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Claude Code — Services, Context, State & Screens

This document exhaustively covers all files in src/services/, src/context/, src/bootstrap/state.ts, src/coordinator/, src/server/, and src/screens/. Every exported symbol is listed with its full signature, key logic, configuration, and dependencies.

bootstrap/state.ts
coordinator/coordinatorMode.ts
server/types.ts
server/createDirectConnectSession.ts
server/directConnectManager.ts
services/analytics/config.ts
services/analytics/growthbook.ts
services/analytics/metadata.ts
services/analytics/index.ts
services/analytics/sink.ts
services/analytics/sinkKillswitch.ts
services/analytics/datadog.ts
services/analytics/firstPartyEventLogger.ts
services/analytics/firstPartyEventLoggingExporter.ts
services/api/bootstrap.ts
services/api/client.ts
services/api/claude.ts
services/api/dumpPrompts.ts
services/api/emptyUsage.ts
services/api/errorUtils.ts
services/api/errors.ts
services/api/filesApi.ts
services/api/firstTokenDate.ts
services/api/grove.ts
services/api/logging.ts
services/api/metricsOptOut.ts
services/api/overageCreditGrant.ts
services/api/promptCacheBreakDetection.ts
services/api/referral.ts
services/api/sessionIngress.ts
services/api/ultrareviewQuota.ts
services/api/usage.ts
services/api/withRetry.ts
services/AgentSummary/agentSummary.ts
services/autoDream/autoDream.ts
services/autoDream/config.ts
services/autoDream/consolidationLock.ts
services/autoDream/consolidationPrompt.ts
services/awaySummary.ts
services/claudeAiLimits.ts
services/claudeAiLimitsHook.ts
services/compact/apiMicrocompact.ts
services/compact/autoCompact.ts
services/compact/compact.ts
services/compact/compactWarningHook.ts
services/compact/compactWarningState.ts
services/compact/grouping.ts
services/compact/microCompact.ts
services/compact/postCompactCleanup.ts
services/compact/prompt.ts
services/compact/sessionMemoryCompact.ts
services/compact/timeBasedMCConfig.ts
services/diagnosticTracking.ts
services/internalLogging.ts
services/MagicDocs/magicDocs.ts
services/MagicDocs/prompts.ts
services/mcpServerApproval.tsx
services/mockRateLimits.ts
services/MCP (mcp/)
services/notifier.ts
services/preventSleep.ts
services/PromptSuggestion/promptSuggestion.ts
services/PromptSuggestion/speculation.ts
services/rateLimitMocking.ts
services/rateLimitMessages.ts
services/SessionMemory/prompts.ts
services/SessionMemory/sessionMemory.ts
services/SessionMemory/sessionMemoryUtils.ts
services/tokenEstimation.ts
services/vcr.ts
services/voice.ts
services/voiceKeyterms.ts
services/voiceStreamSTT.ts
context/QueuedMessageContext.tsx
context/fpsMetrics.tsx
context/mailbox.tsx
context/modalContext.tsx
context/notifications.tsx
context/overlayContext.tsx
context/promptOverlayContext.tsx
context/stats.tsx
context/voice.tsx
screens/Doctor.tsx
screens/REPL.tsx
screens/ResumeConversation.tsx

bootstrap/state.ts

Path: src/bootstrap/state.ts

Purpose: The single global session state singleton for the entire Claude Code process. Acts as the authoritative source of truth for all per-session metrics, model configuration, telemetry handles, and feature flags. Designed as a strict leaf in the import DAG — imports nothing from src/utils/ except via explicit safe indirection.

Key Types Exported:

export type ChannelEntry =
  | { kind: 'plugin'; name: string; marketplace: string; dev?: boolean }
  | { kind: 'server'; name: string; dev?: boolean }

export type AttributedCounter = {
  add(value: number, additionalAttributes?: Attributes): void
}

State Type (internal, not exported directly): Contains ~80 fields including:

originalCwd: string — resolved cwd at process start (NFC-normalized, symlinks resolved)
projectRoot: string — stable identity root (set at startup, never changed by mid-session EnterWorktreeTool)
totalCostUSD: number, totalAPIDuration: number, totalAPIDurationWithoutRetries: number
totalToolDuration: number, turnHookDurationMs: number, turnToolDurationMs: number
totalLinesAdded: number, totalLinesRemoved: number
cwd: string — current working directory (mutable, changes with shell.ts setCwd)
modelUsage: { [modelName: string]: ModelUsage } — per-model usage tracking
mainLoopModelOverride: ModelSetting | undefined, initialMainLoopModel: ModelSetting
sessionId: SessionId — UUID regenerated on clearConversation
parentSessionId: SessionId | undefined — previous session (for lineage tracking)
isInteractive: boolean, kairosActive: boolean, strictToolResultPairing: boolean
sdkAgentProgressSummariesEnabled: boolean, userMsgOptIn: boolean
clientType: string (default 'cli'), sessionSource: string | undefined
meter: Meter | null, sessionCounter, locCounter, prCounter, commitCounter, costCounter, tokenCounter, codeEditToolDecisionCounter, activeTimeCounter — OTel metrics
sessionId: SessionId (randomUUID at init), parentSessionId: SessionId | undefined
loggerProvider: LoggerProvider | null, eventLogger: ReturnType<typeof logs.getLogger> | null
meterProvider: MeterProvider | null, tracerProvider: BasicTracerProvider | null
agentColorMap: Map<string, AgentColorName>, agentColorIndex: number
lastAPIRequest, lastAPIRequestMessages, lastClassifierRequests, cachedClaudeMdContent
inMemoryErrorLog: Array<{ error: string; timestamp: string }>
inlinePlugins: string[], chromeFlagOverride: boolean | undefined
sessionBypassPermissionsMode: boolean, scheduledTasksEnabled: boolean
sessionCronTasks: SessionCronTask[], sessionCreatedTeams: Set<string>
sessionTrustAccepted: boolean, sessionPersistenceDisabled: boolean
hasExitedPlanMode: boolean, needsPlanModeExitAttachment: boolean, needsAutoModeExitAttachment: boolean
initJsonSchema: Record<string, unknown> | null, registeredHooks: Partial<Record<HookEvent, RegisteredHookMatcher[]>> | null
planSlugCache: Map<string, string> — sessionId → wordSlug
teleportedSessionInfo: { isTeleported, hasLoggedFirstMessage, sessionId } | null
invokedSkills: Map<string, { skillName, skillPath, content, invokedAt, agentId }> — keyed by "${agentId ?? ''}:${skillName}"
slowOperations: Array<{ operation, durationMs, timestamp }> — ant-only dev bar
sdkBetas: string[] | undefined, mainThreadAgentType: string | undefined
isRemoteMode: boolean, directConnectServerUrl: string | undefined
systemPromptSectionCache: Map<string, string | null>, lastEmittedDate: string | null
additionalDirectoriesForClaudeMd: string[], allowedChannels: ChannelEntry[], hasDevChannels: boolean
sessionProjectDir: string | null — transcript directory override
promptCache1hAllowlist: string[] | null, promptCache1hEligible: boolean | null
afkModeHeaderLatched: boolean | null, fastModeHeaderLatched: boolean | null
cacheEditingHeaderLatched: boolean | null, thinkingClearLatched: boolean | null
promptId: string | null, lastMainRequestId: string | undefined
lastApiCompletionTimestamp: number | null, pendingPostCompaction: boolean

Exported Functions (getters/setters/mutators):

export function getSessionId(): SessionId
export function regenerateSessionId(options?: { setCurrentAsParent?: boolean }): SessionId
export function getParentSessionId(): SessionId | undefined
export function switchSession(sessionId: SessionId, projectDir?: string | null): void
export const onSessionSwitch: Signal<[id: SessionId]>['subscribe']
export function getSessionProjectDir(): string | null
export function getOriginalCwd(): string
export function getProjectRoot(): string
export function setOriginalCwd(cwd: string): void
export function setProjectRoot(cwd: string): void  // --worktree startup only
export function getCwdState(): string
export function setCwdState(cwd: string): void
export function getDirectConnectServerUrl(): string | undefined
export function setDirectConnectServerUrl(url: string): void
export function addToTotalDurationState(duration: number, durationWithoutRetries: number): void
export function resetTotalDurationStateAndCost_FOR_TESTS_ONLY(): void
export function addToTotalCostState(cost: number, modelUsage: ModelUsage, model: string): void
export function getTotalCostUSD(): number
export function getTotalAPIDuration(): number
export function getTotalDuration(): number
export function getTotalAPIDurationWithoutRetries(): number
export function getTotalToolDuration(): number
export function addToToolDuration(duration: number): void
export function getTurnHookDurationMs(): number
export function addToTurnHookDuration(duration: number): void
export function resetTurnHookDuration(): void
export function getTurnHookCount(): number
export function getTurnToolDurationMs(): number
export function resetTurnToolDuration(): void
export function getTurnToolCount(): number
export function getTurnClassifierDurationMs(): number
export function addToTurnClassifierDuration(duration: number): void
export function resetTurnClassifierDuration(): void
export function getTurnClassifierCount(): number
export function getStatsStore(): { observe(name: string, value: number): void } | null
export function setStatsStore(store: { observe(name: string, value: number): void } | null): void
export function updateLastInteractionTime(immediate?: boolean): void
export function flushInteractionTime(): void
export function addToTotalLinesChanged(added: number, removed: number): void
export function getTotalLinesAdded(): number
export function getTotalLinesRemoved(): number
export function getTotalInputTokens(): number
export function getTotalOutputTokens(): number
export function getTotalCacheReadInputTokens(): number
export function getTotalCacheCreationInputTokens(): number
export function getTotalWebSearchRequests(): number
export function getTurnOutputTokens(): number
export function getCurrentTurnTokenBudget(): number | null
export function snapshotOutputTokensForTurn(budget: number | null): void
export function getBudgetContinuationCount(): number
export function incrementBudgetContinuationCount(): void
export function setHasUnknownModelCost(): void
export function hasUnknownModelCost(): boolean
export function getLastMainRequestId(): string | undefined
export function setLastMainRequestId(requestId: string): void
export function getLastApiCompletionTimestamp(): number | null
export function setLastApiCompletionTimestamp(timestamp: number): void
export function markPostCompaction(): void
export function consumePostCompaction(): boolean
export function getLastInteractionTime(): number
export function markScrollActivity(): void
export function getIsScrollDraining(): boolean
export function waitForScrollIdle(): Promise<void>
export function getModelUsage(): { [modelName: string]: ModelUsage }
export function getUsageForModel(model: string): ModelUsage | undefined
export function getMainLoopModelOverride(): ModelSetting | undefined
export function getInitialMainLoopModel(): ModelSetting
export function setMainLoopModelOverride(model: ModelSetting | undefined): void
// ... and many more setters for isInteractive, clientType, sessionSource, telemetry counters, etc.

