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{\n\ttype ImageContent,\n\ttype Message,\n\ttype Model,\n\ttype SimpleStreamOptions,\n\tstreamSimple,\n\ttype TextContent,\n\ttype ThinkingBudgets,\n\ttype Transport,\n} from \"@earendil-works/pi-ai\";\nimport { runAgentLoop, runAgentLoopContinue } from \"./agent-loop.ts\";\nimport type {\n\tAfterToolCallContext,\n\tAfterToolCallResult,\n\tAgentContext,\n\tAgentEvent,\n\tAgentLoopConfig,\n\tAgentLoopTurnUpdate,\n\tAgentMessage,\n\tAgentState,\n\tAgentTool,\n\tBeforeToolCallContext,\n\tBeforeToolCallResult,\n\tQueueMode,\n\tStreamFn,\n\tToolExecutionMode,\n} from \"./types.ts\";\n\nexport type { QueueMode } from \"./types.ts\";\n\nfunction defaultConvertToLlm(messages: AgentMessage[]): Message[] {\n\treturn messages.filter(\n\t\t(message) => message.role === \"user\" || message.role === \"assistant\" || message.role === \"toolResult\",\n\t);\n}\n\nconst EMPTY_USAGE = {\n\tinput: 0,\n\toutput: 0,\n\tcacheRead: 0,\n\tcacheWrite: 0,\n\ttotalTokens: 0,\n\tcost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },\n};\n\nconst DEFAULT_MODEL = {\n\tid: \"unknown\",\n\tname: \"unknown\",\n\tapi: \"unknown\",\n\tprovider: \"unknown\",\n\tbaseUrl: \"\",\n\treasoning: false,\n\tinput: [],\n\tcost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },\n\tcontextWindow: 0,\n\tmaxTokens: 0,\n} satisfies Model<any>;\n\ntype MutableAgentState = Omit<AgentState, \"isStreaming\" | \"streamingMessage\" | \"pendingToolCalls\" | \"errorMessage\"> & {\n\tisStreaming: boolean;\n\tstreamingMessage?: AgentMessage;\n\tpendingToolCalls: Set<string>;\n\terrorMessage?: string;\n};\n\nfunction createMutableAgentState(\n\tinitialState?: Partial<Omit<AgentState, \"pendingToolCalls\" | \"isStreaming\" | \"streamingMessage\" | \"errorMessage\">>,\n): MutableAgentState {\n\tlet tools = initialState?.tools?.slice() ?? [];\n\tlet messages = initialState?.messages?.slice() ?? [];\n\n\treturn {\n\t\tsystemPrompt: initialState?.systemPrompt ?? \"\",\n\t\tmodel: initialState?.model ?? DEFAULT_MODEL,\n\t\tthinkingLevel: initialState?.thinkingLevel ?? \"off\",\n\t\tget tools() {\n\t\t\treturn tools;\n\t\t},\n\t\tset tools(nextTools: AgentTool<any>[]) {\n\t\t\ttools = nextTools.slice();\n\t\t},\n\t\tget messages() {\n\t\t\treturn messages;\n\t\t},\n\t\tset messages(nextMessages: AgentMessage[]) {\n\t\t\tmessages = nextMessages.slice();\n\t\t},\n\t\tisStreaming: false,\n\t\tstreamingMessage: undefined,\n\t\tpendingToolCalls: new Set<string>(),\n\t\terrorMessage: undefined,\n\t};\n}\n\n/** Options for constructing an {@link Agent}. */\nexport interface AgentOptions {\n\tinitialState?: Partial<Omit<AgentState, \"pendingToolCalls\" | \"isStreaming\" | \"streamingMessage\" | \"errorMessage\">>;\n\tconvertToLlm?: (messages: AgentMessage[]) => Message[] | Promise<Message[]>;\n\ttransformContext?: (messages: AgentMessage[], signal?: AbortSignal) => Promise<AgentMessage[]>;\n\tstreamFn?: StreamFn;\n\tgetApiKey?: (provider: string) => Promise<string | undefined> | string | undefined;\n\tonPayload?: SimpleStreamOptions[\"onPayload\"];\n\tonResponse?: SimpleStreamOptions[\"onResponse\"];\n\tbeforeToolCall?: (context: BeforeToolCallContext, signal?: AbortSignal) => Promise<BeforeToolCallResult | undefined>;\n\tafterToolCall?: (context: AfterToolCallContext, signal?: AbortSignal) => Promise<AfterToolCallResult | undefined>;\n\tprepareNextTurn?: (\n\t\tsignal?: AbortSignal,\n\t) => Promise<AgentLoopTurnUpdate | undefined> | AgentLoopTurnUpdate | undefined;\n\tsteeringMode?: QueueMode;\n\tfollowUpMode?: QueueMode;\n\tsessionId?: string;\n\tthinkingBudgets?: ThinkingBudgets;\n\ttransport?: Transport;\n\tmaxRetryDelayMs?: number;\n\ttoolExecution?: ToolExecutionMode;\n}\n\nclass PendingMessageQueue {\n\tprivate messages: AgentMessage[] = [];\n\tpublic mode: QueueMode;\n\n\tconstructor(mode: QueueMode) {\n\t\tthis.mode = mode;\n\t}\n\n\tenqueue(message: AgentMessage): void {\n\t\tthis.messages.push(message);\n\t}\n\n\thasItems(): boolean {\n\t\treturn this.messages.length > 0;\n\t}\n\n\tdrain(): AgentMessage[] {\n\t\tif (this.mode === \"all\") {\n\t\t\tconst drained = this.messages.slice();\n\t\t\tthis.messages = [];\n\t\t\treturn drained;\n\t\t}\n\n\t\tconst first = this.messages[0];\n\t\tif (!first) {\n\t\t\treturn [];\n\t\t}\n\t\tthis.messages = this.messages.slice(1);\n\t\treturn [first];\n\t}\n\n\tclear(): void {\n\t\tthis.messages = [];\n\t}\n}\n\ntype ActiveRun = {\n\tpromise: Promise<void>;\n\tresolve: () => void;\n\tabortController: AbortController;\n};\n\n/**\n * Stateful wrapper around the low-level agent loop.\n *\n * `Agent` owns the current transcript, emits lifecycle events, executes tools,\n * and exposes queueing APIs for steering and follow-up messages.\n */\nexport class Agent {\n\tprivate _state: MutableAgentState;\n\tprivate readonly listeners = new Set<(event: AgentEvent, signal: AbortSignal) => Promise<void> | void>();\n\tprivate readonly steeringQueue: PendingMessageQueue;\n\tprivate readonly followUpQueue: PendingMessageQueue;\n\n\tpublic convertToLlm: (messages: AgentMessage[]) => Message[] | Promise<Message[]>;\n\tpublic transformContext?: (messages: AgentMessage[], signal?: AbortSignal) => Promise<AgentMessage[]>;\n\tpublic streamFn: StreamFn;\n\tpublic getApiKey?: (provider: string) => Promise<string | undefined> | string | undefined;\n\tpublic onPayload?: SimpleStreamOptions[\"onPayload\"];\n\tpublic onResponse?: SimpleStreamOptions[\"onResponse\"];\n\tpublic beforeToolCall?: (\n\t\tcontext: BeforeToolCallContext,\n\t\tsignal?: AbortSignal,\n\t) => Promise<BeforeToolCallResult | undefined>;\n\tpublic afterToolCall?: (\n\t\tcontext: AfterToolCallContext,\n\t\tsignal?: AbortSignal,\n\t) => Promise<AfterToolCallResult | undefined>;\n\tpublic prepareNextTurn?: (\n\t\tsignal?: AbortSignal,\n\t) => Promise<AgentLoopTurnUpdate | undefined> | AgentLoopTurnUpdate | undefined;\n\tprivate activeRun?: ActiveRun;\n\t/** Session identifier forwarded to providers for cache-aware backends. */\n\tpublic sessionId?: string;\n\t/** Optional per-level thinking token budgets forwarded to the stream function. */\n\tpublic thinkingBudgets?: ThinkingBudgets;\n\t/** Preferred transport forwarded to the stream function. */\n\tpublic transport: