| import { redactSecrets } from '@maka/core/redaction'; |
| import { |
| TASK_ID_MAX_CHARS, |
| isSafeTaskId, |
| projectAgentSwarmResult, |
| type ToolResultContent, |
| } from '@maka/core'; |
| import { z } from 'zod'; |
| import { |
| AGENT_WORKSPACE_SAME_WORKSPACE, |
| AGENT_WORKSPACE_WORKTREE, |
| AGENT_WRITE_BACK_PATCH, |
| AGENT_WRITE_BACK_SUMMARY, |
| BUILTIN_AGENT_PROFILES, |
| requireBuiltinAgentDefinitionByProfile, |
| type AgentDefinition, |
| } from './agent-catalog.js'; |
| import { |
| runAdaptiveSwarm, |
| type AdaptiveSwarmPolicy, |
| type AdaptiveSwarmItemResult, |
| } from './adaptive-swarm.js'; |
| import { |
| CHILD_AGENT_PROGRESS_BATCH_MAX_CHARS, |
| CHILD_AGENT_PROGRESS_BATCH_MAX_EVENTS, |
| ChildAgentProgressProjector, |
| createChildAgentProgressBudget, |
| } from './child-agent-progress.js'; |
| import type { SpawnChildAgentResult } from './session-manager.js'; |
| import type { SubagentExecutionRef } from './subagent-execution.js'; |
| import type { MakaTool, MakaToolContext } from './tool-runtime.js'; |
| |
| export const AGENT_SWARM_TOOL_NAME = 'agent_swarm'; |
| export const AGENT_SWARM_DEFAULT_CONCURRENCY = 3; |
| export const AGENT_SWARM_MAX_CONCURRENCY = 5; |
| export const AGENT_SWARM_MAX_ITEMS = 32; |
| export const AGENT_SWARM_PROMPT_TEMPLATE_PLACEHOLDER = '{{item}}'; |
| export const AGENT_SWARM_DEFAULT_ITEM_TIMEOUT_MS = 2 * 60 * 60 * 1_000; |
| |
| const AGENT_SWARM_WRITE_BACK_MODES = [AGENT_WRITE_BACK_SUMMARY, AGENT_WRITE_BACK_PATCH] as const; |
| const AGENT_SWARM_ISOLATION_MODES = [ |
| AGENT_WORKSPACE_SAME_WORKSPACE, |
| AGENT_WORKSPACE_WORKTREE, |
| ] as const; |
| const AGENT_SWARM_TASK_MAX_CHARS = 60_000; |
| const AGENT_SWARM_ERROR_MAX_CHARS = 1_000; |
| |
| export interface AgentSwarmExplicitItemInput { |
| item_id: string; |
| profile: string; |
| task: string; |
| write_back?: string; |
| isolation?: string; |
| } |
| |
| export interface AgentSwarmExplicitToolInput { |
| items: AgentSwarmExplicitItemInput[]; |
| resume_run_ids?: Record<string, string>; |
| max_concurrency?: number; |
| } |
| |
| export interface AgentSwarmTemplateToolInput { |
| prompt_template: string; |
| profile: string; |
| items: string[]; |
| resume_run_ids?: Record<string, string>; |
| max_concurrency?: number; |
| } |
| |
| export interface AgentSwarmResumeToolInput { |
| resume_run_ids: Record<string, string>; |
| max_concurrency?: number; |
| } |
| |
| export type AgentSwarmToolInput = |
| | AgentSwarmExplicitToolInput |
| | AgentSwarmTemplateToolInput |
| | AgentSwarmResumeToolInput; |
| |
| export type AgentSwarmToolResult = Extract<ToolResultContent, { kind: 'agent_swarm' }>; |
| |
| interface PreparedAgentSwarmItem { |
| readonly index: number; |
| readonly itemId: string; |
| readonly profile: string; |
| readonly task: string; |
| readonly definition: AgentDefinition; |
| readonly mode: 'spawn' | 'resume'; |
| readonly resumedFromRunId?: string; |
| readonly execution?: SubagentExecutionRef; |
| } |
| |
| interface PendingAgentSwarmResume { |
| readonly index: number; |
| readonly itemId: string; |
| readonly sourceRunId: string; |
| readonly task: string; |
| } |
| |
| interface StartedChildRef { |
| readonly childSessionId?: string; |
| readonly turnId: string; |
| readonly runId?: string; |
| readonly agentId: string; |
| readonly agentName: string; |
| } |
| |
| type ChildExecutionResult = SpawnChildAgentResult & { |
| readonly childSessionId?: string; |
| }; |
| |
| export function buildAgentSwarmTool( |
| deps: { |
| now?: () => number; |
| adaptiveSwarmPolicy?: AdaptiveSwarmPolicy; |
| itemTimeoutMs?: number; |
| } = {}, |
| ): MakaTool<AgentSwarmToolInput, AgentSwarmToolResult> { |
| const now = deps.now ?? Date.now; |
| const itemTimeoutMs = normalizeItemTimeoutMs( |
| deps.itemTimeoutMs ?? AGENT_SWARM_DEFAULT_ITEM_TIMEOUT_MS, |
| ); |
| return { |
| name: AGENT_SWARM_TOOL_NAME, |
| displayName: 'Agent Swarm', |
| description: [ |
| 'Run the same kind of bounded foreground child work over several independent items.', |
