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* AgentSession - Core abstraction for agent lifecycle and session management.\n *\n * This class is shared between all run modes (interactive, print, rpc).\n * It encapsulates:\n * - Agent state access\n * - Event subscription with automatic session persistence\n * - Model and thinking level management\n * - Compaction (manual and auto)\n * - Bash execution\n * - Session switching and branching\n *\n * Modes use this class and add their own I/O layer on top.\n */\n\nimport { basename, dirname, sep } from \"node:path\";\nimport type {\n\tAgent,\n\tAgentEvent,\n\tAgentMessage,\n\tAgentState,\n\tAgentTool,\n\tBashExecutionMessage,\n\tCompactionResult,\n\tCustomMessage,\n\tThinkingLevel,\n} from \"@kolisachint/hoocode-agent-core\";\nimport type { AssistantMessage, ImageContent, Message, Model, TextContent } from \"@kolisachint/hoocode-ai\";\nimport {\n\tclampThinkingLevel,\n\tcleanupSessionResources,\n\tgetSupportedThinkingLevels,\n\tmodelsAreEqual,\n\tresetApiProviders,\n} from \"@kolisachint/hoocode-ai\";\nimport { theme } from \"../modes/interactive/theme/theme.js\";\nimport { loadAgentRegistry } from \"./agent-registry.js\";\nimport { CompactionController } from \"./agent-session-compaction.js\";\nimport { AutoRetryController } from \"./agent-session-retry.js\";\nimport { expandSkillCommand } from \"./agent-session-skills.js\";\nimport {\n\tcollectUserMessagesForForking,\n\tcomputeContextUsage,\n\tcomputeSessionStats,\n\texportSessionBranchToJsonl,\n\tgetLastAssistantText,\n\ttype SessionStats,\n\tsessionToMarkdown,\n\ttype TranscriptSelection,\n} from \"./agent-session-stats.js\";\nimport {\n\ttype NavigateTreeOptions,\n\ttype NavigateTreeResult,\n\tTreeNavigationController,\n} from \"./agent-session-tree-navigation.js\";\nimport { formatNoApiKeyFoundMessage, formatNoModelSelectedMessage } from \"./auth-guidance.js\";\nimport { type BashResult, executeBashWithOperations } from \"./bash-executor.js\";\nimport { DEFAULT_THINKING_LEVEL } from \"./defaults.js\";\nimport { getEmbsearchService } from \"./embsearch/embsearch-service.js\";\nimport { exportSessionToHtml, type ToolHtmlRenderer } from \"./export-html/index.js\";\nimport { createToolHtmlRenderer } from \"./export-html/tool-renderer.js\";\nimport {\n\ttype ActivatedCapability,\n\ttype ContextUsage,\n\ttype ExtensionCommandContextActions,\n\ttype ExtensionErrorListener,\n\tExtensionRunner,\n\ttype ExtensionUIContext,\n\ttype InputSource,\n\ttype MessageEndEvent,\n\ttype MessageStartEvent,\n\ttype MessageUpdateEvent,\n\ttype PluginActivationResult,\n\ttype ReplacedSessionContext,\n\ttype SessionStartEvent,\n\ttype ShutdownHandler,\n\ttype ToolDefinition,\n\ttype ToolExecutionEndEvent,\n\ttype ToolExecutionStartEvent,\n\ttype ToolExecutionUpdateEvent,\n\ttype ToolInfo,\n\ttype TurnEndEvent,\n\ttype TurnStartEvent,\n\twrapRegisteredTools,\n} from \"./extensions/index.js\";\nimport { parsePluginDir, pluginIdFromExtensionPath } from \"./extensions/plugins/index.js\";\nimport { emitSessionShutdownEvent } from \"./extensions/runner.js\";\nimport type { ModelRegistry } from \"./model-registry.js\";\nimport type { PathMetadata } from \"./package-manager.js\";\nimport { expandPromptTemplate, type PromptTemplate, tryExpandPromptTemplate } from \"./prompt-templates.js\";\nimport { clearProviderExhaustion, isProviderQuotaError, markProviderExhausted } from \"./provider-health.js\";\nimport type { ResourceExtensionPaths, ResourceLoader } from \"./resource-loader.js\";\nimport type { SessionManager } 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 { updateSubagentSkillPaths } from \"./subagent-pool-instance.