } from \"./defaults.js\";\nimport { exportSessionToHtml, type ToolHtmlRenderer } from \"./export-html/index.js\";\nimport { createToolHtmlRenderer } from 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\"./prompt-templates.js\";\nimport type { ResourceExtensionPaths, ResourceLoader } from \"./resource-loader.js\";\nimport type { BranchSummaryEntry, CompactionEntry, SessionManager } from \"./session-manager.js\";\nimport { CURRENT_SESSION_VERSION, getLatestCompactionEntry, type SessionHeader } from \"./session-manager.js\";\nimport type { SettingsManager } from \"./settings-manager.js\";\nimport type { SlashCommandInfo } from \"./slash-commands.js\";\nimport { createSyntheticSourceInfo, type SourceInfo } from \"./source-info.js\";\nimport { type BuildSystemPromptOptions, buildSystemPrompt } from \"./system-prompt.js\";\nimport { type BashOperations, createLocalBashOperations } from \"./tools/bash.js\";\nimport { createAllToolDefinitions } from \"./tools/index.js\";\nimport { createToolDefinitionFromAgentTool } from \"./tools/tool-definition-wrapper.js\";\n\n// ============================================================================\n// Skill Block Parsing\n// ============================================================================\n\n/** Parsed skill block from a user message */\nexport interface ParsedSkillBlock {\n\tname: string;\n\tlocation: string;\n\tcontent: string;\n\tuserMessage: string | undefined;\n}\n\n/**\n * Parse a skill block from message text.\n * Returns null if the text doesn't contain a skill block.\n */\nexport function parseSkillBlock(text: string): ParsedSkillBlock | null {\n\tconst match = text.match(/^<skill name=\"([^\"]+)\" location=\"([^\"]+)\">\\n([\\s\\S]*?)\\n<\\/skill>(?:\\n\\n([\\s\\S]+))?$/);\n\tif (!match) return null;\n\treturn {\n\t\tname: match[1],\n\t\tlocation: match[2],\n\t\tcontent: match[3],\n\t\tuserMessage: match[4]?.trim() || undefined,\n\t};\n}\n\n/** Session-specific events that extend the core AgentEvent */\nexport type AgentSessionEvent =\n\t| AgentEvent\n\t| {\n\t\t\ttype: \"queue_update\";\n\t\t\tsteering: readonly string[];\n\t\t\tfollowUp: readonly string[];\n\t  }\n\t| { type: \"compaction_start\"; reason: \"manual\" | \"threshold\" | \"overflow\" }\n\t| { type: \"session_info_changed\"; name: string | undefined }\n\t| { type: \"thinking_level_changed\"; level: ThinkingLevel }\n\t| {\n\t\t\ttype: \"compaction_end\";\n\t\t\treason: \"manual\" | \"threshold\" | \"overflow\";\n\t\t\tresult: CompactionResult | undefined;\n\t\t\taborted: boolean;\n\t\t\twillRetry: boolean;\n\t\t\terrorMessage?: string;\n\t  }\n\t| { type: \"auto_retry_start\"; attempt: number; maxAttempts: number; delayMs: number; errorMessage: string }\n\t| { type: \"auto_retry_end\"; success: boolean; attempt: number; finalError?: string };\n\n/** Listener function for agent session events */\nexport type AgentSessionEventListener = (event: AgentSessionEvent) => void;\n\n// ============================================================================\n// Types\n// ============================================================================\n\nexport interface AgentSessionConfig {\n\tagent: Agent;\n\tsessionManager: SessionManager;\n\tsettingsManager: SettingsManager;\n\tcwd: string;\n\t/** Models to cycle through with Ctrl+P (from --models flag) */\n\tscopedModels?: Array<{ model: Model<any>; thinkingLevel?: ThinkingLevel }>;\n\t/** Resource loader for skills, prompts, themes, context files, system prompt */\n\tresourceLoader: ResourceLoader;\n\t/** SDK custom tools registered outside extensions */\n\tcustomTools?: ToolDefinition[];\n\t/** Model registry for API key resolution and model discovery */\n\tmodelRegistry: ModelRegistry;\n\t/** Initial active built-in tool names. 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Required if streaming. */\n\tstreamingBehavior?: \"steer\" | \"followUp\";\n\t/** Source of input for extension input event handlers. 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Removed when delivered. */\n\tprivate _followUpMessages: string[] = [];\n\t/** Messages queued to be included with the next user prompt as context (\"asides\"). */\n\tprivate _pendingNextTurnMessages: CustomMessage[] = [];\n\n\t// Compaction state\n\tprivate _compactionAbortController: AbortController | undefined = undefined;\n\tprivate _autoCompactionAbortController: AbortController | undefined = undefined;\n\tprivate _overflowRecoveryAttempted = false;\n\n\t// Branch summarization state\n\tprivate _branchSummaryAbortController: AbortController | undefined = undefined;\n\n\t// Retry state\n\tprivate _retryAbortController: AbortController | undefined = undefined;\n\tprivate _retryAttempt = 0;\n\tprivate _retryPromise: Promise<void> | undefined = undefined;\n\tprivate _retryResolve: (() => void) | undefined = undefined;\n\n\t// Bash execution state\n\tprivate _bashAbortController: AbortController | undefined = undefined;\n\tprivate _pendingBashMessages: BashExecutionMessage[] = [];\n\n\t// Extension system\n\tprivate _extensionRunner!: ExtensionRunner;\n\tprivate _turnIndex = 0;\n\n\tprivate _resourceLoader: ResourceLoader;\n\tprivate _customTools: ToolDefinition[];\n\tprivate _baseToolDefinitions: Map<string, ToolDefinition> = new Map();\n\tprivate _cwd: string;\n\tprivate _extensionRunnerRef?: { current?: ExtensionRunner };\n\tprivate _initialActiveToolNames?: string[];\n\tprivate _allowedToolNames?: Set<string>;\n\tprivate _baseToolsOverride?: Record<string, AgentTool>;\n\tprivate _sessionStartEvent: SessionStartEvent;\n\tprivate _extensionUIContext?: ExtensionUIContext;\n\tprivate _extensionCommandContextActions?: ExtensionCommandContextActions;\n\tprivate _extensionShutdownHandler?: ShutdownHandler;\n\tprivate _extensionErrorListener?: ExtensionErrorListener;\n\tprivate _extensionErrorUnsubscriber?: () => void;\n\n\t// Model registry for API key resolution\n\tprivate _modelRegistry: ModelRegistry;\n\n\t// Tool registry for extension getTools/setTools\n\tprivate _toolRegistry: Map<string, AgentTool> = new Map();\n\tprivate _toolDefinitions: Map<string, ToolDefinitionEntry> = new Map();\n\tprivate _toolPromptSnippets: Map<string, string> = new Map();\n\tprivate _toolPromptGuidelines: Map<string, string[]> = new Map();\n\n\t// Base system prompt (without extension appends) - used to apply fresh appends each turn\n\tprivate _baseSystemPrompt = \"\";\n\tprivate _baseSystemPromptOptions!: BuildSystemPromptOptions;\n\n\tconstructor(config: AgentSessionConfig) {\n\t\tthis.agent = config.agent;\n\t\tthis.sessionManager = config.sessionManager;\n\t\tthis.settingsManager = config.settingsManager;\n\t\tthis._scopedModels = config.scopedModels ?? [];\n\t\tthis._resourceLoader = config.resourceLoader;\n\t\tthis._customTools = config.customTools ?? [];\n\t\tthis._cwd = config.cwd;\n\t\tthis._modelRegistry = config.modelRegistry;\n\t\tthis._extensionRunnerRef = config.extensionRunnerRef;\n\t\tthis._initialActiveToolNames = config.initialActiveToolNames;\n\t\tthis._allowedToolNames = config.allowedToolNames ? new Set(config.allowedToolNames) : undefined;\n\t\tthis._baseToolsOverride = config.baseToolsOverride;\n\t\tthis._sessionStartEvent = config.sessionStartEvent ?? { type: \"session_start\", reason: \"startup\" };\n\n\t\t// Always subscribe to agent events for internal handling\n\t\t// (session persistence, extensions, auto-compaction, retry logic)\n\t\tthis._unsubscribeAgent = this.agent.subscribe(this._handleAgentEvent);\n\t\tthis._installAgentToolHooks();\n\n\t\tthis._buildRuntime({\n\t\t\tactiveToolNames: this._initialActiveToolNames,\n\t\t\tincludeAllExtensionTools: true,\n\t\t});\n\t}\n\n\t/** Model registry for API key resolution and model discovery */\n\tget modelRegistry(): ModelRegistry {\n\t\treturn this._modelRegistry;\n\t}\n\n\tprivate async _getRequiredRequestAuth(model: Model<any>): Promise<{\n\t\tapiKey: string;\n\t\theaders?: Record<string, string>;\n\t}> {\n\t\tconst result = await this._modelRegistry.getApiKeyAndHeaders(model);\n\t\tif (!result.ok) {\n\t\t\tif (result.error.startsWith(\"No API key found\")) {\n\t\t\t\tthrow new Error(formatNoApiKeyFoundMessage(model.provider));\n\t\t\t}\n\t\t\tthrow new Error(result.error);\n\t\t}\n\t\tif (result.apiKey) {\n\t\t\treturn { apiKey: result.apiKey, headers: result.headers };\n\t\t}\n\n\t\tconst isOAuth = this._modelRegistry.isUsingOAuth(model);\n\t\tif (isOAuth) {\n\t\t\tthrow new Error(\n\t\t\t\t`Authentication failed for \"${model.provider}\". ` +\n\t\t\t\t\t`Credentials may have expired or network is unavailable. ` +\n\t\t\t\t\t`Run '/login ${model.provider}' to re-authenticate.`,\n\t\t\t);\n\t\t}\n\t\tthrow new Error(formatNoApiKeyFoundMessage(model.provider));\n\t}\n\n\t/**\n\t * Install tool hooks once on the Agent instance.\n\t *\n\t * The callbacks read `this._extensionRunner` at execution time, so extension reload swaps in the\n\t * new runner without reinstalling hooks. Extension-specific tool wrappers are still used to adapt\n\t * registered tool execution to the extension context. Tool call and tool result interception now\n\t * happens here instead of in wrappers.\n\t */\n\tprivate _installAgentToolHooks(): void {\n\t\tthis.agent.beforeToolCall = async ({ toolCall, args }) => {\n\t\t\tconst runner = this._extensionRunner;\n\t\t\tif (!runner.hasHandlers(\"tool_call\")) {\n\t\t\t\treturn undefined;\n\t\t\t}\n\n\t\t\tawait this._agentEventQueue;\n\n\t\t\ttry {\n\t\t\t\treturn await runner.emitToolCall({\n\t\t\t\t\ttype: \"tool_call\",\n\t\t\t\t\ttoolName: toolCall.name,\n\t\t\t\t\ttoolCallId: toolCall.id,\n\t\t\t\t\tinput: args as Record<string, unknown>,\n\t\t\t\t});\n\t\t\t} catch (err) {\n\t\t\t\tif (err instanceof Error) {\n\t\t\t\t\tthrow err;\n\t\t\t\t}\n\t\t\t\tthrow new Error(`Extension failed, blocking execution: ${String(err)}`);\n\t\t\t}\n\t\t};\n\n\t\tthis.agent.afterToolCall = async ({ toolCall, args, result, isError }) => {\n\t\t\tconst runner = this._extensionRunner;\n\t\t\tif (!runner.hasHandlers(\"tool_result\")) {\n\t\t\t\treturn undefined;\n\t\t\t}\n\n\t\t\tconst hookResult = await runner.emitToolResult({\n\t\t\t\ttype: \"tool_result\",\n\t\t\t\ttoolName: toolCall.name,\n\t\t\t\ttoolCallId: toolCall.id,\n\t\t\t\tinput: args as Record<string, unknown>,\n\t\t\t\tcontent: result.content,\n\t\t\t\tdetails: result.details,\n\t\t\t\tisError,\n\t\t\t});\n\n\t\t\tif (!hookResult) {\n\t\t\t\treturn undefined;\n\t\t\t}\n\n\t\t\treturn {\n\t\t\t\tcontent: hookResult.content,\n\t\t\t\tdetails: hookResult.details,\n\t\t\t\tisError: hookResult.isError ?? isError,\n\t\t\t};\n\t\t};\n\t}\n\n\t// =========================================================================\n\t// Event Subscription\n\t// =========================================================================\n\n\t/** Emit an event to all listeners */\n\tprivate _emit(event: AgentSessionEvent): void {\n\t\tfor (const l of this._eventListeners) {\n\t\t\tl(event);\n\t\t}\n\t}\n\n\tprivate _emitQueueUpdate(): void {\n\t\tthis._emit({\n\t\t\ttype: \"queue_update\",\n\t\t\tsteering: [...this._steeringMessages],\n\t\t\tfollowUp: [...this._followUpMessages],\n\t\t});\n\t}\n\n\t// Track last assistant message for auto-compaction check\n\tprivate _lastAssistantMessage: AssistantMessage | undefined = undefined;\n\n\t/** Internal handler for agent events - shared by subscribe and reconnect */\n\tprivate _handleAgentEvent = (event: AgentEvent): void => {\n\t\t// Create retry promise synchronously before queueing async processing.\n\t\t// Agent.emit() calls this handler synchronously, and prompt() calls waitForRetry()\n\t\t// as soon as agent.prompt() resolves. If _retryPromise is created only inside\n\t\t// _processAgentEvent, slow earlier queued events can delay agent_end processing\n\t\t// and waitForRetry() can miss the in-flight retry.\n\t\tthis._createRetryPromiseForAgentEnd(event);\n\n\t\tthis._agentEventQueue = this._agentEventQueue.then(\n\t\t\t() => this._processAgentEvent(event),\n\t\t\t() => this._processAgentEvent(event),\n\t\t);\n\n\t\t// Keep queue alive if an event handler fails\n\t\tthis._agentEventQueue.catch(() => {});\n\t};\n\n\tprivate _createRetryPromiseForAgentEnd(event: AgentEvent): void {\n\t\tif (event.type !== \"agent_end\" || this._retryPromise) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst settings = this.settingsManager.getRetrySettings();\n\t\tif (!settings.enabled) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst lastAssistant = this._findLastAssistantInMessages(event.messages);\n\t\tif (!lastAssistant || !this._isRetryableError(lastAssistant)) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._retryPromise = new Promise((resolve) => {\n\t\t\tthis._retryResolve = resolve;\n\t\t});\n\t}\n\n\tprivate _findLastAssistantInMessages(messages: AgentMessage[]): AssistantMessage | undefined {\n\t\tfor (let i = messages.length - 1; i >= 0; i--) {\n\t\t\tconst message = messages[i];\n\t\t\tif (message.role === \"assistant\") {\n\t\t\t\treturn message as AssistantMessage;\n\t\t\t}\n\t\t}\n\t\treturn undefined;\n\t}\n\n\tprivate async _processAgentEvent(event: AgentEvent): Promise<void> {\n\t\t// When a user message starts, check if it's from either queue and remove it BEFORE emitting\n\t\t// This ensures the UI sees the updated queue state\n\t\tif (event.type === \"message_start\" && event.message.role === \"user\") {\n\t\t\tthis._overflowRecoveryAttempted = false;\n\t\t\tconst messageText = this._getUserMessageText(event.message);\n\t\t\tif (messageText) {\n\t\t\t\t// Check steering queue first\n\t\t\t\tconst steeringIndex = this._steeringMessages.indexOf(messageText);\n\t\t\t\tif (steeringIndex !