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* Extension runner - executes extensions and manages their lifecycle.\n */\n\nimport type { AgentMessage } from \"@earendil-works/pi-agent-core\";\nimport type { ImageContent, Model } from \"@earendil-works/pi-ai\";\nimport type { KeyId } from \"@earendil-works/pi-tui\";\nimport { type Theme, theme } from \"../../modes/interactive/theme/theme.js\";\nimport type { ResourceDiagnostic } from \"../diagnostics.js\";\nimport type { KeybindingsConfig } from \"../keybindings.js\";\nimport type { ModelRegistry } from \"../model-registry.js\";\nimport type { SessionManager } from \"../session-manager.js\";\nimport type { BuildSystemPromptOptions } from \"../system-prompt.js\";\nimport type {\n\tBeforeAgentStartEvent,\n\tBeforeAgentStartEventResult,\n\tBeforeProviderRequestEvent,\n\tCompactOptions,\n\tContextEvent,\n\tContextEventResult,\n\tContextUsage,\n\tExtension,\n\tExtensionActions,\n\tExtensionCommandContext,\n\tExtensionCommandContextActions,\n\tExtensionContext,\n\tExtensionContextActions,\n\tExtensionError,\n\tExtensionEvent,\n\tExtensionFlag,\n\tExtensionRuntime,\n\tExtensionShortcut,\n\tExtensionUIContext,\n\tInputEvent,\n\tInputEventResult,\n\tInputSource,\n\tMessageEndEvent,\n\tMessageEndEventResult,\n\tMessageRenderer,\n\tProviderConfig,\n\tRegisteredCommand,\n\tRegisteredTool,\n\tReplacedSessionContext,\n\tResolvedCommand,\n\tResourcesDiscoverEvent,\n\tResourcesDiscoverResult,\n\tSessionBeforeCompactResult,\n\tSessionBeforeForkResult,\n\tSessionBeforeSwitchResult,\n\tSessionBeforeTreeResult,\n\tSessionShutdownEvent,\n\tToolCallEvent,\n\tToolCallEventResult,\n\tToolResultEvent,\n\tToolResultEventResult,\n\tUserBashEvent,\n\tUserBashEventResult,\n} from \"./types.js\";\n\n// Extension shortcuts compete with canonical keybinding ids from keybindings.json.\n// Only editor-global shortcuts are reserved here. Picker-specific bindings are not.\nconst RESERVED_KEYBINDINGS_FOR_EXTENSION_CONFLICTS = [\n\t\"app.interrupt\",\n\t\"app.clear\",\n\t\"app.exit\",\n\t\"app.suspend\",\n\t\"app.thinking.cycle\",\n\t\"app.model.cycleForward\",\n\t\"app.model.cycleBackward\",\n\t\"app.model.select\",\n\t\"app.tools.expand\",\n\t\"app.thinking.toggle\",\n\t\"app.editor.external\",\n\t\"app.message.followUp\",\n\t\"tui.input.submit\",\n\t\"tui.select.confirm\",\n\t\"tui.select.cancel\",\n\t\"tui.input.copy\",\n\t\"tui.editor.deleteToLineEnd\",\n] as const;\n\ntype BuiltInKeyBindings = Partial<Record<KeyId, { keybinding: string; restrictOverride: boolean }>>;\n\nconst buildBuiltinKeybindings = (resolvedKeybindings: KeybindingsConfig): BuiltInKeyBindings => {\n\tconst builtinKeybindings = {} as BuiltInKeyBindings;\n\tfor (const [keybinding, keys] of Object.entries(resolvedKeybindings)) {\n\t\tif (keys === undefined) continue;\n\t\tconst keyList = Array.isArray(keys) ? keys : [keys];\n\t\tconst restrictOverride = (RESERVED_KEYBINDINGS_FOR_EXTENSION_CONFLICTS as readonly string[]).includes(keybinding);\n\t\tfor (const key of keyList) {\n\t\t\tconst normalizedKey = key.toLowerCase() as KeyId;\n\t\t\t// If multiple actions bind the same key, the reserved action wins so extensions\n\t\t\t// remain blocked by reserved shortcuts regardless of iteration order.\n\t\t\tconst existing = builtinKeybindings[normalizedKey];\n\t\t\tif (existing?.restrictOverride && !restrictOverride) continue;\n\t\t\tbuiltinKeybindings[normalizedKey] = {\n\t\t\t\tkeybinding,\n\t\t\t\trestrictOverride,\n\t\t\t};\n\t\t}\n\t}\n\treturn builtinKeybindings;\n};\n\n/** Combined result from all before_agent_start handlers */\ninterface BeforeAgentStartCombinedResult {\n\tmessages?: NonNullable<BeforeAgentStartEventResult[\"message\"]>[];\n\tsystemPrompt?: string;\n}\n\n/**\n * Events handled by the generic emit() method.\n * Events with dedicated emitXxx() methods are excluded for stronger type safety.\n */\ntype RunnerEmitEvent = Exclude<\n\tExtensionEvent,\n\t| ToolCallEvent\n\t| ToolResultEvent\n\t| UserBashEvent\n\t| ContextEvent\n\t| BeforeProviderRequestEvent\n\t| BeforeAgentStartEvent\n\t| MessageEndEvent\n\t| ResourcesDiscoverEvent\n\t| InputEvent\n>;\n\ntype SessionBeforeEvent = Extract<\n\tRunnerEmitEvent,\n\t{ type: \"session_before_switch\" | \"session_before_fork\" | \"session_before_compact\" | \"session_before_tree\" }\n>;\n\ntype SessionBeforeEventResult =\n\t| SessionBeforeSwitchResult\n\t| SessionBeforeForkResult\n\t| SessionBeforeCompactResult\n\t| SessionBeforeTreeResult;\n\ntype RunnerEmitResult<TEvent extends RunnerEmitEvent> = TEvent extends { type: \"session_before_switch\" }\n\t? SessionBeforeSwitchResult | undefined\n\t: TEvent extends { type: \"session_before_fork\" }\n\t\t? SessionBeforeForkResult | undefined\n\t\t: TEvent extends { type: \"session_before_compact\" }\n\t\t\t? SessionBeforeCompactResult | undefined\n\t\t\t: TEvent extends { type: \"session_before_tree\" }\n\t\t\t\t? SessionBeforeTreeResult | undefined\n\t\t\t\t: undefined;\n\nexport type ExtensionErrorListener = (error: ExtensionError) => void;\n\nexport type NewSessionHandler = (options?: {\n\tparentSession?: string;\n\tsetup?: (sessionManager: SessionManager) => Promise<void>;\n\twithSession?: (ctx: ReplacedSessionContext) => Promise<void>;\n}) => Promise<{ cancelled: boolean }>;\n\nexport type ForkHandler = (\n\tentryId: string,\n\toptions?: { position?: \"before\" | \"at\"; withSession?: (ctx: ReplacedSessionContext) => Promise<void> },\n) => Promise<{ cancelled: boolean }>;\n\nexport type NavigateTreeHandler = (\n\ttargetId: string,\n\toptions?: { summarize?: boolean; customInstructions?: string; replaceInstructions?: boolean; label?: string },\n) => Promise<{ cancelled: boolean }>;\n\nexport type SwitchSessionHandler = (\n\tsessionPath: string,\n\toptions?: { withSession?: (ctx: ReplacedSessionContext) => Promise<void> },\n) => Promise<{ cancelled: boolean }>;\n\nexport type ReloadHandler = () => Promise<void>;\n\nexport type ShutdownHandler = () => void;\n\n/**\n * Helper function to emit session_shutdown event to extensions.\n * Returns true if the event was emitted, false if there were no handlers.\n */\nexport async function emitSessionShutdownEvent(\n\textensionRunner: ExtensionRunner,\n\tevent: SessionShutdownEvent,\n): Promise<boolean> {\n\tif (extensionRunner.hasHandlers(\"session_shutdown\")) {\n\t\tawait extensionRunner.emit(event);\n\t\treturn true;\n\t}\n\treturn false;\n}\n\nconst noOpUIContext: ExtensionUIContext = {\n\tselect: async () => undefined,\n\tconfirm: async () => false,\n\tinput: async () => undefined,\n\tnotify: () => {},\n\tonTerminalInput: () => () => {},\n\tsetStatus: () => {},\n\tsetWorkingMessage: () => {},\n\tsetWorkingVisible: () => {},\n\tsetWorkingIndicator: () => {},\n\tsetHiddenThinkingLabel: () => {},\n\tsetWidget: () => {},\n\tsetFooter: () => {},\n\tsetHeader: () => {},\n\tsetTitle: () => {},\n\tcustom: async () => undefined as never,\n\tpasteToEditor: () => {},\n\tsetEditorText: () => {},\n\tgetEditorText: () => \"\",\n\teditor: async () => undefined,\n\taddAutocompleteProvider: () => {},\n\tsetEditorComponent: () => {},\n\tgetEditorComponent: () => undefined,\n\tget theme() {\n\t\treturn theme;\n\t},\n\tgetAllThemes: () => [],\n\tgetTheme: () => undefined,\n\tsetTheme: (_theme: string | Theme) => ({ success: false, error: \"UI not available\" }),\n\tgetToolsExpanded: () => false,\n\tsetToolsExpanded: () => {},\n};\n\nexport class ExtensionRunner {\n\tprivate extensions: Extension[];\n\tprivate runtime: ExtensionRuntime;\n\tprivate uiContext: ExtensionUIContext;\n\tprivate cwd: string;\n\tprivate sessionManager: SessionManager;\n\tprivate modelRegistry: ModelRegistry;\n\tprivate errorListeners: Set<ExtensionErrorListener> = new Set();\n\tprivate getModel: () => Model<any> | undefined = () => undefined;\n\tprivate isIdleFn: () => boolean = () => true;\n\tprivate getSignalFn: () => AbortSignal | undefined = () => undefined;\n\tprivate waitForIdleFn: () => Promise<void> = async () => {};\n\tprivate abortFn: () => void = () => {};\n\tprivate hasPendingMessagesFn: () => boolean = () => false;\n\tprivate getContextUsageFn: () => ContextUsage | undefined = () => undefined;\n\tprivate compactFn: (options?: CompactOptions) => void = () => {};\n\tprivate getSystemPromptFn: () => string = () => \"\";\n\tprivate newSessionHandler: NewSessionHandler = async () => ({ cancelled: false });\n\tprivate forkHandler: ForkHandler = async () => ({ cancelled: false });\n\tprivate navigateTreeHandler: NavigateTreeHandler = async () => ({ cancelled: false });\n\tprivate switchSessionHandler: SwitchSessionHandler = async () => ({ cancelled: false });\n\tprivate reloadHandler: ReloadHandler = async () => {};\n\tprivate shutdownHandler: ShutdownHandler = () => {};\n\tprivate shortcutDiagnostics: ResourceDiagnostic[] = [];\n\tprivate commandDiagnostics: ResourceDiagnostic[] = [];\n\tprivate staleMessage: string | undefined;\n\n\tconstructor(\n\t\textensions: Extension[],\n\t\truntime: ExtensionRuntime,\n\t\tcwd: string,\n\t\tsessionManager: SessionManager,\n\t\tmodelRegistry: ModelRegistry,\n\t) {\n\t\tthis.extensions = extensions;\n\t\tthis.runtime = runtime;\n\t\tthis.uiContext = noOpUIContext;\n\t\tthis.cwd = cwd;\n\t\tthis.sessionManager = sessionManager;\n\t\tthis.modelRegistry = modelRegistry;\n\t}\n\n\tbindCore(\n\t\tactions: ExtensionActions,\n\t\tcontextActions: ExtensionContextActions,\n\t\tproviderActions?: {\n\t\t\tregisterProvider?: (name: string, config: ProviderConfig) => void;\n\t\t\tunregisterProvider?: (name: string) => void;\n\t\t},\n\t): void {\n\t\t// Copy actions into the shared runtime (all extension APIs reference this)\n\t\tthis.runtime.sendMessage = actions.sendMessage;\n\t\tthis.runtime.sendUserMessage = actions.sendUserMessage;\n\t\tthis.runtime.appendEntry = actions.appendEntry;\n\t\tthis.runtime.setSessionName = actions.setSessionName;\n\t\tthis.runtime.getSessionName = actions.getSessionName;\n\t\tthis.runtime.setLabel = actions.setLabel;\n\t\tthis.runtime.getActiveTools = actions.getActiveTools;\n\t\tthis.runtime.getAllTools = actions.getAllTools;\n\t\tthis.runtime.setActiveTools = actions.setActiveTools;\n\t\tthis.runtime.refreshTools = actions.refreshTools;\n\t\tthis.runtime.getCommands = actions.getCommands;\n\t\tthis.runtime.setModel = actions.setModel;\n\t\tthis.runtime.getThinkingLevel = actions.getThinkingLevel;\n\t\tthis.runtime.setThinkingLevel = actions.setThinkingLevel;\n\n\t\t// Context actions (required)\n\t\tthis.getModel = contextActions.getModel;\n\t\tthis.isIdleFn = contextActions.isIdle;\n\t\tthis.getSignalFn = contextActions.getSignal;\n\t\tthis.abortFn = contextActions.abort;\n\t\tthis.hasPendingMessagesFn = contextActions.hasPendingMessages;\n\t\tthis.shutdownHandler = contextActions.shutdown;\n\t\tthis.getContextUsageFn = contextActions.getContextUsage;\n\t\tthis.compactFn = contextActions.compact;\n\t\tthis.getSystemPromptFn = contextActions.getSystemPrompt;\n\n\t\t// Flush provider registrations queued during extension loading\n\t\tfor (const { name, config, extensionPath } of this.runtime.pendingProviderRegistrations) {\n\t\t\ttry {\n\t\t\t\tif (providerActions?.registerProvider) {\n\t\t\t\t\tproviderActions.registerProvider(name, config);\n\t\t\t\t} else {\n\t\t\t\t\tthis.modelRegistry.registerProvider(name, config);\n\t\t\t\t}\n\t\t\t} catch (err) {\n\t\t\t\tthis.emitError({\n\t\t\t\t\textensionPath,\n\t\t\t\t\tevent: \"register_provider\",\n\t\t\t\t\terror: err instanceof Error ? err.message : String(err),\n\t\t\t\t\tstack: err instanceof Error ? err.stack : undefined,\n\t\t\t\t});\n\t\t\t}\n\t\t}\n\t\tthis.runtime.pendingProviderRegistrations = [];\n\n\t\t// From this point on, provider registration/unregistration takes effect immediately\n\t\t// without requiring a /reload.\n\t\tthis.runtime.registerProvider = (name, config) => {\n\t\t\tif (providerActions?.registerProvider) {\n\t\t\t\tproviderActions.registerProvider(name, config);\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tthis.modelRegistry.registerProvider(name, config);\n\t\t};\n\t\tthis.runtime.unregisterProvider = (name) => {\n\t\t\tif (providerActions?.unregisterProvider) {\n\t\t\t\tproviderActions.unregisterProvider(name);\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tthis.modelRegistry.unregisterProvider(name);\n\t\t};\n\t}\n\n\tbindCommandContext(actions?: ExtensionCommandContextActions): void {\n\t\tif (actions) {\n\t\t\tthis.waitForIdleFn = actions.waitForIdle;\n\t\t\tthis.newSessionHandler = actions.newSession;\n\t\t\tthis.forkHandler = actions.fork;\n\t\t\tthis.navigateTreeHandler = actions.navigateTree;\n\t\t\tthis.switchSessionHandler = actions.switchSession;\n\t\t\tthis.reloadHandler = actions.reload;\n\t\t\treturn;\n\t\t}\n\n\t\tthis.waitForIdleFn = async () => {};\n\t\tthis.newSessionHandler = async () => ({ cancelled: false });\n\t\tthis.forkHandler = async () => ({ cancelled: false });\n\t\tthis.navigateTreeHandler = async () => ({ cancelled: false });\n\t\tthis.switchSessionHandler = async () => ({ cancelled: false });\n\t\tthis.reloadHandler = async () => {};\n\t}\n\n\tsetUIContext(uiContext?: ExtensionUIContext): void {\n\t\tthis.uiContext = uiContext ?? noOpUIContext;\n\t}\n\n\tgetUIContext(): ExtensionUIContext {\n\t\treturn this.uiContext;\n\t}\n\n\thasUI(): boolean {\n\t\treturn this.uiContext !