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\";\nimport { updateWarmSubagentSkillPaths } from \"./warm-subagent-pool-instance.js\";\n\nexport type { ParsedSkillBlock } from \"./agent-session-skills.js\";\nexport { parseSkillBlock } from \"./agent-session-skills.js\";\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\nfunction describeActivation(\n\tpluginId: string,\n\tskills: ActivatedCapability[],\n\tcommands: ActivatedCapability[],\n\tagents: ActivatedCapability[],\n\tpendingReload: boolean,\n): string {\n\tconst parts: string[] = [];\n\tconst list = (label: string, caps: ActivatedCapability[], render: (c: ActivatedCapability) => string) => {\n\t\tif (caps.length > 0) parts.push(`${label}: ${caps.map(render).join(\", \")}`);\n\t};\n\tlist(\"skills\", skills, (c) => c.name);\n\tlist(\"commands\", commands, (c) => `/${c.name}`);\n\tlist(\"subagents\", agents, (c) => c.name);\n\tconst now = parts.length > 0 ? ` Active NOW (usable this turn) — ${parts.join(\"; \")}.` : \"\";\n\tconst later = pendingReload\n\t\t? \" This plugin also bundles executable capabilities (hooks/MCP servers); they activate automatically when the current turn ends.\"\n\t\t: \"\";\n\treturn `Plugin \"${pluginId}\" activated in the live session.${now}${later}`;\n}\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. Default: [read, bash, edit, write] */\n\tinitialActiveToolNames?: string[];\n\t/** Optional allowlist of tool names. When provided, only these tool names are exposed. */\n\tallowedToolNames?: string[];\n\t/** Optional denylist of tool names, subtracted from whatever set is otherwise enabled. */\n\tdisallowedToolNames?: string[];\n\t/**\n\t * Override base tools (useful for custom runtimes).\n\t *\n\t * These are synthesized into minimal ToolDefinitions internally so AgentSession can keep\n\t * a definition-first registry even when callers provide plain AgentTool instances.\n\t */\n\tbaseToolsOverride?: Record<string, AgentTool>;\n\t/** Mutable ref used by Agent to access the current ExtensionRunner */\n\textensionRunnerRef?: { current?: ExtensionRunner };\n\t/** Session start event metadata emitted when extensions bind to this runtime. */\n\tsessionStartEvent?: SessionStartEvent;\n}\n\nexport interface ExtensionBindings {\n\tuiContext?: ExtensionUIContext;\n\tcommandContextActions?: ExtensionCommandContextActions;\n\tshutdownHandler?: ShutdownHandler;\n\tonError?: ExtensionErrorListener;\n}\n\n/** Options for AgentSession.prompt() */\nexport interface PromptOptions {\n\t/** Whether to expand file-based prompt templates (default: true) */\n\texpandPromptTemplates?: boolean;\n\t/** Image attachments */\n\timages?: ImageContent[];\n\t/** When streaming, how to queue the message: \"steer\" (interrupt) or \"followUp\" (wait). Required if streaming. */\n\tstreamingBehavior?: \"steer\" | \"followUp\";\n\t/** Source of input for extension input event handlers. Defaults to \"interactive\". */\n\tsource?: InputSource;\n\t/** Internal hook used by RPC mode to observe prompt preflight acceptance or rejection. */\n\tpreflightResult?: (success: boolean) => void;\n}\n\n/** Result from cycleModel() */\nexport interface ModelCycleResult {\n\tmodel: Model<any>;\n\tthinkingLevel: ThinkingLevel;\n\t/** Whether cycling through scoped models (--models flag) or all available */\n\tisScoped: boolean;\n}\n\nexport type { SessionStats, TranscriptSelection } from \"./agent-session-stats.js\";\n\ninterface ToolDefinitionEntry {\n\tdefinition: ToolDefinition;\n\tsourceInfo: SourceInfo;\n}\n\n// ============================================================================\n// Constants\n// ============================================================================\n\n/** Standard thinking levels */\nconst THINKING_LEVELS: ThinkingLevel[] = [\"off\", \"minimal\", \"low\", \"medium\", \"high\"];\n\n// ============================================================================\n// AgentSession