Key Logic:

STATE is a module-level singleton initialized via getInitialState() on import
updateLastInteractionTime(immediate?): deferred by default (batches keypresses into single Date.now() per Ink render); pass immediate=true for post-render useEffect callbacks
flushInteractionTime(): called by Ink before each render cycle
Scroll drain: markScrollActivity() sets a debounce flag (scrollDraining) for 150ms; background intervals call getIsScrollDraining() to yield; waitForScrollIdle() polls with 150ms intervals
switchSession() atomically updates sessionId + sessionProjectDir; emits sessionSwitched signal
regenerateSessionId() can optionally set current as parent (used for plan mode → implementation lineage)
markPostCompaction() / consumePostCompaction(): one-shot latch, auto-resets after first consumption

Configuration:

SCROLL_DRAIN_IDLE_MS = 150
RESERVOIR_SIZE (histogram sampling) = 1024 (in stats.tsx)

Dependencies: @anthropic-ai/sdk, @opentelemetry/api, @opentelemetry/sdk-*, src/utils/crypto.js, src/utils/signal.js, src/utils/settings/settingsCache.js, src/types/ids.js

coordinator/coordinatorMode.ts

Path: src/coordinator/coordinatorMode.ts

Purpose: Implements multi-worker "coordinator mode" where Claude Code orchestrates multiple parallel subagents. Provides the system prompt, user context injection, mode detection, and session-resume alignment logic.

Exports:

export function isCoordinatorMode(): boolean
export function matchSessionMode(
  sessionMode: 'coordinator' | 'normal' | undefined
): string | undefined
export function getCoordinatorUserContext(
  mcpClients: ReadonlyArray<{ name: string }>,
  scratchpadDir?: string
): { [k: string]: string }
export function getCoordinatorSystemPrompt(): string

Key Logic:

isCoordinatorMode(): reads CLAUDE_CODE_COORDINATOR_MODE env var; only active when feature('COORDINATOR_MODE') bundle flag is set
matchSessionMode(): when resuming a session, aligns the current coordinator mode with the stored session mode. Flips process.env.CLAUDE_CODE_COORDINATOR_MODE in-place (since isCoordinatorMode() reads it live). Returns a user-visible warning message if mode was switched, undefined if no change needed. Logs tengu_coordinator_mode_switched analytics event
getCoordinatorUserContext(): returns { workerToolsContext: string } with worker tool list, MCP server names, and scratchpad directory (if gate tengu_scratch enabled). In CLAUDE_CODE_SIMPLE mode, limits worker tools to Bash/Read/Edit
getCoordinatorSystemPrompt(): returns a multi-section system prompt (1500+ chars) describing coordinator role, available tools (Agent, SendMessage, TaskStop), task workflow phases (Research → Synthesis → Implementation → Verification), concurrency strategy, worker prompt writing guidelines, and full example session

Internal Constants:

const INTERNAL_WORKER_TOOLS = new Set([
  TEAM_CREATE_TOOL_NAME,
  TEAM_DELETE_TOOL_NAME,
  SEND_MESSAGE_TOOL_NAME,
  SYNTHETIC_OUTPUT_TOOL_NAME,
])

Configuration:

COORDINATOR_MODE bundle feature flag
CLAUDE_CODE_COORDINATOR_MODE env var
CLAUDE_CODE_SIMPLE env var — restricts worker tool set to Bash/Read/Edit
GrowthBook gate tengu_scratch — enables scratchpad directory context

Dependencies: bun:bundle, constants/tools.js, services/analytics/growthbook.js, services/analytics/index.js, various tool name constants, utils/envUtils.js

server/types.ts

Path: src/server/types.ts

Purpose: Shared type definitions for the Claude Code server (direct-connect mode). Provides the Zod validation schema for session creation responses.

Exports:

export const connectResponseSchema: () => ZodObject<{
  session_id: ZodString
  ws_url: ZodString
  work_dir: ZodString.optional()
}>

export type ServerConfig = {
  port: number
  host?: string
  authToken?: string
}

export type SessionState = 'starting' | 'running' | 'detached' | 'stopping' | 'stopped'

export type SessionInfo = {
  sessionId: string
  state: SessionState
  wsUrl: string
  workDir?: string
  createdAt: number
  lastActivity: number
}

export type SessionIndexEntry = {
  sessionId: string
  createdAt: number
  workDir?: string
}

export type SessionIndex = Record<string, SessionIndexEntry>

Key Logic: connectResponseSchema() is a factory function (not a cached value) to allow Zod to be lazy-loaded. Used by createDirectConnectSession.ts to validate the POST /sessions response body.

Dependencies: zod

server/createDirectConnectSession.ts

Path: src/server/createDirectConnectSession.ts

Purpose: Creates a session on a remote direct-connect Claude Code server. Posts to /sessions, validates response, returns a DirectConnectConfig ready for use by the REPL or headless runner.

Exports:

export class DirectConnectError extends Error {
  constructor(message: string)
  name: 'DirectConnectError'
}

export async function createDirectConnectSession(opts: {
  serverUrl: string
  authToken?: string
  cwd: string
  dangerouslySkipPermissions?: boolean
}): Promise<{
  config: DirectConnectConfig
  workDir?: string
}>

Key Logic:

POSTs { cwd, dangerously_skip_permissions? } as JSON to ${serverUrl}/sessions
Sends Authorization: Bearer ${authToken} if provided
Validates response JSON via connectResponseSchema().safeParse()
Returns { config: { serverUrl, sessionId, wsUrl, authToken }, workDir }
Throws DirectConnectError on fetch failure, non-OK HTTP status, or response parse failure

Dependencies: server/types.js, server/directConnectManager.js, utils/errors.js, utils/slowOperations.js

server/directConnectManager.ts

Path: src/server/directConnectManager.ts

Purpose: WebSocket client for communicating with a remote direct-connect Claude Code server. Handles message routing, permission request/response, interrupt signals, and connection lifecycle.

Exports:

export type DirectConnectConfig = {
  serverUrl: string
  sessionId: string
  wsUrl: string
  authToken?: string
}

export type DirectConnectCallbacks = {
  onMessage: (message: SDKMessage) => void
  onPermissionRequest: (request: SDKControlPermissionRequest, requestId: string) => void
  onConnected?: () => void
  onDisconnected?: () => void
  onError?: (error: Error) => void
}

export class DirectConnectSessionManager {
  constructor(config: DirectConnectConfig, callbacks: DirectConnectCallbacks)
  connect(): void
  sendMessage(content: RemoteMessageContent): boolean
  respondToPermissionRequest(requestId: string, result: RemotePermissionResponse): void
  sendInterrupt(): void
  disconnect(): void
  isConnected(): boolean
}

Key Logic:

connect(): opens WebSocket with Authorization: Bearer header (Bun WebSocket headers override); sets up open, message, close, error listeners
Message parsing: splits NDJSON lines, parses each line, dispatches:
- control_request with subtype can_use_tool → onPermissionRequest()
- unrecognized control subtypes → auto-sends error response (prevents server hang)
- Filtered out: control_response, keep_alive, control_cancel_request, streamlined_text, streamlined_tool_use_summary, system messages with subtype post_turn_summary
- All others → onMessage()
sendMessage(): formats as SDKUserMessage ({ type: 'user', message: { role: 'user', content }, parent_tool_use_id: null, session_id: '' })
respondToPermissionRequest(): formats as SDKControlResponse with behavior and either updatedInput (allow) or message (deny)
sendInterrupt(): sends { type: 'control_request', request_id: crypto.randomUUID(), request: { subtype: 'interrupt' } }

Dependencies: entrypoints/agentSdkTypes.js, entrypoints/sdk/controlTypes.js, remote/RemoteSessionManager.js, utils/debug.js, utils/slowOperations.js, utils/teleport/api.js

services/analytics/config.ts

Path: src/services/analytics/config.ts

Purpose: Shared analytics configuration — common logic for disabling analytics across all backends.

Exports:

export function isAnalyticsDisabled(): boolean
export function isFeedbackSurveyDisabled(): boolean

Key Logic:

isAnalyticsDisabled(): returns true when NODE_ENV === 'test', CLAUDE_CODE_USE_BEDROCK, CLAUDE_CODE_USE_VERTEX, CLAUDE_CODE_USE_FOUNDRY truthy, or isTelemetryDisabled() is true
isFeedbackSurveyDisabled(): returns true when NODE_ENV === 'test' or isTelemetryDisabled() — does NOT gate on 3P providers (Bedrock/Vertex/Foundry) since the survey is local UI with no transcript data; enterprise captures via OTEL

Dependencies: utils/envUtils.js, utils/privacyLevel.js

services/analytics/growthbook.ts

Path: src/services/analytics/growthbook.ts

Purpose: GrowthBook feature flag and dynamic config client. Provides cached and blocking access to feature gates, handles remote eval with disk persistence, manages refresh lifecycle, and exposes override APIs for development/testing.

Key Types:

export type GrowthBookUserAttributes = {
  user_id?: string
  org_id?: string
  user_type?: string
  // ... other Statsig-compatible attributes
}

Exports:

export function onGrowthBookRefresh(listener: () => void): () => void
export function hasGrowthBookEnvOverride(feature: string): boolean
export function getAllGrowthBookFeatures(): Record<string, unknown>
export function getGrowthBookConfigOverrides(): Record<string, unknown>
export function setGrowthBookConfigOverride(feature: string, value: unknown): void
export function clearGrowthBookConfigOverrides(): void
export function getApiBaseUrlHost(): string | undefined
export function initializeGrowthBook(): Promise<GrowthBook | null>
export function getFeatureValue_DEPRECATED<T>(feature: string, defaultValue: T): Promise<T>
export function getFeatureValue_CACHED_MAY_BE_STALE<T>(feature: string, defaultValue: T): T
export function getFeatureValue_CACHED_WITH_REFRESH<T>(feature: string, defaultValue: T): T  // deprecated
export function checkStatsigFeatureGate_CACHED_MAY_BE_STALE(gate: string): boolean
export function checkSecurityRestrictionGate(gate: string): Promise<boolean>
export function checkGate_CACHED_OR_BLOCKING(gate: string): Promise<boolean>
export function getDynamicConfig_CACHED_MAY_BE_STALE<T>(config: string, defaultValue: T): T
export function refreshGrowthBookAfterAuthChange(): void

Key Logic:

Initialization (initializeGrowthBook()): Memoized singleton. Loads disk-cached features from ~/.claude/cachedGrowthBookFeatures. Applies CLAUDE_INTERNAL_FC_OVERRIDES env var overrides (JSON). Connects to GrowthBook remote with 5000ms timeout, then sets up periodic refresh. Returns null when analytics disabled or in API key mode without user_id
Remote eval workaround: GrowthBook's remote eval returns { value } but client expects { defaultValue }. The code transforms { value: V } → { defaultValue: V } before storing in remoteEvalFeatureValues Map. Synced to disk via syncRemoteEvalToDisk()
Caching tiers:
- _DEPRECATED functions: block on initializeGrowthBook() Promise
- _CACHED_MAY_BE_STALE: returns synchronously from in-memory cache (may be stale after refresh)
- _CACHED_OR_BLOCKING: awaits init, then returns cached value; used for security gates only
Security gates (checkSecurityRestrictionGate()): awaits init, checks gate value, blocks if not initialized. Used for enterprise policy enforcement
Refresh listeners: onGrowthBookRefresh() registers a listener called after each GrowthBook refresh cycle; returns unsubscribe function
Overrides: setGrowthBookConfigOverride() / clearGrowthBookConfigOverrides() in-process override map; CLAUDE_INTERNAL_FC_OVERRIDES JSON env var for process-level overrides

Configuration:

Disk cache: ~/.claude/cachedGrowthBookFeatures
Init timeout: 5000ms
CLAUDE_INTERNAL_FC_OVERRIDES env var: JSON override map

Dependencies: growthbook SDK, services/analytics/config.js, utils/auth.js, utils/config.js

services/analytics/metadata.ts

Path: src/services/analytics/metadata.ts

Purpose: Event metadata enrichment for analytics. Provides types and utilities for building structured EventMetadata objects with environment context, process metrics, and safe telemetry extraction from tool inputs.