== noOpUIContext;\n\t}\n\n\tgetExtensionPaths(): string[] {\n\t\treturn this.extensions.map((e) => e.path);\n\t}\n\n\t/** Get all registered tools from all extensions (first registration per name wins). */\n\tgetAllRegisteredTools(): RegisteredTool[] {\n\t\tconst toolsByName = new Map<string, RegisteredTool>();\n\t\tfor (const ext of this.extensions) {\n\t\t\tfor (const tool of ext.tools.values()) {\n\t\t\t\tif (!toolsByName.has(tool.definition.name)) {\n\t\t\t\t\ttoolsByName.set(tool.definition.name, tool);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn Array.from(toolsByName.values());\n\t}\n\n\t/** Get a tool definition by name. Returns undefined if not found. */\n\tgetToolDefinition(toolName: string): RegisteredTool[\"definition\"] | undefined {\n\t\tfor (const ext of this.extensions) {\n\t\t\tconst tool = ext.tools.get(toolName);\n\t\t\tif (tool) {\n\t\t\t\treturn tool.definition;\n\t\t\t}\n\t\t}\n\t\treturn undefined;\n\t}\n\n\tgetFlags(): Map<string, ExtensionFlag> {\n\t\tconst allFlags = new Map<string, ExtensionFlag>();\n\t\tfor (const ext of this.extensions) {\n\t\t\tfor (const [name, flag] of ext.flags) {\n\t\t\t\tif (!allFlags.has(name)) {\n\t\t\t\t\tallFlags.set(name, flag);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn allFlags;\n\t}\n\n\tsetFlagValue(name: string, value: boolean | string): void {\n\t\tthis.runtime.flagValues.set(name, value);\n\t}\n\n\tgetFlagValues(): Map<string, boolean | string> {\n\t\treturn new Map(this.runtime.flagValues);\n\t}\n\n\tgetShortcuts(resolvedKeybindings: KeybindingsConfig): Map<KeyId, ExtensionShortcut> {\n\t\tthis.shortcutDiagnostics = [];\n\t\tconst builtinKeybindings = buildBuiltinKeybindings(resolvedKeybindings);\n\t\tconst extensionShortcuts = new Map<KeyId, ExtensionShortcut>();\n\n\t\tconst addDiagnostic = (message: string, extensionPath: string) => {\n\t\t\tthis.shortcutDiagnostics.push({ type: \"warning\", message, path: extensionPath });\n\t\t\tif (!this.hasUI()) {\n\t\t\t\tconsole.warn(message);\n\t\t\t}\n\t\t};\n\n\t\tfor (const ext of this.extensions) {\n\t\t\tfor (const [key, shortcut] of ext.shortcuts) {\n\t\t\t\tconst normalizedKey = key.toLowerCase() as KeyId;\n\n\t\t\t\tconst builtInKeybinding = builtinKeybindings[normalizedKey];\n\t\t\t\tif (builtInKeybinding?.restrictOverride === true) {\n\t\t\t\t\taddDiagnostic(\n\t\t\t\t\t\t`Extension shortcut '${key}' from ${shortcut.extensionPath} conflicts with built-in shortcut. Skipping.`,\n\t\t\t\t\t\tshortcut.extensionPath,\n\t\t\t\t\t);\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tif (builtInKeybinding?.restrictOverride === false) {\n\t\t\t\t\taddDiagnostic(\n\t\t\t\t\t\t`Extension shortcut conflict: '${key}' is built-in shortcut for ${builtInKeybinding.keybinding} and ${shortcut.extensionPath}. Using ${shortcut.extensionPath}.`,\n\t\t\t\t\t\tshortcut.extensionPath,\n\t\t\t\t\t);\n\t\t\t\t}\n\n\t\t\t\tconst existingExtensionShortcut = extensionShortcuts.get(normalizedKey);\n\t\t\t\tif (existingExtensionShortcut) {\n\t\t\t\t\taddDiagnostic(\n\t\t\t\t\t\t`Extension shortcut conflict: '${key}' registered by both ${existingExtensionShortcut.extensionPath} and ${shortcut.extensionPath}. Using ${shortcut.extensionPath}.`,\n\t\t\t\t\t\tshortcut.extensionPath,\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t\textensionShortcuts.set(normalizedKey, shortcut);\n\t\t\t}\n\t\t}\n\t\treturn extensionShortcuts;\n\t}\n\n\tgetShortcutDiagnostics(): ResourceDiagnostic[] {\n\t\treturn this.shortcutDiagnostics;\n\t}\n\n\tinvalidate(\n\t\tmessage = \"This extension ctx is stale after session replacement or reload. Do not use a captured pi or command ctx after ctx.newSession(), ctx.fork(), ctx.switchSession(), or ctx.reload(). For newSession, fork, and switchSession, move post-replacement work into withSession and use the ctx passed to withSession. For reload, do not use the old ctx after await ctx.reload().\",\n\t): void {\n\t\tif (!this.staleMessage) {\n\t\t\tthis.staleMessage = message;\n\t\t\tthis.runtime.invalidate(message);\n\t\t}\n\t}\n\n\tprivate assertActive(): void {\n\t\tif (this.staleMessage) {\n\t\t\tthrow new Error(this.staleMessage);\n\t\t}\n\t}\n\n\tonError(listener: ExtensionErrorListener): () => void {\n\t\tthis.errorListeners.add(listener);\n\t\treturn () => this.errorListeners.delete(listener);\n\t}\n\n\temitError(error: ExtensionError): void {\n\t\tfor (const listener of this.errorListeners) {\n\t\t\tlistener(error);\n\t\t}\n\t}\n\n\thasHandlers(eventType: string): boolean {\n\t\tfor (const ext of this.extensions) {\n\t\t\tconst handlers = ext.handlers.get(eventType);\n\t\t\tif (handlers && handlers.length > 0) {\n\t\t\t\treturn true;\n\t\t\t}\n\t\t}\n\t\treturn false;\n\t}\n\n\tgetMessageRenderer(customType: string): MessageRenderer | undefined {\n\t\tfor (const ext of this.extensions) {\n\t\t\tconst renderer = ext.messageRenderers.get(customType);\n\t\t\tif (renderer) {\n\t\t\t\treturn renderer;\n\t\t\t}\n\t\t}\n\t\treturn undefined;\n\t}\n\n\tprivate resolveRegisteredCommands(): ResolvedCommand[] {\n\t\tconst commands: RegisteredCommand[] = [];\n\t\tconst counts = new Map<string, number>();\n\n\t\tfor (const ext of this.extensions) {\n\t\t\tfor (const command of ext.commands.values()) {\n\t\t\t\tcommands.push(command);\n\t\t\t\tcounts.set(command.name, (counts.get(command.name) ?? 