Class\n// ============================================================================\n\nexport class AgentSession {\n\treadonly agent: Agent;\n\treadonly sessionManager: SessionManager;\n\treadonly settingsManager: SettingsManager;\n\n\tprivate _scopedModels: Array<{ model: Model<any>; thinkingLevel?: ThinkingLevel }>;\n\n\t// Event subscription state\n\tprivate _unsubscribeAgent?: () => void;\n\tprivate _eventListeners: AgentSessionEventListener[] = [];\n\tprivate _agentEventQueue: Promise<void> = Promise.resolve();\n\n\t/** Tracks pending steering messages for UI display. Removed when delivered. */\n\tprivate _steeringMessages: string[] = [];\n\t/** Tracks pending follow-up messages for UI display. 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 _compaction: CompactionController;\n\n\t// Branch summarization / tree navigation\n\tprivate _tree: TreeNavigationController;\n\n\t// Retry state\n\tprivate _retry: AutoRetryController;\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 _disallowedToolNames?: 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\t/**\n\t * Set when tools or the system prompt change while a run is in flight (a tool\n\t * registered mid-turn, a plugin activated live). The agent loop snapshots its\n\t * context at run start; this flag makes prepareNextTurn hand the loop a fresh\n\t * systemPrompt + tools before the next provider request, so mid-turn\n\t * capability changes are visible within the same turn.\n\t */\n\tprivate _runtimeContextDirty = false;\n\n\t/**\n\t * Set when a change needs a full reload (executable plugin capabilities:\n\t * hooks, MCP servers, providers) that cannot be wired mid-turn. Consumed on\n\t * agent_end: once the session is idle the reload runs automatically.\n\t */\n\tprivate _reloadWhenIdle = false;\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\tupdateSubagentSkillPaths(this._resourceLoader.getSkillPaths());\n\t\tupdateWarmSubagentSkillPaths(this._resourceLoader.getSkillPaths());\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._disallowedToolNames =\n\t\t\tconfig.disallowedToolNames && config.disallowedToolNames.length > 0\n\t\t\t\t? new Set(config.disallowedToolNames)\n\t\t\t\t: undefined;\n\t\tthis._baseToolsOverride = config.baseToolsOverride;\n\t\tthis._sessionStartEvent = config.sessionStartEvent ?? { type: \"session_start\", reason: \"startup\" };\n\n\t\tthis._retry = new AutoRetryController({\n\t\t\tgetRetrySettings: () => this.settingsManager.getRetrySettings(),\n\t\t\tgetModel: () => this.model,\n\t\t\tgetAgentMessages: () => this.agent.state.messages,\n\t\t\tsetAgentMessages: (messages) => {\n\t\t\t\tthis.agent.state.messages = messages;\n\t\t\t},\n\t\t\tcontinueAgent: () => {\n\t\t\t\tthis.agent.continue().catch(() => {\n\t\t\t\t\t// Retry failed - will be caught by next agent_end\n\t\t\t\t});\n\t\t\t},\n\t\t\twaitForAgentIdle: () => this.agent.waitForIdle(),\n\t\t\temit: (event) => this._emit(event),\n\t\t});\n\n\t\tthis._compaction = new CompactionController({\n\t\t\tsessionManager: this.sessionManager,\n\t\t\tsettingsManager: this.settingsManager,\n\t\t\tmodelRegistry: this._modelRegistry,\n\t\t\tgetModel: () => this.model,\n\t\t\tgetThinkingLevel: () => this.thinkingLevel,\n\t\t\tgetExtensionRunner: () => this._extensionRunner,\n\t\t\tgetAgentMessages: () => this.agent.state.messages,\n\t\t\tsetAgentMessages: (messages) => {\n\t\t\t\tthis.agent.state.messages = messages;\n\t\t\t},\n\t\t\tgetRequiredRequestAuth: (model) => this._getRequiredRequestAuth(model),\n\t\t\temit: (event) => this._emit(event),\n\t\t\tdisconnectFromAgent: () => this._disconnectFromAgent(),\n\t\t\treconnectToAgent: () => this._reconnectToAgent(),\n\t\t\tabortSession: () => this.abort(),\n\t\t\tcontinueAgent: () => {\n\t\t\t\tthis.agent.continue().catch(() => {});\n\t\t\t},\n\t\t\thasQueuedMessages: () => this.agent.hasQueuedMessages(),\n\t\t});\n\n\t\tthis._tree = new TreeNavigationController({\n\t\t\tsessionManager: this.sessionManager,\n\t\t\tsettingsManager: this.settingsManager,\n\t\t\tgetModel: () => this.model,\n\t\t\tgetExtensionRunner: () => this._extensionRunner,\n\t\t\tgetRequiredRequestAuth: (model) => this._getRequiredRequestAuth(model),\n\t\t\tsetAgentMessages: (messages) => {\n\t\t\t\tthis.agent.state.messages = messages;\n\t\t\t},\n\t\t});\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\t// Refresh the loop's frozen context snapshot between turns whenever tools or\n\t\t// the system prompt changed mid-run (deferred MCP schema resolution, live\n\t\t// plugin activation). Keeps the loop's message history; swaps prompt + tools.\n\t\tthis.agent.prepareNextTurn = (loopContext) => {\n\t\t\tif (!this._runtimeContextDirty) return undefined;\n\t\t\tthis._runtimeContextDirty = false;\n\t\t\treturn {\n\t\t\t\tcontext: {\n\t\t\t\t\tsystemPrompt: this.agent.state.systemPrompt,\n\t\t\t\t\tmessages: loopContext.context.messages,\n\t\t\t\t\ttools: this.agent.state.tools.slice(),\n\t\t\t\t},\n\t\t\t};\n\t\t};\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\tlet content = result.content;\n\t\t\tlet details = result.details;\n\t\t\tlet resolvedIsError = isError;\n\t\t\tlet changed = false;\n\n\t\t\t// Extensions see the real (uncompressed) tool result first.\n\t\t\tif (runner.hasHandlers(\"tool_result\")) {\n\t\t\t\tconst hookResult = await runner.emitToolResult({\n\t\t\t\t\ttype: \"tool_result\",\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\tcontent: result.content,\n\t\t\t\t\tdetails: result.details,\n\t\t\t\t\tisError,\n\t\t\t\t});\n\t\t\t\tif (hookResult) {\n\t\t\t\t\tcontent = hookResult.content ?? content;\n\t\t\t\t\tdetails = hookResult.details ?? details;\n\t\t\t\t\tresolvedIsError = hookResult.isError ?? isError;\n\t\t\t\t\tchanged = true;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif (!changed) return undefined;\n\t\t\treturn { content, details, isError: resolvedIsError };\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 the retry promise 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._retry.createPromiseForAgentEnd(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 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._compaction.resetOverflowRecovery();\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._compaction.resetOverflowRecovery();\n\t\t\t\t\t// A successful response clears any prior provider-exhaustion flag so\n\t\t\t\t\t// subagent dispatch is unblocked as soon as the provider recovers.\n\t\t\t\t\tconst provider = this.model?.provider;\n\t\t\t\t\tif (provider) clearProviderExhaustion(provider);\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\") {\n\t\t\t\t\tthis._retry.onSuccessfulAssistantResponse();\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._retry.isRetryableError(msg)) {\n\t\t\t\tconst didRetry = await this._retry.handleRetryableError(msg);\n\t\t\t\tif (didRetry) return; // Retry was initiated, don't proceed to compaction\n\t\t\t\t// Retries are exhausted/disabled and a quota or rate-limit error\n\t\t\t\t// persists: flag the provider so subagent dispatch can skip pointless\n\t\t\t\t// spawns (subagents inherit this provider). Self-expires via TTL and is\n\t\t\t\t// cleared on the next successful response.