{"version":3,"file":"agent-loop.d.ts","sourceRoot":"","sources":["../src/agent-loop.ts"],"names":[],"mappings":"AAAA;;;GAGG;AAEH,OAAO,EAGN,WAAW,EAIX,MAAM,uBAAuB,CAAC;AAC/B,OAAO,KAAK,EACX,YAAY,EACZ,UAAU,EACV,eAAe,EACf,YAAY,EAIZ,QAAQ,EACR,MAAM,YAAY,CAAC;AAEpB,MAAM,MAAM,cAAc,GAAG,CAAC,KAAK,EAAE,UAAU,KAAK,OAAO,CAAC,IAAI,CAAC,GAAG,IAAI,CAAC;AAEzE;;;GAGG;AACH,wBAAgB,SAAS,CACxB,OAAO,EAAE,YAAY,EAAE,EACvB,OAAO,EAAE,YAAY,EACrB,MAAM,EAAE,eAAe,EACvB,MAAM,CAAC,EAAE,WAAW,EACpB,QAAQ,CAAC,EAAE,QAAQ,GACjB,WAAW,CAAC,UAAU,EAAE,YAAY,EAAE,CAAC,CAiBzC;AAED;;;;;;;GAOG;AACH,wBAAgB,iBAAiB,CAChC,OAAO,EAAE,YAAY,EACrB,MAAM,EAAE,eAAe,EACvB,MAAM,CAAC,EAAE,WAAW,EACpB,QAAQ,CAAC,EAAE,QAAQ,GACjB,WAAW,CAAC,UAAU,EAAE,YAAY,EAAE,CAAC,CAwBzC;AAED,wBAAsB,YAAY,CACjC,OAAO,EAAE,YAAY,EAAE,EACvB,OAAO,EAAE,YAAY,EACrB,MAAM,EAAE,eAAe,EACvB,IAAI,EAAE,cAAc,EACpB,MAAM,CAAC,EAAE,WAAW,EACpB,QAAQ,CAAC,EAAE,QAAQ,GACjB,OAAO,CAAC,YAAY,EAAE,CAAC,CAgBzB;AAED,wBAAsB,oBAAoB,CACzC,OAAO,EAAE,YAAY,EACrB,MAAM,EAAE,eAAe,EACvB,IAAI,EAAE,cAAc,EACpB,MAAM,CAAC,EAAE,WAAW,EACpB,QAAQ,CAAC,EAAE,QAAQ,GACjB,OAAO,CAAC,YAAY,EAAE,CAAC,CAiBzB","sourcesContent":["/**\n * Agent loop that works with AgentMessage throughout.\n * Transforms to Message[] only at the LLM call boundary.\n */\n\nimport {\n\ttype AssistantMessage,\n\ttype Context,\n\tEventStream,\n\tstreamSimple,\n\ttype ToolResultMessage,\n\tvalidateToolArguments,\n} from \"@earendil-works/pi-ai\";\nimport type {\n\tAgentContext,\n\tAgentEvent,\n\tAgentLoopConfig,\n\tAgentMessage,\n\tAgentTool,\n\tAgentToolCall,\n\tAgentToolResult,\n\tStreamFn,\n} from \"./types.ts\";\n\nexport type AgentEventSink = (event: AgentEvent) => Promise<void> | void;\n\n/**\n * Start an agent loop with a new prompt message.\n * The prompt is added to the context and events are emitted for it.\n */\nexport function agentLoop(\n\tprompts: AgentMessage[],\n\tcontext: AgentContext,\n\tconfig: AgentLoopConfig,\n\tsignal?: AbortSignal,\n\tstreamFn?: StreamFn,\n): EventStream<AgentEvent, AgentMessage[]> {\n\tconst stream = createAgentStream();\n\n\tvoid runAgentLoop(\n\t\tprompts,\n\t\tcontext,\n\t\tconfig,\n\t\tasync (event) => {\n\t\t\tstream.push(event);\n\t\t},\n\t\tsignal,\n\t\tstreamFn,\n\t).then((messages) => {\n\t\tstream.end(messages);\n\t});\n\n\treturn stream;\n}\n\n/**\n * Continue an agent loop from the current context without adding a new message.\n * Used for retries - context already has user message or tool results.\n *\n * **Important:** The last message in context must convert to a `user` or `toolResult` message\n * via `convertToLlm`. If it doesn't, the LLM provider will reject the request.\n * This cannot be validated here since `convertToLlm` is only called once per turn.