| `Provide either explicit structured items, or prompt_template with one shared profile and string items; every ${AGENT_SWARM_PROMPT_TEMPLATE_PLACEHOLDER} occurrence is replaced with the item value.`, |
| 'Use resume_run_ids to continue terminal child AgentRuns by runId; resumed children are ordered before new items.', |
| 'Use this only when every item can run independently. Results return in input order; you remain responsible for semantic synthesis.', |
| ].join(' '), |
| parameters: agentSwarmInputSchema(), |
| permissionRequired: true, |
| executionSemantics: 'exclusive_step', |
| categoryHint: 'subagent', |
| impl: async (input, ctx) => { |
| const prepared = await prepareAgentSwarmInput(input, ctx); |
| if (prepared.items.some((item) => item.mode === 'spawn') && !ctx.spawnChildSession) { |
| throw new Error('spawnChildSession capability is unavailable in this runtime context'); |
| } |
| if ( |
| prepared.items.some((item) => item.mode === 'resume') && |
| (!ctx.prepareChildAgentResume || !ctx.resumeChildAgent) |
| ) { |
| throw new Error('Child AgentRun resume capability is unavailable in this runtime context'); |
| } |
| |
| const startedAt = now(); |
| traceAgentSwarm(ctx, 'tool_started', 'batch_started', { |
| itemCount: prepared.items.length, |
| resumedItemCount: prepared.items.filter((item) => item.mode === 'resume').length, |
| maxConcurrency: prepared.maxConcurrency, |
| }); |
| for ( |
| let index = Math.min(prepared.maxConcurrency, prepared.items.length); |
| index < prepared.items.length; |
| index += 1 |
| ) { |
| const item = prepared.items[index]!; |
| traceAgentSwarm(ctx, 'tool_started', 'item_queued', { |
| itemId: item.itemId, |
| index: item.index, |
| profile: item.profile, |
| mode: item.mode, |
| ...(item.resumedFromRunId ? { resumedFromRunId: item.resumedFromRunId } : {}), |
| boundary: 'local_swarm_concurrency', |
| }); |
| } |
| const readyRefs: Array<StartedChildRef | undefined> = Array.from({ |
| length: prepared.items.length, |
| }); |
| const childResults: Array<ChildExecutionResult | undefined> = Array.from({ |
| length: prepared.items.length, |
| }); |
| const artifactIds = prepared.items.map(() => new Set<string>()); |
| const progressBudget = createChildAgentProgressBudget( |
| CHILD_AGENT_PROGRESS_BATCH_MAX_EVENTS, |
| CHILD_AGENT_PROGRESS_BATCH_MAX_CHARS, |
| ); |
| const progressProjectors = prepared.items.map( |
| (item) => |
| new ChildAgentProgressProjector(ctx, { |
| prefix: `Agent swarm item ${item.itemId} · child`, |
| sharedBudget: progressBudget, |
| }), |
| ); |
| const rows = await runAdaptiveSwarm< |
| PreparedAgentSwarmItem, |
| ChildExecutionResult, |
| { sourceRunId: string; execution?: SubagentExecutionRef } |
| >( |
| prepared.items, |
| async (item, { index, attempt, retry, markReady }) => { |
| const deadline = createItemDeadline(ctx.abortSignal, itemTimeoutMs); |
| traceAgentSwarm(ctx, 'tool_started', 'item_started', { |
| itemId: item.itemId, |
| index: item.index, |
| profile: item.profile, |
| mode: item.mode, |
| ...(item.resumedFromRunId ? { resumedFromRunId: item.resumedFromRunId } : {}), |
| attempt, |
| retry: retry !== undefined, |
| boundary: 'local_swarm_concurrency', |
| }); |
| ctx.emitOutput( |
| 'stdout', |
| `Agent swarm item ${item.itemId} ${retry ? 'retry' : 'started'}: ${item.definition.name}\n`, |
| ); |
| try { |
| const onReady = ({ |
| childSessionId, |
| turnId, |
| runId, |
| agentId, |
| agentName, |
| }: StartedChildRef) => { |
| readyRefs[index] = { |
| ...(childSessionId ? { childSessionId } : {}), |
| turnId, |
| ...(runId ? { runId } : {}), |
| agentId, |
| agentName, |
| }; |
| markReady(); |
| }; |
| const result: ChildExecutionResult = retry |
| ? ctx.retryChildAgent |
| ? ((await ctx.retryChildAgent({ |
| sourceRunId: retry.sourceRunId, |
| ...(retry.execution ? { execution: retry.execution } : {}), |
| abortSignal: deadline.signal, |
| onReady, |
| onEvent: (event) => progressProjectors[index]!.observe(event), |
| })) as SpawnChildAgentResult) |
| : (() => { |
| throw new Error('retryChildAgent capability is unavailable'); |
| })() |
| : item.mode === 'resume' |