Constants:

TOOL_INPUT_STRING_TRUNCATE_AT = 512 — strings longer than this get truncated
TOOL_INPUT_STRING_TRUNCATE_TO = 128 — truncated target length
TOOL_INPUT_MAX_JSON_CHARS = 4096 — JSON input cap before discarding
MAX_FILE_EXTENSION_LENGTH = 10 — max chars for file extensions

Exports:

export type AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS = never  // marker type

export function sanitizeToolNameForAnalytics(toolName: string): never  // returns marker type

export function isToolDetailsLoggingEnabled(): boolean  // gated on OTEL_LOG_TOOL_DETAILS env

export function isAnalyticsToolDetailsLoggingEnabled(
  mcpServerType: string | undefined,
  mcpServerBaseUrl: string | undefined
): boolean

export function mcpToolDetailsForAnalytics(
  toolName: string,
  mcpServerType: string | undefined,
  mcpServerBaseUrl: string | undefined
): { mcpServerName?: never; mcpToolName?: never }

export function extractMcpToolDetails(
  toolName: string
): { serverName: string; mcpToolName: string } | undefined

export function extractSkillName(
  toolName: string,
  input: unknown
): never | undefined  // returns marker type or undefined

export function extractToolInputForTelemetry(input: unknown): string | undefined

export function getFileExtensionForAnalytics(filePath: string): never | undefined

export function getFileExtensionsFromBashCommand(
  command: string,
  simulatedSedEditFilePath?: string
): never | undefined

export type EnvContext = {
  userType: string
  isCI: boolean
  platform: string
  // ... other context fields
}

export type ProcessMetrics = {
  heapUsedMB: number
  heapTotalMB: number
  rssMB: number
  externalMB: number
}

export type EventMetadata = {
  // enriched event payload type
}

export type EnrichMetadataOptions = {
  includeProcessMetrics?: boolean
  // ...
}

export async function getEventMetadata(options?: EnrichMetadataOptions): Promise<EventMetadata>
export async function buildEnvContext(): Promise<EnvContext>  // memoized

Key Logic:

BUILTIN_MCP_SERVER_NAMES set is gated behind CHICAGO_MCP feature flag — determines which MCP servers are considered "builtin"
extractToolInputForTelemetry(): JSON-serializes input, truncates strings over TOOL_INPUT_STRING_TRUNCATE_AT to TOOL_INPUT_STRING_TRUNCATE_TO, caps total at TOOL_INPUT_MAX_JSON_CHARS
getFileExtensionsFromBashCommand(): parses bash command to extract file extensions using regex patterns; handles sed -i specially via simulatedSedEditFilePath
buildEnvContext() is memoized — called once per process and cached
Agent identification classifies turns as: teammate (subagent of another), subagent (spawned by coordinator), standalone

Dependencies: services/analytics/growthbook.js, utils/envUtils.js, utils/platform.js

services/analytics/index.ts

Path: src/services/analytics/index.ts

Purpose: The main analytics entry point — a no-dependency module that provides a queuing facade for all event logging. Events are queued until a sink is attached, preventing startup ordering issues.

Design: Explicitly has NO dependencies to avoid import cycles. Events are queued in eventQueue until attachAnalyticsSink() drains them via queueMicrotask.

Exports:

export type AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS = never  // marker type
export type AnalyticsMetadata_I_VERIFIED_THIS_IS_PII_TAGGED = never  // PII-tagged marker type

export function stripProtoFields<V>(
  metadata: Record<string, V>
): Record<string, V>

export type AnalyticsSink = {
  logEvent: (eventName: string, metadata: LogEventMetadata) => void
  logEventAsync: (eventName: string, metadata: LogEventMetadata) => Promise<void>
}

export function attachAnalyticsSink(newSink: AnalyticsSink): void
export function logEvent(eventName: string, metadata: LogEventMetadata): void
export async function logEventAsync(eventName: string, metadata: LogEventMetadata): Promise<void>
export function _resetForTesting(): void

Types (internal):

type LogEventMetadata = { [key: string]: boolean | number | undefined }
type QueuedEvent = { eventName: string; metadata: LogEventMetadata; async: boolean }

Key Logic:

attachAnalyticsSink(): idempotent (no-op if sink already set). Drains queue via queueMicrotask to avoid blocking startup. For ant users (USER_TYPE === 'ant'), logs analytics_sink_attached with queued_event_count
stripProtoFields(): removes keys starting with _PROTO_ from event metadata (for non-1P destinations). Returns same reference if no _PROTO_ keys present
_PROTO_* keys route to PII-tagged BigQuery columns — stripped before Datadog but preserved for firstPartyEventLoggingExporter
Metadata type is intentionally restricted to boolean | number | undefined — no strings unless explicitly cast with the marker type

services/analytics/sink.ts

Path: src/services/analytics/sink.ts

Purpose: The analytics sink implementation that routes events to Datadog and first-party event logging backends. Handles sampling, metadata enrichment, and per-sink kill switches.

Exports:

export function createAnalyticsSink(options?: {
  isInteractive?: boolean
}): AnalyticsSink

Key Logic:

Routes events to two sinks: Datadog (via logDatadogEvent) and first-party event logging (via log1PEvent)
Checks isSinkKilled('datadog') and isSinkKilled('firstParty') before dispatching to each sink
Applies sampling based on tengu_event_sampling_config dynamic config — adds sample_rate to metadata when sampled
Strips _PROTO_* keys before Datadog fanout (stripProtoFields)
Metadata is enriched with getEventMetadata() before dispatch

services/analytics/sinkKillswitch.ts

Path: src/services/analytics/sinkKillswitch.ts

Purpose: Per-sink analytics kill switch, controlled by a GrowthBook JSON config.

Exports:

export type SinkName = 'datadog' | 'firstParty'

export function isSinkKilled(sink: SinkName): boolean

Key Logic:

Config name: tengu_frond_boric (mangled/obfuscated name)
Shape: { datadog?: boolean, firstParty?: boolean } — true stops dispatch to that sink
Default {} (nothing killed). Fail-open: missing/malformed config = sink stays on
Must NOT be called from isGrowthBookEnabled() — would cause recursion; call at per-event dispatch sites instead

Dependencies: services/analytics/growthbook.js

services/analytics/datadog.ts

Path: src/services/analytics/datadog.ts

Purpose: Datadog metrics and event logging integration for Claude Code analytics.

Key Logic:

Sends events via @datadog/datadog-ci or direct HTTP to Datadog API
Disabled when isAnalyticsDisabled() returns true
Event namespace: tengu_* prefix for all Claude Code events
Tags include version, platform, user type, session metadata

services/analytics/firstPartyEventLogger.ts

Path: src/services/analytics/firstPartyEventLogger.ts

Purpose: First-party event logging integration — routes events to the internal event logging system.

Key Logic:

Gated by is1PEventLoggingEnabled() which checks GrowthBook feature tengu_fpel and isAnalyticsDisabled()
Enriches events with EventMetadata from getEventMetadata()
Handles proto field hoisting from _PROTO_* keys

services/analytics/firstPartyEventLoggingExporter.ts

Path: src/services/analytics/firstPartyEventLoggingExporter.ts

Purpose: OpenTelemetry log exporter that routes logs to the first-party event logging pipeline.

Key Logic:

Implements OTel LogRecordExporter interface
Hoists _PROTO_* keys to top-level proto fields in the BQ destination
Calls stripProtoFields() after hoisting as defensive cleanup
Only sends to first-party pipeline (not Datadog)

services/api/bootstrap.ts

Path: src/services/api/bootstrap.ts

Purpose: Bootstraps the API client with session-specific configuration at startup. Wires together auth, proxy, and telemetry settings.

Key Logic:

Configures ANTHROPIC_API_URL base URL, auth headers, proxy settings
Calls initializeGrowthBook() early in startup
Sets up OTel span management
Handles CLAUDE_CODE_SKIP_BEDROCK_TLS for Bedrock TLS verification skip

services/api/client.ts

Path: src/services/api/client.ts

Purpose: Provides the configured SDK client instance and helper utilities for making API calls.

Exports:

export function getClient(): Anthropic
export function getClientForModel(model: string): Anthropic

Key Logic:

Client is created lazily and cached
Applies base URL overrides from ANTHROPIC_BASE_URL env
Configures mTLS via getMtlsConfig()
Routes through proxy if HTTPS_PROXY / HTTP_PROXY set

services/api/claude.ts

Path: src/services/api/claude.ts

Purpose: Main API call layer for Claude completions. Handles prompt caching, extra body parameters, task budget configuration, metadata, and user message formatting.

Exports:

export function getExtraBodyParams(betaHeaders?: string[]): JsonObject
export function getPromptCachingEnabled(model: string): boolean
export function getCacheControl(opts: {
  scope?: string
  querySource?: QuerySource
}): { type: 'ephemeral' | 'persistent'; ttl?: number; scope?: string }
export function configureTaskBudgetParams(
  taskBudget: number,
  outputConfig: OutputConfig,
  betas: string[]
): void
export function getAPIMetadata(): { user_id: string }
export async function verifyApiKey(
  apiKey: string,
  isNonInteractiveSession: boolean
): Promise<boolean>
export function userMessageToMessageParam(
  message: UserMessage,
  addCache: boolean,
  enablePromptCaching: boolean,
  querySource?: QuerySource
): MessageParam

Internal functions (not exported):

configureEffortParams(): sets thinking budget based on effort level
should1hCacheTTL(): checks if 1h TTL is applicable for current user/model

Key Logic:

Prompt caching: getPromptCachingEnabled() checks model allowlist. getCacheControl() returns { type: 'ephemeral' } normally, { type: 'ephemeral', ttl: 3600 } when 1h TTL gate passes
1h TTL gate: should1hCacheTTL() checks tengu_prompt_cache_1h_config GrowthBook allowlist (session-stable, latched in STATE.promptCache1hAllowlist) and STATE.promptCache1hEligible (also latched to prevent mid-session overage flips)
Anti-distillation: tengu_anti_distill_fake_tool_injection GrowthBook gate — injects fake tools into API calls as a training data quality signal
Extra body params: getExtraBodyParams() assembles beta headers, model-specific params, and context management config

Dependencies: @anthropic-ai/sdk, bootstrap/state.js, services/analytics/growthbook.js, services/compact/apiMicrocompact.js

services/api/dumpPrompts.ts

Path: src/services/api/dumpPrompts.ts

Purpose: Debug utility for ant users — dumps API request/response JSONL logs to disk for inspection. Used for prompt debugging and sharing bug reports.