\n */\nexport function agentLoopContinue(\n\tcontext: AgentContext,\n\tconfig: AgentLoopConfig,\n\tsignal?: AbortSignal,\n\tstreamFn?: StreamFn,\n): EventStream<AgentEvent, AgentMessage[]> {\n\tif (context.messages.length === 0) {\n\t\tthrow new Error(\"Cannot continue: no messages in context\");\n\t}\n\n\tif (context.messages[context.messages.length - 1].role === \"assistant\") {\n\t\tthrow new Error(\"Cannot continue from message role: assistant\");\n\t}\n\n\tconst stream = createAgentStream();\n\n\tvoid runAgentLoopContinue(\n\t\tcontext,\n\t\tconfig,\n\t\tasync (event) => {\n\t\t\tstream.push(event);\n\t\t},\n\t\tsignal,\n\t\tstreamFn,\n\t).then((messages) => {\n\t\tstream.end(messages);\n\t});\n\n\treturn stream;\n}\n\nexport async function runAgentLoop(\n\tprompts: AgentMessage[],\n\tcontext: AgentContext,\n\tconfig: AgentLoopConfig,\n\temit: AgentEventSink,\n\tsignal?: AbortSignal,\n\tstreamFn?: StreamFn,\n): Promise<AgentMessage[]> {\n\tconst newMessages: AgentMessage[] = [...prompts];\n\tconst currentContext: AgentContext = {\n\t\t...context,\n\t\tmessages: [...context.messages, ...prompts],\n\t};\n\n\tawait emit({ type: \"agent_start\" });\n\tawait emit({ type: \"turn_start\" });\n\tfor (const prompt of prompts) {\n\t\tawait emit({ type: \"message_start\", message: prompt });\n\t\tawait emit({ type: \"message_end\", message: prompt });\n\t}\n\n\tawait runLoop(currentContext, newMessages, config, signal, emit, streamFn);\n\treturn newMessages;\n}\n\nexport async function runAgentLoopContinue(\n\tcontext: AgentContext,\n\tconfig: AgentLoopConfig,\n\temit: AgentEventSink,\n\tsignal?: AbortSignal,\n\tstreamFn?: StreamFn,\n): Promise<AgentMessage[]> {\n\tif (context.messages.length === 0) {\n\t\tthrow new Error(\"Cannot continue: no messages in context\");\n\t}\n\n\tif (context.messages[context.messages.length - 1].role === \"assistant\") {\n\t\tthrow new Error(\"Cannot continue from message role: assistant\");\n\t}\n\n\tconst newMessages: AgentMessage[] = [];\n\tconst currentContext: AgentContext = { ...context };\n\n\tawait emit({ type: \"agent_start\" });\n\tawait emit({ type: \"turn_start\" });\n\n\tawait runLoop(currentContext, newMessages, config, signal, emit, streamFn);\n\treturn newMessages;\n}\n\nfunction createAgentStream(): EventStream<AgentEvent, AgentMessage[]> {\n\treturn new EventStream<AgentEvent, AgentMessage[]>(\n\t\t(event: AgentEvent) => event.type === \"agent_end\",\n\t\t(event: AgentEvent) => (event.type === \"agent_end\" ? event.messages : []),\n\t);\n}\n\n/**\n * Main loop logic shared by agentLoop and agentLoopContinue.\n */\nasync function runLoop(\n\tinitialContext: AgentContext,\n\tnewMessages: AgentMessage[],\n\tinitialConfig: AgentLoopConfig,\n\tsignal: AbortSignal | undefined,\n\temit: AgentEventSink,\n\tstreamFn?: StreamFn,\n): Promise<void> {\n\tlet currentContext = initialContext;\n\tlet config = initialConfig;\n\tlet firstTurn = true;\n\t// Check for steering messages at start (user may have typed while waiting)\n\tlet pendingMessages: AgentMessage[] = (await config.getSteeringMessages?.