== -1) {\n\t\t\t\t\tthis._steeringMessages.splice(steeringIndex, 1);\n\t\t\t\t\tthis._emitQueueUpdate();\n\t\t\t\t} else {\n\t\t\t\t\t// Check follow-up queue\n\t\t\t\t\tconst followUpIndex = this._followUpMessages.indexOf(messageText);\n\t\t\t\t\tif (followUpIndex !== -1) {\n\t\t\t\t\t\tthis._followUpMessages.splice(followUpIndex, 1);\n\t\t\t\t\t\tthis._emitQueueUpdate();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Emit to extensions first\n\t\tawait this._emitExtensionEvent(event);\n\n\t\t// Notify all listeners\n\t\tthis._emit(event);\n\n\t\t// Handle session persistence\n\t\tif (event.type === \"message_end\") {\n\t\t\t// Check if this is a custom message from extensions\n\t\t\tif (event.message.role === \"custom\") {\n\t\t\t\t// Persist as CustomMessageEntry\n\t\t\t\tthis.sessionManager.appendCustomMessageEntry(\n\t\t\t\t\tevent.message.customType,\n\t\t\t\t\tevent.message.content,\n\t\t\t\t\tevent.message.display,\n\t\t\t\t\tevent.message.details,\n\t\t\t\t);\n\t\t\t} else if (\n\t\t\t\tevent.message.role === \"user\" ||\n\t\t\t\tevent.message.role === \"assistant\" ||\n\t\t\t\tevent.message.role === \"toolResult\"\n\t\t\t) {\n\t\t\t\t// Regular LLM message - persist as SessionMessageEntry\n\t\t\t\tthis.sessionManager.appendMessage(event.message);\n\t\t\t}\n\t\t\t// Other message types (bashExecution, compactionSummary, branchSummary) are persisted elsewhere\n\n\t\t\t// Track assistant message for auto-compaction (checked on agent_end)\n\t\t\tif (event.message.role === \"assistant\") {\n\t\t\t\tthis._lastAssistantMessage = event.message;\n\n\t\t\t\tconst assistantMsg = event.message as AssistantMessage;\n\t\t\t\tif (assistantMsg.stopReason !== \"error\") {\n\t\t\t\t\tthis._overflowRecoveryAttempted = false;\n\t\t\t\t}\n\n\t\t\t\t// Reset retry counter immediately on successful assistant response\n\t\t\t\t// This prevents accumulation across multiple LLM calls within a turn\n\t\t\t\tif (assistantMsg.stopReason !== \"error\" && this._retryAttempt > 0) {\n\t\t\t\t\tthis._emit({\n\t\t\t\t\t\ttype: \"auto_retry_end\",\n\t\t\t\t\t\tsuccess: true,\n\t\t\t\t\t\tattempt: this._retryAttempt,\n\t\t\t\t\t});\n\t\t\t\t\tthis._retryAttempt = 0;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Check auto-retry and auto-compaction after agent completes\n\t\tif (event.type === \"agent_end\" && this._lastAssistantMessage) {\n\t\t\tconst msg = this._lastAssistantMessage;\n\t\t\tthis._lastAssistantMessage = undefined;\n\n\t\t\t// Check for retryable errors first (overloaded, rate limit, server errors)\n\t\t\tif (this._isRetryableError(msg)) {\n\t\t\t\tconst didRetry = await this._handleRetryableError(msg);\n\t\t\t\tif (didRetry) return; // Retry was initiated, don't proceed to compaction\n\t\t\t}\n\n\t\t\tthis._resolveRetry();\n\t\t\tawait this._checkCompaction(msg);\n\t\t}\n\t}\n\n\t/** Resolve the pending retry promise */\n\tprivate _resolveRetry(): void {\n\t\tif (this._retryResolve) {\n\t\t\tthis._retryResolve();\n\t\t\tthis._retryResolve = undefined;\n\t\t\tthis._retryPromise = undefined;\n\t\t}\n\t}\n\n\t/** Extract text content from a message */\n\tprivate _getUserMessageText(message: Message): string {\n\t\tif (message.role !== \"user\") return \"\";\n\t\tconst content = message.content;\n\t\tif (typeof content === \"string\") return content;\n\t\tconst textBlocks = content.filter((c) => c.type === \"text\");\n\t\treturn textBlocks.map((c) => (c as TextContent).text).join(\"\");\n\t}\n\n\t/** Find the last assistant message in agent state (including aborted ones) */\n\tprivate _findLastAssistantMessage(): AssistantMessage | undefined {\n\t\tconst messages = this.agent.state.messages;\n\t\tfor (let i = messages.length - 1; i >= 0; i--) {\n\t\t\tconst msg = messages[i];\n\t\t\tif (msg.role === \"assistant\") {\n\t\t\t\treturn msg as AssistantMessage;\n\t\t\t}\n\t\t}\n\t\treturn undefined;\n\t}\n\n\tprivate _replaceMessageInPlace(target: AgentMessage, replacement: AgentMessage): void {\n\t\t// Agent-core stores the finalized message object in its state before emitting message_end.\n\t\t// SessionManager persistence happens later in _processAgentEvent() with event.message.\n\t\t// Mutating this object in place keeps agent state, later turn/agent events, listeners,\n\t\t// and the eventual SessionManager.appendMessage(event.message) persistence in sync.\n\t\tif (target === replacement) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst targetRecord = target as unknown as Record<string, unknown>;\n\t\tfor (const key of Object.keys(targetRecord)) {\n\t\t\tdelete targetRecord[key];\n\t\t}\n\t\tObject.assign(targetRecord, replacement);\n\t}\n\n\t/** Emit extension events based on agent events */\n\tprivate async _emitExtensionEvent(event: AgentEvent): Promise<void> {\n\t\tif (event.type === \"agent_start\") {\n\t\t\tthis._turnIndex = 0;\n\t\t\tawait this._extensionRunner.emit({ type: \"agent_start\" });\n\t\t} else if (event.type === \"agent_end\") {\n\t\t\tawait this._extensionRunner.emit({ type: \"agent_end\", messages: event.messages });\n\t\t} else if (event.type === \"turn_start\") {\n\t\t\tconst extensionEvent: TurnStartEvent = {\n\t\t\t\ttype: \"turn_start\",\n\t\t\t\tturnIndex: this._turnIndex,\n\t\t\t\ttimestamp: Date.now(),\n\t\t\t};\n\t\t\tawait this._extensionRunner.emit(extensionEvent);\n\t\t} else if (event.type === \"turn_end\") {\n\t\t\tconst extensionEvent: TurnEndEvent = {\n\t\t\t\ttype: \"turn_end\",\n\t\t\t\tturnIndex: this._turnIndex,\n\t\t\t\tmessage: event.message,\n\t\t\t\ttoolResults: event.toolResults,\n\t\t\t};\n\t\t\tawait this._extensionRunner.emit(extensionEvent);\n\t\t\tthis._turnIndex++;\n\t\t} else if (event.type === \"message_start\") {\n\t\t\tconst extensionEvent: MessageStartEvent = {\n\t\t\t\ttype: \"message_start\",\n\t\t\t\tmessage: event.message,\n\t\t\t};\n\t\t\tawait this._extensionRunner.emit(extensionEvent);\n\t\t} else if (event.type === \"message_update\") {\n\t\t\tconst extensionEvent: MessageUpdateEvent = {\n\t\t\t\ttype: \"message_update\",\n\t\t\t\tmessage: event.message,\n\t\t\t\tassistantMessageEvent: event.assistantMessageEvent,\n\t\t\t};\n\t\t\tawait this._extensionRunner.emit(extensionEvent);\n\t\t} else if (event.type === \"message_end\") {\n\t\t\tconst extensionEvent: MessageEndEvent = {\n\t\t\t\ttype: \"message_end\",\n\t\t\t\tmessage: event.message,\n\t\t\t};\n\t\t\tconst replacement = await this._extensionRunner.emitMessageEnd(extensionEvent);\n\t\t\tif (replacement) {\n\t\t\t\tthis._replaceMessageInPlace(event.message, replacement);\n\t\t\t}\n\t\t} else if (event.type === \"tool_execution_start\") {\n\t\t\tconst extensionEvent: ToolExecutionStartEvent = {\n\t\t\t\ttype: \"tool_execution_start\",\n\t\t\t\ttoolCallId: event.toolCallId,\n\t\t\t\ttoolName: event.toolName,\n\t\t\t\targs: event.args,\n\t\t\t};\n\t\t\tawait this._extensionRunner.emit(extensionEvent);\n\t\t} else if (event.type === \"tool_execution_update\") {\n\t\t\tconst extensionEvent: ToolExecutionUpdateEvent = {\n\t\t\t\ttype: \"tool_execution_update\",\n\t\t\t\ttoolCallId: event.toolCallId,\n\t\t\t\ttoolName: event.toolName,\n\t\t\t\targs: event.args,\n\t\t\t\tpartialResult: event.partialResult,\n\t\t\t};\n\t\t\tawait this._extensionRunner.emit(extensionEvent);\n\t\t} else if (event.type === \"tool_execution_end\") {\n\t\t\tconst extensionEvent: ToolExecutionEndEvent = {\n\t\t\t\ttype: \"tool_execution_end\",\n\t\t\t\ttoolCallId: event.toolCallId,\n\t\t\t\ttoolName: event.toolName,\n\t\t\t\tresult: event.result,\n\t\t\t\tisError: event.isError,\n\t\t\t};\n\t\t\tawait this._extensionRunner.emit(extensionEvent);\n\t\t}\n\t}\n\n\t/**\n\t * Subscribe to agent events.\n\t * Session persistence is handled internally (saves messages on message_end).\n\t * Multiple listeners can be added. Returns unsubscribe function for this listener.\n\t */\n\tsubscribe(listener: AgentSessionEventListener): () => void {\n\t\tthis._eventListeners.push(listener);\n\n\t\t// Return unsubscribe function for this specific listener\n\t\treturn () => {\n\t\t\tconst index = this._eventListeners.indexOf(listener);\n\t\t\tif (index !== -1) {\n\t\t\t\tthis._eventListeners.splice(index, 1);\n\t\t\t}\n\t\t};\n\t}\n\n\t/**\n\t * Temporarily disconnect from agent events.\n\t * User listeners are preserved and will receive events again after resubscribe().\n\t * Used internally during operations that need to pause event processing.\n\t */\n\tprivate _disconnectFromAgent(): void {\n\t\tif (this._unsubscribeAgent) {\n\t\t\tthis._unsubscribeAgent();\n\t\t\tthis._unsubscribeAgent = undefined;\n\t\t}\n\t}\n\n\t/**\n\t * Reconnect to agent events after _disconnectFromAgent().\n\t * Preserves all existing listeners.\n\t */\n\tprivate _reconnectToAgent(): void {\n\t\tif (this._unsubscribeAgent) return; // Already connected\n\t\tthis._unsubscribeAgent = this.agent.subscribe(this._handleAgentEvent);\n\t}\n\n\t/**\n\t * Remove all listeners and disconnect from agent.\n\t * Call this when completely done with the session.\n\t */\n\tdispose(): void {\n\t\tthis._extensionRunner.invalidate(\n\t\t\t\"This extension ctx is stale after session replacement or reload. Do not use a captured pi or command ctx after ctx.newSession(), ctx.fork(), ctx.switchSession(), or ctx.reload(). For newSession, fork, and switchSession, move post-replacement work into withSession and use the ctx passed to withSession. For reload, do not use the old ctx after await ctx.reload().\",\n\t\t);\n\t\tthis._disconnectFromAgent();\n\t\tthis._eventListeners = [];\n\t\tcleanupSessionResources(this.sessionId);\n\t}\n\n\t// =========================================================================\n\t// Read-only State Access\n\t// =========================================================================\n\n\t/** Full agent state */\n\tget state(): AgentState {\n\t\treturn this.agent.state;\n\t}\n\n\t/** Current model (may be undefined if not yet selected) */\n\tget model(): Model<any> | undefined {\n\t\treturn this.agent.state.model;\n\t}\n\n\t/** Current thinking level */\n\tget thinkingLevel(): ThinkingLevel {\n\t\treturn this.agent.state.thinkingLevel;\n\t}\n\n\t/** Whether agent is currently streaming a response */\n\tget isStreaming(): boolean {\n\t\treturn this.agent.state.isStreaming;\n\t}\n\n\t/** Current effective system prompt (includes any per-turn extension modifications) */\n\tget systemPrompt(): string {\n\t\treturn this.agent.state.systemPrompt;\n\t}\n\n\t/** Current retry attempt (0 if not retrying) */\n\tget retryAttempt(): number {\n\t\treturn this._retryAttempt;\n\t}\n\n\t/**\n\t * Get the names of currently active tools.\n\t * Returns the names of tools currently set on the agent.\n\t */\n\tgetActiveToolNames(): string[] {\n\t\treturn this.agent.state.tools.map((t) => t.name);\n\t}\n\n\t/**\n\t * Get all configured tools with name, description, parameter schema, and source metadata.\n\t */\n\tgetAllTools(): ToolInfo[] {\n\t\treturn Array.from(this._toolDefinitions.values()).map(({ definition, sourceInfo }) => ({\n\t\t\tname: definition.name,\n\t\t\tdescription: definition.description,\n\t\t\tparameters: definition.parameters,\n\t\t\tsourceInfo,\n\t\t}));\n\t}\n\n\tgetToolDefinition(name: string): ToolDefinition | undefined {\n\t\treturn this._toolDefinitions.get(name)?.definition;\n\t}\n\n\t/**\n\t * Set active tools by name.\n\t * Only tools in the registry can be enabled. Unknown tool names are ignored.\n\t * Also rebuilds the system prompt to reflect the new tool set.\n\t * Changes take effect on the next agent turn.\n\t */\n\tsetActiveToolsByName(toolNames: string[]): void {\n\t\tconst tools: AgentTool[] = [];\n\t\tconst validToolNames: string[] = [];\n\t\tfor (const name of toolNames) {\n\t\t\tconst tool = this._toolRegistry.get(name);\n\t\t\tif (tool) {\n\t\t\t\ttools.push(tool);\n\t\t\t\tvalidToolNames.push(name);\n\t\t\t}\n\t\t}\n\t\tthis.agent.state.tools = tools;\n\n\t\t// Rebuild base system prompt with new tool set\n\t\tthis._baseSystemPrompt = this._rebuildSystemPrompt(validToolNames);\n\t\tthis.agent.state.systemPrompt = this._baseSystemPrompt;\n\t}\n\n\t/** Whether compaction or branch summarization is currently running */\n\tget isCompacting(): boolean {\n\t\treturn (\n\t\t\tthis._autoCompactionAbortController !== undefined ||\n\t\t\tthis._compactionAbortController !== undefined ||\n\t\t\tthis._branchSummaryAbortController !