Exports:

export function getLastApiRequests(): Array<{ timestamp: string; request: unknown }>
export function clearApiRequestCache(): void
export function clearDumpState(agentIdOrSessionId: string): void
export function clearAllDumpState(): void
export function addApiRequestToCache(requestData: unknown): void
export function getDumpPromptsPath(agentIdOrSessionId?: string): string
export function createDumpPromptsFetch(
  agentIdOrSessionId: string
): ClientOptions['fetch']

Key Logic:

Ant-only (no-op for non-ant users)
MAX_CACHED_REQUESTS = 5 — in-memory ring buffer of recent requests
Deferred writes via setImmediate to avoid blocking the request path
JSONL format with records of types: init, system_update, message, response
Per-session state tracking with fingerprint-based change detection (avoids re-writing unchanged system prompts)
Path: ~/.claude/dump-prompts/<agentIdOrSessionId>.jsonl

services/api/emptyUsage.ts

Path: src/services/api/emptyUsage.ts

Purpose: Provides a zero-value Usage object for cases where usage data is unavailable.

Exports:

export const EMPTY_USAGE: Usage
export type NonNullableUsage = {
  input_tokens: number
  output_tokens: number
  cache_read_input_tokens: number
  cache_creation_input_tokens: number
}

services/api/errorUtils.ts

Path: src/services/api/errorUtils.ts

Purpose: Utilities for classifying and handling API errors.

Exports:

export function isRateLimitError(error: unknown): boolean
export function isOverloadedError(error: unknown): boolean
export function isAuthError(error: unknown): boolean
export function isConnectionError(error: unknown): boolean
export function getRetryAfterMs(error: unknown): number | undefined

services/api/errors.ts

Path: src/services/api/errors.ts

Purpose: Defines all API error message constants and classification functions for user-facing error handling.

Exports:

export const API_ERROR_MESSAGE_PREFIX = 'API Error'
export function startsWithApiErrorPrefix(text: string): boolean

export const PROMPT_TOO_LONG_ERROR_MESSAGE: string
export function isPromptTooLongMessage(msg: string): boolean
export function parsePromptTooLongTokenCounts(
  rawMessage: string
): { actualTokens: number; limitTokens: number } | null
export function getPromptTooLongTokenGap(msg: string): number | undefined

export function isMediaSizeError(raw: unknown): boolean
export function isMediaSizeErrorMessage(msg: string): boolean

export const CREDIT_BALANCE_TOO_LOW_ERROR_MESSAGE: string
export const INVALID_API_KEY_ERROR_MESSAGE: string
export const INVALID_API_KEY_ERROR_MESSAGE_EXTERNAL: string
export const TOKEN_REVOKED_ERROR_MESSAGE: string
export const CCR_AUTH_ERROR_MESSAGE: string
export const REPEATED_529_ERROR_MESSAGE: string
export const CUSTOM_OFF_SWITCH_MESSAGE: string
export const API_TIMEOUT_ERROR_MESSAGE: string
export const OAUTH_ORG_NOT_ALLOWED_ERROR_MESSAGE: string

export function getPdfTooLargeErrorMessage(): string
export function getPdfPasswordProtectedErrorMessage(): string
export function getPdfInvalidErrorMessage(): string
export function getImageTooLargeErrorMessage(): string
export function getRequestTooLargeErrorMessage(): string
export function getTokenRevokedErrorMessage(): string
export function getOauthOrgNotAllowedErrorMessage(): string

services/api/filesApi.ts

Path: src/services/api/filesApi.ts

Purpose: Files API client — downloads, uploads, lists, and manages files in Files API (beta).

Constants:

FILES_API_BETA_HEADER = 'files-api-2025-04-14,oauth-2025-04-20'
MAX_FILE_SIZE_BYTES = 500 * 1024 * 1024 (500MB)
DEFAULT_CONCURRENCY = 5
MAX_RETRIES = 3
BASE_DELAY_MS = 500

Exports:

export type File = {
  fileId: string
  relativePath: string
  mimeType?: string
}

export type FilesApiConfig = {
  apiKey?: string
  baseUrl?: string
  sessionId?: string
}

export type DownloadResult = {
  fileId: string
  relativePath: string
  success: boolean
  error?: string
  savedPath?: string
}

export type UploadResult = {
  fileId: string
  relativePath: string
  success: boolean
  error?: string
  remoteFileId?: string
}

export type FileMetadata = {
  id: string
  filename: string
  created_at: number
  purpose: string
  size: number
}

export class UploadNonRetriableError extends Error {}

export function parseFileSpecs(fileSpecs: string[]): File[]
export async function downloadFile(fileId: string, config: FilesApiConfig): Promise<Buffer>
export function buildDownloadPath(
  basePath: string,
  sessionId: string,
  relativePath: string
): string | null
export async function downloadAndSaveFile(
  attachment: File,
  config: FilesApiConfig
): Promise<DownloadResult>
export async function downloadSessionFiles(
  files: File[],
  config: FilesApiConfig,
  concurrency?: number
): Promise<DownloadResult[]>
export async function uploadFile(
  filePath: string,
  relativePath: string,
  config: FilesApiConfig,
  opts?: { retries?: number }
): Promise<UploadResult>
export async function uploadSessionFiles(
  files: File[],
  config: FilesApiConfig,
  concurrency?: number
): Promise<UploadResult[]>
export async function listFilesCreatedAfter(
  afterCreatedAt: number,
  config: FilesApiConfig
): Promise<FileMetadata[]>

Key Logic:

buildDownloadPath(): path traversal guard — if relativePath contains .. components or resolves outside basePath/sessionId, returns null
Download/upload use exponential backoff: BASE_DELAY_MS * 2^attempt with jitter
uploadSessionFiles() / downloadSessionFiles(): parallel with configurable concurrency (default 5)
listFilesCreatedAfter(): paginated using cursor, collects all pages

services/api/firstTokenDate.ts

Path: src/services/api/firstTokenDate.ts

Purpose: Fetches and stores the date when the user first made a Claude Code API call.

Exports:

export async function fetchAndStoreClaudeCodeFirstTokenDate(): Promise<void>

Key Logic:

Fetches /api/organization/claude_code_first_token_date
Stores in claudeCodeFirstTokenDate config field
Idempotent — no-ops if already stored

services/api/grove.ts

Path: src/services/api/grove.ts

Purpose: Grove is a consumer Terms/Privacy Policy notification feature. Manages fetching, caching, and determining whether to show the Grove notice to users.

Constants:

GROVE_CACHE_EXPIRATION_MS = 24 * 60 * 60 * 1000 (24 hours)

Exports:

export type AccountSettings = {
  groveEnabled: boolean
  groveNoticeViewed: boolean
  // ...
}

export type GroveConfig = {
  enabled: boolean
  forceShow: boolean
  // ...
}

export type ApiResult<T> = { success: true; data: T } | { success: false; error: string }

export async function getGroveSettings(): Promise<ApiResult<AccountSettings>>  // memoized 24h
export async function markGroveNoticeViewed(): Promise<void>
export async function updateGroveSettings(groveEnabled: boolean): Promise<void>
export async function isQualifiedForGrove(): Promise<boolean>
export async function getGroveNoticeConfig(): Promise<ApiResult<GroveConfig>>  // memoized 24h
export function calculateShouldShowGrove(
  settingsResult: ApiResult<AccountSettings>,
  configResult: ApiResult<GroveConfig>,
  showIfAlreadyViewed: boolean
): boolean
export async function checkGroveForNonInteractive(): Promise<void>

Key Logic:

Cache-first with background refresh: returns cached data immediately, refreshes in background after expiry
calculateShouldShowGrove(): checks config enabled, settings not viewed, and user qualification
checkGroveForNonInteractive(): called in non-interactive mode to log grove status without showing UI

services/api/logging.ts

Path: src/services/api/logging.ts

Purpose: API query/success/error logging with gateway detection and OTel span management.

Exports:

export type GlobalCacheStrategy = 'tool_based' | 'system_prompt' | 'none'

export function logAPIQuery(opts: {
  model: string
  querySource: QuerySource
  // ... other fields
}): void

export function logAPIError(opts: {
  error: unknown
  model: string
  querySource: QuerySource
  // ... other fields
}): void

export function logAPISuccessAndDuration(opts: {
  model: string
  usage: Usage
  querySource: QuerySource
  durationMs: number
  // ... other fields
}): void

Key Logic:

Gateway detection: identifies litellm, helicone, portkey, cloudflare-ai-gateway, kong, braintrust, databricks from ANTHROPIC_BASE_URL
Events: tengu_api_query, tengu_api_error, tengu_api_success
OTel spans created/ended around API calls
Teleport session tracking: logs extra fields when session is teleported
Re-exports EMPTY_USAGE and NonNullableUsage

services/api/metricsOptOut.ts

Path: src/services/api/metricsOptOut.ts

Purpose: Checks whether metrics collection is enabled for the current organization. Implements two-tier caching.

Constants:

CACHE_TTL_MS = 60 * 60 * 1000 (1 hour in-memory)
DISK_CACHE_TTL_MS = 24 * 60 * 60 * 1000 (24 hours on disk)
Endpoint: api/claude_code/organizations/metrics_enabled

Exports:

export async function checkMetricsEnabled(): Promise<MetricsStatus>
export function _clearMetricsEnabledCacheForTesting(): void

Key Logic:

Two-tier cache: in-memory (1h TTL) → disk (24h TTL) → network
Requires profile OAuth scope; returns enabled: true if unauthenticated or scope missing
MetricsStatus: { enabled: boolean; source: 'cache' | 'network' | 'default' }

services/api/overageCreditGrant.ts

Path: src/services/api/overageCreditGrant.ts

Purpose: Manages overage credit grant information for subscribed users who exceed their plan limits.

Constants:

CACHE_TTL_MS = 60 * 60 * 1000 (1 hour)

Exports:

export type OverageCreditGrantInfo = {
  hasGrant: boolean
  amount?: number
  currency?: string
  expiresAt?: string
}

export type OverageCreditGrantCacheEntry = {
  data: OverageCreditGrantInfo
  fetchedAt: number
  orgId: string
}

export function getCachedOverageCreditGrant(): OverageCreditGrantInfo | null
export function invalidateOverageCreditGrantCache(): void
export async function refreshOverageCreditGrantCache(): Promise<void>
export function formatGrantAmount(info: OverageCreditGrantInfo): string | null

Key Logic:

Per-org cache in overageCreditGrantCache Map (keyed by org ID)
formatGrantAmount(): formats amount as currency string (e.g., "$5.00") or null if no grant

services/api/promptCacheBreakDetection.ts

Path: src/services/api/promptCacheBreakDetection.ts

Purpose: Detects unexpected prompt cache breaks that indicate server-side cache eviction. Writes diff files to disk for debugging.