| ? ((await ctx.resumeChildAgent!({ |
| sourceRunId: item.resumedFromRunId!, |
| prompt: item.task, |
| abortSignal: deadline.signal, |
| onReady, |
| onEvent: (event) => progressProjectors[index]!.observe(event), |
| })) as SpawnChildAgentResult) |
| : ((await ctx.spawnChildSession!({ |
| agentProfile: item.definition.profile, |
| prompt: item.task, |
| swarm: { |
| swarmId: ctx.toolCallId, |
| itemId: item.itemId, |
| }, |
| abortSignal: deadline.signal, |
| onReady, |
| onEvent: (event) => progressProjectors[index]!.observe(event), |
| })) as ChildExecutionResult); |
| const effectiveResult: ChildExecutionResult = deadline.timedOut() |
| ? timedOutChildResult(result, itemTimeoutMs) |
| : result; |
| for (const artifactId of effectiveResult.artifactIds) |
| artifactIds[index]!.add(artifactId); |
| const observedResult = { |
| ...effectiveResult, |
| artifactIds: [...artifactIds[index]!], |
| }; |
| childResults[index] = observedResult; |
| if ( |
| effectiveResult.status === 'failed' && |
| effectiveResult.failureClass === 'RateLimit' && |
| effectiveResult.runId && |
| ctx.retryChildAgent |
| ) { |
| return { |
| status: 'rate_limited' as const, |
| retry: { |
| sourceRunId: effectiveResult.runId, |
| ...(effectiveResult.childSessionId |
| ? { |
| execution: { |
| kind: 'child_session' as const, |
| sessionId: effectiveResult.childSessionId, |
| currentRunId: effectiveResult.runId, |
| }, |
| } |
| : {}), |
| }, |
| reason: new ProviderRateLimitRetry(effectiveResult), |
| }; |
| } |
| traceAgentSwarm( |
| ctx, |
| effectiveResult.status === 'failed' ? 'tool_failed' : 'tool_completed', |
| 'item_completed', |
| { |
| itemId: item.itemId, |
| index: item.index, |
| profile: item.profile, |
| mode: item.mode, |
| ...(item.resumedFromRunId ? { resumedFromRunId: item.resumedFromRunId } : {}), |
| status: effectiveResult.status, |
| ...(effectiveResult.childSessionId |
| ? { childSessionId: effectiveResult.childSessionId } |
| : {}), |
| turnId: effectiveResult.turnId, |
| ...(effectiveResult.runId ? { runId: effectiveResult.runId } : {}), |
| durationMs: effectiveResult.durationMs, |
| artifactCount: effectiveResult.artifactIds.length, |
| ...(effectiveResult.failureClass |
| ? { failureClass: effectiveResult.failureClass } |
| : {}), |
| }, |
| ); |
| ctx.emitOutput( |
| effectiveResult.status === 'failed' ? 'stderr' : 'stdout', |
| `Agent swarm item ${item.itemId}: ${effectiveResult.status}\n`, |
| ); |
| return { status: 'fulfilled' as const, value: observedResult }; |
| } catch (error) { |
| const effectiveError = deadline.timedOut() |
| ? new AgentSwarmItemTimeoutError(itemTimeoutMs) |
| : error; |
| traceAgentSwarm(ctx, 'tool_failed', 'item_completed', { |
| itemId: item.itemId, |
| index: item.index, |
| profile: item.profile, |
| mode: item.mode, |
| ...(item.resumedFromRunId ? { resumedFromRunId: item.resumedFromRunId } : {}), |
| status: ctx.abortSignal.aborted ? 'cancelled' : 'failed', |
| failureClass: boundedFailureClass(effectiveError, 'ChildAgentError'), |
| }); |
| ctx.emitOutput( |
| 'stderr', |
| `Agent swarm item ${item.itemId} failed: ${boundedSwarmError(effectiveError)}\n`, |
| ); |
| throw effectiveError; |
| } finally { |
| deadline.cleanup(); |
| } |
| }, |
| { |
| maxConcurrency: prepared.maxConcurrency, |
| signal: ctx.abortSignal, |
| ...(deps.adaptiveSwarmPolicy ? { policy: deps.adaptiveSwarmPolicy } : {}), |
| onRateLimit: ({ index, attempt, retryDelayMs, capacity }) => { |
| const item = prepared.items[index]!; |
| traceAgentSwarm(ctx, 'tool_started', 'item_suspended', { |
| itemId: item.itemId, |
| index, |
| profile: item.profile, |
| attempt, |
| retryDelayMs, |
| capacity, |
| failureClass: 'RateLimit', |
| }); |
| ctx.emitOutput( |
| 'stderr', |
| `Agent swarm item ${item.itemId} rate limited; retrying in ${retryDelayMs}ms\n`, |
| ); |
| }, |
| onCapacityChanged: ({ direction, capacity }) => { |
| traceAgentSwarm(ctx, 'tool_started', 'capacity_changed', { |
| direction, |
| capacity, |
| }); |
| }, |
| }, |
| ); |
| |
| const items = rows.map((row, index) => |