== undefined\n\t\t);\n\t}\n\n\t/** All messages including custom types like BashExecutionMessage */\n\tget messages(): AgentMessage[] {\n\t\treturn this.agent.state.messages;\n\t}\n\n\t/** Current steering mode */\n\tget steeringMode(): \"all\" | \"one-at-a-time\" {\n\t\treturn this.agent.steeringMode;\n\t}\n\n\t/** Current follow-up mode */\n\tget followUpMode(): \"all\" | \"one-at-a-time\" {\n\t\treturn this.agent.followUpMode;\n\t}\n\n\t/** Current session file path, or undefined if sessions are disabled */\n\tget sessionFile(): string | undefined {\n\t\treturn this.sessionManager.getSessionFile();\n\t}\n\n\t/** Current session ID */\n\tget sessionId(): string {\n\t\treturn this.sessionManager.getSessionId();\n\t}\n\n\t/** Current session display name, if set */\n\tget sessionName(): string | undefined {\n\t\treturn this.sessionManager.getSessionName();\n\t}\n\n\t/** Scoped models for cycling (from --models flag) */\n\tget scopedModels(): ReadonlyArray<{ model: Model<any>; thinkingLevel?: ThinkingLevel }> {\n\t\treturn this._scopedModels;\n\t}\n\n\t/** Update scoped models for cycling */\n\tsetScopedModels(scopedModels: Array<{ model: Model<any>; thinkingLevel?: ThinkingLevel }>): void {\n\t\tthis._scopedModels = scopedModels;\n\t}\n\n\t/** File-based prompt templates */\n\tget promptTemplates(): ReadonlyArray<PromptTemplate> {\n\t\treturn this._resourceLoader.getPrompts().prompts;\n\t}\n\n\tprivate _normalizePromptSnippet(text: string | undefined): string | undefined {\n\t\tif (!text) return undefined;\n\t\tconst oneLine = text\n\t\t\t.replace(/[\\r\\n]+/g, \" \")\n\t\t\t.replace(/\\s+/g, \" \")\n\t\t\t.trim();\n\t\treturn oneLine.length > 0 ? oneLine : undefined;\n\t}\n\n\tprivate _normalizePromptGuidelines(guidelines: string[] | undefined): string[] {\n\t\tif (!guidelines || guidelines.length === 0) {\n\t\t\treturn [];\n\t\t}\n\n\t\tconst unique = new Set<string>();\n\t\tfor (const guideline of guidelines) {\n\t\t\tconst normalized = guideline.trim();\n\t\t\tif (normalized.length > 0) {\n\t\t\t\tunique.add(normalized);\n\t\t\t}\n\t\t}\n\t\treturn Array.from(unique);\n\t}\n\n\tprivate _rebuildSystemPrompt(toolNames: string[]): string {\n\t\tconst validToolNames = toolNames.filter((name) => this._toolRegistry.has(name));\n\t\tconst toolSnippets: Record<string, string> = {};\n\t\tconst promptGuidelines: string[] = [];\n\t\tfor (const name of validToolNames) {\n\t\t\tconst snippet = this._toolPromptSnippets.get(name);\n\t\t\tif (snippet) {\n\t\t\t\ttoolSnippets[name] = snippet;\n\t\t\t}\n\n\t\t\tconst toolGuidelines = this._toolPromptGuidelines.get(name);\n\t\t\tif (toolGuidelines) {\n\t\t\t\tpromptGuidelines.push(...toolGuidelines);\n\t\t\t}\n\t\t}\n\n\t\tconst loaderSystemPrompt = this._resourceLoader.getSystemPrompt();\n\t\tconst loaderAppendSystemPrompt = this._resourceLoader.getAppendSystemPrompt();\n\t\tconst appendSystemPrompt =\n\t\t\tloaderAppendSystemPrompt.length > 0 ? loaderAppendSystemPrompt.join(\"\\n\\n\") : undefined;\n\t\tconst loadedSkills = this._resourceLoader.getSkills().skills;\n\t\tconst loadedContextFiles = this._resourceLoader.getAgentsFiles().agentsFiles;\n\n\t\tthis._baseSystemPromptOptions = {\n\t\t\tcwd: this._cwd,\n\t\t\tskills: loadedSkills,\n\t\t\tcontextFiles: loadedContextFiles,\n\t\t\tcustomPrompt: loaderSystemPrompt,\n\t\t\tappendSystemPrompt,\n\t\t\tselectedTools: validToolNames,\n\t\t\ttoolSnippets,\n\t\t\tpromptGuidelines,\n\t\t};\n\t\treturn buildSystemPrompt(this._baseSystemPromptOptions);\n\t}\n\n\t// =========================================================================\n\t// Prompting\n\t// =========================================================================\n\n\t/**\n\t * Send a prompt to the agent.\n\t * - Handles extension commands (registered via pi.registerCommand) immediately, even during streaming\n\t * - Expands file-based prompt templates by default\n\t * - During streaming, queues via steer() or followUp() based on streamingBehavior option\n\t * - Validates model and API key before sending (when not streaming)\n\t * @throws Error if streaming and no streamingBehavior specified\n\t * @throws Error if no model selected or no API key available (when not streaming)\n\t */\n\tasync prompt(text: string, options?: PromptOptions): Promise<void> {\n\t\tconst expandPromptTemplates = options?.expandPromptTemplates ?? true;\n\t\tconst preflightResult = options?.preflightResult;\n\t\tlet messages: AgentMessage[] | undefined;\n\n\t\ttry {\n\t\t\t// Handle extension commands first (execute immediately, even during streaming)\n\t\t\t// Extension commands manage their own LLM interaction via pi.sendMessage()\n\t\t\tif (expandPromptTemplates && text.startsWith(\"/\")) {\n\t\t\t\tconst handled = await this._tryExecuteExtensionCommand(text);\n\t\t\t\tif (handled) {\n\t\t\t\t\t// Extension command executed, no prompt to send\n\t\t\t\t\tpreflightResult?.(true);\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Emit input event for extension interception (before skill/template expansion)\n\t\t\tlet currentText = text;\n\t\t\tlet currentImages = options?.images;\n\t\t\tif (this._extensionRunner.hasHandlers(\"input\")) {\n\t\t\t\tconst inputResult = await this._extensionRunner.emitInput(\n\t\t\t\t\tcurrentText,\n\t\t\t\t\tcurrentImages,\n\t\t\t\t\toptions?.source ?? \"interactive\",\n\t\t\t\t);\n\t\t\t\tif (inputResult.action === \"handled\") {\n\t\t\t\t\tpreflightResult?.(true);\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\tif (inputResult.action === \"transform\") {\n\t\t\t\t\tcurrentText = inputResult.text;\n\t\t\t\t\tcurrentImages = inputResult.images ?? currentImages;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Expand skill commands (/skill:name args) and prompt templates (/template args)\n\t\t\tlet expandedText = currentText;\n\t\t\tif (expandPromptTemplates) {\n\t\t\t\texpandedText = this._expandSkillCommand(expandedText);\n\t\t\t\texpandedText = expandPromptTemplate(expandedText, [...this.promptTemplates]);\n\t\t\t}\n\n\t\t\t// If streaming, queue via steer() or followUp() based on option\n\t\t\tif (this.isStreaming) {\n\t\t\t\tif (!options?.streamingBehavior) {\n\t\t\t\t\tthrow new Error(\n\t\t\t\t\t\t\"Agent is already processing. Specify streamingBehavior ('steer' or 'followUp') to queue the message.\",\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t\tif (options.streamingBehavior === \"followUp\") {\n\t\t\t\t\tawait this._queueFollowUp(expandedText, currentImages);\n\t\t\t\t} else {\n\t\t\t\t\tawait this._queueSteer(expandedText, currentImages);\n\t\t\t\t}\n\t\t\t\tpreflightResult?.(true);\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Flush any pending bash messages before the new prompt\n\t\t\tthis._flushPendingBashMessages();\n\n\t\t\t// Validate model\n\t\t\tif (!this.model) {\n\t\t\t\tthrow new Error(formatNoModelSelectedMessage());\n\t\t\t}\n\n\t\t\tif (!this._modelRegistry.hasConfiguredAuth(this.model)) {\n\t\t\t\tconst isOAuth = this._modelRegistry.isUsingOAuth(this.model);\n\t\t\t\tif (isOAuth) {\n\t\t\t\t\tthrow new Error(\n\t\t\t\t\t\t`Authentication failed for \"${this.model.provider}\". ` +\n\t\t\t\t\t\t\t`Credentials may have expired or network is unavailable. ` +\n\t\t\t\t\t\t\t`Run '/login ${this.model.provider}' to re-authenticate.`,\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t\tthrow new Error(formatNoApiKeyFoundMessage(this.model.provider));\n\t\t\t}\n\n\t\t\t// Check if we need to compact before sending (catches aborted responses)\n\t\t\tconst lastAssistant = this._findLastAssistantMessage();\n\t\t\tif (lastAssistant) {\n\t\t\t\tawait this._checkCompaction(lastAssistant, false);\n\t\t\t}\n\n\t\t\t// Build messages array (custom message if any, then user message)\n\t\t\tmessages = [];\n\n\t\t\t// Add user message\n\t\t\tconst userContent: (TextContent | ImageContent)[] = [{ type: \"text\", text: expandedText }];\n\t\t\tif (currentImages) {\n\t\t\t\tuserContent.push(...currentImages);\n\t\t\t}\n\t\t\tmessages.push({\n\t\t\t\trole: \"user\",\n\t\t\t\tcontent: userContent,\n\t\t\t\ttimestamp: Date.now(),\n\t\t\t});\n\n\t\t\t// Inject any pending \"nextTurn\" messages as context alongside the user message\n\t\t\tfor (const msg of this._pendingNextTurnMessages) {\n\t\t\t\tmessages.push(msg);\n\t\t\t}\n\t\t\tthis._pendingNextTurnMessages = [];\n\n\t\t\t// Emit before_agent_start extension event\n\t\t\tconst result = await this._extensionRunner.emitBeforeAgentStart(\n\t\t\t\texpandedText,\n\t\t\t\tcurrentImages,\n\t\t\t\tthis._baseSystemPrompt,\n\t\t\t\tthis._baseSystemPromptOptions,\n\t\t\t);\n\t\t\t// Add all custom messages from extensions\n\t\t\tif (result?.messages) {\n\t\t\t\tfor (const msg of result.messages) {\n\t\t\t\t\tmessages.push({\n\t\t\t\t\t\trole: \"custom\",\n\t\t\t\t\t\tcustomType: msg.customType,\n\t\t\t\t\t\tcontent: msg.content,\n\t\t\t\t\t\tdisplay: msg.display,\n\t\t\t\t\t\tdetails: msg.details,\n\t\t\t\t\t\ttimestamp: Date.now(),\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// Apply extension-modified system prompt, or reset to base\n\t\t\tif (result?.systemPrompt) {\n\t\t\t\tthis.agent.state.systemPrompt = result.systemPrompt;\n\t\t\t} else {\n\t\t\t\t// Ensure we're using the base prompt (in case previous turn had modifications)\n\t\t\t\tthis.agent.state.systemPrompt = this._baseSystemPrompt;\n\t\t\t}\n\t\t} catch (error) {\n\t\t\tpreflightResult?.(false);\n\t\t\tthrow error;\n\t\t}\n\n\t\tif (!messages) {\n\t\t\treturn;\n\t\t}\n\n\t\tpreflightResult?.(true);\n\t\tawait this.agent.prompt(messages);\n\t\tawait this.waitForRetry();\n\t}\n\n\t/**\n\t * Try to execute an extension command. Returns true if command was found and executed.\n\t */\n\tprivate async _tryExecuteExtensionCommand(text: string): Promise<boolean> {\n\t\t// Parse command name and args\n\t\tconst spaceIndex = text.indexOf(\" \");\n\t\tconst commandName = spaceIndex === -1 ? text.slice(1) : text.slice(1, spaceIndex);\n\t\tconst args = spaceIndex === -1 ? \"\" : text.slice(spaceIndex + 1);\n\n\t\tconst command = this._extensionRunner.getCommand(commandName);\n\t\tif (!command) return false;\n\n\t\t// Get command context from extension runner (includes session control methods)\n\t\tconst ctx = this._extensionRunner.createCommandContext();\n\n\t\ttry {\n\t\t\tawait command.handler(args, ctx);\n\t\t\treturn true;\n\t\t} catch (err) {\n\t\t\t// Emit error via extension runner\n\t\t\tthis._extensionRunner.emitError({\n\t\t\t\textensionPath: `command:${commandName}`,\n\t\t\t\tevent: \"command\",\n\t\t\t\terror: err instanceof Error ? err.message : String(err),\n\t\t\t});\n\t\t\treturn true;\n\t\t}\n\t}\n\n\t/**\n\t * Expand skill commands (/skill:name args) to their full content.\n\t * Returns the expanded text, or the original text if not a skill command or skill not found.\n\t * Emits errors via extension runner if file read fails.\n\t */\n\tprivate _expandSkillCommand(text: string): string {\n\t\tif (!text.startsWith(\"/skill:\")) return text;\n\n\t\tconst spaceIndex = text.indexOf(\" \");\n\t\tconst skillName = spaceIndex === -1 ? text.slice(7) : text.slice(7, spaceIndex);\n\t\tconst args = spaceIndex === -1 ? \"\" : text.slice(spaceIndex + 1).trim();\n\n\t\tconst skill = this.resourceLoader.getSkills().skills.find((s) => s.name === skillName);\n\t\tif (!skill) return text; // Unknown skill, pass through\n\n\t\ttry {\n\t\t\tconst content = readFileSync(skill.filePath, \"utf-8\");\n\t\t\tconst body = stripFrontmatter(content).trim();\n\t\t\tconst skillBlock = `<skill name=\"${skill.name}\" location=\"${skill.filePath}\">\\nReferences are relative to ${skill.baseDir}.\\n\\n${body}\\n</skill>`;\n\t\t\treturn args ? `${skillBlock}\\n\\n${args}` : skillBlock;\n\t\t} catch (err) {\n\t\t\t// Emit error like extension commands do\n\t\t\tthis._extensionRunner.emitError({\n\t\t\t\textensionPath: skill.filePath,\n\t\t\t\tevent: \"skill_expansion\",\n\t\t\t\terror: err instanceof Error ? err.message : String(err),\n\t\t\t});\n\t\t\treturn text; // Return original on error\n\t\t}\n\t}\n\n\t/**\n\t * Queue a steering message while the agent is running.\n\t * Delivered after the current assistant turn finishes executing its tool calls,\n\t * before the next LLM call.\n\t * Expands skill commands and prompt templates. Errors on extension commands.\n\t * @param images Optional image attachments to include with the message\n\t * @throws Error if text is an extension command\n\t */\n\tasync steer(text: string, images?: ImageContent[]): Promise<void> {\n\t\t// Check for extension commands (cannot be queued)\n\t\tif (text.startsWith(\"/\")) {\n\t\t\tthis._throwIfExtensionCommand(text);\n\t\t}\n\n\t\t// Expand skill commands and prompt templates\n\t\tlet expandedText = this._expandSkillCommand(text);\n\t\texpandedText = expandPromptTemplate(expandedText, [...this.promptTemplates]);\n\n\t\tawait this._queueSteer(expandedText, images);\n\t}\n\n\t/**\n\t * Queue a follow-up message to be processed after the agent finishes.\n\t * Delivered only when agent has no more tool calls or steering messages.\n\t * Expands skill commands and prompt templates. Errors on extension commands.\n\t * @param images Optional image attachments to include with the message\n\t * @throws Error if text is an extension command\n\t */\n\tasync followUp(text: string, images?: ImageContent[]): Promise<void> {\n\t\t// Check for extension commands (cannot be queued)\n\t\tif (text.startsWith(\"/\")) {\n\t\t\tthis._throwIfExtensionCommand(text);\n\t\t}\n\n\t\t// Expand skill commands and prompt templates\n\t\tlet expandedText = this._expandSkillCommand(text);\n\t\texpandedText = expandPromptTemplate(expandedText, [...this.promptTemplates]);\n\n\t\tawait this._queueFollowUp(expandedText, images);\n\t}\n\n\t/**\n\t * Internal: Queue a steering message (already expanded, no extension command check).\n\t */\n\tprivate async _queueSteer(text: string, images?: ImageContent[]): Promise<void> {\n\t\tthis._steeringMessages.push(text);\n\t\tthis._emitQueueUpdate();\n\t\tconst content: (TextContent | ImageContent)[] = [{ type: \"text\", text }];\n\t\tif (images) {\n\t\t\tcontent.push(...images);\n\t\t}\n\t\tthis.agent.steer({\n\t\t\trole: \"user\",\n\t\t\tcontent,\n\t\t\ttimestamp: Date.now(),\n\t\t});\n\t}\n\n\t/**\n\t * Internal: Queue a follow-up message (already expanded, no extension command check).\n\t */\n\tprivate async _queueFollowUp(text: string, images?: ImageContent[]): Promise<void> {\n\t\tthis._followUpMessages.push(text);\n\t\tthis._emitQueueUpdate();\n\t\tconst content: (TextContent | ImageContent)[] = [{ type: \"text\", text }];\n\t\tif (images) {\n\t\t\tcontent.push(...images);\n\t\t}\n\t\tthis.agent.followUp({\n\t\t\trole: \"user\",\n\t\t\tcontent,\n\t\t\ttimestamp: Date.now(),\n\t\t});\n\t}\n\n\t/**\n\t * Throw an error if the text is an extension command.