0) + 1);\n\t\t\t}\n\t\t}\n\n\t\tconst seen = new Map<string, number>();\n\t\tconst takenInvocationNames = new Set<string>();\n\n\t\treturn commands.map((command) => {\n\t\t\tconst occurrence = (seen.get(command.name) ?? 0) + 1;\n\t\t\tseen.set(command.name, occurrence);\n\n\t\t\tlet invocationName = (counts.get(command.name) ?? 0) > 1 ? `${command.name}:${occurrence}` : command.name;\n\n\t\t\tif (takenInvocationNames.has(invocationName)) {\n\t\t\t\tlet suffix = occurrence;\n\t\t\t\tdo {\n\t\t\t\t\tsuffix++;\n\t\t\t\t\tinvocationName = `${command.name}:${suffix}`;\n\t\t\t\t} while (takenInvocationNames.has(invocationName));\n\t\t\t}\n\n\t\t\ttakenInvocationNames.add(invocationName);\n\t\t\treturn {\n\t\t\t\t...command,\n\t\t\t\tinvocationName,\n\t\t\t};\n\t\t});\n\t}\n\n\tgetRegisteredCommands(): ResolvedCommand[] {\n\t\tthis.commandDiagnostics = [];\n\t\treturn this.resolveRegisteredCommands();\n\t}\n\n\tgetCommandDiagnostics(): ResourceDiagnostic[] {\n\t\treturn this.commandDiagnostics;\n\t}\n\n\tgetCommand(name: string): ResolvedCommand | undefined {\n\t\treturn this.resolveRegisteredCommands().find((command) => command.invocationName === name);\n\t}\n\n\t/**\n\t * Request a graceful shutdown. Called by extension tools and event handlers.\n\t * The actual shutdown behavior is provided by the mode via bindExtensions().\n\t */\n\tshutdown(): void {\n\t\tthis.shutdownHandler();\n\t}\n\n\t/**\n\t * Create an ExtensionContext for use in event handlers and tool execution.\n\t * Context values are resolved at call time, so changes via bindCore/bindUI are reflected.\n\t */\n\tcreateContext(): ExtensionContext {\n\t\tconst runner = this;\n\t\tconst getModel = this.getModel;\n\t\treturn {\n\t\t\tget ui() {\n\t\t\t\trunner.assertActive();\n\t\t\t\treturn runner.uiContext;\n\t\t\t},\n\t\t\tget hasUI() {\n\t\t\t\trunner.assertActive();\n\t\t\t\treturn runner.hasUI();\n\t\t\t},\n\t\t\tget cwd() {\n\t\t\t\trunner.assertActive();\n\t\t\t\treturn runner.cwd;\n\t\t\t},\n\t\t\tget sessionManager() {\n\t\t\t\trunner.assertActive();\n\t\t\t\treturn runner.sessionManager;\n\t\t\t},\n\t\t\tget modelRegistry() {\n\t\t\t\trunner.assertActive();\n\t\t\t\treturn runner.modelRegistry;\n\t\t\t},\n\t\t\tget model() {\n\t\t\t\trunner.assertActive();\n\t\t\t\treturn getModel();\n\t\t\t},\n\t\t\tisIdle: () => {\n\t\t\t\trunner.assertActive();\n\t\t\t\treturn runner.isIdleFn();\n\t\t\t},\n\t\t\tget signal() {\n\t\t\t\trunner.assertActive();\n\t\t\t\treturn runner.getSignalFn();\n\t\t\t},\n\t\t\tabort: () => {\n\t\t\t\trunner.assertActive();\n\t\t\t\trunner.abortFn();\n\t\t\t},\n\t\t\thasPendingMessages: () => {\n\t\t\t\trunner.assertActive();\n\t\t\t\treturn runner.hasPendingMessagesFn();\n\t\t\t},\n\t\t\tshutdown: () => {\n\t\t\t\trunner.assertActive();\n\t\t\t\trunner.shutdownHandler();\n\t\t\t},\n\t\t\tgetContextUsage: () => {\n\t\t\t\trunner.assertActive();\n\t\t\t\treturn runner.getContextUsageFn();\n\t\t\t},\n\t\t\tcompact: (options) => {\n\t\t\t\trunner.assertActive();\n\t\t\t\trunner.compactFn(options);\n\t\t\t},\n\t\t\tgetSystemPrompt: () => {\n\t\t\t\trunner.assertActive();\n\t\t\t\treturn runner.getSystemPromptFn();\n\t\t\t},\n\t\t};\n\t}\n\n\tcreateCommandContext(): ExtensionCommandContext {\n\t\t// Use property descriptors instead of object spread so the guarded getters from\n\t\t// createContext() stay lazy. A spread would eagerly read them once and freeze the\n\t\t// old values into the returned object, bypassing stale-instance checks.\n\t\tconst context = Object.defineProperties(\n\t\t\t{},\n\t\t\tObject.getOwnPropertyDescriptors(this.createContext()),\n\t\t) as ExtensionCommandContext;\n\t\tcontext.waitForIdle = () => {\n\t\t\tthis.assertActive();\n\t\t\treturn this.waitForIdleFn();\n\t\t};\n\t\tcontext.newSession = (options) => {\n\t\t\tthis.assertActive();\n\t\t\treturn this.newSessionHandler(options);\n\t\t};\n\t\tcontext.fork = (entryId, options) => {\n\t\t\tthis.assertActive();\n\t\t\treturn this.forkHandler(entryId, options);\n\t\t};\n\t\tcontext.navigateTree = (targetId, options) => {\n\t\t\tthis.assertActive();\n\t\t\treturn this.navigateTreeHandler(targetId, options);\n\t\t};\n\t\tcontext.switchSession = (sessionPath, options) => {\n\t\t\tthis.assertActive();\n\t\t\treturn this.switchSessionHandler(sessionPath, options);\n\t\t};\n\t\tcontext.reload = () => {\n\t\t\tthis.assertActive();\n\t\t\treturn this.reloadHandler();\n\t\t};\n\t\treturn context;\n\t}\n\n\tprivate