| mapAgentSwarmItem(prepared.items[index]!, row, readyRefs[index], childResults[index]), |
| ); |
| const completedAt = now(); |
| const status = aggregateAgentSwarmStatus(items); |
| ctx.emitOutput('stdout', `Agent swarm: ${status}\n`); |
| const result: AgentSwarmToolResult = { |
| kind: 'agent_swarm', |
| status, |
| items, |
| startedAt, |
| completedAt, |
| durationMs: Math.max(0, completedAt - startedAt), |
| }; |
| traceAgentSwarm(ctx, 'tool_completed', 'batch_completed', { |
| ...projectAgentSwarmResult(result), |
| resumedItemCount: prepared.items.filter((item) => item.mode === 'resume').length, |
| }); |
| return result; |
| }, |
| }; |
| } |
| |
| function traceAgentSwarm( |
| ctx: MakaToolContext, |
| type: 'tool_started' | 'tool_completed' | 'tool_failed', |
| stage: |
| | 'batch_started' |
| | 'item_queued' |
| | 'item_started' |
| | 'item_suspended' |
| | 'capacity_changed' |
| | 'item_completed' |
| | 'batch_completed', |
| data: Record<string, unknown>, |
| ): void { |
| ctx.emitRunTrace?.(type, `Agent swarm ${stage.replaceAll('_', ' ')}`, { |
| swarmStage: stage, |
| ...data, |
| }); |
| } |
| |
| function agentSwarmInputSchema() { |
| const itemSchema = z |
| .object({ |
| item_id: z |
| .string() |
| .min(1) |
| .max(TASK_ID_MAX_CHARS) |
| .refine(isSafeTaskId) |
| .describe('Stable item id (letters, digits, dot, underscore, colon, or dash).'), |
| profile: z.enum(BUILTIN_AGENT_PROFILES).describe('Child agent profile.'), |
| task: z |
| .string() |
| .min(1) |
| .max(AGENT_SWARM_TASK_MAX_CHARS) |
| .describe('Bounded, self-contained task for this item.'), |
| write_back: z |
| .enum(AGENT_SWARM_WRITE_BACK_MODES) |
| .optional() |
| .describe('Requested child write-back mode.'), |
| isolation: z |
| .enum(AGENT_SWARM_ISOLATION_MODES) |
| .optional() |
| .describe('Requested child workspace isolation.'), |
| }) |
| .superRefine((input, ctx) => { |
| addAgentContractIssues(input, ctx); |
| }); |
| |
| const explicitItemsSchema = z |
| .array(itemSchema) |
| .min(1) |
| .max(AGENT_SWARM_MAX_ITEMS) |
| .superRefine((items, ctx) => { |
| const seen = new Set<string>(); |
| for (let index = 0; index < items.length; index += 1) { |
| const itemId = items[index]!.item_id; |
| if (seen.has(itemId)) { |
| ctx.addIssue({ |
| code: z.ZodIssueCode.custom, |
| path: [index, 'item_id'], |
| message: `Duplicate agent swarm item_id "${itemId}".`, |
| }); |
| } |
| seen.add(itemId); |
| } |
| }); |
| const templateItemsSchema = z.array(z.string().trim().min(1)).min(1).max(AGENT_SWARM_MAX_ITEMS); |
| |
| return z |
| .object({ |
| items: z.union([explicitItemsSchema, templateItemsSchema]).optional(), |
| prompt_template: z |
| .string() |
| .trim() |
| .min(1) |
| .max(AGENT_SWARM_TASK_MAX_CHARS) |
| .optional() |
| .describe( |
| `Shared task template for string items; every ${AGENT_SWARM_PROMPT_TEMPLATE_PLACEHOLDER} occurrence is replaced.`, |
| ), |
| profile: z |
| .enum(BUILTIN_AGENT_PROFILES) |
| .optional() |
| .describe('Shared child profile for prompt_template string items.'), |
| resume_run_ids: z |
| .record(z.string().trim().min(1), z.string().trim().min(1).max(AGENT_SWARM_TASK_MAX_CHARS)) |
| .optional() |
| .describe('Map of terminal child AgentRun runId to its continuation prompt.'), |
| max_concurrency: z |
| .number() |
| .int() |
| .min(1) |
| .max(AGENT_SWARM_MAX_CONCURRENCY) |
| .default(AGENT_SWARM_DEFAULT_CONCURRENCY) |
| .describe('Maximum number of child items active inside this batch.'), |
| }) |
| .superRefine((input, ctx) => { |
| const resumeCount = Object.keys(input.resume_run_ids ?? {}).length; |
| const itemCount = input.items?.length ?? 0; |
| if (resumeCount + itemCount < 1) { |
| ctx.addIssue({ |
| code: z.ZodIssueCode.custom, |
| message: 'Agent swarm requires at least one item or resume_run_ids entry.', |
| }); |
| } |
| if (resumeCount + itemCount > AGENT_SWARM_MAX_ITEMS) { |
| ctx.addIssue({ |
| code: z.ZodIssueCode.custom, |
| message: `Agent swarm supports at most ${AGENT_SWARM_MAX_ITEMS} total items.`, |
| }); |
| } |
| |
| if (!input.items) { |
| if (input.prompt_template !== undefined) { |