Transport;\n\t/** Optional cap for provider-requested retry delays. */\n\tpublic maxRetryDelayMs?: number;\n\t/** Tool execution strategy for assistant messages that contain multiple tool calls. */\n\tpublic toolExecution: ToolExecutionMode;\n\n\tconstructor(options: AgentOptions = {}) {\n\t\tthis._state = createMutableAgentState(options.initialState);\n\t\tthis.convertToLlm = options.convertToLlm ?? defaultConvertToLlm;\n\t\tthis.transformContext = options.transformContext;\n\t\tthis.streamFn = options.streamFn ?? streamSimple;\n\t\tthis.getApiKey = options.getApiKey;\n\t\tthis.onPayload = options.onPayload;\n\t\tthis.onResponse = options.onResponse;\n\t\tthis.beforeToolCall = options.beforeToolCall;\n\t\tthis.afterToolCall = options.afterToolCall;\n\t\tthis.prepareNextTurn = options.prepareNextTurn;\n\t\tthis.steeringQueue = new PendingMessageQueue(options.steeringMode ?? \"one-at-a-time\");\n\t\tthis.followUpQueue = new PendingMessageQueue(options.followUpMode ?? \"one-at-a-time\");\n\t\tthis.sessionId = options.sessionId;\n\t\tthis.thinkingBudgets = options.thinkingBudgets;\n\t\tthis.transport = options.transport ?? \"auto\";\n\t\tthis.maxRetryDelayMs = options.maxRetryDelayMs;\n\t\tthis.toolExecution = options.toolExecution ?? \"parallel\";\n\t}\n\n\t/**\n\t * Subscribe to agent lifecycle events.\n\t *\n\t * Listener promises are awaited in subscription order and are included in\n\t * the current run's settlement. Listeners also receive the active abort\n\t * signal for the current run.\n\t *\n\t * `agent_end` is the final emitted event for a run, but the agent does not\n\t * become idle until all awaited listeners for that event have settled.\n\t */\n\tsubscribe(listener: (event: AgentEvent, signal: AbortSignal) => Promise<void> | void): () => void {\n\t\tthis.listeners.add(listener);\n\t\treturn () => this.listeners.delete(listener);\n\t}\n\n\t/**\n\t * Current agent state.\n\t *\n\t * Assigning `state.tools` or `state.messages` copies the provided top-level array.\n\t */\n\tget state(): AgentState {\n\t\treturn this._state;\n\t}\n\n\t/** Controls how queued steering messages are drained. */\n\tset steeringMode(mode: QueueMode) {\n\t\tthis.steeringQueue.mode = mode;\n\t}\n\n\tget steeringMode(): QueueMode {\n\t\treturn this.steeringQueue.mode;\n\t}\n\n\t/** Controls how queued follow-up messages are drained. */\n\tset followUpMode(mode: QueueMode) {\n\t\tthis.followUpQueue.mode = mode;\n\t}\n\n\tget followUpMode(): QueueMode {\n\t\treturn this.followUpQueue.mode;\n\t}\n\n\t/** Queue a message to be injected after the current assistant turn finishes. */\n\tsteer(message: AgentMessage): void {\n\t\tthis.steeringQueue.enqueue(message);\n\t}\n\n\t/** Queue a message to run only after the agent would otherwise stop. */\n\tfollowUp(message: AgentMessage): void {\n\t\tthis.followUpQueue.enqueue(message);\n\t}\n\n\t/** Remove all queued steering messages. */\n\tclearSteeringQueue(): void {\n\t\tthis.steeringQueue.clear();\n\t}\n\n\t/** Remove all queued follow-up messages. */\n\tclearFollowUpQueue(): void {\n\t\tthis.followUpQueue.clear();\n\t}\n\n\t/** Remove all queued steering and follow-up