isSessionBeforeEvent(event: RunnerEmitEvent): event is SessionBeforeEvent {\n\t\treturn (\n\t\t\tevent.type === \"session_before_switch\" ||\n\t\t\tevent.type === \"session_before_fork\" ||\n\t\t\tevent.type === \"session_before_compact\" ||\n\t\t\tevent.type === \"session_before_tree\"\n\t\t);\n\t}\n\n\tasync emit<TEvent extends RunnerEmitEvent>(event: TEvent): Promise<RunnerEmitResult<TEvent>> {\n\t\tconst ctx = this.createContext();\n\t\tlet result: SessionBeforeEventResult | undefined;\n\n\t\tfor (const ext of this.extensions) {\n\t\t\tconst handlers = ext.handlers.get(event.type);\n\t\t\tif (!handlers || handlers.length === 0) continue;\n\n\t\t\tfor (const handler of handlers) {\n\t\t\t\ttry {\n\t\t\t\t\tconst handlerResult = await handler(event, ctx);\n\n\t\t\t\t\tif (this.isSessionBeforeEvent(event) && handlerResult) {\n\t\t\t\t\t\tresult = handlerResult as SessionBeforeEventResult;\n\t\t\t\t\t\tif (result.cancel) {\n\t\t\t\t\t\t\treturn result as RunnerEmitResult<TEvent>;\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t} catch (err) {\n\t\t\t\t\tconst message = err instanceof Error ? err.message : String(err);\n\t\t\t\t\tconst stack = err instanceof Error ? err.stack : undefined;\n\t\t\t\t\tthis.emitError({\n\t\t\t\t\t\textensionPath: ext.path,\n\t\t\t\t\t\tevent: event.type,\n\t\t\t\t\t\terror: message,\n\t\t\t\t\t\tstack,\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn result as RunnerEmitResult<TEvent>;\n\t}\n\n\tasync emitMessageEnd(event: MessageEndEvent): Promise<AgentMessage | undefined> {\n\t\tconst ctx = this.createContext();\n\t\tlet currentMessage = event.message;\n\t\tlet modified = false;\n\n\t\tfor (const ext of this.extensions) {\n\t\t\tconst handlers = ext.handlers.get(\"message_end\");\n\t\t\tif (!handlers || handlers.length === 0) continue;\n\n\t\t\tfor (const handler of handlers) {\n\t\t\t\ttry {\n\t\t\t\t\tconst currentEvent: MessageEndEvent = { ...event, message: currentMessage };\n\t\t\t\t\tconst handlerResult = (await handler(currentEvent, ctx)) as MessageEndEventResult | undefined;\n\t\t\t\t\tif (!handlerResult?.message) continue;\n\n\t\t\t\t\tif (handlerResult.message.role !== currentMessage.role) {\n\t\t\t\t\t\tthis.emitError({\n\t\t\t\t\t\t\textensionPath: ext.path,\n\t\t\t\t\t\t\tevent: \"message_end\",\n\t\t\t\t\t\t\terror: \"message_end handlers must return a message with the same role\",\n\t\t\t\t\t\t});\n\t\t\t\t\t\tcontinue;\n\t\t\t\t\t}\n\n\t\t\t\t\tcurrentMessage = handlerResult.message;\n\t\t\t\t\tmodified = true;\n\t\t\t\t} catch (err) {\n\t\t\t\t\tconst message = err instanceof Error ? err.message : String(err);\n\t\t\t\t\tconst stack = err instanceof Error ? err.stack : undefined;\n\t\t\t\t\tthis.emitError({\n\t\t\t\t\t\textensionPath: ext.path,\n\t\t\t\t\t\tevent: \"message_end\",\n\t\t\t\t\t\terror: message,\n\t\t\t\t\t\tstack,\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn modified ? currentMessage : undefined;\n\t}\n\n\tasync emitToolResult(event: ToolResultEvent): Promise<ToolResultEventResult | undefined> {\n\t\tconst ctx = this.createContext();\n\t\tconst currentEvent: ToolResultEvent = { ...event };\n\t\tlet modified = false;\n\n\t\tfor (const ext of this.extensions) {\n\t\t\tconst handlers = ext.handlers.get(\"tool_result\");\n\t\t\tif (!handlers || handlers.length === 0) continue;\n\n\t\t\tfor (const handler of handlers) {\n\t\t\t\ttry {\n\t\t\t\t\tconst handlerResult = (await handler(currentEvent, ctx)) as ToolResultEventResult | undefined;\n\t\t\t\t\tif (!handlerResult) continue;\n\n\t\t\t\t\tif (handlerResult.content !== undefined) {\n\t\t\t\t\t\tcurrentEvent.content = handlerResult.content;\n\t\t\t\t\t\tmodified = true;\n\t\t\t\t\t}\n\t\t\t\t\tif (handlerResult.details !== undefined) {\n\t\t\t\t\t\tcurrentEvent.details = handlerResult.details;\n\t\t\t\t\t\tmodified = true;\n\t\t\t\t\t}\n\t\t\t\t\tif (handlerResult.isError !== undefined) {\n\t\t\t\t\t\tcurrentEvent.isError = handlerResult.isError;\n\t\t\t\t\t\tmodified = true;\n\t\t\t\t\t}\n\t\t\t\t} catch (err) {\n\t\t\t\t\tconst message = err instanceof Error ? err.message : String(err);\n\t\t\t\t\tconst stack = err instanceof Error ? err.stack : undefined;\n\t\t\t\t\tthis.emitError({\n\t\t\t\t\t\textensionPath: ext.path,\n\t\t\t\t\t\tevent: \"tool_result\",\n\t\t\t\t\t\terror: message,\n\t\t\t\t\t\tstack,\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif (!modified) {\n\t\t\treturn undefined;\n\t\t}\n\n\t\treturn {\n\t\t\tcontent: currentEvent.content,\n\t\t\tdetails: currentEvent.details,\n\t\t\tisError: currentEvent.isError,\n\t\t};\n\t}\n\n\tasync emitToolCall(event: ToolCallEvent): Promise<ToolCallEventResult | undefined> {\n\t\tconst ctx = this.createContext();\n\t\tlet result: ToolCallEventResult | undefined;\n\n\t\tfor (const ext of this.extensions) {\n\t\t\tconst handlers = ext.handlers.get(\"tool_call\");\n\t\t\tif (!handlers || handlers.length === 0) continue;\n\n\t\t\tfor (const handler of handlers) {\n\t\t\t\tconst handlerResult = await handler(event, ctx);\n\n\t\t\t\tif (handlerResult) {\n\t\t\t\t\tresult = handlerResult as ToolCallEventResult;\n\t\t\t\t\tif (result.block) {\n\t\t\t\t\t\treturn result;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn result;\n\t}\n\n\tasync emitUserBash(event: UserBashEvent): Promise<UserBashEventResult | undefined> {\n\t\tconst ctx = this.createContext();\n\n\t\tfor (const ext of this.extensions) {\n\t\t\tconst handlers = ext.handlers.get(\"user_bash\");\n\t\t\tif (!handlers || handlers.length === 0) continue;\n\n\t\t\tfor (const handler of handlers) {\n\t\t\t\ttry {\n\t\t\t\t\tconst handlerResult = await handler(event, ctx);\n\t\t\t\t\tif (handlerResult) {\n\t\t\t\t\t\treturn handlerResult as UserBashEventResult;\n\t\t\t\t\t}\n\t\t\t\t} catch (err) {\n\t\t\t\t\tconst message = err instanceof Error ? err.message : String(err);\n\t\t\t\t\tconst stack = err instanceof Error ? err.stack : undefined;\n\t\t\t\t\tthis.emitError({\n\t\t\t\t\t\textensionPath: ext.path,\n\t\t\t\t\t\tevent: \"user_bash\",\n\t\t\t\t\t\terror: message,\n\t\t\t\t\t\tstack,\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn undefined;\n\t}\n\n\tasync emitContext(messages: AgentMessage[]): Promise<AgentMessage[]> {\n\t\tconst ctx = this.createContext();\n\t\tlet currentMessages = structuredClone(messages);\n\n\t\tfor (const ext of this.extensions) {\n\t\t\tconst handlers = ext.handlers.get(\"context\");\n\t\t\tif (!handlers || handlers.length === 0) continue;\n\n\t\t\tfor (const handler of handlers) {\n\t\t\t\ttry {\n\t\t\t\t\tconst event: ContextEvent = { type: \"context\", messages: currentMessages };\n\t\t\t\t\tconst handlerResult = await handler(event, ctx);\n\n\t\t\t\t\tif (handlerResult && (handlerResult as ContextEventResult).messages) {\n\t\t\t\t\t\tcurrentMessages = (handlerResult as ContextEventResult).messages!;\n\t\t\t\t\t}\n\t\t\t\t} catch (err) {\n\t\t\t\t\tconst message = err instanceof Error ? err.message : String(err);\n\t\t\t\t\tconst stack = err instanceof Error ? err.stack : undefined;\n\t\t\t\t\tthis.emitError({\n\t\t\t\t\t\textensionPath: ext.path,\n\t\t\t\t\t\tevent: \"context\",\n\t\t\t\t\t\terror: message,\n\t\t\t\t\t\tstack,\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn currentMessages;\n\t}\n\n\tasync emitBeforeProviderRequest(payload: unknown): Promise<unknown> {\n\t\tconst ctx = this.createContext();\n\t\tlet currentPayload = payload;\n\n\t\tfor (const ext of this.extensions) {\n\t\t\tconst handlers = ext.handlers.get(\"before_provider_request\");\n\t\t\tif (!handlers || handlers.length === 0) continue;\n\n\t\t\tfor (const handler of handlers) {\n\t\t\t\ttry {\n\t\t\t\t\tconst event: BeforeProviderRequestEvent = {\n\t\t\t\t\t\ttype: \"before_provider_request\",\n\t\t\t\t\t\tpayload: currentPayload,\n\t\t\t\t\t};\n\t\t\t\t\tconst handlerResult = await handler(event, ctx);\n\t\t\t\t\tif (handlerResult !== undefined) {\n\t\t\t\t\t\tcurrentPayload = handlerResult;\n\t\t\t\t\t}\n\t\t\t\t} catch (err) {\n\t\t\t\t\tconst message = err instanceof Error ? err.message : String(err);\n\t\t\t\t\tconst stack = err instanceof Error ? err.stack : undefined;\n\t\t\t\t\tthis.emitError({\n\t\t\t\t\t\textensionPath: ext.path,\n\t\t\t\t\t\tevent: \"before_provider_request\",\n\t\t\t\t\t\terror: message,\n\t\t\t\t\t\tstack,\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn currentPayload;\n\t}\n\n\tasync emitBeforeAgentStart(\n\t\tprompt: string,\n\t\timages: ImageContent[] | undefined,\n\t\tsystemPrompt: string,\n\t\tsystemPromptOptions: BuildSystemPromptOptions,\n\t): Promise<BeforeAgentStartCombinedResult | undefined> {\n\t\tlet currentSystemPrompt = systemPrompt;\n\t\tconst ctx = Object.defineProperties(\n\t\t\t{},\n\t\t\tObject.getOwnPropertyDescriptors(this.createContext()),\n\t\t) as ExtensionContext;\n\t\tctx.getSystemPrompt = () => {\n\t\t\tthis.assertActive();\n\t\t\treturn currentSystemPrompt;\n\t\t};\n\t\tconst messages: NonNullable<BeforeAgentStartEventResult[\"message\"]>[] = [];\n\t\tlet systemPromptModified = false;\n\n\t\tfor (const ext of this.extensions) {\n\t\t\tconst handlers = ext.handlers.get(\"before_agent_start\");\n\t\t\tif (!handlers || handlers.length === 0) continue;\n\n\t\t\tfor (const handler of handlers) {\n\t\t\t\ttry {\n\t\t\t\t\tconst event: BeforeAgentStartEvent = {\n\t\t\t\t\t\ttype: \"before_agent_start\",\n\t\t\t\t\t\tprompt,\n\t\t\t\t\t\timages,\n\t\t\t\t\t\tsystemPrompt: currentSystemPrompt,\n\t\t\t\t\t\tsystemPromptOptions,\n\t\t\t\t\t};\n\t\t\t\t\tconst handlerResult = await handler(event, ctx);\n\n\t\t\t\t\tif (handlerResult) {\n\t\t\t\t\t\tconst result = handlerResult as BeforeAgentStartEventResult;\n\t\t\t\t\t\tif (result.message) {\n\t\t\t\t\t\t\tmessages.push(result.message);\n\t\t\t\t\t\t}\n\t\t\t\t\t\tif (result.systemPrompt !