\n\t */\n\tprivate _throwIfExtensionCommand(text: string): void {\n\t\tconst spaceIndex = text.indexOf(\" \");\n\t\tconst commandName = spaceIndex === -1 ? text.slice(1) : text.slice(1, spaceIndex);\n\t\tconst command = this._extensionRunner.getCommand(commandName);\n\n\t\tif (command) {\n\t\t\tthrow new Error(\n\t\t\t\t`Extension command \"/${commandName}\" cannot be queued. Use prompt() or execute the command when not streaming.`,\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * Send a custom message to the session. Creates a CustomMessageEntry.\n\t *\n\t * Handles three cases:\n\t * - Streaming: queues message, processed when loop pulls from queue\n\t * - Not streaming + triggerTurn: appends to state/session, starts new turn\n\t * - Not streaming + no trigger: appends to state/session, no turn\n\t *\n\t * @param message Custom message with customType, content, display, details\n\t * @param options.triggerTurn If true and not streaming, triggers a new LLM turn\n\t * @param options.deliverAs Delivery mode: \"steer\", \"followUp\", or \"nextTurn\"\n\t */\n\tasync sendCustomMessage<T = unknown>(\n\t\tmessage: Pick<CustomMessage<T>, \"customType\" | \"content\" | \"display\" | \"details\">,\n\t\toptions?: { triggerTurn?: boolean; deliverAs?: \"steer\" | \"followUp\" | \"nextTurn\" },\n\t): Promise<void> {\n\t\tconst appMessage = {\n\t\t\trole: \"custom\" as const,\n\t\t\tcustomType: message.customType,\n\t\t\tcontent: message.content,\n\t\t\tdisplay: message.display,\n\t\t\tdetails: message.details,\n\t\t\ttimestamp: Date.now(),\n\t\t} satisfies CustomMessage<T>;\n\t\tif (options?.deliverAs === \"nextTurn\") {\n\t\t\tthis._pendingNextTurnMessages.push(appMessage);\n\t\t} else if (this.isStreaming) {\n\t\t\tif (options?.deliverAs === \"followUp\") {\n\t\t\t\tthis.agent.followUp(appMessage);\n\t\t\t} else {\n\t\t\t\tthis.agent.steer(appMessage);\n\t\t\t}\n\t\t} else if (options?.triggerTurn) {\n\t\t\tawait this.agent.prompt(appMessage);\n\t\t} else {\n\t\t\tthis.agent.state.messages.push(appMessage);\n\t\t\tthis.sessionManager.appendCustomMessageEntry(\n\t\t\t\tmessage.customType,\n\t\t\t\tmessage.content,\n\t\t\t\tmessage.display,\n\t\t\t\tmessage.details,\n\t\t\t);\n\t\t\tthis._emit({ type: \"message_start\", message: appMessage });\n\t\t\tthis._emit({ type: \"message_end\", message: appMessage });\n\t\t}\n\t}\n\n\t/**\n\t * Send a user message to the agent. Always triggers a turn.\n\t * When the agent is streaming, use deliverAs to specify how to queue the message.\n\t *\n\t * @param content User message content (string or content array)\n\t * @param options.deliverAs Delivery mode when streaming: \"steer\" or \"followUp\"\n\t */\n\tasync sendUserMessage(\n\t\tcontent: string | (TextContent | ImageContent)[],\n\t\toptions?: { deliverAs?: \"steer\" | \"followUp\" },\n\t): Promise<void> {\n\t\t// Normalize content to text string + optional images\n\t\tlet text: string;\n\t\tlet images: ImageContent[] | undefined;\n\n\t\tif (typeof content === \"string\") {\n\t\t\ttext = content;\n\t\t} else {\n\t\t\tconst textParts: string[] = [];\n\t\t\timages = [];\n\t\t\tfor (const part of content) {\n\t\t\t\tif (part.type === \"text\") {\n\t\t\t\t\ttextParts.push(part.text);\n\t\t\t\t} else {\n\t\t\t\t\timages.push(part);\n\t\t\t\t}\n\t\t\t}\n\t\t\ttext = textParts.join(\"\\n\");\n\t\t\tif (images.length === 0) images = undefined;\n\t\t}\n\n\t\t// Use prompt() with expandPromptTemplates: false to skip command handling and template expansion\n\t\tawait this.prompt(text, {\n\t\t\texpandPromptTemplates: false,\n\t\t\tstreamingBehavior: options?.deliverAs,\n\t\t\timages,\n\t\t\tsource: \"extension\",\n\t\t});\n\t}\n\n\t/**\n\t * Clear all queued messages and return them.\n\t * Useful for restoring to editor when user aborts.\n\t * @returns Object with steering and followUp arrays\n\t */\n\tclearQueue(): { steering: string[]; followUp: string[] } {\n\t\tconst steering = [...this._steeringMessages];\n\t\tconst followUp = [...this._followUpMessages];\n\t\tthis._steeringMessages = [];\n\t\tthis._followUpMessages = [];\n\t\tthis.agent.clearAllQueues();\n\t\tthis._emitQueueUpdate();\n\t\treturn { steering, followUp };\n\t}\n\n\t/** Number of pending messages (includes both steering and follow-up) */\n\tget pendingMessageCount(): number {\n\t\treturn this._steeringMessages.length + this._followUpMessages.length;\n\t}\n\n\t/** Get pending steering messages (read-only) */\n\tgetSteeringMessages(): readonly string[] {\n\t\treturn this._steeringMessages;\n\t}\n\n\t/** Get pending follow-up messages (read-only) */\n\tgetFollowUpMessages(): readonly string[] {\n\t\treturn this._followUpMessages;\n\t}\n\n\tget resourceLoader(): ResourceLoader {\n\t\treturn this._resourceLoader;\n\t}\n\n\t/**\n\t * Abort current operation and wait for agent to become idle.\n\t */\n\tasync abort(): Promise<void> {\n\t\tthis.abortRetry();\n\t\tthis.agent.abort();\n\t\tawait this.agent.waitForIdle();\n\t}\n\n\t// =========================================================================\n\t// Model Management\n\t// =========================================================================\n\n\tprivate async _emitModelSelect(\n\t\tnextModel: Model<any>,\n\t\tpreviousModel: Model<any> | undefined,\n\t\tsource: \"set\" | \"cycle\" | \"restore\",\n\t): Promise<void> {\n\t\tif (modelsAreEqual(previousModel, nextModel)) return;\n\t\tawait this._extensionRunner.emit({\n\t\t\ttype: \"model_select\",\n\t\t\tmodel: nextModel,\n\t\t\tpreviousModel,\n\t\t\tsource,\n\t\t});\n\t}\n\n\t/**\n\t * Set model directly.\n\t * Validates that auth is configured, saves to session and settings.\n\t * @throws Error if no auth is configured for the model\n\t */\n\tasync setModel(model: Model<any>): Promise<void> {\n\t\tif (!this._modelRegistry.hasConfiguredAuth(model)) {\n\t\t\tthrow new Error(`No API key for ${model.provider}/${model.id}`);\n\t\t}\n\n\t\tconst previousModel = this.model;\n\t\tconst thinkingLevel = this._getThinkingLevelForModelSwitch();\n\t\tthis.agent.state.model = model;\n\t\tthis.sessionManager.appendModelChange(model.provider, model.id);\n\t\tthis.settingsManager.setDefaultModelAndProvider(model.provider, model.id);\n\n\t\t// Re-clamp thinking level for new model's capabilities\n\t\tthis.setThinkingLevel(thinkingLevel);\n\n\t\tawait this._emitModelSelect(model, previousModel, \"set\");\n\t}\n\n\t/**\n\t * Cycle to next/previous model.\n\t * Uses scoped models (from --models flag) if available, otherwise all available models.\n\t * @param direction - \"forward\" (default) or \"backward\"\n\t * @returns The new model info, or undefined if only one model available\n\t */\n\tasync cycleModel(direction: \"forward\" | \"backward\" = \"forward\"): Promise<ModelCycleResult | undefined> {\n\t\tif (this._scopedModels.length > 0) {\n\t\t\treturn this._cycleScopedModel(direction);\n\t\t}\n\t\treturn this._cycleAvailableModel(direction);\n\t}\n\n\tprivate async _cycleScopedModel(direction: \"forward\" | \"backward\"): Promise<ModelCycleResult | undefined> {\n\t\tconst scopedModels = this._scopedModels.filter((scoped) => this._modelRegistry.hasConfiguredAuth(scoped.model));\n\t\tif (scopedModels.length <= 1) return undefined;\n\n\t\tconst currentModel = this.model;\n\t\tlet currentIndex = scopedModels.findIndex((sm) => modelsAreEqual(sm.model, currentModel));\n\n\t\tif (currentIndex === -1) currentIndex = 0;\n\t\tconst len = scopedModels.length;\n\t\tconst nextIndex = direction === \"forward\" ? (currentIndex + 1) % len : (currentIndex - 1 + len) % len;\n\t\tconst next = scopedModels[nextIndex];\n\t\tconst thinkingLevel = this._getThinkingLevelForModelSwitch(next.thinkingLevel);\n\n\t\t// Apply model\n\t\tthis.agent.state.model = next.model;\n\t\tthis.sessionManager.appendModelChange(next.model.provider, next.model.id);\n\t\tthis.settingsManager.setDefaultModelAndProvider(next.model.provider, next.model.id);\n\n\t\t// Apply thinking level.\n\t\t// - Explicit scoped model thinking level overrides current session level\n\t\t// - Undefined scoped model thinking level inherits the current session preference\n\t\t// setThinkingLevel clamps to model capabilities.\n\t\tthis.setThinkingLevel(thinkingLevel);\n\n\t\tawait this._emitModelSelect(next.model, currentModel, \"cycle\");\n\n\t\treturn { model: next.model, thinkingLevel: this.thinkingLevel, isScoped: true };\n\t}\n\n\tprivate async _cycleAvailableModel(direction: \"forward\" | \"backward\"): Promise<ModelCycleResult | undefined> {\n\t\tconst availableModels = await this._modelRegistry.getAvailable();\n\t\tif (availableModels.length <= 1) return undefined;\n\n\t\tconst currentModel = this.model;\n\t\tlet currentIndex = availableModels.findIndex((m) => modelsAreEqual(m, currentModel));\n\n\t\tif (currentIndex === -1) currentIndex = 0;\n\t\tconst len = availableModels.length;\n\t\tconst nextIndex = direction === \"forward\" ? (currentIndex + 1) % len : (currentIndex - 1 + len) % len;\n\t\tconst nextModel = availableModels[nextIndex];\n\n\t\tconst thinkingLevel = this._getThinkingLevelForModelSwitch();\n\t\tthis.agent.state.model = nextModel;\n\t\tthis.sessionManager.appendModelChange(nextModel.provider, nextModel.id);\n\t\tthis.settingsManager.setDefaultModelAndProvider(nextModel.provider, nextModel.id);\n\n\t\t// Re-clamp thinking level for new model's capabilities\n\t\tthis.setThinkingLevel(thinkingLevel);\n\n\t\tawait this._emitModelSelect(nextModel, currentModel, \"cycle\");\n\n\t\treturn { model: nextModel, thinkingLevel: this.thinkingLevel, isScoped: false };\n\t}\n\n\t// =========================================================================\n\t// Thinking Level Management\n\t// =========================================================================\n\n\t/**\n\t * Set thinking level.\n\t * Clamps to model capabilities based on available thinking levels.\n\t * Saves to session and settings only if the level actually changes.\n\t */\n\tsetThinkingLevel(level: ThinkingLevel): void {\n\t\tconst availableLevels = this.getAvailableThinkingLevels();\n\t\tconst effectiveLevel = availableLevels.includes(level) ? level : this._clampThinkingLevel(level, availableLevels);\n\n\t\t// Only persist if actually changing\n\t\tconst previousLevel = this.agent.state.thinkingLevel;\n\t\tconst isChanging = effectiveLevel !== previousLevel;\n\n\t\tthis.agent.state.thinkingLevel = effectiveLevel;\n\n\t\tif (isChanging) {\n\t\t\tthis.sessionManager.appendThinkingLevelChange(effectiveLevel);\n\t\t\tif (this.supportsThinking() || effectiveLevel !== \"off\") {\n\t\t\t\tthis.settingsManager.setDefaultThinkingLevel(effectiveLevel);\n\t\t\t}\n\t\t\tthis._emit({ type: \"thinking_level_changed\", level: effectiveLevel });\n\t\t\tvoid this._extensionRunner.emit({\n\t\t\t\ttype: \"thinking_level_select\",\n\t\t\t\tlevel: effectiveLevel,\n\t\t\t\tpreviousLevel,\n\t\t\t});\n\t\t}\n\t}\n\n\t/**\n\t * Cycle to next thinking level.\n\t * @returns New level, or undefined if model doesn't support thinking\n\t */\n\tcycleThinkingLevel(): ThinkingLevel | undefined {\n\t\tif (!this.supportsThinking()) return undefined;\n\n\t\tconst levels = this.getAvailableThinkingLevels();\n\t\tconst currentIndex = levels.indexOf(this.thinkingLevel);\n\t\tconst nextIndex = (currentIndex + 1) % levels.length;\n\t\tconst nextLevel = levels[nextIndex];\n\n\t\tthis.setThinkingLevel(nextLevel);\n\t\treturn nextLevel;\n\t}\n\n\t/**\n\t * Get available thinking levels for current model.\n\t * The provider will clamp to what the specific model supports internally.\n\t */\n\tgetAvailableThinkingLevels(): ThinkingLevel[] {\n\t\tif (!this.model) return THINKING_LEVELS;\n\t\treturn getSupportedThinkingLevels(this.model) as ThinkingLevel[];\n\t}\n\n\t/**\n\t * Check if current model supports thinking/reasoning.\n\t */\n\tsupportsThinking(): boolean {\n\t\treturn !!this.model?.reasoning;\n\t}\n\n\tprivate _getThinkingLevelForModelSwitch(explicitLevel?: ThinkingLevel): ThinkingLevel {\n\t\tif (explicitLevel !== undefined) {\n\t\t\treturn explicitLevel;\n\t\t}\n\t\tif (!this.supportsThinking()) {\n\t\t\treturn this.settingsManager.getDefaultThinkingLevel() ?? DEFAULT_THINKING_LEVEL;\n\t\t}\n\t\treturn this.thinkingLevel;\n\t}\n\n\tprivate _clampThinkingLevel(level: ThinkingLevel, _availableLevels: ThinkingLevel[]): ThinkingLevel {\n\t\treturn this.model ? (clampThinkingLevel(this.model, level) as ThinkingLevel) : \"off\";\n\t}\n\n\t// =========================================================================\n\t// Queue Mode Management\n\t// =========================================================================\n\n\t/**\n\t * Set steering message mode.\n\t * Saves to settings.\n\t */\n\tsetSteeringMode(mode: \"all\" | \"one-at-a-time\"): void {\n\t\tthis.agent.steeringMode = mode;\n\t\tthis.settingsManager.setSteeringMode(mode);\n\t}\n\n\t/**\n\t * Set follow-up message mode.\n\t * Saves to settings.\n\t */\n\tsetFollowUpMode(mode: \"all\" | \"one-at-a-time\"): void {\n\t\tthis.agent.followUpMode = mode;\n\t\tthis.settingsManager.setFollowUpMode(mode);\n\t}\n\n\t// =========================================================================\n\t// Compaction\n\t// =========================================================================\n\n\t/**\n\t * Manually compact the session context.\n\t * Aborts current agent operation first.