messages. */\n\tclearAllQueues(): void {\n\t\tthis.clearSteeringQueue();\n\t\tthis.clearFollowUpQueue();\n\t}\n\n\t/** Returns true when either queue still contains pending messages. */\n\thasQueuedMessages(): boolean {\n\t\treturn this.steeringQueue.hasItems() || this.followUpQueue.hasItems();\n\t}\n\n\t/** Active abort signal for the current run, if any. */\n\tget signal(): AbortSignal | undefined {\n\t\treturn this.activeRun?.abortController.signal;\n\t}\n\n\t/** Abort the current run, if one is active. */\n\tabort(): void {\n\t\tthis.activeRun?.abortController.abort();\n\t}\n\n\t/**\n\t * Resolve when the current run and all awaited event listeners have finished.\n\t *\n\t * This resolves after `agent_end` listeners settle.\n\t */\n\twaitForIdle(): Promise<void> {\n\t\treturn this.activeRun?.promise ?? Promise.resolve();\n\t}\n\n\t/** Clear transcript state, runtime state, and queued messages. */\n\treset(): void {\n\t\tthis._state.messages = [];\n\t\tthis._state.isStreaming = false;\n\t\tthis._state.streamingMessage = undefined;\n\t\tthis._state.pendingToolCalls = new Set<string>();\n\t\tthis._state.errorMessage = undefined;\n\t\tthis.clearFollowUpQueue();\n\t\tthis.clearSteeringQueue();\n\t}\n\n\t/** Start a new prompt from text, a single message, or a batch of messages. */\n\tasync prompt(message: AgentMessage | AgentMessage[]): Promise<void>;\n\tasync prompt(input: string, images?: ImageContent[]): Promise<void>;\n\tasync prompt(input: string | AgentMessage | AgentMessage[], images?: ImageContent[]): Promise<void> {\n\t\tif (this.activeRun) {\n\t\t\tthrow new Error(\n\t\t\t\t\"Agent is already processing a prompt. Use steer() or followUp() to queue messages, or wait for completion.\",\n\t\t\t);\n\t\t}\n\t\tconst messages = this.normalizePromptInput(input, images);\n\t\tawait this.runPromptMessages(messages);\n\t}\n\n\t/** Continue from the current transcript. The last message must be a user or tool-result message. */\n\tasync continue(): Promise<void> {\n\t\tif (this.activeRun) {\n\t\t\tthrow new Error(\"Agent is already processing. Wait for completion before continuing.\");\n\t\t}\n\n\t\tconst lastMessage = this._state.messages[this._state.messages.length - 1];\n\t\tif (!lastMessage) {\n\t\t\tthrow new Error(\"No messages to continue from\");\n\t\t}\n\n\t\tif (lastMessage.role === \"assistant\") {\n\t\t\tconst queuedSteering = this.steeringQueue.drain();\n\t\t\tif (queuedSteering.length > 0) {\n\t\t\t\tawait this.runPromptMessages(queuedSteering, { skipInitialSteeringPoll: true });\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst queuedFollowUps = this.followUpQueue.drain();\n\t\t\tif (queuedFollowUps.length > 0) {\n\t\t\t\tawait this.runPromptMessages(queuedFollowUps);\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tthrow new Error(\"Cannot continue from message role: assistant\");\n\t\t}\n\n\t\tawait this.runContinuation();\n\t}\n\n\tprivate normalizePromptInput(\n\t\tinput: string | AgentMessage | AgentMessage[],\n\t\timages?: ImageContent[],\n\t): AgentMessage[] {\n\t\tif (Array.isArray(input)) {\n\t\t\treturn input;\n\t\t}\n\n\t\tif (typeof input !