\n\t\t\t\tconst provider = this.model?.provider;\n\t\t\t\tif (provider && isProviderQuotaError(msg.errorMessage)) {\n\t\t\t\t\tmarkProviderExhausted(provider, msg.errorMessage ?? \"provider error\");\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis._retry.resolve();\n\t\t\tawait this._compaction.checkCompaction(msg);\n\t\t}\n\n\t\t// A live plugin activation (or uninstall) mid-run deferred its executable\n\t\t// capabilities to a full reload; run it once the session settles. agent_end\n\t\t// fires before the run's streaming flag clears, so defer one tick and\n\t\t// re-check — if another run started meanwhile, the flag stays armed for the\n\t\t// next agent_end.\n\t\tif (event.type === \"agent_end\" && this._reloadWhenIdle) {\n\t\t\tsetTimeout(() => {\n\t\t\t\tif (this._reloadWhenIdle && !this.isStreaming && !this.isCompacting) {\n\t\t\t\t\tthis._runIdleReload();\n\t\t\t\t}\n\t\t\t}, 0);\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 extension API 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._retry.attempt;\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\t// If a run is in flight, let prepareNextTurn hand the loop this new state.\n\t\tthis._runtimeContextDirty = true;\n\t}\n\n\t/** Whether compaction or branch summarization is currently running */\n\tget isCompacting(): boolean {\n\t\treturn this._compaction.isCompacting || this._tree.isSummarizing;\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/** What to show for this session: the chosen name, else its auto-assigned slug */\n\tget displayName(): string {\n\t\treturn this.sessionManager.getDisplayName();\n\t}\n\n\t/** The session's colour slot (1-6), chosen or auto-assigned */\n\tget sessionColorSlot(): number {\n\t\treturn this.sessionManager.getSessionColorSlot();\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\t// Include agents in the system prompt only when the Task tool is active.\n\t\tconst hasTaskTool = validToolNames.includes(\"Task\");\n\t\tconst loadedAgents = hasTaskTool ? loadAgentRegistry({ cwd: this._cwd }).list() : [];\n\n\t\tthis._baseSystemPromptOptions = {\n\t\t\tcwd: this._cwd,\n\t\t\tskills: loadedSkills,\n\t\t\tagents: loadedAgents,\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 hoo.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 hoo.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\tlet expansionTemplate: PromptTemplate | undefined;\n\t\t\tlet expansionArgsString = \"\";\n\t\t\tif (expandPromptTemplates) {\n\t\t\t\texpandedText = this._expandSkillCommand(expandedText);\n\t\t\t\tconst expansion = tryExpandPromptTemplate(expandedText, [...this.promptTemplates]);\n\t\t\t\texpandedText = expansion.text;\n\t\t\t\texpansionTemplate = expansion.template;\n\t\t\t\texpansionArgsString = expansion.argsString;\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._compaction.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// For system/context slash commands, user message is the raw args if present\n\t\t\tconst userMessageText =\n\t\t\t\texpansionTemplate && expansionTemplate.type !== \"user\" && expansionArgsString.trim()\n\t\t\t\t\t? expansionArgsString\n\t\t\t\t\t: expandedText;\n\n\t\t\t// Inject context-type slash command as a custom message\n\t\t\tif (expansionTemplate?.type === \"context\") {\n\t\t\t\tmessages.push({\n\t\t\t\t\trole: \"custom\",\n\t\t\t\t\tcustomType: \"slash_command\",\n\t\t\t\t\tcontent: expandedText,\n\t\t\t\t\tdisplay: false,\n\t\t\t\t\ttimestamp: Date.now(),\n\t\t\t\t});\n\t\t\t}\n\n\t\t\t// Add user message\n\t\t\tconst userContent: (TextContent | ImageContent)[] = [{ type: \"text\", text: userMessageText }];\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\n\t\t\t// Inject system-type slash command into system prompt\n\t\t\tif (expansionTemplate?.type === \"system\") {\n\t\t\t\tconst prefix = this.agent.state.systemPrompt ? \"\\n\\n\" : \"\";\n\t\t\t\tthis.agent.state.systemPrompt += prefix + expandedText;\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._retry.