| ctx.addIssue({ |
| code: z.ZodIssueCode.custom, |
| path: ['prompt_template'], |
| message: 'prompt_template requires string items.', |
| }); |
| } |
| if (input.profile !== undefined) { |
| ctx.addIssue({ |
| code: z.ZodIssueCode.custom, |
| path: ['profile'], |
| message: 'profile requires string items.', |
| }); |
| } |
| return; |
| } |
| |
| const templateItems = input.items.every((item) => typeof item === 'string'); |
| if (!templateItems) { |
| if (input.prompt_template !== undefined) { |
| ctx.addIssue({ |
| code: z.ZodIssueCode.custom, |
| path: ['prompt_template'], |
| message: 'prompt_template is only valid when items are strings.', |
| }); |
| } |
| if (input.profile !== undefined) { |
| ctx.addIssue({ |
| code: z.ZodIssueCode.custom, |
| path: ['profile'], |
| message: 'profile is specified per item when items are structured.', |
| }); |
| } |
| return; |
| } |
| |
| if (input.prompt_template === undefined) { |
| ctx.addIssue({ |
| code: z.ZodIssueCode.custom, |
| path: ['prompt_template'], |
| message: 'prompt_template is required when items are strings.', |
| }); |
| return; |
| } |
| if (input.profile === undefined) { |
| ctx.addIssue({ |
| code: z.ZodIssueCode.custom, |
| path: ['profile'], |
| message: 'profile is required when items are strings.', |
| }); |
| } |
| if (!input.prompt_template.includes(AGENT_SWARM_PROMPT_TEMPLATE_PLACEHOLDER)) { |
| ctx.addIssue({ |
| code: z.ZodIssueCode.custom, |
| path: ['prompt_template'], |
| message: `prompt_template must include ${AGENT_SWARM_PROMPT_TEMPLATE_PLACEHOLDER}.`, |
| }); |
| return; |
| } |
| |
| const seenTasks = new Set<string>(); |
| for (let index = 0; index < input.items.length; index += 1) { |
| const item = input.items[index]; |
| if (typeof item !== 'string') continue; |
| const task = expandAgentSwarmPromptTemplate(input.prompt_template, item); |
| if (task.length > AGENT_SWARM_TASK_MAX_CHARS) { |
| ctx.addIssue({ |
| code: z.ZodIssueCode.custom, |
| path: ['items', index], |
| message: `Expanded agent swarm task exceeds ${AGENT_SWARM_TASK_MAX_CHARS} characters.`, |
| }); |
| } |
| if (seenTasks.has(task)) { |
| ctx.addIssue({ |
| code: z.ZodIssueCode.custom, |
| path: ['items', index], |
| message: 'Template items must produce distinct agent swarm tasks.', |
| }); |
| } |
| seenTasks.add(task); |
| } |
| }); |
| } |
| |
| function addAgentContractIssues(input: AgentSwarmExplicitItemInput, ctx: z.RefinementCtx): void { |
| const definition = requireBuiltinAgentDefinitionByProfile(input.profile); |
| const writeBack = input.write_back ?? definition.contract.defaultWriteBack; |
| if (!definition.contract.supportedWriteBack.some((mode) => mode === writeBack)) { |
| ctx.addIssue({ |
| code: z.ZodIssueCode.custom, |
| path: ['write_back'], |
| message: `Agent profile "${definition.profile}" does not support write_back "${writeBack}".`, |
| }); |
| } |
| const isolation = input.isolation ?? definition.contract.workspace; |
| if (isolation !== definition.contract.workspace) { |
| ctx.addIssue({ |
| code: z.ZodIssueCode.custom, |
| path: ['isolation'], |
| message: `Agent profile "${definition.profile}" requires isolation "${definition.contract.workspace}", not "${isolation}".`, |
| }); |
| } |
| } |
| |
| async function prepareAgentSwarmInput( |
| input: AgentSwarmToolInput, |
| ctx: MakaToolContext, |
| ): Promise<{ |
| readonly items: readonly PreparedAgentSwarmItem[]; |
| readonly maxConcurrency: number; |
| }> { |
| const preflight = preflightAgentSwarmInput(input); |
| if (preflight.items.length > 0 && !ctx.spawnChildSession) { |
| throw new Error('spawnChildSession capability is unavailable in this runtime context'); |
| } |
| if (preflight.resumes.length > 0 && (!ctx.prepareChildAgentResume || !ctx.resumeChildAgent)) { |
| throw new Error('Child AgentRun resume capability is unavailable in this runtime context'); |
| } |
| const resumes = await Promise.all( |
| preflight.resumes.map(async (item): Promise<PreparedAgentSwarmItem> => { |
| const prepared = await ctx.prepareChildAgentResume!(item.sourceRunId); |