()) || [];\n\n\t// Outer loop: continues when queued follow-up messages arrive after agent would stop\n\twhile (true) {\n\t\tlet hasMoreToolCalls = true;\n\n\t\t// Inner loop: process tool calls and steering messages\n\t\twhile (hasMoreToolCalls || pendingMessages.length > 0) {\n\t\t\tif (!firstTurn) {\n\t\t\t\tawait emit({ type: \"turn_start\" });\n\t\t\t} else {\n\t\t\t\tfirstTurn = false;\n\t\t\t}\n\n\t\t\t// Process pending messages (inject before next assistant response)\n\t\t\tif (pendingMessages.length > 0) {\n\t\t\t\tfor (const message of pendingMessages) {\n\t\t\t\t\tawait emit({ type: \"message_start\", message });\n\t\t\t\t\tawait emit({ type: \"message_end\", message });\n\t\t\t\t\tcurrentContext.messages.push(message);\n\t\t\t\t\tnewMessages.push(message);\n\t\t\t\t}\n\t\t\t\tpendingMessages = [];\n\t\t\t}\n\n\t\t\t// Stream assistant response\n\t\t\tconst message = await streamAssistantResponse(currentContext, config, signal, emit, streamFn);\n\t\t\tnewMessages.push(message);\n\n\t\t\tif (message.stopReason === \"error\" || message.stopReason === \"aborted\") {\n\t\t\t\tawait emit({ type: \"turn_end\", message, toolResults: [] });\n\t\t\t\tawait emit({ type: \"agent_end\", messages: newMessages });\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Check for tool calls\n\t\t\tconst toolCalls = message.content.filter((c) => c.type === \"toolCall\");\n\n\t\t\tconst toolResults: ToolResultMessage[] = [];\n\t\t\thasMoreToolCalls = false;\n\t\t\tif (toolCalls.length > 0) {\n\t\t\t\tconst executedToolBatch = await executeToolCalls(currentContext, message, config, signal, emit);\n\t\t\t\ttoolResults.push(...executedToolBatch.messages);\n\t\t\t\thasMoreToolCalls = !executedToolBatch.terminate;\n\n\t\t\t\tfor (const result of toolResults) {\n\t\t\t\t\tcurrentContext.messages.push(result);\n\t\t\t\t\tnewMessages.push(result);\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tawait emit({ type: \"turn_end\", message, toolResults });\n\n\t\t\tconst nextTurnContext = {\n\t\t\t\tmessage,\n\t\t\t\ttoolResults,\n\t\t\t\tcontext: currentContext,\n\t\t\t\tnewMessages,\n\t\t\t};\n\t\t\tconst nextTurnSnapshot = await config.prepareNextTurn?.(nextTurnContext);\n\t\t\tif (nextTurnSnapshot) {\n\t\t\t\tcurrentContext = nextTurnSnapshot.context ?? currentContext;\n\t\t\t\tconfig = {\n\t\t\t\t\t...config,\n\t\t\t\t\tmodel: nextTurnSnapshot.model ?? config.model,\n\t\t\t\t\treasoning:\n\t\t\t\t\t\tnextTurnSnapshot.thinkingLevel === undefined\n\t\t\t\t\t\t\t? config.reasoning\n\t\t\t\t\t\t\t: nextTurnSnapshot.thinkingLevel === \"off\"\n\t\t\t\t\t\t\t\t? undefined\n\t\t\t\t\t\t\t\t: nextTurnSnapshot.thinkingLevel,\n\t\t\t\t};\n\t\t\t}\n\n\t\t\tif (\n\t\t\t\tawait config.shouldStopAfterTurn?.({\n\t\t\t\t\tmessage,\n\t\t\t\t\ttoolResults,\n\t\t\t\t\tcontext: currentContext,\n\t\t\t\t\tnewMessages,\n\t\t\t\t})\n\t\t\t) {\n\t\t\t\tawait emit({ type: \"agent_end\", messages: newMessages });\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tpendingMessages = (await config.getSteeringMessages?.