== \"string\") {\n\t\t\treturn [input];\n\t\t}\n\n\t\tconst content: Array<TextContent | ImageContent> = [{ type: \"text\", text: input }];\n\t\tif (images && images.length > 0) {\n\t\t\tcontent.push(...images);\n\t\t}\n\t\treturn [{ role: \"user\", content, timestamp: Date.now() }];\n\t}\n\n\tprivate async runPromptMessages(\n\t\tmessages: AgentMessage[],\n\t\toptions: { skipInitialSteeringPoll?: boolean } = {},\n\t): Promise<void> {\n\t\tawait this.runWithLifecycle(async (signal) => {\n\t\t\tawait runAgentLoop(\n\t\t\t\tmessages,\n\t\t\t\tthis.createContextSnapshot(),\n\t\t\t\tthis.createLoopConfig(options),\n\t\t\t\t(event) => this.processEvents(event),\n\t\t\t\tsignal,\n\t\t\t\tthis.streamFn,\n\t\t\t);\n\t\t});\n\t}\n\n\tprivate async runContinuation(): Promise<void> {\n\t\tawait this.runWithLifecycle(async (signal) => {\n\t\t\tawait runAgentLoopContinue(\n\t\t\t\tthis.createContextSnapshot(),\n\t\t\t\tthis.createLoopConfig(),\n\t\t\t\t(event) => this.processEvents(event),\n\t\t\t\tsignal,\n\t\t\t\tthis.streamFn,\n\t\t\t);\n\t\t});\n\t}\n\n\tprivate createContextSnapshot(): AgentContext {\n\t\treturn {\n\t\t\tsystemPrompt: this._state.systemPrompt,\n\t\t\tmessages: this._state.messages.slice(),\n\t\t\ttools: this._state.tools.slice(),\n\t\t};\n\t}\n\n\tprivate createLoopConfig(options: { skipInitialSteeringPoll?: boolean } = {}): AgentLoopConfig {\n\t\tlet skipInitialSteeringPoll = options.skipInitialSteeringPoll === true;\n\t\treturn {\n\t\t\tmodel: this._state.model,\n\t\t\treasoning: this._state.thinkingLevel === \"off\" ? undefined : this._state.thinkingLevel,\n\t\t\tsessionId: this.sessionId,\n\t\t\tonPayload: this.onPayload,\n\t\t\tonResponse: this.onResponse,\n\t\t\ttransport: this.transport,\n\t\t\tthinkingBudgets: this.thinkingBudgets,\n\t\t\tmaxRetryDelayMs: this.maxRetryDelayMs,\n\t\t\ttoolExecution: this.toolExecution,\n\t\t\tbeforeToolCall: this.beforeToolCall,\n\t\t\tafterToolCall: this.afterToolCall,\n\t\t\tprepareNextTurn: this.prepareNextTurn ? async () => await this.prepareNextTurn?.(this.signal) : undefined,\n\t\t\tconvertToLlm: this.convertToLlm,\n\t\t\ttransformContext: this.transformContext,\n\t\t\tgetApiKey: this.getApiKey,\n\t\t\tgetSteeringMessages: async () => {\n\t\t\t\tif (skipInitialSteeringPoll) {\n\t\t\t\t\tskipInitialSteeringPoll = false;\n\t\t\t\t\treturn [];\n\t\t\t\t}\n\t\t\t\treturn this.steeringQueue.drain();\n\t\t\t},\n\t\t\tgetFollowUpMessages: async () => this.followUpQueue.drain(),\n\t\t};\n\t}\n\n\tprivate async runWithLifecycle(executor: (signal: AbortSignal) => Promise<void>): Promise<void> {\n\t\tif (this.activeRun) {\n\t\t\tthrow new Error(\"Agent is already processing.