Constants:

CACHE_TTL_1HOUR_MS = 3_600_000 (1 hour)
MIN_CACHE_MISS_TOKENS = 2_000 — minimum to consider a break significant
95% threshold — cache reads must drop to ≤5% of expected to count as a break
MAX_TRACKED_SOURCES = 10

Exports:

export type PromptStateSnapshot = {
  messages: MessageParam[]
  systemPrompt: string
  tools: unknown[]
  timestamp: number
  querySource: QuerySource
}

export const CACHE_TTL_1HOUR_MS: number

export function recordPromptState(snapshot: PromptStateSnapshot): void
export async function checkResponseForCacheBreak(
  querySource: QuerySource,
  cacheReadTokens: number,
  cacheCreationTokens: number,
  messages: MessageParam[],
  agentId?: string,
  requestId?: string
): Promise<void>
export function notifyCacheDeletion(querySource: QuerySource, agentId?: string): void
export function notifyCompaction(querySource: QuerySource, agentId?: string): void
export function cleanupAgentTracking(agentId: string): void
export function resetPromptCacheBreakDetection(): void

Key Logic:

2-phase detection: recordPromptState() before call, checkResponseForCacheBreak() after
Per-source tracking Map: keyed by querySource (or agent:${agentId})
Tracked source prefixes: repl_main_thread, sdk, agent:custom, agent:default, agent:builtin
Writes diff files to ~/.claude/tmp/cache-break-*.diff when a break is detected
Events: tengu_prompt_cache_break
notifyCacheDeletion() / notifyCompaction(): suppress false positives after intentional cache clearing

services/api/referral.ts

Path: src/services/api/referral.ts

Purpose: Manages referral program eligibility, redemptions, and guest passes for Claude Code subscribers.

Constants:

CACHE_EXPIRATION_MS = 24 * 60 * 60 * 1000 (24 hours)

Exports:

export async function fetchReferralEligibility(
  campaign?: string
): Promise<ReferralEligibilityResponse>
export async function fetchReferralRedemptions(
  campaign?: string
): Promise<ReferralRedemptionsResponse>
export function checkCachedPassesEligibility(): {
  eligible: boolean
  needsRefresh: boolean
  hasCache: boolean
}
export function formatCreditAmount(reward: ReferrerReward): string
export function getCachedReferrerReward(): ReferrerRewardInfo | null
export function getCachedRemainingPasses(): number | null
export async function fetchAndStorePassesEligibility(): Promise<ReferralEligibilityResponse | null>
export async function getCachedOrFetchPassesEligibility(): Promise<ReferralEligibilityResponse | null>
export async function prefetchPassesEligibility(): Promise<void>

Key Logic:

Max-subscription only — returns null / ineligible for non-max subscribers
In-flight deduplication: multiple calls to getCachedOrFetchPassesEligibility() share one pending Promise
24h cache TTL

services/api/sessionIngress.ts

Path: src/services/api/sessionIngress.ts

Purpose: Manages session log ingress — append-log with optimistic concurrency for multi-writer scenarios (e.g., continued sessions from different machines).

Constants:

MAX_RETRIES = 10
BASE_DELAY_MS = 500 — exponential backoff base

Exports:

export async function appendSessionLog(
  sessionId: string,
  entry: SessionLogEntry,
  url: string
): Promise<boolean>
export async function getSessionLogs(
  sessionId: string,
  url: string
): Promise<Entry[] | null>
export async function getSessionLogsViaOAuth(
  sessionId: string,
  accessToken: string,
  orgUUID: string
): Promise<Entry[] | null>
export async function getTeleportEvents(
  sessionId: string,
  accessToken: string,
  orgUUID: string
): Promise<Entry[] | null>
export function clearSession(sessionId: string): void
export function clearAllSessions(): void

Key Logic:

Optimistic concurrency: Last-Uuid header on append; 409 response adopts server's last UUID
Sequential wrappers per session prevent out-of-order appends
getTeleportEvents(): paginated (max 100 pages, 1000 events/page)
clearSession() / clearAllSessions(): clears in-memory sequential wrapper state

services/api/ultrareviewQuota.ts

Path: src/services/api/ultrareviewQuota.ts

Purpose: Fetches ultrareview (deep code review) quota information for subscribed users.

Exports:

export type UltrareviewQuotaResponse = {
  used: number
  limit: number
  resetsAt: string
}

export async function fetchUltrareviewQuota(): Promise<UltrareviewQuotaResponse | null>

Key Logic:

Endpoint: /v1/ultrareview/quota
Subscriber-only; returns null for non-subscribers or on error
5 second timeout

services/api/usage.ts

Path: src/services/api/usage.ts

Purpose: Fetches usage statistics for the current user/organization from the Claude Code API.

Exports:

export async function fetchUsage(): Promise<UsageStats | null>
export type UsageStats = {
  // usage breakdown fields
}

services/api/withRetry.ts

Path: src/services/api/withRetry.ts

Purpose: Generic retry wrapper for API calls with exponential backoff.

Exports:

export async function withRetry<T>(
  fn: () => Promise<T>,
  opts?: {
    maxRetries?: number
    baseDelayMs?: number
    shouldRetry?: (error: unknown) => boolean
  }
): Promise<T>

services/AgentSummary/agentSummary.ts

Path: src/services/AgentSummary/agentSummary.ts

Purpose: Periodic background summarization of agent conversations to compress context while preserving key information.

Key Logic:

Runs on a 30-second background timer
Generates summaries using the main Claude model
Compressed summaries are injected back as system messages
Used by subagents and teammates to manage long-running conversations

services/autoDream/autoDream.ts

Path: src/services/autoDream/autoDream.ts

Purpose: Background memory consolidation system. Periodically scans session transcripts and uses a forked agent to consolidate learnings into persistent memory files.

Constants:

SESSION_SCAN_INTERVAL_MS = 10 * 60 * 1000 (10 minutes)
DEFAULTS = { minHours: 24, minSessions: 5 } — minimum time and sessions before consolidation

Exports:

export function initAutoDream(): () => void  // returns stop/cleanup function

Key Logic:

Gate order: time check (minHours) → session count check (minSessions) → consolidation lock
GrowthBook config tengu_onyx_plover controls { minHours, minSessions, enabled }
initAutoDream() registers as a post-sampling hook; returns cleanup function
Uses SESSION_SCAN_INTERVAL_MS for polling
Spawns a forked agent using buildConsolidationPrompt()

services/autoDream/config.ts

Path: src/services/autoDream/config.ts

Purpose: Configuration gate for the autoDream memory consolidation feature.

Exports:

export function isAutoDreamEnabled(): boolean

Key Logic: User setting takes precedence over GrowthBook gate tengu_onyx_plover. Checks userSettings.autoDream first, then GrowthBook.

services/autoDream/consolidationLock.ts

Path: src/services/autoDream/consolidationLock.ts

Purpose: File-based mutex lock for the memory consolidation process to prevent concurrent consolidations across sessions/processes.

Constants:

LOCK_FILE = '.consolidate-lock' — in memory directory
HOLDER_STALE_MS = 60 * 60 * 1000 (1 hour) — stale lock threshold

Exports:

export async function readLastConsolidatedAt(): Promise<number>
export async function tryAcquireConsolidationLock(): Promise<number | null>
export async function rollbackConsolidationLock(priorMtime: number): Promise<void>
export async function listSessionsTouchedSince(sinceMs: number): Promise<string[]>
export async function recordConsolidation(): Promise<void>

Key Logic:

Lock file mtime = lastConsolidatedAt timestamp (dual-purpose: both locking and timestamp)
PID-based ownership — stale locks (PID dead or >1h old) are overwritten
tryAcquireConsolidationLock(): returns prior mtime on success, null if already held
rollbackConsolidationLock(): restores mtime to priorMtime on consolidation failure

services/autoDream/consolidationPrompt.ts

Path: src/services/autoDream/consolidationPrompt.ts

Purpose: Builds the system prompt for the memory consolidation agent.

Exports:

export function buildConsolidationPrompt(
  memoryRoot: string,
  transcriptDir: string,
  extra: string
): string

Key Logic: Returns a 4-phase prompt:

Orient — read existing memory files to understand current state
Gather recent signal — read session transcripts since last consolidation
Consolidate — merge new learnings into memory files
Prune and index — remove stale entries, update index file

services/awaySummary.ts

Path: src/services/awaySummary.ts

Purpose: Generates "away summaries" — brief catch-up summaries shown when the user returns to a long-running session after being away.

Key Logic:

Triggered when lastInteractionTime gap exceeds threshold
Uses Claude to generate a brief (1-3 sentence) summary of what happened while away
Displayed as a system message above the prompt

services/claudeAiLimits.ts

Path: src/services/claudeAiLimits.ts

Purpose: Fetches and manages rate limit information for Claude.ai-authenticated users.

Exports:

export async function fetchClaudeAiLimits(): Promise<ClaudeAiLimits | null>
export type ClaudeAiLimits = {
  // rate limit fields
}

services/claudeAiLimitsHook.ts

Path: src/services/claudeAiLimitsHook.ts

Purpose: React hook for accessing Claude.ai rate limit data with automatic refresh.

Exports:

export function useClaudeAiLimits(): ClaudeAiLimits | null

services/compact/apiMicrocompact.ts

Path: src/services/compact/apiMicrocompact.ts

Purpose: API-native context management strategies using server-side cache_edits feature. Configures context window editing without full client-side rewriting.

Constants:

DEFAULT_MAX_INPUT_TOKENS = 180_000
DEFAULT_TARGET_INPUT_TOKENS = 40_000

Type: ContextEditStrategy:

export type ContextEditStrategy =
  | {
      type: 'clear_tool_uses_20250919'
      trigger?: { type: 'input_tokens'; value: number }
      keep?: { type: 'tool_uses'; value: number }
      clear_tool_inputs?: boolean | string[]
      exclude_tools?: string[]
      clear_at_least?: { type: 'input_tokens'; value: number }
    }
  | {
      type: 'clear_thinking_20251015'
      keep: { type: 'thinking_turns'; value: number } | 'all'
    }

export type ContextManagementConfig = {
  edits: ContextEditStrategy[]
}

Exports:

export function getAPIContextManagement(options?: {
  hasThinking?: boolean
  isRedactThinkingActive?: boolean
  clearAllThinking?: boolean
}): ContextManagementConfig | undefined

Key Logic:

Tool clearing strategies are ant-only, gated by USE_API_CLEAR_TOOL_RESULTS and USE_API_CLEAR_TOOL_USES env vars
TOOLS_CLEARABLE_RESULTS: shell tools, Glob, Grep, FileRead, WebFetch, WebSearch
TOOLS_CLEARABLE_USES: FileEdit, FileWrite, NotebookEdit
Thinking clearing: when hasThinking && !isRedactThinkingActive, adds clear_thinking_20251015
When clearAllThinking (>1h idle = confirmed cache miss): keeps only last 1 thinking turn

services/compact/autoCompact.ts

Path: src/services/compact/autoCompact.ts

Purpose: Automatic context compaction — triggers full conversation summarization when context window usage exceeds threshold.

Key Logic:

Monitors token usage against configurable threshold (default 90% of context window)
When triggered, calls compact() to summarize the conversation
Posts a CompactBoundaryMessage in the conversation to mark compaction point
Resets token tracking after compaction

services/compact/compact.ts

Path: src/services/compact/compact.ts

Purpose: Full conversation compaction — replaces conversation history with an LLM-generated summary.

Key Logic:

Uses the detailed analysis instruction prompts from prompt.ts
Optionally performs partial compaction (keeps recent messages)
The NO_TOOLS_PREAMBLE constant is a critical instruction preventing the compaction model from calling tools during summarization
Writes compact summary as a synthetic <compact_summary> tagged message

services/compact/compactWarningHook.ts

Path: src/services/compact/compactWarningHook.ts

Purpose: React hook for accessing the compact warning suppression state.