\n\t * @param customInstructions Optional instructions for the compaction summary\n\t */\n\tasync compact(customInstructions?: string): Promise<CompactionResult> {\n\t\tthis._disconnectFromAgent();\n\t\tawait this.abort();\n\t\tthis._compactionAbortController = new AbortController();\n\t\tthis._emit({ type: \"compaction_start\", reason: \"manual\" });\n\n\t\ttry {\n\t\t\tif (!this.model) {\n\t\t\t\tthrow new Error(formatNoModelSelectedMessage());\n\t\t\t}\n\n\t\t\tconst { apiKey, headers } = await this._getRequiredRequestAuth(this.model);\n\n\t\t\tconst pathEntries = this.sessionManager.getBranch();\n\t\t\tconst settings = this.settingsManager.getCompactionSettings();\n\n\t\t\tconst preparation = prepareCompaction(pathEntries, settings);\n\t\t\tif (!preparation) {\n\t\t\t\t// Check why we can't compact\n\t\t\t\tconst lastEntry = pathEntries[pathEntries.length - 1];\n\t\t\t\tif (lastEntry?.type === \"compaction\") {\n\t\t\t\t\tthrow new Error(\"Already compacted\");\n\t\t\t\t}\n\t\t\t\tthrow new Error(\"Nothing to compact (session too small)\");\n\t\t\t}\n\n\t\t\tlet extensionCompaction: CompactionResult | undefined;\n\t\t\tlet fromExtension = false;\n\n\t\t\tif (this._extensionRunner.hasHandlers(\"session_before_compact\")) {\n\t\t\t\tconst result = (await this._extensionRunner.emit({\n\t\t\t\t\ttype: \"session_before_compact\",\n\t\t\t\t\tpreparation,\n\t\t\t\t\tbranchEntries: pathEntries,\n\t\t\t\t\tcustomInstructions,\n\t\t\t\t\tsignal: this._compactionAbortController.signal,\n\t\t\t\t})) as SessionBeforeCompactResult | undefined;\n\n\t\t\t\tif (result?.cancel) {\n\t\t\t\t\tthrow new Error(\"Compaction cancelled\");\n\t\t\t\t}\n\n\t\t\t\tif (result?.compaction) {\n\t\t\t\t\textensionCompaction = result.compaction;\n\t\t\t\t\tfromExtension = true;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tlet summary: string;\n\t\t\tlet firstKeptEntryId: string;\n\t\t\tlet tokensBefore: number;\n\t\t\tlet details: unknown;\n\n\t\t\tif (extensionCompaction) {\n\t\t\t\t// Extension provided compaction content\n\t\t\t\tsummary = extensionCompaction.summary;\n\t\t\t\tfirstKeptEntryId = extensionCompaction.firstKeptEntryId;\n\t\t\t\ttokensBefore = extensionCompaction.tokensBefore;\n\t\t\t\tdetails = extensionCompaction.details;\n\t\t\t} else {\n\t\t\t\t// Generate compaction result\n\t\t\t\tconst result = await compact(\n\t\t\t\t\tpreparation,\n\t\t\t\t\tthis.model,\n\t\t\t\t\tapiKey,\n\t\t\t\t\theaders,\n\t\t\t\t\tcustomInstructions,\n\t\t\t\t\tthis._compactionAbortController.signal,\n\t\t\t\t\tthis.thinkingLevel,\n\t\t\t\t);\n\t\t\t\tsummary = result.summary;\n\t\t\t\tfirstKeptEntryId = result.firstKeptEntryId;\n\t\t\t\ttokensBefore = result.tokensBefore;\n\t\t\t\tdetails = result.details;\n\t\t\t}\n\n\t\t\tif (this._compactionAbortController.signal.aborted) {\n\t\t\t\tthrow new Error(\"Compaction cancelled\");\n\t\t\t}\n\n\t\t\tthis.sessionManager.appendCompaction(summary, firstKeptEntryId, tokensBefore, details, fromExtension);\n\t\t\tconst newEntries = this.sessionManager.getEntries();\n\t\t\tconst sessionContext = this.sessionManager.buildSessionContext();\n\t\t\tthis.agent.state.messages = sessionContext.messages;\n\n\t\t\t// Get the saved compaction entry for the extension event\n\t\t\tconst savedCompactionEntry = newEntries.find((e) => e.type === \"compaction\" && e.summary === summary) as\n\t\t\t\t| CompactionEntry\n\t\t\t\t| undefined;\n\n\t\t\tif (this._extensionRunner && savedCompactionEntry) {\n\t\t\t\tawait this._extensionRunner.emit({\n\t\t\t\t\ttype: \"session_compact\",\n\t\t\t\t\tcompactionEntry: savedCompactionEntry,\n\t\t\t\t\tfromExtension,\n\t\t\t\t});\n\t\t\t}\n\n\t\t\tconst compactionResult = {\n\t\t\t\tsummary,\n\t\t\t\tfirstKeptEntryId,\n\t\t\t\ttokensBefore,\n\t\t\t\tdetails,\n\t\t\t};\n\t\t\tthis._emit({\n\t\t\t\ttype: \"compaction_end\",\n\t\t\t\treason: \"manual\",\n\t\t\t\tresult: compactionResult,\n\t\t\t\taborted: false,\n\t\t\t\twillRetry: false,\n\t\t\t});\n\t\t\treturn compactionResult;\n\t\t} catch (error) {\n\t\t\tconst message = error instanceof Error ? error.message : String(error);\n\t\t\tconst aborted = message === \"Compaction cancelled\" || (error instanceof Error && error.name === \"AbortError\");\n\t\t\tthis._emit({\n\t\t\t\ttype: \"compaction_end\",\n\t\t\t\treason: \"manual\",\n\t\t\t\tresult: undefined,\n\t\t\t\taborted,\n\t\t\t\twillRetry: false,\n\t\t\t\terrorMessage: aborted ? undefined : `Compaction failed: ${message}`,\n\t\t\t});\n\t\t\tthrow error;\n\t\t} finally {\n\t\t\tthis._compactionAbortController = undefined;\n\t\t\tthis._reconnectToAgent();\n\t\t}\n\t}\n\n\t/**\n\t * Cancel in-progress compaction (manual or auto).\n\t */\n\tabortCompaction(): void {\n\t\tthis._compactionAbortController?.abort();\n\t\tthis._autoCompactionAbortController?.abort();\n\t}\n\n\t/**\n\t * Cancel in-progress branch summarization.\n\t */\n\tabortBranchSummary(): void {\n\t\tthis._branchSummaryAbortController?.abort();\n\t}\n\n\t/**\n\t * Check if compaction is needed and run it.\n\t * Called after agent_end and before prompt submission.\n\t *\n\t * Two cases:\n\t * 1. Overflow: LLM returned context overflow error, remove error message from agent state, compact, auto-retry\n\t * 2. Threshold: Context over threshold, compact, NO auto-retry (user continues manually)\n\t *\n\t * @param assistantMessage The assistant message to check\n\t * @param skipAbortedCheck If false, include aborted messages (for pre-prompt check). Default: true\n\t */\n\tprivate async _checkCompaction(assistantMessage: AssistantMessage, skipAbortedCheck = true): Promise<void> {\n\t\tconst settings = this.settingsManager.getCompactionSettings();\n\t\tif (!settings.enabled) return;\n\n\t\t// Skip if message was aborted (user cancelled) - unless skipAbortedCheck is false\n\t\tif (skipAbortedCheck && assistantMessage.stopReason === \"aborted\") return;\n\n\t\tconst contextWindow = this.model?.contextWindow ?? 0;\n\n\t\t// Skip overflow check if the message came from a different model.\n\t\t// This handles the case where user switched from a smaller-context model (e.g. opus)\n\t\t// to a larger-context model (e.g. codex) - the overflow error from the old model\n\t\t// shouldn't trigger compaction for the new model.\n\t\tconst sameModel =\n\t\t\tthis.model && assistantMessage.provider === this.model.provider && assistantMessage.model === this.model.id;\n\n\t\t// Skip compaction checks if this assistant message is older than the latest\n\t\t// compaction boundary. This prevents a stale pre-compaction usage/error\n\t\t// from retriggering compaction on the first prompt after compaction.\n\t\tconst compactionEntry = getLatestCompactionEntry(this.sessionManager.getBranch());\n\t\tconst assistantIsFromBeforeCompaction =\n\t\t\tcompactionEntry !== null && assistantMessage.timestamp <= new Date(compactionEntry.timestamp).getTime();\n\t\tif (assistantIsFromBeforeCompaction) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Case 1: Overflow - LLM returned context overflow error\n\t\tif (sameModel && isContextOverflow(assistantMessage, contextWindow)) {\n\t\t\tif (this._overflowRecoveryAttempted) {\n\t\t\t\tthis._emit({\n\t\t\t\t\ttype: \"compaction_end\",\n\t\t\t\t\treason: \"overflow\",\n\t\t\t\t\tresult: undefined,\n\t\t\t\t\taborted: false,\n\t\t\t\t\twillRetry: false,\n\t\t\t\t\terrorMessage:\n\t\t\t\t\t\t\"Context overflow recovery failed after one compact-and-retry attempt. Try reducing context or switching to a larger-context model.\",\n\t\t\t\t});\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tthis._overflowRecoveryAttempted = true;\n\t\t\t// Remove the error message from agent state (it IS saved to session for history,\n\t\t\t// but we don't want it in context for the retry)\n\t\t\tconst messages = this.agent.state.messages;\n\t\t\tif (messages.length > 0 && messages[messages.length - 1].role === \"assistant\") {\n\t\t\t\tthis.agent.state.messages = messages.slice(0, -1);\n\t\t\t}\n\t\t\tawait this._runAutoCompaction(\"overflow\", true);\n\t\t\treturn;\n\t\t}\n\n\t\t// Case 2: Threshold - context is getting large\n\t\t// For error messages (no usage data), estimate from last successful response.\n\t\t// This ensures sessions that hit persistent API errors (e.g. 529) can still compact.\n\t\tlet contextTokens: number;\n\t\tif (assistantMessage.stopReason === \"error\") {\n\t\t\tconst messages = this.agent.state.messages;\n\t\t\tconst estimate = estimateContextTokens(messages);\n\t\t\tif (estimate.lastUsageIndex === null) return; // No usage data at all\n\t\t\t// Verify the usage source is post-compaction. Kept pre-compaction messages\n\t\t\t// have stale usage reflecting the old (larger) context and would falsely\n\t\t\t// trigger compaction right after one just finished.\n\t\t\tconst usageMsg = messages[estimate.lastUsageIndex];\n\t\t\tif (\n\t\t\t\tcompactionEntry &&\n\t\t\t\tusageMsg.role === \"assistant\" &&\n\t\t\t\t(usageMsg as AssistantMessage).timestamp <= new Date(compactionEntry.timestamp).getTime()\n\t\t\t) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tcontextTokens = estimate.tokens;\n\t\t} else {\n\t\t\tcontextTokens = calculateContextTokens(assistantMessage.usage);\n\t\t}\n\t\tif (shouldCompact(contextTokens, contextWindow, settings)) {\n\t\t\tawait this._runAutoCompaction(\"threshold\", false);\n\t\t}\n\t}\n\n\t/**\n\t * Internal: Run auto-compaction with events.\n\t */\n\tprivate async _runAutoCompaction(reason: \"overflow\" | \"threshold\", willRetry: boolean): Promise<void> {\n\t\tconst settings = this.settingsManager.getCompactionSettings();\n\n\t\tthis._emit({ type: \"compaction_start\", reason });\n\t\tthis._autoCompactionAbortController = new AbortController();\n\n\t\ttry {\n\t\t\tif (!this.model) {\n\t\t\t\tthis._emit({\n\t\t\t\t\ttype: \"compaction_end\",\n\t\t\t\t\treason,\n\t\t\t\t\tresult: undefined,\n\t\t\t\t\taborted: false,\n\t\t\t\t\twillRetry: false,\n\t\t\t\t});\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst authResult = await this._modelRegistry.getApiKeyAndHeaders(this.model);\n\t\t\tif (!authResult.ok || !authResult.apiKey) {\n\t\t\t\tthis._emit({\n\t\t\t\t\ttype: \"compaction_end\",\n\t\t\t\t\treason,\n\t\t\t\t\tresult: undefined,\n\t\t\t\t\taborted: false,\n\t\t\t\t\twillRetry: false,\n\t\t\t\t});\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tconst { apiKey, headers } = authResult;\n\n\t\t\tconst pathEntries = this.sessionManager.getBranch();\n\n\t\t\tconst preparation = prepareCompaction(pathEntries, settings);\n\t\t\tif (!preparation) {\n\t\t\t\tthis._emit({\n\t\t\t\t\ttype: \"compaction_end\",\n\t\t\t\t\treason,\n\t\t\t\t\tresult: undefined,\n\t\t\t\t\taborted: false,\n\t\t\t\t\twillRetry: false,\n\t\t\t\t});\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tlet extensionCompaction: CompactionResult | undefined;\n\t\t\tlet fromExtension = false;\n\n\t\t\tif (this._extensionRunner.hasHandlers(\"session_before_compact\")) {\n\t\t\t\tconst extensionResult = (await this._extensionRunner.emit({\n\t\t\t\t\ttype: \"session_before_compact\",\n\t\t\t\t\tpreparation,\n\t\t\t\t\tbranchEntries: pathEntries,\n\t\t\t\t\tcustomInstructions: undefined,\n\t\t\t\t\tsignal: this._autoCompactionAbortController.signal,\n\t\t\t\t})) as SessionBeforeCompactResult | undefined;\n\n\t\t\t\tif (extensionResult?.cancel) {\n\t\t\t\t\tthis._emit({\n\t\t\t\t\t\ttype: \"compaction_end\",\n\t\t\t\t\t\treason,\n\t\t\t\t\t\tresult: undefined,\n\t\t\t\t\t\taborted: true,\n\t\t\t\t\t\twillRetry: false,\n\t\t\t\t\t});\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tif (extensionResult?.compaction) {\n\t\t\t\t\textensionCompaction = extensionResult.compaction;\n\t\t\t\t\tfromExtension = true;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tlet summary: string;\n\t\t\tlet firstKeptEntryId: string;\n\t\t\tlet tokensBefore: number;\n\t\t\tlet details: unknown;\n\n\t\t\tif (extensionCompaction) {\n\t\t\t\t// Extension provided compaction content\n\t\t\t\tsummary = extensionCompaction.summary;\n\t\t\t\tfirstKeptEntryId = extensionCompaction.firstKeptEntryId;\n\t\t\t\ttokensBefore = extensionCompaction.tokensBefore;\n\t\t\t\tdetails = extensionCompaction.details;\n\t\t\t} else {\n\t\t\t\t// Generate compaction result\n\t\t\t\tconst compactResult = await compact(\n\t\t\t\t\tpreparation,\n\t\t\t\t\tthis.model,\n\t\t\t\t\tapiKey,\n\t\t\t\t\theaders,\n\t\t\t\t\tundefined,\n\t\t\t\t\tthis._autoCompactionAbortController.signal,\n\t\t\t\t\tthis.thinkingLevel,\n\t\t\t\t);\n\t\t\t\tsummary = compactResult.summary;\n\t\t\t\tfirstKeptEntryId = compactResult.firstKeptEntryId;\n\t\t\t\ttokensBefore = compactResult.tokensBefore;\n\t\t\t\tdetails = compactResult.details;\n\t\t\t}\n\n\t\t\tif (this._autoCompactionAbortController.signal.aborted) {\n\t\t\t\tthis._emit({\n\t\t\t\t\ttype: \"compaction_end\",\n\t\t\t\t\treason,\n\t\t\t\t\tresult: undefined,\n\t\t\t\t\taborted: true,\n\t\t\t\t\twillRetry: false,\n\t\t\t\t});\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tthis.sessionManager.appendCompaction(summary, firstKeptEntryId, tokensBefore, details, fromExtension);\n\t\t\tconst newEntries = this.sessionManager.getEntries();\n\t\t\tconst sessionContext = this.sessionManager.buildSessionContext();\n\t\t\tthis.agent.state.messages = sessionContext.messages;\n\n\t\t\t// Get the saved compaction entry for the extension event\n\t\t\tconst savedCompactionEntry = newEntries.find((e) => e.type === \"compaction\" && e.summary === summary) as\n\t\t\t\t| CompactionEntry\n\t\t\t\t| undefined;\n\n\t\t\tif (this._extensionRunner && savedCompactionEntry) {\n\t\t\t\tawait this._extensionRunner.emit({\n\t\t\t\t\ttype: \"session_compact\",\n\t\t\t\t\tcompactionEntry: savedCompactionEntry,\n\t\t\t\t\tfromExtension,\n\t\t\t\t});\n\t\t\t}\n\n\t\t\tconst result: CompactionResult = {\n\t\t\t\tsummary,\n\t\t\t\tfirstKeptEntryId,\n\t\t\t\ttokensBefore,\n\t\t\t\tdetails,\n\t\t\t};\n\t\t\tthis._emit({ type: \"compaction_end\", reason, result, aborted: false, willRetry });\n\n\t\t\tif (willRetry) {\n\t\t\t\tconst messages = this.agent.state.messages;\n\t\t\t\tconst lastMsg = messages[messages.length - 1];\n\t\t\t\tif (lastMsg?.role === \"assistant\" && (lastMsg as AssistantMessage).stopReason === \"error\") {\n\t\t\t\t\tthis.agent.state.messages = messages.slice(0, -1);\n\t\t\t\t}\n\n\t\t\t\tsetTimeout(() => {\n\t\t\t\t\tthis.agent.continue().catch(() => {});\n\t\t\t\t}, 100);\n\t\t\t} else if (this.agent.hasQueuedMessages()) {\n\t\t\t\t// Auto-compaction can complete while follow-up/steering/custom messages are waiting.