\");\n\t\t}\n\n\t\tconst abortController = new AbortController();\n\t\tlet resolvePromise = () => {};\n\t\tconst promise = new Promise<void>((resolve) => {\n\t\t\tresolvePromise = resolve;\n\t\t});\n\t\tthis.activeRun = { promise, resolve: resolvePromise, abortController };\n\n\t\tthis._state.isStreaming = true;\n\t\tthis._state.streamingMessage = undefined;\n\t\tthis._state.errorMessage = undefined;\n\n\t\ttry {\n\t\t\tawait executor(abortController.signal);\n\t\t} catch (error) {\n\t\t\tawait this.handleRunFailure(error, abortController.signal.aborted);\n\t\t} finally {\n\t\t\tthis.finishRun();\n\t\t}\n\t}\n\n\tprivate async handleRunFailure(error: unknown, aborted: boolean): Promise<void> {\n\t\tconst failureMessage = {\n\t\t\trole: \"assistant\",\n\t\t\tcontent: [{ type: \"text\", text: \"\" }],\n\t\t\tapi: this._state.model.api,\n\t\t\tprovider: this._state.model.provider,\n\t\t\tmodel: this._state.model.id,\n\t\t\tusage: EMPTY_USAGE,\n\t\t\tstopReason: aborted ? \"aborted\" : \"error\",\n\t\t\terrorMessage: error instanceof Error ? error.message : String(error),\n\t\t\ttimestamp: Date.now(),\n\t\t} satisfies AgentMessage;\n\t\tawait this.processEvents({ type: \"message_start\", message: failureMessage });\n\t\tawait this.processEvents({ type: \"message_end\", message: failureMessage });\n\t\tawait this.processEvents({ type: \"turn_end\", message: failureMessage, toolResults: [] });\n\t\tawait this.processEvents({ type: \"agent_end\", messages: [failureMessage] });\n\t}\n\n\tprivate finishRun(): void {\n\t\tthis._state.isStreaming = false;\n\t\tthis._state.streamingMessage = undefined;\n\t\tthis._state.pendingToolCalls = new Set<string>();\n\t\tthis.activeRun?.resolve();\n\t\tthis.activeRun = undefined;\n\t}\n\n\t/**\n\t * Reduce internal state for a loop event, then await listeners.\n\t *\n\t * `agent_end` only means no further loop events will be emitted. The run is\n\t * considered idle later, after all awaited listeners for `agent_end` finish\n\t * and `finishRun()` clears runtime-owned state.\n\t */\n\tprivate async processEvents(event: AgentEvent): Promise<void> {\n\t\tswitch (event.type) {\n\t\t\tcase \"message_start\":\n\t\t\t\tthis._state.streamingMessage = event.message;\n\t\t\t\tbreak;\n\n\t\t\tcase \"message_update\":\n\t\t\t\tthis._state.streamingMessage = event.message;\n\t\t\t\tbreak;\n\n\t\t\tcase \"message_end\":\n\t\t\t\tthis._state.streamingMessage = undefined;\n\t\t\t\tthis._state.messages.push(event.message);\n\t\t\t\tbreak;\n\n\t\t\tcase \"tool_execution_start\": {\n\t\t\t\tconst pendingToolCalls = new Set(this._state.pendingToolCalls);\n\t\t\t\tpendingToolCalls.add(event.toolCallId);\n\t\t\t\tthis._state.pendingToolCalls = pendingToolCalls;\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\tcase \"tool_execution_end\": {\n\t\t\t\tconst pendingToolCalls = new Set(this._state.pendingToolCalls);\n\t\t\t\tpendingToolCalls.delete(event.toolCallId);\n\t\t\t\tthis._state.pendingToolCalls = pendingToolCalls;\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\tcase \"turn_end\":\n\t\t\t\tif (event.message.role === \"assistant\" && event.message.errorMessage) {\n\t\t\t\t\tthis._state.errorMessage = event.message.errorMessage;\n\t\t\t\t}\n\t\t\t\tbreak;\n\n\t\t\tcase \"agent_end\":\n\t\t\t\tthis._state.streamingMessage = undefined;\n\t\t\t\tbreak;\n\t\t}\n\n\t\tconst signal = this.activeRun?.abortController.signal;\n\t\tif (!signal) {\n\t\t\tthrow new Error(\"Agent listener invoked outside active run\");\n\t\t}\n\t\tfor (const listener of this.listeners) {\n\t\t\tawait listener(event, signal);\n\t\t}\n\t}\n}\n"]}