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\treturn expandSkillCommand(text, this.resourceLoader.getSkills().skills, ({ filePath, error }) => {\n\t\t\tthis._extensionRunner.emitError({\n\t\t\t\textensionPath: filePath,\n\t\t\t\tevent: \"skill_expansion\",\n\t\t\t\terror,\n\t\t\t});\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._retry.abort();\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 * Step the thinking level one stop, wrapping at both ends.\n\t * @returns New level, or undefined if model doesn't support thinking\n\t */\n\tcycleThinkingLevel(direction: \"forward\" | \"backward\" = \"forward\"): 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 step = direction === \"forward\" ? 1 : -1;\n\t\tconst nextIndex = (currentIndex + step + levels.length) % 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\treturn this._compaction.compact(customInstructions);\n\t}\n\n\t/**\n\t * Cancel in-progress compaction (manual or auto).\n\t */\n\tabortCompaction(): void {\n\t\tthis._compaction.abortCompaction();\n\t}\n\n\t/**\n\t * Cancel in-progress branch summarization.\n\t */\n\tabortBranchSummary(): void {\n\t\tthis._tree.abortBranchSummary();\n\t}\n\n\t/**\n\t * Toggle auto-compaction setting.\n\t */\n\tsetAutoCompactionEnabled(enabled: boolean): void {\n\t\tthis._compaction.setAutoCompactionEnabled(enabled);\n\t}\n\n\t/** Whether auto-compaction is enabled */\n\tget autoCompactionEnabled(): boolean {\n\t\treturn this._compaction.autoCompactionEnabled;\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, slashCommandPaths, agentPaths } =\n\t\t\tawait this._extensionRunner.emitResourcesDiscover(this._cwd, reason);\n\n\t\tif (\n\t\t\tskillPaths.length === 0 &&\n\t\t\tpromptPaths.length === 0 &&\n\t\t\tthemePaths.length === 0 &&\n\t\t\tslashCommandPaths.length === 0 &&\n\t\t\tagentPaths.length === 0\n\t\t) {\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\tslashCommandPaths: this.buildExtensionResourcePaths(slashCommandPaths),\n\t\t\tagentPaths: this.buildExtensionResourcePaths(agentPaths),\n\t\t};\n\n\t\tthis._resourceLoader.extendResources(extensionPaths);\n\t\tupdateSubagentSkillPaths(this._resourceLoader.getSkillPaths());\n\t\tupdateWarmSubagentSkillPaths(this._resourceLoader.getSkillPaths());\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; namespace?: 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\t// Plugins are loaded as synthetic extensions under `<plugin:id>`\n\t\t\t\t\t// (see loadPlugins), which is where the namespace comes from.\n\t\t\t\t\tnamespace: pluginIdFromExtensionPath(entry.extensionPath),\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\tactivatePlugin: (pluginDir) => this.activatePlugin(pluginDir),\n\t\t\t\trequestReloadWhenIdle: () => this.requestReloadWhenIdle(),\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 disallowedToolNames = this._disallowedToolNames;\n\t\tconst isAllowedTool = (name: string): boolean =>\n\t\t\t(!allowedToolNames || allowedToolNames.has(name)) && !disallowedToolNames?.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 toolMaxOutputBytes = this.settingsManager.getToolOutputMaxBytes();\n\t\tconst toolMaxOutputLines = this.settingsManager.getToolOutputMaxLines();\n\t\tconst webtoolsTimeoutSecs = this.settingsManager.getWebtoolsTimeoutSecs();\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: {\n\t\t\t\t\t\tautoResizeImages,\n\t\t\t\t\t\tmaxOutputBytes: toolMaxOutputBytes,\n\t\t\t\t\t\tmaxOutputLines: toolMaxOutputLines,\n\t\t\t\t\t\tdedupReads: this.settingsManager.getContextGcEnabled(),\n\t\t\t\t\t},\n\t\t\t\t\tbash: {\n\t\t\t\t\t\tcommandPrefix: shellCommandPrefix,\n\t\t\t\t\t\tshellPath,\n\t\t\t\t\t\tmaxOutputBytes: toolMaxOutputBytes,\n\t\t\t\t\t\tmaxOutputLines: toolMaxOutputLines,\n\t\t\t\t\t},\n\t\t\t\t\tSearchCodebase: { getService: () => getEmbsearchService(this._cwd) },\n\t\t\t\t\twebfetch: { timeoutSecs: webtoolsTimeoutSecs },\n\t\t\t\t\twebsearch: { timeoutSecs: webtoolsTimeoutSecs },\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\", \"SearchCodebase\"];\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\tupdateSubagentSkillPaths(this._resourceLoader.getSkillPaths());\n\t\tupdateWarmSubagentSkillPaths(this._resourceLoader.getSkillPaths());\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// Live plugin activation (single-turn install → use)\n\t// =========================================================================\n\n\t/**\n\t * Activate a just-installed or just-authored plugin in the LIVE session, no\n\t * reload required. Passive capabilities — skills, slash commands, subagents,\n\t * themes — register immediately and become visible to the model on its next\n\t * provider request, even mid-turn (via the prepareNextTurn context refresh).\n\t *\n\t * Executable capabilities (hooks, MCP servers, providers) cannot be safely\n\t * wired into a run that is already streaming; when the plugin bundles any,\n\t * this schedules an automatic full reload for when the session next goes\n\t * idle (end of the current turn), so they still activate autonomously.\n\t */\n\tactivatePlugin(pluginDir: string): PluginActivationResult {\n\t\tconst plugin = parsePluginDir(pluginDir);\n\t\tif (!plugin) {\n\t\t\treturn { activated: false, message: `No recognizable plugin manifest at ${pluginDir}.` };\n\t\t}\n\n\t\t// Scope follows where the plugin actually lives: a project plugin sits under\n\t\t// the workspace, anything else (the global plugin dirs, a vendor drop-in) is\n\t\t// user scope. Reported verbatim in the config selector, so a hardcoded\n\t\t// \"project\" would mislabel every globally installed plugin.\n\t\tconst scope: PathMetadata[\"scope\"] =\n\t\t\tplugin.root === this._cwd || plugin.root.startsWith(`${this._cwd}${sep}`) ? \"project\" : \"user\";\n\t\tconst metadata: PathMetadata = { source: \"plugin\", scope, origin: \"top-level\", namespace: plugin.id };\n\t\tconst paths: ResourceExtensionPaths = {\n\t\t\tskillPaths: plugin.skillsDir ? [{ path: plugin.skillsDir, metadata }] : undefined,\n\t\t\tslashCommandPaths: plugin.commandsDir ? [{ path: plugin.commandsDir, metadata }] : undefined,\n\t\t\tagentPaths: plugin.agentsDir ? [{ path: plugin.agentsDir, metadata }] : undefined,\n\t\t\tthemePaths: plugin.themesDir ? [{ path: plugin.themesDir, metadata }] : undefined,\n\t\t};\n\t\tthis._resourceLoader.extendResources(paths);\n\t\tupdateSubagentSkillPaths(this._resourceLoader.getSkillPaths());\n\t\tupdateWarmSubagentSkillPaths(this._resourceLoader.getSkillPaths());\n\n\t\t// Rebuild the system prompt (skills + agent catalog are injected there) and\n\t\t// mark the run context dirty so the refresh lands before the next provider\n\t\t// request in the current run.\n\t\tthis._baseSystemPrompt = this._rebuildSystemPrompt(this.getActiveToolNames());\n\t\tthis.agent.state.systemPrompt = this._baseSystemPrompt;\n\t\tthis._runtimeContextDirty = true;\n\n\t\tconst underRoot = (filePath: string | undefined): boolean =>\n\t\t\t!!filePath && (filePath === plugin.root || filePath.startsWith(`${plugin.root}${sep}`));\n\t\tconst skills = this._resourceLoader\n\t\t\t.getSkills()\n\t\t\t.skills.filter((s) => underRoot(s.filePath))\n\t\t\t.map((s) => ({ name: s.name, description: s.description }));\n\t\tconst commands = this._resourceLoader\n\t\t\t.getPrompts()\n\t\t\t.prompts.filter((p) => underRoot(p.filePath))\n\t\t\t.map((p) => ({ name: p.name, description: p.description }));\n\t\tconst agents = loadAgentRegistry({ cwd: this._cwd })\n\t\t\t.list()\n\t\t\t.filter((a) => underRoot(a.filePath))\n\t\t\t.map((a) => ({ name: a.name, description: a.description }));\n\n\t\tconst needsReload = !!