Exports:

export function useCompactWarningSuppression(): boolean

services/compact/compactWarningState.ts

Path: src/services/compact/compactWarningState.ts

Purpose: Store and actions for suppressing the "compact recommended" warning after microcompact runs.

Exports:

export const compactWarningStore: Store<boolean>
export function suppressCompactWarning(): void
export function clearCompactWarningSuppression(): void

services/compact/grouping.ts

Path: src/services/compact/grouping.ts

Purpose: Groups conversation messages by API round (each assistant message with its preceding user message).

Exports:

export function groupMessagesByApiRound(messages: Message[]): Message[][]

Key Logic: Groups by assistant message.id boundary — each group contains one API round (user + assistant + tool results).

services/compact/microCompact.ts

Path: src/services/compact/microCompact.ts

Purpose: Microcompaction — lightweight context reduction by clearing tool result content without full conversation summarization. Two paths: cached microcompact (via API cache_edits) and time-based microcompact (direct content mutation when cache is cold).

Constants (exported):

export const TIME_BASED_MC_CLEARED_MESSAGE = '[Old tool result content cleared]'

Compactable tool sets:

const COMPACTABLE_TOOLS = new Set([
  FILE_READ_TOOL_NAME, SHELL_TOOL_NAMES..., GREP_TOOL_NAME, GLOB_TOOL_NAME,
  WEB_SEARCH_TOOL_NAME, WEB_FETCH_TOOL_NAME, FILE_EDIT_TOOL_NAME, FILE_WRITE_TOOL_NAME
])

Exports:

export function consumePendingCacheEdits():
  import('./cachedMicrocompact.js').CacheEditsBlock | null

export function getPinnedCacheEdits():
  import('./cachedMicrocompact.js').PinnedCacheEdits[]

export function pinCacheEdits(
  userMessageIndex: number,
  block: import('./cachedMicrocompact.js').CacheEditsBlock
): void

export function markToolsSentToAPIState(): void

export function resetMicrocompactState(): void

export function estimateMessageTokens(messages: Message[]): number

export type PendingCacheEdits = {
  trigger: 'auto'
  deletedToolIds: string[]
  baselineCacheDeletedTokens: number
}

export type MicrocompactResult = {
  messages: Message[]
  compactionInfo?: {
    pendingCacheEdits?: PendingCacheEdits
  }
}

export function evaluateTimeBasedTrigger(
  messages: Message[],
  querySource: QuerySource | undefined
): { gapMinutes: number; config: TimeBasedMCConfig } | null

export async function microcompactMessages(
  messages: Message[],
  toolUseContext?: ToolUseContext,
  querySource?: QuerySource
): Promise<MicrocompactResult>

Key Logic:

microcompactMessages() dispatch order:
1. Time-based trigger check: if gap since last assistant > threshold → maybeTimeBasedMicrocompact() (short-circuits)
2. Cached MC path: if CACHED_MICROCOMPACT feature enabled, model supported, and main thread source → cachedMicrocompactPath()
3. Otherwise: return messages unchanged (legacy path removed)
Cached MC path: registers tool results grouped by user message; calls getToolResultsToDelete(); queues CacheEditsBlock as pendingCacheEdits; does NOT mutate message content
Time-based MC path: directly mutates tool result content to TIME_BASED_MC_CLEARED_MESSAGE; resets cached MC state; notifies cache break detection
estimateMessageTokens(): rough estimation with 4/3 padding factor; images/documents = 2000 tokens
isMainThreadSource(): prefix-matches repl_main_thread (handles output style variants like repl_main_thread:outputStyle:custom)
Events: tengu_cached_microcompact, tengu_time_based_microcompact

services/compact/postCompactCleanup.ts

Path: src/services/compact/postCompactCleanup.ts

Purpose: Runs cleanup tasks after any compaction (auto or manual /compact).

Exports:

export function runPostCompactCleanup(querySource?: QuerySource): void

Key Logic: Clears: microcompact state, context collapse state, system prompt sections, classifier approvals, speculative checks, beta tracing state, session messages cache.

services/compact/prompt.ts

Path: src/services/compact/prompt.ts

Purpose: Prompt constants used for compact summarization.

Key Exports:

NO_TOOLS_PREAMBLE: Critical instruction string prepended to compact calls — prevents the model from invoking any tools during summarization
DETAILED_ANALYSIS_INSTRUCTION_BASE: Instruction for full compaction
DETAILED_ANALYSIS_INSTRUCTION_PARTIAL: Instruction for partial compaction (keeps recent messages)

services/compact/sessionMemoryCompact.ts

Path: src/services/compact/sessionMemoryCompact.ts

Purpose: Session memory compaction — a lighter alternative to full compact that summarizes older session memory segments while preserving recent tool context.

Constants:

export const DEFAULT_SM_COMPACT_CONFIG: SessionMemoryCompactConfig = {
  minTokens: 10000,
  minTextBlockMessages: 5,
  maxTokens: 40000
}

Exports:

export type SessionMemoryCompactConfig = {
  minTokens: number
  minTextBlockMessages: number
  maxTokens: number
}

export function setSessionMemoryCompactConfig(config: SessionMemoryCompactConfig): void
export function getSessionMemoryCompactConfig(): SessionMemoryCompactConfig
export function resetSessionMemoryCompactConfig(): void
export function hasTextBlocks(message: Message): boolean
export function adjustIndexToPreserveAPIInvariants(
  messages: Message[],
  startIndex: number
): number
export function calculateMessagesToKeepIndex(
  messages: Message[],
  lastSummarizedIndex: number
): number
export function shouldUseSessionMemoryCompaction(): boolean
export async function trySessionMemoryCompaction(
  messages: Message[],
  agentId?: string,
  autoCompactThreshold?: number
): Promise<CompactionResult | null>

Key Logic:

GrowthBook config tengu_sm_compact_config overrides defaults
Guarded by ENABLE_CLAUDE_CODE_SM_COMPACT / DISABLE_CLAUDE_CODE_SM_COMPACT env vars
AND requires both GrowthBook gates tengu_session_memory AND tengu_sm_compact to be enabled
adjustIndexToPreserveAPIInvariants(): ensures cut point doesn't leave orphaned tool_use without tool_result
calculateMessagesToKeepIndex(): binary search-based index calculation respecting min/max token bounds

services/compact/timeBasedMCConfig.ts

Path: src/services/compact/timeBasedMCConfig.ts

Purpose: Configuration for time-based microcompact (triggers on idle gap).

Exports:

export type TimeBasedMCConfig = {
  enabled: boolean
  gapThresholdMinutes: number
  keepRecent: number
}

export function getTimeBasedMCConfig(): TimeBasedMCConfig

Key Logic:

GrowthBook config: tengu_slate_heron
Defaults: { enabled: false, gapThresholdMinutes: 60, keepRecent: 5 }

services/diagnosticTracking.ts

Path: src/services/diagnosticTracking.ts

Purpose: Tracks file diagnostics (lint errors, type errors) before and after file edits to detect regressions introduced by Claude Code.

Constants:

MAX_DIAGNOSTICS_SUMMARY_CHARS = 4000

Exports:

export interface Diagnostic {
  severity: 'error' | 'warning' | 'information' | 'hint'
  message: string
  source?: string
  range: { start: { line: number; character: number }; end: { line: number; character: number } }
}

export interface DiagnosticFile {
  uri: string
  diagnostics: Diagnostic[]
}

export class DiagnosticTrackingService {
  static getInstance(): DiagnosticTrackingService
  initialize(mcpClient: unknown): void
  shutdown(): Promise<void>
  reset(): void
  ensureFileOpened(fileUri: string): Promise<void>
  beforeFileEdited(filePath: string): Promise<void>
}

Key Logic:

Singleton via getInstance()
beforeFileEdited(): captures current diagnostics for a file before any edits, so post-edit diagnostics can be compared
initialize(): connects to LSP MCP client for diagnostic data
shutdown(): flushes any pending diagnostic comparisons

services/internalLogging.ts

Path: src/services/internalLogging.ts

Purpose: Internal logging utilities for internal (ant) users — logs K8s namespace, container ID, and tool permission context for debugging.

Exports:

export async function getContainerId(): Promise<string | null>  // memoized
export async function logPermissionContextForAnts(
  toolPermissionContext: unknown,
  moment: string
): Promise<void>

Key Logic:

K8s namespace: reads from /var/run/secrets/kubernetes.io/serviceaccount/namespace
Container ID: extracted from /proc/self/mountinfo (first overlay/device entry)
Both are memoized — container identity doesn't change mid-session
Only logs when USER_TYPE === 'ant'

services/MagicDocs/magicDocs.ts

Path: src/services/MagicDocs/magicDocs.ts

Purpose: Auto-maintained markdown documentation files that stay in sync with code changes made by Claude Code.

Key Logic:

Monitors file edits and regenerates associated markdown docs
Uses Claude to understand the semantic meaning of changes
Prompts defined in prompts.ts

services/MagicDocs/prompts.ts

Path: src/services/MagicDocs/prompts.ts

Purpose: System prompt and instruction templates for magic docs generation.

services/mcpServerApproval.tsx

Path: src/services/mcpServerApproval.tsx

Purpose: Shows MCP server approval dialogs for pending project servers at startup, reusing the existing Ink root instance.

Exports:

export async function handleMcpjsonServerApprovals(root: Root): Promise<void>

Key Logic:

Queries getMcpConfigsByScope('project') for project-scoped MCP servers
Filters to servers with status 'pending' via getProjectMcpServerStatus()
Single pending server: renders MCPServerApprovalDialog
Multiple pending servers: renders MCPServerMultiselectDialog
Awaits user decision via Promise/resolve pattern before returning

services/mockRateLimits.ts

Path: src/services/mockRateLimits.ts

Purpose: Development/testing utility for simulating various rate limit scenarios without hitting actual API limits. Ant-only.

Exports:

export type MockHeaderKey =
  | 'x-ratelimit-requests-remaining'
  | 'x-ratelimit-tokens-remaining'
  // ... other rate limit header names

export type MockScenario =
  | 'primary_hard_limit'
  | 'secondary_hard_limit'
  | 'approaching_limit'
  | 'fast_mode_rate_limit'
  | 'burst_limit'
  // ... 20+ scenarios total

export function setMockHeader(key: MockHeaderKey, value?: string): void
export function addExceededLimit(type: string, hoursFromNow: number): void
export function setMockEarlyWarning(
  claimAbbrev: string,
  utilization: number,
  hoursFromNow?: number
): void
export function clearMockEarlyWarning(): void
export function setMockRateLimitScenario(scenario: MockScenario): void
export function getMockHeaderless429Message(): string | null
export function getMockHeaders(): MockHeaders | null
export function getMockStatus(): string
export function clearMockHeaders(): void
export function applyMockHeaders(headers: Headers): Headers
export function shouldProcessMockLimits(): boolean
export function getCurrentMockScenario(): MockScenario | null
export function getScenarioDescription(scenario: MockScenario): string
export function setMockSubscriptionType(type: SubscriptionType | null): void
export function getMockSubscriptionType(): SubscriptionType | null
export function shouldUseMockSubscription(): boolean
export function setMockBillingAccess(hasAccess: boolean | null): void
export function isMockFastModeRateLimitScenario(): boolean
export function checkMockFastModeRateLimit(isFastModeActive?: boolean): MockHeaders | null

services/notifier.ts

Path: src/services/notifier.ts

Purpose: System-level desktop notifications for long-running operations.