\n\t\t\t\t// Kick the loop so queued messages are actually delivered.\n\t\t\t\tsetTimeout(() => {\n\t\t\t\t\tthis.agent.continue().catch(() => {});\n\t\t\t\t}, 100);\n\t\t\t}\n\t\t} catch (error) {\n\t\t\tconst errorMessage = error instanceof Error ? error.message : \"compaction failed\";\n\t\t\tthis._emit({\n\t\t\t\ttype: \"compaction_end\",\n\t\t\t\treason,\n\t\t\t\tresult: undefined,\n\t\t\t\taborted: false,\n\t\t\t\twillRetry: false,\n\t\t\t\terrorMessage:\n\t\t\t\t\treason === \"overflow\"\n\t\t\t\t\t\t? `Context overflow recovery failed: ${errorMessage}`\n\t\t\t\t\t\t: `Auto-compaction failed: ${errorMessage}`,\n\t\t\t});\n\t\t} finally {\n\t\t\tthis._autoCompactionAbortController = undefined;\n\t\t}\n\t}\n\n\t/**\n\t * Toggle auto-compaction setting.\n\t */\n\tsetAutoCompactionEnabled(enabled: boolean): void {\n\t\tthis.settingsManager.setCompactionEnabled(enabled);\n\t}\n\n\t/** Whether auto-compaction is enabled */\n\tget autoCompactionEnabled(): boolean {\n\t\treturn this.settingsManager.getCompactionEnabled();\n\t}\n\n\tasync bindExtensions(bindings: ExtensionBindings): Promise<void> {\n\t\tif (bindings.uiContext !== undefined) {\n\t\t\tthis._extensionUIContext = bindings.uiContext;\n\t\t}\n\t\tif (bindings.commandContextActions !== undefined) {\n\t\t\tthis._extensionCommandContextActions = bindings.commandContextActions;\n\t\t}\n\t\tif (bindings.shutdownHandler !== undefined) {\n\t\t\tthis._extensionShutdownHandler = bindings.shutdownHandler;\n\t\t}\n\t\tif (bindings.onError !== undefined) {\n\t\t\tthis._extensionErrorListener = bindings.onError;\n\t\t}\n\n\t\tthis._applyExtensionBindings(this._extensionRunner);\n\t\tawait this._extensionRunner.emit(this._sessionStartEvent);\n\t\tawait this.extendResourcesFromExtensions(this._sessionStartEvent.reason === \"reload\" ? \"reload\" : \"startup\");\n\t}\n\n\tprivate async extendResourcesFromExtensions(reason: \"startup\" | \"reload\"): Promise<void> {\n\t\tif (!this._extensionRunner.hasHandlers(\"resources_discover\")) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst { skillPaths, promptPaths, themePaths } = await this._extensionRunner.emitResourcesDiscover(\n\t\t\tthis._cwd,\n\t\t\treason,\n\t\t);\n\n\t\tif (skillPaths.length === 0 && promptPaths.length === 0 && themePaths.length === 0) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst extensionPaths: ResourceExtensionPaths = {\n\t\t\tskillPaths: this.buildExtensionResourcePaths(skillPaths),\n\t\t\tpromptPaths: this.buildExtensionResourcePaths(promptPaths),\n\t\t\tthemePaths: this.buildExtensionResourcePaths(themePaths),\n\t\t};\n\n\t\tthis._resourceLoader.extendResources(extensionPaths);\n\t\tthis._baseSystemPrompt = this._rebuildSystemPrompt(this.getActiveToolNames());\n\t\tthis.agent.state.systemPrompt = this._baseSystemPrompt;\n\t}\n\n\tprivate buildExtensionResourcePaths(entries: Array<{ path: string; extensionPath: string }>): Array<{\n\t\tpath: string;\n\t\tmetadata: { source: string; scope: \"temporary\"; origin: \"top-level\"; baseDir?: string };\n\t}> {\n\t\treturn entries.map((entry) => {\n\t\t\tconst source = this.getExtensionSourceLabel(entry.extensionPath);\n\t\t\tconst baseDir = entry.extensionPath.startsWith(\"<\") ? undefined : dirname(entry.extensionPath);\n\t\t\treturn {\n\t\t\t\tpath: entry.path,\n\t\t\t\tmetadata: {\n\t\t\t\t\tsource,\n\t\t\t\t\tscope: \"temporary\",\n\t\t\t\t\torigin: \"top-level\",\n\t\t\t\t\tbaseDir,\n\t\t\t\t},\n\t\t\t};\n\t\t});\n\t}\n\n\tprivate getExtensionSourceLabel(extensionPath: string): string {\n\t\tif (extensionPath.startsWith(\"<\")) {\n\t\t\treturn `extension:${extensionPath.replace(/[<>]/g, \"\")}`;\n\t\t}\n\t\tconst base = basename(extensionPath);\n\t\tconst name = base.replace(/\\.(ts|js)$/, \"\");\n\t\treturn `extension:${name}`;\n\t}\n\n\tprivate _applyExtensionBindings(runner: ExtensionRunner): void {\n\t\trunner.setUIContext(this._extensionUIContext);\n\t\trunner.bindCommandContext(this._extensionCommandContextActions);\n\n\t\tthis._extensionErrorUnsubscriber?.();\n\t\tthis._extensionErrorUnsubscriber = this._extensionErrorListener\n\t\t\t? runner.onError(this._extensionErrorListener)\n\t\t\t: undefined;\n\t}\n\n\tprivate _refreshCurrentModelFromRegistry(): void {\n\t\tconst currentModel = this.model;\n\t\tif (!currentModel) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst refreshedModel = this._modelRegistry.find(currentModel.provider, currentModel.id);\n\t\tif (!refreshedModel || refreshedModel === currentModel) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.agent.state.model = refreshedModel;\n\t}\n\n\tprivate _bindExtensionCore(runner: ExtensionRunner): void {\n\t\tconst getCommands = (): SlashCommandInfo[] => {\n\t\t\tconst extensionCommands: SlashCommandInfo[] = runner.getRegisteredCommands().map((command) => ({\n\t\t\t\tname: command.invocationName,\n\t\t\t\tdescription: command.description,\n\t\t\t\tsource: \"extension\",\n\t\t\t\tsourceInfo: command.sourceInfo,\n\t\t\t}));\n\n\t\t\tconst templates: SlashCommandInfo[] = this.promptTemplates.map((template) => ({\n\t\t\t\tname: template.name,\n\t\t\t\tdescription: template.description,\n\t\t\t\tsource: \"prompt\",\n\t\t\t\tsourceInfo: template.sourceInfo,\n\t\t\t}));\n\n\t\t\tconst skills: SlashCommandInfo[] = this._resourceLoader.getSkills().skills.map((skill) => ({\n\t\t\t\tname: `skill:${skill.name}`,\n\t\t\t\tdescription: skill.description,\n\t\t\t\tsource: \"skill\",\n\t\t\t\tsourceInfo: skill.sourceInfo,\n\t\t\t}));\n\n\t\t\treturn [...extensionCommands, ...templates, ...skills];\n\t\t};\n\n\t\trunner.bindCore(\n\t\t\t{\n\t\t\t\tsendMessage: (message, options) => {\n\t\t\t\t\tthis.sendCustomMessage(message, options).catch((err) => {\n\t\t\t\t\t\trunner.emitError({\n\t\t\t\t\t\t\textensionPath: \"<runtime>\",\n\t\t\t\t\t\t\tevent: \"send_message\",\n\t\t\t\t\t\t\terror: err instanceof Error ? err.message : String(err),\n\t\t\t\t\t\t});\n\t\t\t\t\t});\n\t\t\t\t},\n\t\t\t\tsendUserMessage: (content, options) => {\n\t\t\t\t\tthis.sendUserMessage(content, options).catch((err) => {\n\t\t\t\t\t\trunner.emitError({\n\t\t\t\t\t\t\textensionPath: \"<runtime>\",\n\t\t\t\t\t\t\tevent: \"send_user_message\",\n\t\t\t\t\t\t\terror: err instanceof Error ? err.message : String(err),\n\t\t\t\t\t\t});\n\t\t\t\t\t});\n\t\t\t\t},\n\t\t\t\tappendEntry: (customType, data) => {\n\t\t\t\t\tthis.sessionManager.appendCustomEntry(customType, data);\n\t\t\t\t},\n\t\t\t\tsetSessionName: (name) => {\n\t\t\t\t\tthis.setSessionName(name);\n\t\t\t\t},\n\t\t\t\tgetSessionName: () => {\n\t\t\t\t\treturn this.sessionManager.getSessionName();\n\t\t\t\t},\n\t\t\t\tsetLabel: (entryId, label) => {\n\t\t\t\t\tthis.sessionManager.appendLabelChange(entryId, label);\n\t\t\t\t},\n\t\t\t\tgetActiveTools: () => this.getActiveToolNames(),\n\t\t\t\tgetAllTools: () => this.getAllTools(),\n\t\t\t\tsetActiveTools: (toolNames) => this.setActiveToolsByName(toolNames),\n\t\t\t\trefreshTools: () => this._refreshToolRegistry(),\n\t\t\t\tgetCommands,\n\t\t\t\tsetModel: async (model) => {\n\t\t\t\t\tif (!this.modelRegistry.hasConfiguredAuth(model)) return false;\n\t\t\t\t\tawait this.setModel(model);\n\t\t\t\t\treturn true;\n\t\t\t\t},\n\t\t\t\tgetThinkingLevel: () => this.thinkingLevel,\n\t\t\t\tsetThinkingLevel: (level) => this.setThinkingLevel(level),\n\t\t\t},\n\t\t\t{\n\t\t\t\tgetModel: () => this.model,\n\t\t\t\tisIdle: () => !this.isStreaming,\n\t\t\t\tgetSignal: () => this.agent.signal,\n\t\t\t\tabort: () => this.abort(),\n\t\t\t\thasPendingMessages: () => this.pendingMessageCount > 0,\n\t\t\t\tshutdown: () => {\n\t\t\t\t\tthis._extensionShutdownHandler?.();\n\t\t\t\t},\n\t\t\t\tgetContextUsage: () => this.getContextUsage(),\n\t\t\t\tcompact: (options) => {\n\t\t\t\t\tvoid (async () => {\n\t\t\t\t\t\ttry {\n\t\t\t\t\t\t\tconst result = await this.compact(options?.customInstructions);\n\t\t\t\t\t\t\toptions?.onComplete?.(result);\n\t\t\t\t\t\t} catch (error) {\n\t\t\t\t\t\t\tconst err = error instanceof Error ? error : new Error(String(error));\n\t\t\t\t\t\t\toptions?.onError?.(err);\n\t\t\t\t\t\t}\n\t\t\t\t\t})();\n\t\t\t\t},\n\t\t\t\tgetSystemPrompt: () => this.systemPrompt,\n\t\t\t},\n\t\t\t{\n\t\t\t\tregisterProvider: (name, config) => {\n\t\t\t\t\tthis._modelRegistry.registerProvider(name, config);\n\t\t\t\t\tthis._refreshCurrentModelFromRegistry();\n\t\t\t\t},\n\t\t\t\tunregisterProvider: (name) => {\n\t\t\t\t\tthis._modelRegistry.unregisterProvider(name);\n\t\t\t\t\tthis._refreshCurrentModelFromRegistry();\n\t\t\t\t},\n\t\t\t},\n\t\t);\n\t}\n\n\tprivate _refreshToolRegistry(options?: { activeToolNames?: string[]; includeAllExtensionTools?: boolean }): void {\n\t\tconst previousRegistryNames = new Set(this._toolRegistry.keys());\n\t\tconst previousActiveToolNames = this.getActiveToolNames();\n\t\tconst allowedToolNames = this._allowedToolNames;\n\t\tconst isAllowedTool = (name: string): boolean => !allowedToolNames || allowedToolNames.has(name);\n\n\t\tconst registeredTools = this._extensionRunner.getAllRegisteredTools();\n\t\tconst allCustomTools = [\n\t\t\t...registeredTools,\n\t\t\t...this._customTools.map((definition) => ({\n\t\t\t\tdefinition,\n\t\t\t\tsourceInfo: createSyntheticSourceInfo(`<sdk:${definition.name}>`, { source: \"sdk\" }),\n\t\t\t})),\n\t\t].filter((tool) => isAllowedTool(tool.definition.name));\n\t\tconst definitionRegistry = new Map<string, ToolDefinitionEntry>(\n\t\t\tArray.from(this._baseToolDefinitions.entries())\n\t\t\t\t.filter(([name]) => isAllowedTool(name))\n\t\t\t\t.map(([name, definition]) => [\n\t\t\t\t\tname,\n\t\t\t\t\t{\n\t\t\t\t\t\tdefinition,\n\t\t\t\t\t\tsourceInfo: createSyntheticSourceInfo(`<builtin:${name}>`, { source: \"builtin\" }),\n\t\t\t\t\t},\n\t\t\t\t]),\n\t\t);\n\t\tfor (const tool of allCustomTools) {\n\t\t\tdefinitionRegistry.set(tool.definition.name, {\n\t\t\t\tdefinition: tool.definition,\n\t\t\t\tsourceInfo: tool.sourceInfo,\n\t\t\t});\n\t\t}\n\t\tthis._toolDefinitions = definitionRegistry;\n\t\tthis._toolPromptSnippets = new Map(\n\t\t\tArray.from(definitionRegistry.values())\n\t\t\t\t.map(({ definition }) => {\n\t\t\t\t\tconst snippet = this._normalizePromptSnippet(definition.promptSnippet);\n\t\t\t\t\treturn snippet ? ([definition.name, snippet] as const) : undefined;\n\t\t\t\t})\n\t\t\t\t.filter((entry): entry is readonly [string, string] => entry !== undefined),\n\t\t);\n\t\tthis._toolPromptGuidelines = new Map(\n\t\t\tArray.from(definitionRegistry.values())\n\t\t\t\t.map(({ definition }) => {\n\t\t\t\t\tconst guidelines = this._normalizePromptGuidelines(definition.promptGuidelines);\n\t\t\t\t\treturn guidelines.length > 0 ? ([definition.name, guidelines] as const) : undefined;\n\t\t\t\t})\n\t\t\t\t.filter((entry): entry is readonly [string, string[]] => entry !== undefined),\n\t\t);\n\t\tconst runner = this._extensionRunner;\n\t\tconst wrappedExtensionTools = wrapRegisteredTools(allCustomTools, runner);\n\t\tconst wrappedBuiltInTools = wrapRegisteredTools(\n\t\t\tArray.from(this._baseToolDefinitions.values())\n\t\t\t\t.filter((definition) => isAllowedTool(definition.name))\n\t\t\t\t.map((definition) => ({\n\t\t\t\t\tdefinition,\n\t\t\t\t\tsourceInfo: createSyntheticSourceInfo(`<builtin:${definition.name}>`, { source: \"builtin\" }),\n\t\t\t\t})),\n\t\t\trunner,\n\t\t);\n\n\t\tconst toolRegistry = new Map(wrappedBuiltInTools.map((tool) => [tool.name, tool]));\n\t\tfor (const tool of wrappedExtensionTools as AgentTool[]) {\n\t\t\ttoolRegistry.set(tool.name, tool);\n\t\t}\n\t\tthis._toolRegistry = toolRegistry;\n\n\t\tconst nextActiveToolNames = (\n\t\t\toptions?.activeToolNames ? [...options.activeToolNames] : [...previousActiveToolNames]\n\t\t).filter((name) => isAllowedTool(name));\n\n\t\tif (allowedToolNames) {\n\t\t\tfor (const toolName of this._toolRegistry.keys()) {\n\t\t\t\tif (allowedToolNames.has(toolName)) {\n\t\t\t\t\tnextActiveToolNames.push(toolName);\n\t\t\t\t}\n\t\t\t}\n\t\t} else if (options?.includeAllExtensionTools) {\n\t\t\tfor (const tool of wrappedExtensionTools) {\n\t\t\t\tnextActiveToolNames.push(tool.name);\n\t\t\t}\n\t\t} else if (!options?.activeToolNames) {\n\t\t\tfor (const toolName of this._toolRegistry.keys()) {\n\t\t\t\tif (!previousRegistryNames.has(toolName)) {\n\t\t\t\t\tnextActiveToolNames.push(toolName);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tthis.setActiveToolsByName([...new Set(nextActiveToolNames)]);\n\t}\n\n\tprivate _buildRuntime(options: {\n\t\tactiveToolNames?: string[];\n\t\tflagValues?: Map<string, boolean | string>;\n\t\tincludeAllExtensionTools?: boolean;\n\t}): void {\n\t\tconst autoResizeImages = this.settingsManager.getImageAutoResize();\n\t\tconst shellCommandPrefix = this.settingsManager.getShellCommandPrefix();\n\t\tconst shellPath = this.settingsManager.getShellPath();\n\t\tconst baseToolDefinitions = this._baseToolsOverride\n\t\t\t? Object.fromEntries(\n\t\t\t\t\tObject.entries(this._baseToolsOverride).map(([name, tool]) => [\n\t\t\t\t\t\tname,\n\t\t\t\t\t\tcreateToolDefinitionFromAgentTool(tool),\n\t\t\t\t\t]),\n\t\t\t\t)\n\t\t\t: createAllToolDefinitions(this._cwd, {\n\t\t\t\t\tread: { autoResizeImages },\n\t\t\t\t\tbash: { commandPrefix: shellCommandPrefix, shellPath },\n\t\t\t\t});\n\n\t\tthis._baseToolDefinitions = new Map(\n\t\t\tObject.entries(baseToolDefinitions).map(([name, tool]) => [name, tool as ToolDefinition]),\n\t\t);\n\n\t\tconst extensionsResult = this._resourceLoader.getExtensions();\n\t\tif (options.flagValues) {\n\t\t\tfor (const [name, value] of options.flagValues) {\n\t\t\t\textensionsResult.runtime.flagValues.set(name, value);\n\t\t\t}\n\t\t}\n\n\t\tthis._extensionRunner = new ExtensionRunner(\n\t\t\textensionsResult.extensions,\n\t\t\textensionsResult.runtime,\n\t\t\tthis._cwd,\n\t\t\tthis.sessionManager,\n\t\t\tthis._modelRegistry,\n\t\t);\n\t\tif (this._extensionRunnerRef) {\n\t\t\tthis._extensionRunnerRef.current = this._extensionRunner;\n\t\t}\n\t\tthis._bindExtensionCore(this._extensionRunner);\n\t\tthis._applyExtensionBindings(this._extensionRunner);\n\n\t\tconst defaultActiveToolNames = this._baseToolsOverride\n\t\t\t? Object.keys(this._baseToolsOverride)\n\t\t\t: [\"read\", \"bash\", \"edit\", \"write\"];\n\t\tconst baseActiveToolNames = options.activeToolNames ?? defaultActiveToolNames;\n\t\tthis._refreshToolRegistry({\n\t\t\tactiveToolNames: baseActiveToolNames,\n\t\t\tincludeAllExtensionTools: options.includeAllExtensionTools,\n\t\t});\n\t}\n\n\tasync reload(): Promise<void> {\n\t\tconst previousFlagValues = this._extensionRunner.getFlagValues();\n\t\tawait emitSessionShutdownEvent(this._extensionRunner, { type: \"session_shutdown\", reason: \"reload\" });\n\t\tawait this.settingsManager.reload();\n\t\tresetApiProviders();\n\t\tawait this._resourceLoader.reload();\n\t\tthis._buildRuntime({\n\t\t\tactiveToolNames: this.getActiveToolNames(),\n\t\t\tflagValues: previousFlagValues,\n\t\t\tincludeAllExtensionTools: true,\n\t\t});\n\n\t\tconst hasBindings =\n\t\t\tthis._extensionUIContext ||\n\t\t\tthis._extensionCommandContextActions ||\n\t\t\tthis._extensionShutdownHandler ||\n\t\t\tthis._extensionErrorListener;\n\t\tif (hasBindings) {\n\t\t\tawait this._extensionRunner.emit({ type: \"session_start\", reason: \"reload\" });\n\t\t\tawait this.extendResourcesFromExtensions(\"reload\");\n\t\t}\n\t}\n\n\t// =========================================================================\n\t// Auto-Retry\n\t// =========================================================================\n\n\t/**\n\t * Check if an error is retryable (overloaded, rate limit, server errors).\n\t * Context overflow errors are NOT retryable (handled by compaction instead).\n\t */\n\tprivate _isRetryableError(message: AssistantMessage): boolean {\n\t\tif (message.stopReason !== \"error\" || !message.errorMessage) return false;\n\n\t\t// Context overflow is handled by compaction, not retry\n\t\tconst contextWindow = this.model?.contextWindow ?? 0;\n\t\tif (isContextOverflow(message, contextWindow)) return false;\n\n\t\tconst err = message.errorMessage;\n\t\t// Match: overloaded_error, provider returned error, rate limit, 429, 500, 502, 503, 504, service unavailable, network/connection errors (including connection lost), WebSocket transport closes/errors, fetch failed, request ended without sending chunks, HTTP/2 closed before response, terminated, retry delay exceeded\n\t\treturn /overloaded|provider.?returned.?error|rate.?limit|too many requests|429|500|502|503|504|service.?unavailable|server.?error|internal.?error|network.?error|connection.?error|connection.?refused|connection.?lost|websocket.?closed|websocket.?error|other side closed|fetch failed|upstream.?connect|reset before headers|socket hang up|ended without|http2 request did not get a response|timed? out|timeout|terminated|retry delay/i.test(\n\t\t\terr,\n\t\t);\n\t}\n\n\t/**\n\t * Handle retryable errors with exponential backoff.\n\t * @returns true if retry was initiated, false if max retries exceeded or disabled\n\t */\n\tprivate async _handleRetryableError(message: AssistantMessage): Promise<boolean> {\n\t\tconst settings = this.settingsManager.getRetrySettings();\n\t\tif (!settings.enabled) {\n\t\t\tthis._resolveRetry();\n\t\t\treturn false;\n\t\t}\n\n\t\t// Retry promise is created synchronously in _handleAgentEvent for agent_end.\n\t\t// Keep a defensive fallback here in case a future refactor bypasses that path.\n\t\tif (!this._retryPromise) {\n\t\t\tthis._retryPromise = new Promise((resolve) => {\n\t\t\t\tthis._retryResolve = resolve;\n\t\t\t});\n\t\t}\n\n\t\tthis._retryAttempt++;\n\n\t\tif (this._retryAttempt > settings.maxRetries) {\n\t\t\t// Max retries exceeded, emit final failure and reset\n\t\t\tthis._emit({\n\t\t\t\ttype: \"auto_retry_end\",\n\t\t\t\tsuccess: false,\n\t\t\t\tattempt: this._retryAttempt - 1,\n\t\t\t\tfinalError: message.errorMessage,\n\t\t\t});\n\t\t\tthis._retryAttempt = 0;\n\t\t\tthis._resolveRetry(); // Resolve so waitForRetry() completes\n\t\t\treturn false;\n\t\t}\n\n\t\tconst delayMs = settings.baseDelayMs * 2 ** (this._retryAttempt - 1);\n\n\t\tthis._emit({\n\t\t\ttype: \"auto_retry_start\",\n\t\t\tattempt: this._retryAttempt,\n\t\t\tmaxAttempts: settings.maxRetries,\n\t\t\tdelayMs,\n\t\t\terrorMessage: message.errorMessage || \"Unknown error\",\n\t\t});\n\n\t\t// Remove error message from agent state (keep in session for history)\n\t\tconst messages = this.agent.state.messages;\n\t\tif (messages.length > 0 && messages[messages.length - 1].role === \"assistant\") {\n\t\t\tthis.agent.state.messages = messages.slice(0, -1);\n\t\t}\n\n\t\t// Wait with exponential backoff (abortable)\n\t\tthis._retryAbortController = new AbortController();\n\t\ttry {\n\t\t\tawait sleep(delayMs, this._retryAbortController.signal);\n\t\t} catch {\n\t\t\t// Aborted during sleep - emit end event so UI can clean up\n\t\t\tconst attempt = this._retryAttempt;\n\t\t\tthis._retryAttempt = 0;\n\t\t\tthis._retryAbortController = undefined;\n\t\t\tthis._emit({\n\t\t\t\ttype: \"auto_retry_end\",\n\t\t\t\tsuccess: false,\n\t\t\t\tattempt,\n\t\t\t\tfinalError: \"Retry cancelled\",\n\t\t\t});\n\t\t\tthis._resolveRetry();\n\t\t\treturn false;\n\t\t}\n\t\tthis._retryAbortController = undefined;\n\n\t\t// Retry via continue() - use setTimeout to break out of event handler chain\n\t\tsetTimeout(() => {\n\t\t\tthis.agent.continue().catch(() => {\n\t\t\t\t// Retry failed - will be caught by next agent_end\n\t\t\t});\n\t\t}, 0);\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Cancel in-progress retry.\n\t */\n\tabortRetry(): void {\n\t\tthis._retryAbortController?.abort();\n\t\t// Note: _retryAttempt is reset in the catch block of _autoRetry\n\t\tthis._resolveRetry();\n\t}\n\n\t/**\n\t * Wait for any in-progress retry to complete.\n\t * Returns immediately if no retry is in progress.\n\t */\n\tprivate async waitForRetry(): Promise<void> {\n\t\tif (!this._retryPromise) {\n\t\t\treturn;\n\t\t}\n\n\t\tawait this._retryPromise;\n\t\tawait this.agent.waitForIdle();\n\t}\n\n\t/** Whether auto-retry is currently in progress */\n\tget isRetrying(): boolean {\n\t\treturn this._retryPromise !== undefined;\n\t}\n\n\t/** Whether auto-retry is enabled */\n\tget autoRetryEnabled(): boolean {\n\t\treturn this.settingsManager.getRetryEnabled();\n\t}\n\n\t/**\n\t * Toggle auto-retry setting.\n\t */\n\tsetAutoRetryEnabled(enabled: boolean): void {\n\t\tthis.settingsManager.setRetryEnabled(enabled);\n\t}\n\n\t// =========================================================================\n\t// Bash Execution\n\t// =========================================================================\n\n\t/**\n\t * Execute a bash command.\n\t * Adds result to agent context and session.\n\t * @param command The bash command to execute\n\t * @param onChunk Optional streaming callback for output\n\t * @param options.excludeFromContext If true, command output won't be sent to LLM (!! prefix)\n\t * @param options.operations Custom BashOperations for remote execution\n\t */\n\tasync executeBash(\n\t\tcommand: string,\n\t\tonChunk?: (chunk: string) => void,\n\t\toptions?: { excludeFromContext?: boolean; operations?: BashOperations },\n\t): Promise<BashResult> {\n\t\tthis._bashAbortController = new AbortController();\n\n\t\t// Apply command prefix if configured (e.g., \"shopt -s expand_aliases\" for alias support)\n\t\tconst prefix = this.settingsManager.getShellCommandPrefix();\n\t\tconst shellPath = this.settingsManager.getShellPath();\n\t\tconst resolvedCommand = prefix ? `${prefix}\\n${command}` : command;\n\n\t\ttry {\n\t\t\tconst result = await executeBashWithOperations(\n\t\t\t\tresolvedCommand,\n\t\t\t\tthis.sessionManager.getCwd(),\n\t\t\t\toptions?.operations ?? createLocalBashOperations({ shellPath }),\n\t\t\t\t{\n\t\t\t\t\tonChunk,\n\t\t\t\t\tsignal: this._bashAbortController.signal,\n\t\t\t\t},\n\t\t\t);\n\n\t\t\tthis.recordBashResult(command, result, options);\n\t\t\treturn result;\n\t\t} finally {\n\t\t\tthis._bashAbortController = undefined;\n\t\t}\n\t}\n\n\t/**\n\t * Record a bash execution result in session history.\n\t * Used by executeBash and by extensions that handle bash execution themselves.\n\t */\n\trecordBashResult(command: string, result: BashResult, options?: { excludeFromContext?: boolean }): void {\n\t\tconst bashMessage: BashExecutionMessage = {\n\t\t\trole: \"bashExecution\",\n\t\t\tcommand,\n\t\t\toutput: result.output,\n\t\t\texitCode: result.exitCode,\n\t\t\tcancelled: result.cancelled,\n\t\t\ttruncated: result.truncated,\n\t\t\tfullOutputPath: result.fullOutputPath,\n\t\t\ttimestamp: Date.now(),\n\t\t\texcludeFromContext: options?.excludeFromContext,\n\t\t};\n\n\t\t// If agent is streaming, defer adding to avoid breaking tool_use/tool_result ordering\n\t\tif (this.isStreaming) {\n\t\t\t// Queue for later - will be flushed on agent_end\n\t\t\tthis._pendingBashMessages.push(bashMessage);\n\t\t} else {\n\t\t\t// Add to agent state immediately\n\t\t\tthis.agent.state.messages.push(bashMessage);\n\n\t\t\t// Save to session\n\t\t\tthis.sessionManager.appendMessage(bashMessage);\n\t\t}\n\t}\n\n\t/**\n\t * Cancel running bash command.\n\t */\n\tabortBash(): void {\n\t\tthis._bashAbortController?.abort();\n\t}\n\n\t/** Whether a bash command is currently running */\n\tget isBashRunning(): boolean {\n\t\treturn this._bashAbortController !== undefined;\n\t}\n\n\t/** Whether there are pending bash messages waiting to be flushed */\n\tget hasPendingBashMessages(): boolean {\n\t\treturn this._pendingBashMessages.length > 0;\n\t}\n\n\t/**\n\t * Flush pending bash messages to agent state and session.\n\t * Called after agent turn completes to maintain proper message ordering.\n\t */\n\tprivate _flushPendingBashMessages(): void {\n\t\tif (this._pendingBashMessages.length === 0) return;\n\n\t\tfor (const bashMessage of this._pendingBashMessages) {\n\t\t\t// Add to agent state\n\t\t\tthis.agent.state.messages.push(bashMessage);\n\n\t\t\t// Save to session\n\t\t\tthis.sessionManager.appendMessage(bashMessage);\n\t\t}\n\n\t\tthis._pendingBashMessages = [];\n\t}\n\n\t// =========================================================================\n\t// Session Management\n\t// =========================================================================\n\n\t/**\n\t * Set a display name for the current session.\n\t */\n\tsetSessionName(name: string): void {\n\t\tthis.sessionManager.appendSessionInfo(name);\n\t\tthis._emit({ type: \"session_info_changed\", name: this.sessionManager.getSessionName() });\n\t}\n\n\t// =========================================================================\n\t// Tree Navigation\n\t// =========================================================================\n\n\t/**\n\t * Navigate to a different node in the session tree.\n\t * Unlike fork() which creates a new session file, this stays in the same file.\n\t *\n\t * @param targetId The entry ID to navigate to\n\t * @param options.summarize Whether user wants to summarize abandoned branch\n\t * @param options.customInstructions Custom instructions for summarizer\n\t * @param options.replaceInstructions If true, customInstructions replaces the default prompt\n\t * @param options.label Label to attach to the branch summary entry\n\t * @returns Result with editorText (if user message) and cancelled status\n\t */\n\tasync navigateTree(\n\t\ttargetId: string,\n\t\toptions: { summarize?: boolean; customInstructions?: string; replaceInstructions?: boolean; label?: string } = {},\n\t): Promise<{ editorText?: string; cancelled: boolean; aborted?: boolean; summaryEntry?: BranchSummaryEntry }> {\n\t\tconst oldLeafId = this.sessionManager.getLeafId();\n\n\t\t// No-op if already at target\n\t\tif (targetId === oldLeafId) {\n\t\t\treturn { cancelled: false };\n\t\t}\n\n\t\t// Model required for summarization\n\t\tif (options.summarize && !this.model) {\n\t\t\tthrow new Error(\"No model available for summarization\");\n\t\t}\n\n\t\tconst targetEntry = this.sessionManager.getEntry(targetId);\n\t\tif (!targetEntry) {\n\t\t\tthrow new Error(`Entry ${targetId} not found`);\n\t\t}\n\n\t\t// Collect entries to summarize (from old leaf to common ancestor)\n\t\tconst { entries: entriesToSummarize, commonAncestorId } = collectEntriesForBranchSummary(\n\t\t\tthis.sessionManager,\n\t\t\toldLeafId,\n\t\t\ttargetId,\n\t\t);\n\n\t\t// Prepare event data - mutable so extensions can override\n\t\tlet customInstructions = options.customInstructions;\n\t\tlet replaceInstructions = options.replaceInstructions;\n\t\tlet label = options.label;\n\n\t\tconst preparation: TreePreparation = {\n\t\t\ttargetId,\n\t\t\toldLeafId,\n\t\t\tcommonAncestorId,\n\t\t\tentriesToSummarize,\n\t\t\tuserWantsSummary: options.summarize ?? false,\n\t\t\tcustomInstructions,\n\t\t\treplaceInstructions,\n\t\t\tlabel,\n\t\t};\n\n\t\t// Set up abort controller for summarization\n\t\tthis._branchSummaryAbortController = new AbortController();\n\n\t\ttry {\n\t\t\tlet extensionSummary: { summary: string; details?: unknown } | undefined;\n\t\t\tlet fromExtension = false;\n\n\t\t\t// Emit session_before_tree event\n\t\t\tif (this._extensionRunner.hasHandlers(\"session_before_tree\")) {\n\t\t\t\tconst result = (await this._extensionRunner.emit({\n\t\t\t\t\ttype: \"session_before_tree\",\n\t\t\t\t\tpreparation,\n\t\t\t\t\tsignal: this._branchSummaryAbortController.signal,\n\t\t\t\t})) as SessionBeforeTreeResult | undefined;\n\n\t\t\t\tif (result?.cancel) {\n\t\t\t\t\treturn { cancelled: true };\n\t\t\t\t}\n\n\t\t\t\tif (result?.summary && options.summarize) {\n\t\t\t\t\textensionSummary = result.summary;\n\t\t\t\t\tfromExtension = true;\n\t\t\t\t}\n\n\t\t\t\t// Allow extensions to override instructions and label\n\t\t\t\tif (result?.customInstructions !