(plugin.hooks || plugin.mcpServers || (plugin.providers?.length ?? 0) > 0);\n\t\tif (needsReload) {\n\t\t\tthis._reloadWhenIdle = true;\n\t\t\tif (!this.isStreaming && !this.isCompacting) this._runIdleReload();\n\t\t}\n\n\t\treturn {\n\t\t\tactivated: true,\n\t\t\tpluginId: plugin.id,\n\t\t\tskills,\n\t\t\tcommands,\n\t\t\tagents,\n\t\t\tpendingReloadForExecutables: needsReload,\n\t\t\tmessage: describeActivation(plugin.id, skills, commands, agents, needsReload),\n\t\t};\n\t}\n\n\t/**\n\t * Ask for a full reload once the session is idle — used when a change (e.g.\n\t * uninstalling a plugin) can only take effect through the reload path. Runs\n\t * immediately when already idle.\n\t */\n\trequestReloadWhenIdle(): void {\n\t\tthis._reloadWhenIdle = true;\n\t\tif (!this.isStreaming && !this.isCompacting) this._runIdleReload();\n\t}\n\n\t/** Run the pending idle reload through the mode's reload flow when bound (UI refresh included). */\n\tprivate _runIdleReload(): void {\n\t\tif (!this._reloadWhenIdle) return;\n\t\tthis._reloadWhenIdle = false;\n\t\tconst reloadFlow = this._extensionCommandContextActions?.reload;\n\t\tvoid (async () => {\n\t\t\ttry {\n\t\t\t\tif (reloadFlow) {\n\t\t\t\t\tawait reloadFlow();\n\t\t\t\t} else {\n\t\t\t\t\tawait this.reload();\n\t\t\t\t}\n\t\t\t} catch {\n\t\t\t\t// Auto-reload is best-effort; a failed reload leaves the session usable\n\t\t\t\t// and the plugin activates on the next manual /reload or restart.\n\t\t\t}\n\t\t})();\n\t}\n\n\t// =========================================================================\n\t// Auto-Retry\n\t// =========================================================================\n\n\t/**\n\t * Cancel in-progress retry.\n\t */\n\tabortRetry(): void {\n\t\tthis._retry.abort();\n\t}\n\n\t/** Whether auto-retry is currently in progress */\n\tget isRetrying(): boolean {\n\t\treturn this._retry.isRetrying;\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 * Set the colour slot (1-6) the session's chip is filled with. Written as its\n\t * own field so it survives a later rename, and so setting it never disturbs\n\t * the name.\n\t */\n\tsetSessionColor(slot: number): void {\n\t\tthis.sessionManager.appendSessionInfo({ color: slot });\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(targetId: string, options: NavigateTreeOptions = {}): Promise<NavigateTreeResult> {\n\t\treturn this._tree.navigateTree(targetId, options);\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\treturn collectUserMessagesForForking(this.sessionManager);\n\t}\n\n\t/**\n\t * Get session statistics.\n\t */\n\tgetSessionStats(): SessionStats {\n\t\treturn computeSessionStats({\n\t\t\tmessages: this.state.messages,\n\t\t\tsessionFile: this.sessionFile,\n\t\t\tsessionId: this.sessionId,\n\t\t\tcontextUsage: this.getContextUsage(),\n\t\t});\n\t}\n\n\tgetContextUsage(): ContextUsage | undefined {\n\t\treturn computeContextUsage({\n\t\t\tmodel: this.model,\n\t\t\tsessionManager: this.sessionManager,\n\t\t\tmessages: this.messages,\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\treturn exportSessionBranchToJsonl(this.sessionManager, outputPath);\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\treturn getLastAssistantText(this.messages);\n\t}\n\n\t/**\n\t * The conversation as markdown — what was asked and what was answered.\n\t * Used by `/copy`, which offers it as text and as HTML so a paste into a\n\t * document keeps its headings, lists and tables. See `sessionToMarkdown`.\n\t */\n\tgetTranscriptMarkdown(selection?: TranscriptSelection): string {\n\t\treturn sessionToMarkdown(this.messages, selection);\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"]}