Key Logic:

Sends macOS/Linux notifications when task completes (user is away)
Uses node-notifier or native OS notification APIs
Gated on user preference and focus state

services/preventSleep.ts

Path: src/services/preventSleep.ts

Purpose: Prevents system sleep while Claude Code tasks are running.

Key Logic:

Uses platform-specific APIs (caffeinate on macOS, systemd-inhibit on Linux)
Returns a cleanup function to re-enable sleep
Only active during tool execution phases

services/PromptSuggestion/promptSuggestion.ts

Path: src/services/PromptSuggestion/promptSuggestion.ts

Purpose: Generates prompt suggestions based on current codebase context for the prompt input autocomplete.

Key Logic:

Analyzes recent git changes, open files, and task patterns
Returns ranked suggestion list
Caches suggestions per-context hash to avoid redundant generation

services/PromptSuggestion/speculation.ts

Path: src/services/PromptSuggestion/speculation.ts

Purpose: Speculative pre-execution — starts running likely next commands before user confirms, then either applies or discards the result.

Key Logic:

Monitors user typing patterns to predict next action
Pre-warms common tool executions (file reads, searches)
Cancels speculative execution if prediction was wrong

services/rateLimitMocking.ts

Path: src/services/rateLimitMocking.ts

Purpose: Facade layer for rate limit mock application and error checking.

Exports:

export function processRateLimitHeaders(headers: Headers): Headers
export function shouldProcessRateLimits(isSubscriber: boolean): boolean
export function checkMockRateLimitError(
  currentModel: string,
  isFastModeActive?: boolean
): APIError | null
export function isMockRateLimitError(error: unknown): boolean
export { shouldProcessMockLimits }  // re-exported from mockRateLimits.ts

services/rateLimitMessages.ts

Path: src/services/rateLimitMessages.ts

Purpose: Human-readable rate limit message formatting and display logic.

Key Logic:

Formats rate limit headers into user-friendly messages
Handles early warning, hard limit, and reset time display
Localizes timestamps to user's timezone

services/SessionMemory/prompts.ts

Path: src/services/SessionMemory/prompts.ts

Purpose: Prompt templates for session memory operations (summarization, retrieval, consolidation).

services/SessionMemory/sessionMemory.ts

Path: src/services/SessionMemory/sessionMemory.ts

Purpose: Manages persistent session memory — stores and retrieves relevant context snippets across sessions.

Key Logic:

GrowthBook gate: tengu_session_memory
Stores memory in ~/.claude/sessions/<sessionId>/memory.jsonl
Retrieves relevant memories using semantic similarity
Integrates with conversation context as system prompt additions

services/SessionMemory/sessionMemoryUtils.ts

Path: src/services/SessionMemory/sessionMemoryUtils.ts

Purpose: Utility functions for session memory operations (formatting, filtering, path resolution).

services/tokenEstimation.ts

Path: src/services/tokenEstimation.ts

Purpose: Rough token count estimation without calling the API tokenizer.

Exports:

export function roughTokenCountEstimation(text: string): number

Key Logic: Approximates token count as text.length / 4 (roughly 4 chars per token for English/code). Used for pre-flight estimates in compaction decisions.

services/vcr.ts

Path: src/services/vcr.ts

Purpose: VCR (Video Cassette Recorder) test fixture system — records and replays API interactions for deterministic testing.

Exports:

export async function withVCR<T>(
  messages: unknown[],
  f: () => Promise<T>
): Promise<T>

export async function withFixture<T>(
  input: unknown,
  fixtureName: string,
  f: () => Promise<T>
): Promise<T>

export async function withStreamingVCR<T>(
  messages: unknown[],
  f: () => Promise<T>
): Promise<T>

Key Logic:

SHA1-hashes input to create fixture filenames (deterministic, content-addressed)
FORCE_VCR env var: ants can force VCR mode outside of test environment
CI guard: fails if fixture is missing and VCR_RECORD is not set (prevents silent misses)
Fixture storage: src/test-fixtures/vcr/ directory

services/voice.ts

Path: src/services/voice.ts

Purpose: Audio recording service for push-to-talk voice input. Supports native audio (cpal via NAPI) on macOS/Linux/Windows with SoX and arecord fallbacks on Linux.

Constants:

RECORDING_SAMPLE_RATE = 16000
RECORDING_CHANNELS = 1
SILENCE_DURATION_SECS = '2.0' — SoX silence detection
SILENCE_THRESHOLD = '3%'

Exports:

export type RecordingAvailability = {
  available: boolean
  reason: string | null
}

export async function checkVoiceDependencies(): Promise<{
  available: boolean
  missing: string[]
  installCommand: string | null
}>

export async function requestMicrophonePermission(): Promise<boolean>

export async function checkRecordingAvailability(): Promise<RecordingAvailability>

export async function startRecording(
  onData: (chunk: Buffer) => void,
  onEnd: () => void,
  options?: { silenceDetection?: boolean }
): Promise<boolean>

export function stopRecording(): void

export function _resetArecordProbeForTesting(): void
export function _resetAlsaCardsForTesting(): void

Key Logic:

Backend selection priority: native (cpal via NAPI) → arecord (ALSA, Linux only) → SoX rec
Native module: audio-capture-napi is lazy-loaded on first voice keypress (dlopen blocks event loop ~1s warm, ~8s cold)
arecord probe: memoized async probe that verifies device open succeeds (not just binary existence); 150ms race timer
Linux ALSA guard: checks /proc/asound/cards before using native cpal to avoid spurious stderr
WSL handling: distinguishes WSL1 (no audio), Win10 WSL2 (no audio), Win11 WSLg (PulseAudio works)
SoX arguments: raw PCM 16kHz/16-bit/mono with --buffer 1024 for small chunk flushing and silence detection
Push-to-talk mode: silenceDetection: false ignores native module's silence-triggered onEnd

services/voiceKeyterms.ts

Path: src/services/voiceKeyterms.ts

Purpose: Generates domain-specific vocabulary hints (Deepgram "keywords") for improved STT accuracy in the voice_stream endpoint.

Constants:

MAX_KEYTERMS = 50
GLOBAL_KEYTERMS: hardcoded list including 'MCP', 'symlink', 'grep', 'regex', 'localhost', 'codebase', 'TypeScript', 'JSON', 'OAuth', 'webhook', 'gRPC', 'dotfiles', 'subagent', 'worktree'

Exports:

export function splitIdentifier(name: string): string[]

export async function getVoiceKeyterms(
  recentFiles?: ReadonlySet<string>
): Promise<string[]>

Key Logic:

splitIdentifier(): splits camelCase/PascalCase/kebab-case/snake_case/path identifiers into words; discards fragments ≤2 chars
getVoiceKeyterms(): combines global terms + project root basename + git branch words + recent file name words
Project root basename kept whole (not split) to match full project name phrases
Git branch words split via splitIdentifier(); recent files split by filename stem
Capped at MAX_KEYTERMS = 50

services/voiceStreamSTT.ts

Path: src/services/voiceStreamSTT.ts

Purpose: voice_stream WebSocket STT client. Connects to wss://api.anthropic.com/api/ws/speech_to_text/voice_stream using OAuth credentials for push-to-talk transcription.

Constants:

VOICE_STREAM_PATH = '/api/ws/speech_to_text/voice_stream'
KEEPALIVE_INTERVAL_MS = 8_000
FINALIZE_TIMEOUTS_MS = { safety: 5_000, noData: 1_500 } (exported for tests)
Wire messages: KEEPALIVE_MSG = '{"type":"KeepAlive"}', CLOSE_STREAM_MSG = '{"type":"CloseStream"}'

Exports:

export const FINALIZE_TIMEOUTS_MS: { safety: number; noData: number }

export type VoiceStreamCallbacks = {
  onTranscript: (text: string, isFinal: boolean) => void
  onError: (error: string, opts?: { fatal?: boolean }) => void
  onClose: () => void
  onReady: (connection: VoiceStreamConnection) => void
}

export type FinalizeSource =
  | 'post_closestream_endpoint'
  | 'no_data_timeout'
  | 'safety_timeout'
  | 'ws_close'
  | 'ws_already_closed'

export type VoiceStreamConnection = {
  send: (audioChunk: Buffer) => void
  finalize: () => Promise<FinalizeSource>
  close: () => void
  isConnected: () => boolean
}

export function isVoiceStreamAvailable(): boolean

export async function connectVoiceStream(
  callbacks: VoiceStreamCallbacks,
  options?: { language?: string; keyterms?: string[] }
): Promise<VoiceStreamConnection | null>

Key Logic:

Only available for OAuth-authenticated users (OAuth tokens); gates on isOAuthAuthEnabled() and valid access token
Routes to api.anthropic.com (not claude.ai) to avoid Cloudflare TLS fingerprinting challenges
VOICE_STREAM_BASE_URL env var allows override for testing
URL params: encoding=linear16, sample_rate=16000, channels=1, endpointing_ms=300, utterance_end_ms=1000
GrowthBook gate tengu_cobalt_frost: enables Nova 3 STT provider via use_conversation_engine=true&stt_provider=deepgram-nova3
Keyterms appended as repeated keyterms= query params
keepalive interval: 8s
finalize() sends CloseStream, races noData (1.5s) vs safety (5s) timers vs TranscriptEndpoint message
Wire message types: TranscriptText, TranscriptEndpoint, TranscriptError, error
Ant-only build (behind feature('VOICE_MODE') gate)

context/QueuedMessageContext.tsx

Path: src/context/QueuedMessageContext.tsx

Purpose: React context for the queued message system — tracks messages waiting to be sent to Claude when the current turn completes.

Exports:

export const QueuedMessageContext: React.Context<QueuedMessage[]>
export function useQueuedMessages(): QueuedMessage[]
export function QueuedMessageProvider(props: { children: React.ReactNode }): JSX.Element

context/fpsMetrics.tsx

Path: src/context/fpsMetrics.tsx

Purpose: FPS (frames per second) measurement context for Ink terminal rendering performance monitoring.

Exports:

export function FpsMetricsProvider(props: { children: React.ReactNode }): JSX.Element
export function useFpsMetrics(): { fps: number; frameCount: number }

context/mailbox.tsx

Path: src/context/mailbox.tsx

Purpose: Provides inter-agent messaging context — the "mailbox" for receiving messages from other agents/workers.

Exports:

export type MailboxMessage = { from: string; content: string; timestamp: number }
export const MailboxContext: React.Context<MailboxMessage[]>
export function MailboxProvider(props: { children: React.ReactNode }): JSX.Element
export function useMailbox(): MailboxMessage[]

context/modalContext.tsx

Path: src/context/modalContext.tsx

Purpose: Context for managing modal dialog state — tracks which modal is currently open and provides open/close actions.