()) || [];\n\t\t}\n\n\t\t// Agent would stop here. Check for follow-up messages.\n\t\tconst followUpMessages = (await config.getFollowUpMessages?.()) || [];\n\t\tif (followUpMessages.length > 0) {\n\t\t\t// Set as pending so inner loop processes them\n\t\t\tpendingMessages = followUpMessages;\n\t\t\tcontinue;\n\t\t}\n\n\t\t// No more messages, exit\n\t\tbreak;\n\t}\n\n\tawait emit({ type: \"agent_end\", messages: newMessages });\n}\n\n/**\n * Stream an assistant response from the LLM.\n * This is where AgentMessage[] gets transformed to Message[] for the LLM.\n */\nasync function streamAssistantResponse(\n\tcontext: AgentContext,\n\tconfig: AgentLoopConfig,\n\tsignal: AbortSignal | undefined,\n\temit: AgentEventSink,\n\tstreamFn?: StreamFn,\n): Promise<AssistantMessage> {\n\t// Apply context transform if configured (AgentMessage[] → AgentMessage[])\n\tlet messages = context.messages;\n\tif (config.transformContext) {\n\t\tmessages = await config.transformContext(messages, signal);\n\t}\n\n\t// Convert to LLM-compatible messages (AgentMessage[] → Message[])\n\tconst llmMessages = await config.convertToLlm(messages);\n\n\t// Build LLM context\n\tconst llmContext: Context = {\n\t\tsystemPrompt: context.systemPrompt,\n\t\tmessages: llmMessages,\n\t\ttools: context.tools,\n\t};\n\n\tconst streamFunction = streamFn || streamSimple;\n\n\t// Resolve API key (important for expiring tokens)\n\tconst resolvedApiKey =\n\t\t(config.getApiKey ? await config.getApiKey(config.model.provider) : undefined) || config.apiKey;\n\n\tconst response = await streamFunction(config.model, llmContext, {\n\t\t...config,\n\t\tapiKey: resolvedApiKey,\n\t\tsignal,\n\t});\n\n\tlet partialMessage: AssistantMessage | null = null;\n\tlet addedPartial = false;\n\n\tfor await (const event of response) {\n\t\tswitch (event.type) {\n\t\t\tcase \"start\":\n\t\t\t\tpartialMessage = event.partial;\n\t\t\t\tcontext.messages.push(partialMessage);\n\t\t\t\taddedPartial = true;\n\t\t\t\tawait emit({ type: \"message_start\", message: { ...partialMessage } });\n\t\t\t\tbreak;\n\n\t\t\tcase \"text_start\":\n\t\t\tcase \"text_delta\":\n\t\t\tcase \"text_end\":\n\t\t\tcase \"thinking_start\":\n\t\t\tcase \"thinking_delta\":\n\t\t\tcase \"thinking_end\":\n\t\t\tcase \"toolcall_start\":\n\t\t\tcase \"toolcall_delta\":\n\t\t\tcase \"toolcall_end\":\n\t\t\t\tif (partialMessage) {\n\t\t\t\t\tpartialMessage = event.partial;\n\t\t\t\t\tcontext.messages[context.messages.length - 1] = partialMessage;\n\t\t\t\t\tawait emit({\n\t\t\t\t\t\ttype: \"message_update\",\n\t\t\t\t\t\tassistantMessageEvent: event,\n\t\t\t\t\t\tmessage: { ...partialMessage },\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t\tbreak;\n\n\t\t\tcase \"done\":\n\t\t\tcase \"error\": {\n\t\t\t\tconst finalMessage = await response.result();\n\t\t\t\tif (addedPartial) {\n\t\t\t\t\tcontext.messages[context.messages.length - 1] = finalMessage;\n\t\t\t\t} else {\n\t\t\t\t\tcontext.messages.push(finalMessage);\n\t\t\t\t}\n\t\t\t\tif (!addedPartial) {\n\t\t\t\t\tawait emit({ type: \"message_start\", message: { ...finalMessage } });\n\t\t\t\t}\n\t\t\t\tawait emit({ type: \"message_end\", message: finalMessage });\n\t\t\t\treturn finalMessage;\n\t\t\t}\n\t\t}\n\t}\n\n\tconst finalMessage = await response.result();\n\tif (addedPartial) {\n\t\tcontext.messages[context.messages.length - 1] = finalMessage;\n\t} else {\n\t\tcontext.messages.push(finalMessage);\n\t\tawait emit({ type: \"message_start\", message: { ...finalMessage } });\n\t}\n\tawait emit({ type: \"message_end\", message: finalMessage });\n\treturn finalMessage;\n}\n\n/**\n * Execute tool calls from an assistant message.\n */\nasync function executeToolCalls(\n\tcurrentContext: AgentContext,\n\tassistantMessage: AssistantMessage,\n\tconfig: AgentLoopConfig,\n\tsignal: AbortSignal | undefined,\n\temit: AgentEventSink,\n): Promise<ExecutedToolCallBatch> {\n\tconst toolCalls = assistantMessage.content.filter((c) => c.type === \"toolCall\");\n\tconst hasSequentialToolCall = toolCalls.some(\n\t\t(tc) => currentContext.tools?.find((t) => t.name === tc.name)?.executionMode === \"sequential\",\n\t);\n\tif (config.toolExecution === \"sequential\" || hasSequentialToolCall) {\n\t\treturn executeToolCallsSequential(currentContext, assistantMessage, toolCalls, config, signal, emit);\n\t}\n\treturn executeToolCallsParallel(currentContext, assistantMessage, toolCalls, config, signal, emit);\n}\n\ntype ExecutedToolCallBatch = {\n\tmessages: ToolResultMessage[];\n\tterminate: boolean;\n};\n\nasync function executeToolCallsSequential(\n\tcurrentContext: AgentContext,\n\tassistantMessage: AssistantMessage,\n\ttoolCalls: AgentToolCall[],\n\tconfig: AgentLoopConfig,\n\tsignal: AbortSignal | undefined,\n\temit: AgentEventSink,\n): Promise<ExecutedToolCallBatch> {\n\tconst finalizedCalls: FinalizedToolCallOutcome[] = [];\n\tconst messages: ToolResultMessage[] = [];\n\n\tfor (const toolCall of toolCalls) {\n\t\tawait emit({\n\t\t\ttype: \"tool_execution_start\",\n\t\t\ttoolCallId: toolCall.id,\n\t\t\ttoolName: toolCall.name,\n\t\t\targs: toolCall.arguments,\n\t\t});\n\n\t\tconst preparation = await prepareToolCall(currentContext, assistantMessage, toolCall, config, signal);\n\t\tlet finalized: FinalizedToolCallOutcome;\n\t\tif (preparation.kind === \"immediate\") {\n\t\t\tfinalized = {\n\t\t\t\ttoolCall,\n\t\t\t\tresult: preparation.result,\n\t\t\t\tisError: preparation.isError,\n\t\t\t};\n\t\t} else {\n\t\t\tconst executed = await executePreparedToolCall(preparation, signal, emit);\n\t\t\tfinalized = await finalizeExecutedToolCall(\n\t\t\t\tcurrentContext,\n\t\t\t\tassistantMessage,\n\t\t\t\tpreparation,\n\t\t\t\texecuted,\n\t\t\t\tconfig,\n\t\t\t\tsignal,\n\t\t\t);\n\t\t}\n\n\t\tawait emitToolExecutionEnd(finalized, emit);\n\t\tconst