| if (prepared.sourceRunId !== item.sourceRunId) { |
| throw new Error(`Child AgentRun resume identity changed for ${item.sourceRunId}`); |
| } |
| const definition = requireBuiltinAgentDefinitionByProfile(prepared.profile); |
| if (definition.id !== prepared.agentId || definition.name !== prepared.agentName) { |
| throw new Error(`Child AgentRun resume profile changed for ${item.sourceRunId}`); |
| } |
| return { |
| index: item.index, |
| itemId: item.itemId, |
| profile: definition.profile, |
| task: item.task, |
| definition, |
| mode: 'resume', |
| resumedFromRunId: item.sourceRunId, |
| execution: prepared.execution, |
| }; |
| }), |
| ); |
| const linkedChildSessions = new Set<string>(); |
| for (const resume of resumes) { |
| if (resume.execution?.kind !== 'child_session') continue; |
| if (linkedChildSessions.has(resume.execution.sessionId)) { |
| throw new Error( |
| `Agent swarm cannot resume child Session ${resume.execution.sessionId} more than once`, |
| ); |
| } |
| linkedChildSessions.add(resume.execution.sessionId); |
| } |
| return { |
| items: [...resumes, ...preflight.items], |
| maxConcurrency: preflight.maxConcurrency, |
| }; |
| } |
| |
| function preflightAgentSwarmInput(input: AgentSwarmToolInput): { |
| readonly items: readonly PreparedAgentSwarmItem[]; |
| readonly resumes: readonly PendingAgentSwarmResume[]; |
| readonly maxConcurrency: number; |
| } { |
| const resumeEntries = Object.entries(input.resume_run_ids ?? {}); |
| const explicitItems = normalizeAgentSwarmItems(input); |
| const totalItems = resumeEntries.length + explicitItems.length; |
| if (totalItems < 1) { |
| throw new Error('Agent swarm requires at least one item or resume_run_ids entry.'); |
| } |
| if (totalItems > AGENT_SWARM_MAX_ITEMS) { |
| throw new Error(`Agent swarm supports at most ${AGENT_SWARM_MAX_ITEMS} total items.`); |
| } |
| const maxConcurrency = input.max_concurrency ?? AGENT_SWARM_DEFAULT_CONCURRENCY; |
| if ( |
| !Number.isSafeInteger(maxConcurrency) || |
| maxConcurrency < 1 || |
| maxConcurrency > AGENT_SWARM_MAX_CONCURRENCY |
| ) { |
| throw new Error( |
| `Agent swarm max_concurrency must be an integer from 1 to ${AGENT_SWARM_MAX_CONCURRENCY}.`, |
| ); |
| } |
| |
| const resumes = resumeEntries.map(([sourceRunId, prompt], index): PendingAgentSwarmResume => { |
| if (sourceRunId.trim().length < 1) { |
| throw new Error(`Agent swarm resume entry ${index} has an invalid runId.`); |
| } |
| if ( |
| typeof prompt !== 'string' || |
| prompt.trim().length < 1 || |
| prompt.trim().length > AGENT_SWARM_TASK_MAX_CHARS |
| ) { |
| throw new Error(`Agent swarm resume entry ${sourceRunId} has an invalid prompt.`); |
| } |
| return { |
| index, |
| itemId: `resume-${index + 1}`, |
| sourceRunId: sourceRunId.trim(), |
| task: prompt.trim(), |
| }; |
| }); |
| const seen = new Set<string>(); |
| const items = explicitItems.map((item, index): PreparedAgentSwarmItem => { |
| if (!isSafeTaskId(item.item_id)) { |
| throw new Error(`Agent swarm item ${index} has an invalid item_id.`); |
| } |
| if (seen.has(item.item_id)) { |
| throw new Error(`Duplicate agent swarm item_id "${item.item_id}".`); |
| } |
| seen.add(item.item_id); |
| if ( |
| typeof item.task !== 'string' || |
| item.task.length < 1 || |
| item.task.length > AGENT_SWARM_TASK_MAX_CHARS |
| ) { |
| throw new Error(`Agent swarm item "${item.item_id}" has an invalid task.`); |
| } |
| |
| const definition = requireBuiltinAgentDefinitionByProfile(item.profile); |
| const writeBack = item.write_back ?? definition.contract.defaultWriteBack; |
| if (!definition.contract.supportedWriteBack.some((mode) => mode === writeBack)) { |
| throw new Error( |
| `Agent profile "${definition.profile}" does not support write_back "${writeBack}".`, |
| ); |
| } |
| const isolation = item.isolation ?? definition.contract.workspace; |
| if (isolation !== definition.contract.workspace) { |
| throw new Error( |
| `Agent profile "${definition.profile}" requires isolation "${definition.contract.workspace}", not "${isolation}".`, |
| ); |
| } |
| return { |
| index: resumes.length + index, |