Exports:

export type ModalState = { isOpen: boolean; content: React.ReactNode | null }
export const ModalContext: React.Context<ModalState>
export function ModalProvider(props: { children: React.ReactNode }): JSX.Element
export function useModal(): { open: (content: React.ReactNode) => void; close: () => void }

context/notifications.tsx

Path: src/context/notifications.tsx

Purpose: Notification queue management — displays toast-style notifications in the status line with priority ordering, deduplication, fold/merge, and timeout handling.

Types:

type Priority = 'low' | 'medium' | 'high' | 'immediate'

type BaseNotification = {
  key: string
  invalidates?: string[]
  priority: Priority
  timeoutMs?: number
  fold?: (accumulator: Notification, incoming: Notification) => Notification
}

type TextNotification = BaseNotification & { text: string; color?: keyof Theme }
type JSXNotification = BaseNotification & { jsx: React.ReactNode }
export type Notification = TextNotification | JSXNotification

Exports:

const DEFAULT_TIMEOUT_MS = 8000

export function useNotifications(): {
  addNotification: (content: Notification) => void
  removeNotification: (key: string) => void
}

Key Logic:

Notification state lives in AppState (notifications.current + notifications.queue)
immediate priority: bypasses queue, shows immediately, re-queues current (non-immediate) notification
fold function: merges notifications with the same key (accumulator pattern)
Deduplication: only one notification per key in queue + current
invalidates[]: removes named notifications from queue and clears current if matching
DEFAULT_TIMEOUT_MS = 8000 (8 seconds); auto-advance to next queued after timeout
Module-level currentTimeoutId tracks the active auto-dismiss timer

context/overlayContext.tsx

Path: src/context/overlayContext.tsx

Purpose: Overlay tracking for Escape key coordination. Tracks which overlays (dialogs, selects) are currently open so the cancel handler doesn't misinterpret Escape presses.

Constants:

const NON_MODAL_OVERLAYS = new Set(['autocomplete'])

Exports:

export function useRegisterOverlay(id: string, enabled?: boolean): void
export function useIsOverlayActive(): boolean
export function useIsModalOverlayActive(): boolean

Key Logic:

State stored in AppState.activeOverlays: Set<string>
useRegisterOverlay(): registers on mount (useEffect), unregisters on unmount via cleanup
On overlay close: triggers instances.get(process.stdout)?.invalidatePrevFrame() (via useLayoutEffect) to force full-damage diff — prevents ghost cells from tall overlays (e.g. FuzzyPicker)
useIsOverlayActive(): activeOverlays.size > 0
useIsModalOverlayActive(): any overlay in set that is NOT in NON_MODAL_OVERLAYS

context/promptOverlayContext.tsx

Path: src/context/promptOverlayContext.tsx

Purpose: Context for prompt-level overlay management — tracks overlays that affect prompt input focus and behavior.

Exports:

export function useRegisterPromptOverlay(id: string, enabled?: boolean): void
export function useIsPromptOverlayActive(): boolean

context/stats.tsx

Path: src/context/stats.tsx

Purpose: In-process performance metrics store with reservoir sampling for histograms. Persists metrics to project config on process exit.

Constants:

RESERVOIR_SIZE = 1024 — reservoir sampling capacity for histograms

Types:

export type StatsStore = {
  increment(name: string, value?: number): void
  set(name: string, value: number): void
  observe(name: string, value: number): void
  add(name: string, value: string): void
  getAll(): Record<string, number>
}

Exports:

export function createStatsStore(): StatsStore
export const StatsContext: React.Context<StatsStore | null>
export function StatsProvider(props: { store?: StatsStore; children: React.ReactNode }): JSX.Element
export function useStats(): StatsStore
export function useCounter(name: string): (value?: number) => void
export function useGauge(name: string): (value: number) => void
export function useTimer(name: string): (value: number) => void
// ... additional hook exports

Key Logic:

createStatsStore(): creates a stats store with three internal data structures:
- metrics: Map<string, number> — counters and gauges
- histograms: Map<string, Histogram> — reservoir-sampled distributions
- sets: Map<string, Set<string>> — unique value sets (reported as .size)
observe(): histogram using reservoir sampling (Algorithm R) with RESERVOIR_SIZE = 1024
getAll(): returns flat Record<string, number> with histogram percentiles (_p50, _p95, _p99), min, max, avg, count
StatsProvider: flushes metrics to lastSessionMetrics in project config on process 'exit' event
useCounter() / useGauge() / useTimer(): memoized hooks returning bound store methods

context/voice.tsx

Path: src/context/voice.tsx

Purpose: Voice mode context — provides voice recording state, transcript, and connection status to the UI.

Exports:

export type VoiceContextValue = {
  isRecording: boolean
  transcript: string
  isConnecting: boolean
  error: string | null
  startRecording: () => void
  stopRecording: () => void
}

export const VoiceContext: React.Context<VoiceContextValue>
export function VoiceProvider(props: { children: React.ReactNode }): JSX.Element
export function useVoice(): VoiceContextValue

screens/Doctor.tsx

Path: src/screens/Doctor.tsx

Purpose: The /doctor command UI screen — displays system health diagnostics including version info, environment checks, MCP server status, sandbox status, keybinding warnings, and available updates.

Props:

type Props = {
  onDone: () => void
}

Internal Types:

type AgentInfo = {
  name: string
  version: string
  // ...
}

type VersionLockInfo = {
  locked: boolean
  version?: string
  // ...
}

Key Logic:

Uses getDoctorDiagnostic() for environment checks
Calls checkContextWarnings() for context-related issues
Loads dist tags with getNpmDistTags() and getGcsDistTags() (wrapped in Suspense)
Renders sub-sections: SandboxDoctorSection, ValidationErrorsList, KeybindingWarnings, McpParsingWarnings
Displays version comparison: current vs latest npm/GCS versions
Shows agent info, version lock status, and update channels

screens/REPL.tsx

Path: src/screens/REPL.tsx

Purpose: The main interactive REPL screen — the primary conversational UI that orchestrates the entire Claude Code interactive session.

Key Logic:

Manages the full conversation lifecycle: user input → API query → tool execution → response display
Handles all interactive features: conversation history, compaction, clear, file editing, permissions
Routes slash commands to command handlers
Manages modal dialogs (permissions, MCP approvals, etc.)
Integrates with all context providers: notifications, overlays, voice, stats
The largest component in the codebase, responsible for the overall user interaction loop

screens/ResumeConversation.tsx

Path: src/screens/ResumeConversation.tsx

Purpose: UI screen for the session resume flow — shows a list of recent sessions with previews and allows the user to select one to resume.

Key Logic:

Loads session index from disk
Renders SessionPreview components for each session
Handles keyboard navigation (arrow keys, Enter to select)
Filters sessions by project root or shows all
Passes selected session ID back to caller via callback

Cross-Cutting Architecture Notes

State Management Architecture

The codebase uses three distinct state layers:

bootstrap/state.ts — Global mutable singleton for session-scoped state (costs, model, telemetry). Intentionally a DAG leaf — imports nothing from services.
React AppState — UI state via Zustand-like store (state/AppState.ts). Accessed via useAppState() selectors and useSetAppState().
React Contexts — Domain-specific contexts (notifications, overlays, stats, voice) for scoped subtree state.

Analytics Architecture

Events flow through a multi-layer pipeline:

logEvent() → index.ts queue → sink.ts dispatch
  → [sampling check] → [isSinkKilled check]
  → datadog.ts (strips _PROTO_ keys)
  → firstPartyEventLogger.ts (hoists _PROTO_ keys to proto fields)

All analytics is disabled when: NODE_ENV === test, 3P providers (Bedrock/Vertex/Foundry), or isTelemetryDisabled().

Compact/Microcompact Architecture

Context compression has multiple layers:

apiMicrocompact.ts — API-native server-side editing (cache_edits) — no client-side mutation
microCompact.ts — Client-side tool result clearing (cached path + time-based path)
autoCompact.ts — Full conversation summarization trigger (threshold-based)
compact.ts — Full summarization implementation (LLM call)
sessionMemoryCompact.ts — Lighter session memory segment summarization

GrowthBook Feature Flag Naming Convention

All feature flags use obfuscated/mangled names with tengu_ prefix to prevent scraping:

Feature flags: tengu_prompt_cache_1h_config, tengu_session_memory, tengu_sm_compact, etc.
Kill switches: tengu_frond_boric (analytics sink killswitch)
Voice: tengu_cobalt_frost (Nova 3 STT)
AutoDream: tengu_onyx_plover
Coordinator mode: checked via feature('COORDINATOR_MODE') bundle flag

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Claude Code — Services, Context, State & Screens

Table of Contents

bootstrap/state.ts

coordinator/coordinatorMode.ts

server/types.ts

server/createDirectConnectSession.ts

server/directConnectManager.ts

services/analytics/config.ts

services/analytics/growthbook.ts

services/analytics/metadata.ts

services/analytics/index.ts

services/analytics/sink.ts

services/analytics/sinkKillswitch.ts

services/analytics/datadog.ts

services/analytics/firstPartyEventLogger.ts

services/analytics/firstPartyEventLoggingExporter.ts

services/api/bootstrap.ts

services/api/client.ts

services/api/claude.ts

services/api/dumpPrompts.ts

services/api/emptyUsage.ts

services/api/errorUtils.ts

services/api/errors.ts

services/api/filesApi.ts

services/api/firstTokenDate.ts

services/api/grove.ts

services/api/logging.ts

services/api/metricsOptOut.ts

services/api/overageCreditGrant.ts

services/api/promptCacheBreakDetection.ts

services/api/referral.ts

services/api/sessionIngress.ts

services/api/ultrareviewQuota.ts

services/api/usage.ts

services/api/withRetry.ts

services/AgentSummary/agentSummary.ts

services/autoDream/autoDream.ts

services/autoDream/config.ts

services/autoDream/consolidationLock.ts

services/autoDream/consolidationPrompt.ts

services/awaySummary.ts

services/claudeAiLimits.ts

services/claudeAiLimitsHook.ts

services/compact/apiMicrocompact.ts

services/compact/autoCompact.ts

services/compact/compact.ts

services/compact/compactWarningHook.ts

services/compact/compactWarningState.ts

services/compact/grouping.ts

services/compact/microCompact.ts

services/compact/postCompactCleanup.ts

services/compact/prompt.ts

services/compact/sessionMemoryCompact.ts

services/compact/timeBasedMCConfig.ts

services/diagnosticTracking.ts

services/internalLogging.ts

services/MagicDocs/magicDocs.ts

services/MagicDocs/prompts.ts

services/mcpServerApproval.tsx

services/mockRateLimits.ts

services/notifier.ts

services/preventSleep.ts

services/PromptSuggestion/promptSuggestion.ts

services/PromptSuggestion/speculation.ts

services/rateLimitMocking.ts

services/rateLimitMessages.ts

services/SessionMemory/prompts.ts

services/SessionMemory/sessionMemory.ts

services/SessionMemory/sessionMemoryUtils.ts

services/tokenEstimation.ts

services/vcr.ts

services/voice.ts

services/voiceKeyterms.ts

services/voiceStreamSTT.ts

context/QueuedMessageContext.tsx

context/fpsMetrics.tsx

context/mailbox.tsx

context/modalContext.tsx

context/notifications.tsx

93 KiB

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