toolResultMessage = createToolResultMessage(finalized);\n\t\tawait emitToolResultMessage(toolResultMessage, emit);\n\t\tfinalizedCalls.push(finalized);\n\t\tmessages.push(toolResultMessage);\n\n\t\tif (signal?.aborted) {\n\t\t\tbreak;\n\t\t}\n\t}\n\n\treturn {\n\t\tmessages,\n\t\tterminate: shouldTerminateToolBatch(finalizedCalls),\n\t};\n}\n\nasync function executeToolCallsParallel(\n\tcurrentContext: AgentContext,\n\tassistantMessage: AssistantMessage,\n\ttoolCalls: AgentToolCall[],\n\tconfig: AgentLoopConfig,\n\tsignal: AbortSignal | undefined,\n\temit: AgentEventSink,\n): Promise<ExecutedToolCallBatch> {\n\tconst finalizedCalls: FinalizedToolCallEntry[] = [];\n\n\tfor (const toolCall of toolCalls) {\n\t\tawait emit({\n\t\t\ttype: \"tool_execution_start\",\n\t\t\ttoolCallId: toolCall.id,\n\t\t\ttoolName: toolCall.name,\n\t\t\targs: toolCall.arguments,\n\t\t});\n\n\t\tconst preparation = await prepareToolCall(currentContext, assistantMessage, toolCall, config, signal);\n\t\tif (preparation.kind === \"immediate\") {\n\t\t\tconst finalized = {\n\t\t\t\ttoolCall,\n\t\t\t\tresult: preparation.result,\n\t\t\t\tisError: preparation.isError,\n\t\t\t} satisfies FinalizedToolCallOutcome;\n\t\t\tawait emitToolExecutionEnd(finalized, emit);\n\t\t\tfinalizedCalls.push(finalized);\n\t\t\tif (signal?.aborted) {\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tcontinue;\n\t\t}\n\n\t\tfinalizedCalls.push(async () => {\n\t\t\tconst executed = await executePreparedToolCall(preparation, signal, emit);\n\t\t\tconst finalized = await finalizeExecutedToolCall(\n\t\t\t\tcurrentContext,\n\t\t\t\tassistantMessage,\n\t\t\t\tpreparation,\n\t\t\t\texecuted,\n\t\t\t\tconfig,\n\t\t\t\tsignal,\n\t\t\t);\n\t\t\tawait emitToolExecutionEnd(finalized, emit);\n\t\t\treturn finalized;\n\t\t});\n\t\tif (signal?.aborted) {\n\t\t\tbreak;\n\t\t}\n\t}\n\n\tconst orderedFinalizedCalls = await Promise.all(\n\t\tfinalizedCalls.map((entry) => (typeof entry === \"function\" ? entry() : Promise.resolve(entry))),\n\t);\n\tconst messages: ToolResultMessage[] = [];\n\tfor (const finalized of orderedFinalizedCalls) {\n\t\tconst toolResultMessage = createToolResultMessage(finalized);\n\t\tawait emitToolResultMessage(toolResultMessage, emit);\n\t\tmessages.push(toolResultMessage);\n\t}\n\n\treturn {\n\t\tmessages,\n\t\tterminate: shouldTerminateToolBatch(orderedFinalizedCalls),\n\t};\n}\n\ntype PreparedToolCall = {\n\tkind: \"prepared\";\n\ttoolCall: AgentToolCall;\n\ttool: AgentTool<any>;\n\targs: unknown;\n};\n\ntype ImmediateToolCallOutcome = {\n\tkind: \"immediate\";\n\tresult: AgentToolResult<any>;\n\tisError: boolean;\n};\n\ntype ExecutedToolCallOutcome = {\n\tresult: AgentToolResult<any>;\n\tisError: boolean;\n};\n\ntype FinalizedToolCallOutcome = {\n\ttoolCall: AgentToolCall;\n\tresult: AgentToolResult<any>;\n\tisError: boolean;\n};\n\ntype FinalizedToolCallEntry = FinalizedToolCallOutcome | (() => Promise<FinalizedToolCallOutcome>);\n\nfunction shouldTerminateToolBatch(finalizedCalls: FinalizedToolCallOutcome[]): boolean {\n\treturn finalizedCalls.length > 0 && finalizedCalls.every((finalized) => finalized.result.terminate === true);\n}\n\nfunction prepareToolCallArguments(tool: AgentTool<any>, toolCall: AgentToolCall): AgentToolCall {\n\tif (!tool.prepareArguments) {\n\t\treturn toolCall;\n\t}\n\tconst preparedArguments = tool.prepareArguments(toolCall.arguments);\n\tif (preparedArguments === toolCall.arguments) {\n\t\treturn toolCall;\n\t}\n\treturn {\n\t\t...toolCall,\n\t\targuments: preparedArguments as Record<string, any>,\n\t};\n}\n\nasync function prepareToolCall(\n\tcurrentContext: AgentContext,\n\tassistantMessage: AssistantMessage,\n\ttoolCall: AgentToolCall,\n\tconfig: AgentLoopConfig,\n\tsignal: AbortSignal | undefined,\n): Promise<PreparedToolCall | ImmediateToolCallOutcome> {\n\tconst tool = currentContext.tools?.find((t) => t.name === toolCall.name);\n\tif (!tool) {\n\t\treturn {\n\t\t\tkind: \"immediate\",\n\t\t\tresult: createErrorToolResult(`Tool ${toolCall.name} not found`),\n\t\t\tisError: true,\n\t\t};\n\t}\n\n\ttry {\n\t\tconst preparedToolCall = prepareToolCallArguments(tool, toolCall);\n\t\tconst validatedArgs = validateToolArguments(tool, preparedToolCall);\n\t\tif (config.beforeToolCall) {\n\t\t\tconst beforeResult = await config.beforeToolCall(\n\t\t\t\t{\n\t\t\t\t\tassistantMessage,\n\t\t\t\t\ttoolCall,\n\t\t\t\t\targs: validatedArgs,\n\t\t\t\t\tcontext: currentContext,\n\t\t\t\t},\n\t\t\t\tsignal,\n\t\t\t);\n\t\t\tif (signal?.aborted) {\n\t\t\t\treturn {\n\t\t\t\t\tkind: \"immediate\",\n\t\t\t\t\tresult: createErrorToolResult(\"Operation aborted\"),\n\t\t\t\t\tisError: true,\n\t\t\t\t};\n\t\t\t}\n\t\t\tif (beforeResult?.block) {\n\t\t\t\treturn {\n\t\t\t\t\tkind: \"immediate\",\n\t\t\t\t\tresult: createErrorToolResult(beforeResult.reason || \"Tool execution was blocked\"),\n\t\t\t\t\tisError: true,\n\t\t\t\t};\n\t\t\t}\n\t\t}\n\t\tif (signal?.aborted) {\n\t\t\treturn {\n\t\t\t\tkind: \"immediate\",\n\t\t\t\tresult: createErrorToolResult(\"Operation aborted\"),\n\t\t\t\tisError: true,\n\t\t\t};\n\t\t}\n\t\treturn {\n\t\t\tkind: \"prepared\",\n\t\t\ttoolCall,\n\t\t\ttool,\n\t\t\targs: validatedArgs,\n\t\t};\n\t} catch (error) {\n\t\treturn {\n\t\t\tkind: \"immediate\",\n\t\t\tresult: createErrorToolResult(error instanceof Error ? error.message : String(error)),\n\t\t\tisError: true,\n\t\t};\n\t}\n}\n\nasync function executePreparedToolCall(\n\tprepared: PreparedToolCall,\n\tsignal: AbortSignal | undefined,\n\temit: AgentEventSink,\n): Promise<ExecutedToolCallOutcome> {\n\tconst updateEvents: Promise<void>[] = [];\n\n\ttry {\n\t\tconst result = await prepared.tool.execute(\n\t\t\tprepared.toolCall.id,\n\t\t\tprepared.args as never,\n\t\t\tsignal,\n\t\t\t(partialResult) => {\n\t\t\t\tupdateEvents.push(\n\t\t\t\t\tPromise.resolve(\n\t\t\t\t\t\temit({\n\t\t\t\t\t\t\ttype: \"tool_execution_update\",\n\t\t\t\t\t\t\ttoolCallId: prepared.toolCall.id,\n\t\t\t\t\t\t\ttoolName: prepared.toolCall.name,\n\t\t\t\t\t\t\targs: prepared.toolCall.arguments,\n\t\t\t\t\t\t\tpartialResult,\n\t\t\t\t\t\t}),\n\t\t\t\t\t),\n\t\t\t\t);\n\t\t\t},\n\t\t);\n\t\tawait Promise.all(updateEvents);\n\t\treturn { result, isError: false };\n\t} catch (error) {\n\t\tawait Promise.all(updateEvents);\n\t\treturn {\n\t\t\tresult: createErrorToolResult(error instanceof Error ? error.message : String(error)),\n\t\t\tisError: true,\n\t\t};\n\t}\n}\n\nasync function finalizeExecutedToolCall(\n\tcurrentContext: AgentContext,\n\tassistantMessage: AssistantMessage,\n\tprepared: PreparedToolCall,\n\texecuted: ExecutedToolCallOutcome,\n\tconfig: AgentLoopConfig,\n\tsignal: AbortSignal | undefined,\n): Promise<FinalizedToolCallOutcome> {\n\tlet result = executed.result;\n\tlet isError = executed.isError;\n\n\tif (config.afterToolCall) {\n\t\ttry {\n\t\t\tconst afterResult = await config.afterToolCall(\n\t\t\t\t{\n\t\t\t\t\tassistantMessage,\n\t\t\t\t\ttoolCall: prepared.toolCall,\n\t\t\t\t\targs: prepared.args,\n\t\t\t\t\tresult,\n\t\t\t\t\tisError,\n\t\t\t\t\tcontext: currentContext,\n\t\t\t\t},\n\t\t\t\tsignal,\n\t\t\t);\n\t\t\tif (afterResult) {\n\t\t\t\tresult = {\n\t\t\t\t\tcontent: afterResult.content ?? result.content,\n\t\t\t\t\tdetails: afterResult.details ?? result.details,\n\t\t\t\t\tterminate: afterResult.terminate ?? result.terminate,\n\t\t\t\t};\n\t\t\t\tisError = afterResult.isError ?? isError;\n\t\t\t}\n\t\t} catch (error) {\n\t\t\tresult = createErrorToolResult(error instanceof Error ? error.message : String(error));\n\t\t\tisError = true;\n\t\t}\n\t}\n\n\treturn {\n\t\ttoolCall: prepared.toolCall,\n\t\tresult,\n\t\tisError,\n\t};\n}\n\nfunction createErrorToolResult(message: string): AgentToolResult<any> {\n\treturn {\n\t\tcontent: [{ type: \"text\", text: message }],\n\t\tdetails: {},\n\t};\n}\n\nasync function emitToolExecutionEnd(finalized: FinalizedToolCallOutcome, emit: AgentEventSink): Promise<void> {\n\tawait emit({\n\t\ttype: \"tool_execution_end\",\n\t\ttoolCallId: finalized.toolCall.id,\n\t\ttoolName: finalized.toolCall.name,\n\t\tresult: finalized.result,\n\t\tisError: finalized.isError,\n\t});\n}\n\nfunction createToolResultMessage(finalized: FinalizedToolCallOutcome): ToolResultMessage {\n\treturn {\n\t\trole: \"toolResult\",\n\t\ttoolCallId: finalized.toolCall.id,\n\t\ttoolName: finalized.toolCall.name,\n\t\tcontent: finalized.result.content,\n\t\tdetails: finalized.result.details,\n\t\tisError: finalized.isError,\n\t\ttimestamp: Date.now(),\n\t};\n}\n\nasync function emitToolResultMessage(toolResultMessage: ToolResultMessage, emit: AgentEventSink): Promise<void> {\n\tawait emit({ type: \"message_start\", message: toolResultMessage });\n\tawait emit({ type: \"message_end\", message: toolResultMessage });\n}\n"]}