| itemId: item.item_id, |
| profile: definition.profile, |
| task: item.task, |
| definition, |
| mode: 'spawn', |
| }; |
| }); |
| return { items, resumes, maxConcurrency }; |
| } |
| |
| function normalizeAgentSwarmItems(input: AgentSwarmToolInput): AgentSwarmExplicitItemInput[] { |
| if (!('items' in input) || !input.items) { |
| if ('prompt_template' in input || 'profile' in input) { |
| throw new Error('prompt_template and shared profile require string items.'); |
| } |
| return []; |
| } |
| const stringItemCount = input.items.filter((item) => typeof item === 'string').length; |
| if (stringItemCount === 0) { |
| if ('prompt_template' in input || 'profile' in input) { |
| throw new Error('prompt_template and shared profile are only valid when items are strings.'); |
| } |
| return input.items; |
| } |
| if (stringItemCount !== input.items.length) { |
| throw new Error('Agent swarm items must be either all structured items or all strings.'); |
| } |
| if (!('prompt_template' in input) || typeof input.prompt_template !== 'string') { |
| throw new Error('prompt_template is required when agent swarm items are strings.'); |
| } |
| if (!('profile' in input) || typeof input.profile !== 'string') { |
| throw new Error('profile is required when agent swarm items are strings.'); |
| } |
| |
| const promptTemplate = input.prompt_template.trim(); |
| if (!promptTemplate.includes(AGENT_SWARM_PROMPT_TEMPLATE_PLACEHOLDER)) { |
| throw new Error(`prompt_template must include ${AGENT_SWARM_PROMPT_TEMPLATE_PLACEHOLDER}.`); |
| } |
| const seenTasks = new Set<string>(); |
| return input.items.map((rawItem, index) => { |
| const item = rawItem.trim(); |
| if (item.length < 1) { |
| throw new Error(`Agent swarm template item ${index} must not be empty.`); |
| } |
| const task = expandAgentSwarmPromptTemplate(promptTemplate, item); |
| if (task.length > AGENT_SWARM_TASK_MAX_CHARS) { |
| throw new Error( |
| `Expanded agent swarm task ${index} exceeds ${AGENT_SWARM_TASK_MAX_CHARS} characters.`, |
| ); |
| } |
| if (seenTasks.has(task)) { |
| throw new Error(`Agent swarm template item ${index} produces a duplicate task.`); |
| } |
| seenTasks.add(task); |
| return { |
| item_id: `item-${index + 1}`, |
| profile: input.profile, |
| task, |
| }; |
| }); |
| } |
| |
| function expandAgentSwarmPromptTemplate(promptTemplate: string, item: string): string { |
| return promptTemplate.split(AGENT_SWARM_PROMPT_TEMPLATE_PLACEHOLDER).join(item); |
| } |
| |
| function mapAgentSwarmItem( |
| item: PreparedAgentSwarmItem, |
| row: AdaptiveSwarmItemResult<ChildExecutionResult>, |
| ready: StartedChildRef | undefined, |
| observed: ChildExecutionResult | undefined, |
| ): AgentSwarmToolResult['items'][number] { |
| if (row.status === 'fulfilled') { |
| return mapChildResult( |
| item, |
| row.value, |
| row.value.status === 'cancelled' |
| ? 'cancelled' |
| : row.value.status === 'completed' |
| ? 'completed' |
| : 'failed', |
| ); |
| } |
| if (row.status === 'rejected') { |
| if (observed) { |
| return mapChildResult(item, observed, 'failed'); |
| } |
| return { |
| itemId: item.itemId, |
| index: row.index, |
| profile: item.profile, |
| started: ready !== undefined, |
| ...(item.resumedFromRunId ? { resumedFromRunId: item.resumedFromRunId } : {}), |
| ...(ready ?? {}), |
| status: 'failed', |
| summary: boundedSwarmError(row.reason), |
| artifactIds: [], |
| failureClass: boundedFailureClass(row.reason, 'ChildAgentError'), |
| }; |
| } |
| if (observed) { |
| return mapChildResult(item, observed, 'cancelled'); |
| } |
| return { |
| itemId: item.itemId, |
| index: row.index, |
| profile: item.profile, |
| started: ready !== undefined, |
| ...(item.resumedFromRunId ? { resumedFromRunId: item.resumedFromRunId } : {}), |
| ...(ready ?? {}), |
| status: 'cancelled', |
| summary: ready |
| ? 'Child run was cancelled with its parent swarm.' |
| : 'Item was cancelled before its child run started.', |
| artifactIds: [], |
| failureClass: 'ParentCancelled', |
| }; |
| } |
| |
| class ProviderRateLimitRetry extends Error { |
| constructor(readonly result: SpawnChildAgentResult) { |