== undefined) {\n\t\t\t\t\t\t\tcurrentSystemPrompt = result.systemPrompt;\n\t\t\t\t\t\t\tsystemPromptModified = true;\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t} catch (err) {\n\t\t\t\t\tconst message = err instanceof Error ? err.message : String(err);\n\t\t\t\t\tconst stack = err instanceof Error ? err.stack : undefined;\n\t\t\t\t\tthis.emitError({\n\t\t\t\t\t\textensionPath: ext.path,\n\t\t\t\t\t\tevent: \"before_agent_start\",\n\t\t\t\t\t\terror: message,\n\t\t\t\t\t\tstack,\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif (messages.length > 0 || systemPromptModified) {\n\t\t\treturn {\n\t\t\t\tmessages: messages.length > 0 ? messages : undefined,\n\t\t\t\tsystemPrompt: systemPromptModified ? currentSystemPrompt : undefined,\n\t\t\t};\n\t\t}\n\n\t\treturn undefined;\n\t}\n\n\tasync emitResourcesDiscover(\n\t\tcwd: string,\n\t\treason: ResourcesDiscoverEvent[\"reason\"],\n\t): Promise<{\n\t\tskillPaths: Array<{ path: string; extensionPath: string }>;\n\t\tpromptPaths: Array<{ path: string; extensionPath: string }>;\n\t\tthemePaths: Array<{ path: string; extensionPath: string }>;\n\t}> {\n\t\tconst ctx = this.createContext();\n\t\tconst skillPaths: Array<{ path: string; extensionPath: string }> = [];\n\t\tconst promptPaths: Array<{ path: string; extensionPath: string }> = [];\n\t\tconst themePaths: Array<{ path: string; extensionPath: string }> = [];\n\n\t\tfor (const ext of this.extensions) {\n\t\t\tconst handlers = ext.handlers.get(\"resources_discover\");\n\t\t\tif (!handlers || handlers.length === 0) continue;\n\n\t\t\tfor (const handler of handlers) {\n\t\t\t\ttry {\n\t\t\t\t\tconst event: ResourcesDiscoverEvent = { type: \"resources_discover\", cwd, reason };\n\t\t\t\t\tconst handlerResult = await handler(event, ctx);\n\t\t\t\t\tconst result = handlerResult as ResourcesDiscoverResult | undefined;\n\n\t\t\t\t\tif (result?.skillPaths?.length) {\n\t\t\t\t\t\tskillPaths.push(...result.skillPaths.map((path) => ({ path, extensionPath: ext.path })));\n\t\t\t\t\t}\n\t\t\t\t\tif (result?.promptPaths?.length) {\n\t\t\t\t\t\tpromptPaths.push(...result.promptPaths.map((path) => ({ path, extensionPath: ext.path })));\n\t\t\t\t\t}\n\t\t\t\t\tif (result?.themePaths?.length) {\n\t\t\t\t\t\tthemePaths.push(...result.themePaths.map((path) => ({ path, extensionPath: ext.path })));\n\t\t\t\t\t}\n\t\t\t\t} catch (err) {\n\t\t\t\t\tconst message = err instanceof Error ? err.message : String(err);\n\t\t\t\t\tconst stack = err instanceof Error ? err.stack : undefined;\n\t\t\t\t\tthis.emitError({\n\t\t\t\t\t\textensionPath: ext.path,\n\t\t\t\t\t\tevent: \"resources_discover\",\n\t\t\t\t\t\terror: message,\n\t\t\t\t\t\tstack,\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn { skillPaths, promptPaths, themePaths };\n\t}\n\n\t/** Emit input event. Transforms chain, \"handled\" short-circuits. */\n\tasync emitInput(text: string, images: ImageContent[] | undefined, source: InputSource): Promise<InputEventResult> {\n\t\tconst ctx = this.createContext();\n\t\tlet currentText = text;\n\t\tlet currentImages = images;\n\n\t\tfor (const ext of this.extensions) {\n\t\t\tfor (const handler of ext.handlers.get(\"input\") ?? []) {\n\t\t\t\ttry {\n\t\t\t\t\tconst event: InputEvent = { type: \"input\", text: currentText, images: currentImages, source };\n\t\t\t\t\tconst result = (await handler(event, ctx)) as InputEventResult | undefined;\n\t\t\t\t\tif (result?.action === \"handled\") return result;\n\t\t\t\t\tif (result?.action === \"transform\") {\n\t\t\t\t\t\tcurrentText = result.text;\n\t\t\t\t\t\tcurrentImages = result.images ?? currentImages;\n\t\t\t\t\t}\n\t\t\t\t} catch (err) {\n\t\t\t\t\tthis.emitError({\n\t\t\t\t\t\textensionPath: ext.path,\n\t\t\t\t\t\tevent: \"input\",\n\t\t\t\t\t\terror: err instanceof Error ? err.message : String(err),\n\t\t\t\t\t\tstack: err instanceof Error ? err.stack : undefined,\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn currentText !== text || currentImages !== images\n\t\t\t? { action: \"transform\", text: currentText, images: currentImages }\n\t\t\t: { action: \"continue\" };\n\t}\n}\n"]}