== undefined) {\n\t\t\t\t\tcustomInstructions = result.customInstructions;\n\t\t\t\t}\n\t\t\t\tif (result?.replaceInstructions !== undefined) {\n\t\t\t\t\treplaceInstructions = result.replaceInstructions;\n\t\t\t\t}\n\t\t\t\tif (result?.label !== undefined) {\n\t\t\t\t\tlabel = result.label;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Run default summarizer if needed\n\t\t\tlet summaryText: string | undefined;\n\t\t\tlet summaryDetails: unknown;\n\t\t\tif (options.summarize && entriesToSummarize.length > 0 && !extensionSummary) {\n\t\t\t\tconst model = this.model!;\n\t\t\t\tconst { apiKey, headers } = await this._getRequiredRequestAuth(model);\n\t\t\t\tconst branchSummarySettings = this.settingsManager.getBranchSummarySettings();\n\t\t\t\tconst result = await generateBranchSummary(entriesToSummarize, {\n\t\t\t\t\tmodel,\n\t\t\t\t\tapiKey,\n\t\t\t\t\theaders,\n\t\t\t\t\tsignal: this._branchSummaryAbortController.signal,\n\t\t\t\t\tcustomInstructions,\n\t\t\t\t\treplaceInstructions,\n\t\t\t\t\treserveTokens: branchSummarySettings.reserveTokens,\n\t\t\t\t});\n\t\t\t\tif (result.aborted) {\n\t\t\t\t\treturn { cancelled: true, aborted: true };\n\t\t\t\t}\n\t\t\t\tif (result.error) {\n\t\t\t\t\tthrow new Error(result.error);\n\t\t\t\t}\n\t\t\t\tsummaryText = result.summary;\n\t\t\t\tsummaryDetails = {\n\t\t\t\t\treadFiles: result.readFiles || [],\n\t\t\t\t\tmodifiedFiles: result.modifiedFiles || [],\n\t\t\t\t};\n\t\t\t} else if (extensionSummary) {\n\t\t\t\tsummaryText = extensionSummary.summary;\n\t\t\t\tsummaryDetails = extensionSummary.details;\n\t\t\t}\n\n\t\t\t// Determine the new leaf position based on target type\n\t\t\tlet newLeafId: string | null;\n\t\t\tlet editorText: string | undefined;\n\n\t\t\tif (targetEntry.type === \"message\" && targetEntry.message.role === \"user\") {\n\t\t\t\t// User message: leaf = parent (null if root), text goes to editor\n\t\t\t\tnewLeafId = targetEntry.parentId;\n\t\t\t\teditorText = this._extractUserMessageText(targetEntry.message.content);\n\t\t\t} else if (targetEntry.type === \"custom_message\") {\n\t\t\t\t// Custom message: leaf = parent (null if root), text goes to editor\n\t\t\t\tnewLeafId = targetEntry.parentId;\n\t\t\t\teditorText =\n\t\t\t\t\ttypeof targetEntry.content === \"string\"\n\t\t\t\t\t\t? targetEntry.content\n\t\t\t\t\t\t: targetEntry.content\n\t\t\t\t\t\t\t\t.filter((c): c is { type: \"text\"; text: string } => c.type === \"text\")\n\t\t\t\t\t\t\t\t.map((c) => c.text)\n\t\t\t\t\t\t\t\t.join(\"\");\n\t\t\t} else {\n\t\t\t\t// Non-user message: leaf = selected node\n\t\t\t\tnewLeafId = targetId;\n\t\t\t}\n\n\t\t\t// Switch leaf (with or without summary)\n\t\t\t// Summary is attached at the navigation target position (newLeafId), not the old branch\n\t\t\tlet summaryEntry: BranchSummaryEntry | undefined;\n\t\t\tif (summaryText) {\n\t\t\t\t// Create summary at target position (can be null for root)\n\t\t\t\tconst summaryId = this.sessionManager.branchWithSummary(\n\t\t\t\t\tnewLeafId,\n\t\t\t\t\tsummaryText,\n\t\t\t\t\tsummaryDetails,\n\t\t\t\t\tfromExtension,\n\t\t\t\t);\n\t\t\t\tsummaryEntry = this.sessionManager.getEntry(summaryId) as BranchSummaryEntry;\n\n\t\t\t\t// Attach label to the summary entry\n\t\t\t\tif (label) {\n\t\t\t\t\tthis.sessionManager.appendLabelChange(summaryId, label);\n\t\t\t\t}\n\t\t\t} else if (newLeafId === null) {\n\t\t\t\t// No summary, navigating to root - reset leaf\n\t\t\t\tthis.sessionManager.resetLeaf();\n\t\t\t} else {\n\t\t\t\t// No summary, navigating to non-root\n\t\t\t\tthis.sessionManager.branch(newLeafId);\n\t\t\t}\n\n\t\t\t// Attach label to target entry when not summarizing (no summary entry to label)\n\t\t\tif (label && !summaryText) {\n\t\t\t\tthis.sessionManager.appendLabelChange(targetId, label);\n\t\t\t}\n\n\t\t\t// Update agent state\n\t\t\tconst sessionContext = this.sessionManager.buildSessionContext();\n\t\t\tthis.agent.state.messages = sessionContext.messages;\n\n\t\t\t// Emit session_tree event\n\t\t\tawait this._extensionRunner.emit({\n\t\t\t\ttype: \"session_tree\",\n\t\t\t\tnewLeafId: this.sessionManager.getLeafId(),\n\t\t\t\toldLeafId,\n\t\t\t\tsummaryEntry,\n\t\t\t\tfromExtension: summaryText ? fromExtension : undefined,\n\t\t\t});\n\n\t\t\t// Emit to custom tools\n\n\t\t\treturn { editorText, cancelled: false, summaryEntry };\n\t\t} finally {\n\t\t\tthis._branchSummaryAbortController = undefined;\n\t\t}\n\t}\n\n\t/**\n\t * Get all user messages from session for fork selector.\n\t */\n\tgetUserMessagesForForking(): Array<{ entryId: string; text: string }> {\n\t\tconst entries = this.sessionManager.getEntries();\n\t\tconst result: Array<{ entryId: string; text: string }> = [];\n\n\t\tfor (const entry of entries) {\n\t\t\tif (entry.type !== \"message\") continue;\n\t\t\tif (entry.message.role !== \"user\") continue;\n\n\t\t\tconst text = this._extractUserMessageText(entry.message.content);\n\t\t\tif (text) {\n\t\t\t\tresult.push({ entryId: entry.id, text });\n\t\t\t}\n\t\t}\n\n\t\treturn result;\n\t}\n\n\tprivate _extractUserMessageText(content: string | Array<{ type: string; text?: string }>): string {\n\t\tif (typeof content === \"string\") return content;\n\t\tif (Array.isArray(content)) {\n\t\t\treturn content\n\t\t\t\t.filter((c): c is { type: \"text\"; text: string } => c.type === \"text\")\n\t\t\t\t.map((c) => c.text)\n\t\t\t\t.join(\"\");\n\t\t}\n\t\treturn \"\";\n\t}\n\n\t/**\n\t * Get session statistics.\n\t */\n\tgetSessionStats(): SessionStats {\n\t\tconst state = this.state;\n\t\tconst userMessages = state.messages.filter((m) => m.role === \"user\").length;\n\t\tconst assistantMessages = state.messages.filter((m) => m.role === \"assistant\").length;\n\t\tconst toolResults = state.messages.filter((m) => m.role === \"toolResult\").length;\n\n\t\tlet toolCalls = 0;\n\t\tlet totalInput = 0;\n\t\tlet totalOutput = 0;\n\t\tlet totalCacheRead = 0;\n\t\tlet totalCacheWrite = 0;\n\t\tlet totalCost = 0;\n\n\t\tfor (const message of state.messages) {\n\t\t\tif (message.role === \"assistant\") {\n\t\t\t\tconst assistantMsg = message as AssistantMessage;\n\t\t\t\ttoolCalls += assistantMsg.content.filter((c) => c.type === \"toolCall\").length;\n\t\t\t\ttotalInput += assistantMsg.usage.input;\n\t\t\t\ttotalOutput += assistantMsg.usage.output;\n\t\t\t\ttotalCacheRead += assistantMsg.usage.cacheRead;\n\t\t\t\ttotalCacheWrite += assistantMsg.usage.cacheWrite;\n\t\t\t\ttotalCost += assistantMsg.usage.cost.total;\n\t\t\t}\n\t\t}\n\n\t\treturn {\n\t\t\tsessionFile: this.sessionFile,\n\t\t\tsessionId: this.sessionId,\n\t\t\tuserMessages,\n\t\t\tassistantMessages,\n\t\t\ttoolCalls,\n\t\t\ttoolResults,\n\t\t\ttotalMessages: state.messages.length,\n\t\t\ttokens: {\n\t\t\t\tinput: totalInput,\n\t\t\t\toutput: totalOutput,\n\t\t\t\tcacheRead: totalCacheRead,\n\t\t\t\tcacheWrite: totalCacheWrite,\n\t\t\t\ttotal: totalInput + totalOutput + totalCacheRead + totalCacheWrite,\n\t\t\t},\n\t\t\tcost: totalCost,\n\t\t\tcontextUsage: this.getContextUsage(),\n\t\t};\n\t}\n\n\tgetContextUsage(): ContextUsage | undefined {\n\t\tconst model = this.model;\n\t\tif (!model) return undefined;\n\n\t\tconst contextWindow = model.contextWindow ?? 0;\n\t\tif (contextWindow <= 0) return undefined;\n\n\t\t// After compaction, the last assistant usage reflects pre-compaction context size.\n\t\t// We can only trust usage from an assistant that responded after the latest compaction.\n\t\t// If no such assistant exists, context token count is unknown until the next LLM response.\n\t\tconst branchEntries = this.sessionManager.getBranch();\n\t\tconst latestCompaction = getLatestCompactionEntry(branchEntries);\n\n\t\tif (latestCompaction) {\n\t\t\t// Check if there's a valid assistant usage after the compaction boundary\n\t\t\tconst compactionIndex = branchEntries.lastIndexOf(latestCompaction);\n\t\t\tlet hasPostCompactionUsage = false;\n\t\t\tfor (let i = branchEntries.length - 1; i > compactionIndex; i--) {\n\t\t\t\tconst entry = branchEntries[i];\n\t\t\t\tif (entry.type === \"message\" && entry.message.role === \"assistant\") {\n\t\t\t\t\tconst assistant = entry.message;\n\t\t\t\t\tif (assistant.stopReason !== \"aborted\" && assistant.stopReason !== \"error\") {\n\t\t\t\t\t\tconst contextTokens = calculateContextTokens(assistant.usage);\n\t\t\t\t\t\tif (contextTokens > 0) {\n\t\t\t\t\t\t\thasPostCompactionUsage = true;\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif (!hasPostCompactionUsage) {\n\t\t\t\treturn { tokens: null, contextWindow, percent: null };\n\t\t\t}\n\t\t}\n\n\t\tconst estimate = estimateContextTokens(this.messages);\n\t\tconst percent = (estimate.tokens / contextWindow) * 100;\n\n\t\treturn {\n\t\t\ttokens: estimate.tokens,\n\t\t\tcontextWindow,\n\t\t\tpercent,\n\t\t};\n\t}\n\n\t/**\n\t * Export session to HTML.\n\t * @param outputPath Optional output path (defaults to session directory)\n\t * @returns Path to exported file\n\t */\n\tasync exportToHtml(outputPath?: string): Promise<string> {\n\t\tconst themeName = this.settingsManager.getTheme();\n\n\t\t// Create tool renderer if we have an extension runner (for custom tool HTML rendering)\n\t\tconst toolRenderer: ToolHtmlRenderer = createToolHtmlRenderer({\n\t\t\tgetToolDefinition: (name) => this.getToolDefinition(name),\n\t\t\ttheme,\n\t\t\tcwd: this.sessionManager.getCwd(),\n\t\t});\n\n\t\treturn await exportSessionToHtml(this.sessionManager, this.state, {\n\t\t\toutputPath,\n\t\t\tthemeName,\n\t\t\ttoolRenderer,\n\t\t});\n\t}\n\n\t/**\n\t * Export the current session branch to a JSONL file.\n\t * Writes the session header followed by all entries on the current branch path.\n\t * @param outputPath Target file path. If omitted, generates a timestamped file in cwd.\n\t * @returns The resolved output file path.\n\t */\n\texportToJsonl(outputPath?: string): string {\n\t\tconst filePath = resolve(outputPath ?? `session-${new Date().toISOString().replace(/[:.]/g, \"-\")}.jsonl`);\n\t\tconst dir = dirname(filePath);\n\t\tif (!existsSync(dir)) {\n\t\t\tmkdirSync(dir, { recursive: true });\n\t\t}\n\n\t\tconst header: SessionHeader = {\n\t\t\ttype: \"session\",\n\t\t\tversion: CURRENT_SESSION_VERSION,\n\t\t\tid: this.sessionManager.getSessionId(),\n\t\t\ttimestamp: new Date().toISOString(),\n\t\t\tcwd: this.sessionManager.getCwd(),\n\t\t};\n\n\t\tconst branchEntries = this.sessionManager.getBranch();\n\t\tconst lines = [JSON.stringify(header)];\n\n\t\t// Re-chain parentIds to form a linear sequence\n\t\tlet prevId: string | null = null;\n\t\tfor (const entry of branchEntries) {\n\t\t\tconst linear = { ...entry, parentId: prevId };\n\t\t\tlines.push(JSON.stringify(linear));\n\t\t\tprevId = entry.id;\n\t\t}\n\n\t\twriteFileSync(filePath, `${lines.join(\"\\n\")}\\n`);\n\t\treturn filePath;\n\t}\n\n\t// =========================================================================\n\t// Utilities\n\t// =========================================================================\n\n\t/**\n\t * Get text content of last assistant message.\n\t * Useful for /copy command.\n\t * @returns Text content, or undefined if no assistant message exists\n\t */\n\tgetLastAssistantText(): string | undefined {\n\t\tconst lastAssistant = this.messages\n\t\t\t.slice()\n\t\t\t.reverse()\n\t\t\t.find((m) => {\n\t\t\t\tif (m.role !== \"assistant\") return false;\n\t\t\t\tconst msg = m as AssistantMessage;\n\t\t\t\t// Skip aborted messages with no content\n\t\t\t\tif (msg.stopReason === \"aborted\" && msg.content.length === 0) return false;\n\t\t\t\treturn true;\n\t\t\t});\n\n\t\tif (!lastAssistant) return undefined;\n\n\t\tlet text = \"\";\n\t\tfor (const content of (lastAssistant as AssistantMessage).content) {\n\t\t\tif (content.type === \"text\") {\n\t\t\t\ttext += content.text;\n\t\t\t}\n\t\t}\n\n\t\treturn text.trim() || undefined;\n\t}\n\n\t// =========================================================================\n\t// Extension System\n\t// =========================================================================\n\n\tcreateReplacedSessionContext(): ReplacedSessionContext {\n\t\tconst context = Object.defineProperties(\n\t\t\t{},\n\t\t\tObject.getOwnPropertyDescriptors(this._extensionRunner.createCommandContext()),\n\t\t) as ReplacedSessionContext;\n\t\tcontext.sendMessage = (message, options) => this.sendCustomMessage(message, options);\n\t\tcontext.sendUserMessage = (content, options) => this.sendUserMessage(content, options);\n\t\treturn context;\n\t}\n\n\t/**\n\t * Check if extensions have handlers for a specific event type.\n\t */\n\thasExtensionHandlers(eventType: string): boolean {\n\t\treturn this._extensionRunner.hasHandlers(eventType);\n\t}\n\n\t/**\n\t * Get the extension runner (for setting UI context and error handlers).\n\t */\n\tget extensionRunner(): ExtensionRunner {\n\t\treturn this._extensionRunner;\n\t}\n}\n"]}