| super(result.summary || 'Child agent provider rate limited'); |
| this.name = 'RateLimit'; |
| } |
| } |
| |
| class AgentSwarmItemTimeoutError extends Error { |
| readonly failureClass = 'Timeout'; |
| |
| constructor(readonly timeoutMs: number) { |
| super(`Child agent timed out after ${formatDuration(timeoutMs)}.`); |
| this.name = 'Timeout'; |
| } |
| } |
| |
| function normalizeItemTimeoutMs(value: number): number { |
| if (!Number.isSafeInteger(value) || value < 0) { |
| throw new Error('Agent swarm item timeout must be a non-negative integer in milliseconds.'); |
| } |
| return value; |
| } |
| |
| function createItemDeadline( |
| parentSignal: AbortSignal, |
| timeoutMs: number, |
| ): { |
| readonly signal: AbortSignal; |
| timedOut(): boolean; |
| cleanup(): void; |
| } { |
| if (timeoutMs === 0) { |
| return { signal: parentSignal, timedOut: () => false, cleanup: () => {} }; |
| } |
| const controller = new AbortController(); |
| let expired = false; |
| const abortFromParent = () => controller.abort(parentSignal.reason); |
| if (parentSignal.aborted) abortFromParent(); |
| else parentSignal.addEventListener('abort', abortFromParent, { once: true }); |
| const timer = setTimeout(() => { |
| if (controller.signal.aborted) return; |
| expired = true; |
| controller.abort(new AgentSwarmItemTimeoutError(timeoutMs)); |
| }, timeoutMs); |
| return { |
| signal: controller.signal, |
| timedOut: () => expired, |
| cleanup: () => { |
| clearTimeout(timer); |
| parentSignal.removeEventListener('abort', abortFromParent); |
| }, |
| }; |
| } |
| |
| function timedOutChildResult( |
| result: ChildExecutionResult, |
| timeoutMs: number, |
| ): ChildExecutionResult { |
| return { |
| ...result, |
| status: 'failed', |
| summary: `Child agent timed out after ${formatDuration(timeoutMs)}.`, |
| failureClass: 'Timeout', |
| }; |
| } |
| |
| function formatDuration(ms: number): string { |
| if (ms % 3_600_000 === 0) { |
| const hours = ms / 3_600_000; |
| return `${hours} hour${hours === 1 ? '' : 's'}`; |
| } |
| if (ms % 60_000 === 0) { |
| const minutes = ms / 60_000; |
| return `${minutes} minute${minutes === 1 ? '' : 's'}`; |
| } |
| if (ms % 1_000 === 0) { |
| const seconds = ms / 1_000; |
| return `${seconds} second${seconds === 1 ? '' : 's'}`; |
| } |
| return `${ms} ms`; |
| } |
| |
| function mapChildResult( |
| item: PreparedAgentSwarmItem, |
| result: ChildExecutionResult, |
| status: AgentSwarmToolResult['items'][number]['status'], |
| ): AgentSwarmToolResult['items'][number] { |
| return { |
| itemId: item.itemId, |
| index: item.index, |
| profile: item.profile, |
| started: true, |
| agentId: result.agentId, |
| agentName: result.agentName, |
| ...(result.childSessionId ? { childSessionId: result.childSessionId } : {}), |
| turnId: result.turnId, |
| ...(result.runId ? { runId: result.runId } : {}), |
| ...(item.resumedFromRunId ? { resumedFromRunId: item.resumedFromRunId } : {}), |
| status, |
| summary: result.summary, |
| artifactIds: result.artifactIds, |
| startedAt: result.startedAt, |
| completedAt: result.completedAt, |
| durationMs: result.durationMs, |
| ...(result.failureClass ? { failureClass: result.failureClass } : {}), |
| }; |
| } |
| |
| function aggregateAgentSwarmStatus( |
| items: AgentSwarmToolResult['items'], |
| ): AgentSwarmToolResult['status'] { |
| if (items.some((item) => item.status === 'cancelled')) return 'cancelled'; |
| if (items.every((item) => item.status === 'completed')) return 'completed'; |
| return 'partial'; |
| } |
| |
| function boundedSwarmError(error: unknown): string { |
| const message = redactSecrets( |
| error instanceof Error ? error.message : String(error ?? 'unknown error'), |
| ); |
| return message.length <= AGENT_SWARM_ERROR_MAX_CHARS |
| ? message |
| : `${message.slice(0, AGENT_SWARM_ERROR_MAX_CHARS - 1)}…`; |
| } |
| |
| function boundedFailureClass(error: unknown, fallback: string): string { |
| const value = error instanceof Error && error.name.trim() ? error.name : fallback; |
| return boundedSwarmError(value); |
| } |
