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import { feature } from 'bun:bundle'
import type {
BetaToolChoiceAuto,
BetaToolChoiceTool,
} from '@anthropic-ai/sdk/resources/beta/messages/messages.mjs'
import type { ContentBlockParam } from '@anthropic-ai/sdk/resources/messages.mjs'
import { randomUUID } from 'crypto'
import last from 'lodash-es/last.js'
import {
getSessionId,
isSessionPersistenceDisabled,
} from 'src/bootstrap/state.js'
import type {
PermissionMode,
SDKCompactBoundaryMessage,
SDKMessage,
SDKPermissionDenial,
SDKStatus,
SDKUserMessageReplay,
} from 'src/entrypoints/agentSdkTypes.js'
import { accumulateUsage, updateUsage } from 'src/services/api/claude.js'
import type { NonNullableUsage } from 'src/services/api/logging.js'
import { EMPTY_USAGE } from 'src/services/api/logging.js'
import stripAnsi from 'strip-ansi'
import type { Command } from './commands.js'
import { getSlashCommandToolSkills } from './commands.js'
import {
LOCAL_COMMAND_STDERR_TAG,
LOCAL_COMMAND_STDOUT_TAG,
} from './constants/xml.js'
import {
getModelUsage,
getTotalAPIDuration,
getTotalCost,
} from './cost-tracker.js'
import type { CanUseToolFn } from './hooks/useCanUseTool.js'
import { loadMemoryPrompt } from './memdir/memdir.js'
import { hasAutoMemPathOverride } from './memdir/paths.js'
import { query, type QueryParams } from './query.js'
import type { Terminal } from './query/transitions.js'
import { categorizeRetryableAPIError } from './services/api/errors.js'
import type { MCPServerConnection } from './services/mcp/types.js'
import type { AppState } from './state/AppState.js'
import { type Tools, type ToolUseContext, toolMatchesName } from './Tool.js'
import type { AgentDefinition } from './tools/AgentTool/loadAgentsDir.js'
import { SYNTHETIC_OUTPUT_TOOL_NAME } from './tools/SyntheticOutputTool/SyntheticOutputTool.js'
import {
collectWebFetchSourcesFromMessages,
repairAssistantMessageWebFetchProvenance,
repairWebFetchProvenanceInText,
} from './tools/WebFetchTool/sourceProvenance.js'
import type {
Message,
RequestStartEvent,
StreamEvent,
TombstoneMessage,
ToolUseSummaryMessage,
} from './types/message.js'
import type { OrphanedPermission } from './types/textInputTypes.js'
import { createAbortController } from './utils/abortController.js'
import type { AttributionState } from './utils/commitAttribution.js'
import { getGlobalConfig } from './utils/config.js'
import { getCwd } from './utils/cwd.js'
import { isBareMode, isEnvTruthy } from './utils/envUtils.js'
import { getFastModeState } from './utils/fastMode.js'
import {
type FileHistoryState,
fileHistoryEnabled,
fileHistoryMakeSnapshot,
} from './utils/fileHistory.js'
import {
cloneFileStateCache,
type FileStateCache,
} from './utils/fileStateCache.js'
import { logForDebugging } from './utils/debug.js'
import { headlessProfilerCheckpoint } from './utils/headlessProfiler.js'
import { registerStructuredOutputEnforcement } from './utils/hooks/hookHelpers.js'
import { getInMemoryErrors } from './utils/log.js'
import { countToolCalls, SYNTHETIC_MESSAGES } from './utils/messages.js'
import { isDeferredHeadlessPluginStartupSurfacesEnabled } from './bootstrap/state.js'
import {
getMainLoopModel,
parseUserSpecifiedModel,
} from './utils/model/model.js'
import { loadAllPluginsCacheOnly } from './utils/plugins/pluginLoader.js'
import {
type ProcessUserInputContext,
processUserInput,
} from './utils/processUserInput/processUserInput.js'
import { fetchSystemPromptParts } from './utils/queryContext.js'
import { setCwd } from './utils/Shell.js'
import {
flushSessionStorage,
recordTranscript,
} from './utils/sessionStorage.js'
import { asSystemPrompt } from './utils/systemPromptType.js'
import { resolveThemeSetting } from './utils/systemTheme.js'
import {
shouldEnableThinkingByDefault,
type ThinkingConfig,
} from './utils/thinking.js'
// Lazy: MessageSelector.tsx pulls React/ink; only needed for message filtering at query time
/* eslint-disable @typescript-eslint/no-require-imports */
const messageSelector =
(): typeof import('src/components/MessageSelector.js') =>
require('src/components/MessageSelector.js')
import {
localCommandOutputToSDKAssistantMessage,
toSDKCompactMetadata,
} from './utils/messages/mappers.js'
import {
buildSystemInitMessage,
sdkCompatToolName,
} from './utils/messages/systemInit.js'
import {
getScratchpadDir,
isScratchpadEnabled,
} from './utils/permissions/filesystem.js'
/* eslint-enable @typescript-eslint/no-require-imports */
import {
handleOrphanedPermission,
isResultSuccessful,
normalizeMessage,
} from './utils/queryHelpers.js'
// Dead code elimination: conditional import for coordinator mode
/* eslint-disable @typescript-eslint/no-require-imports */
const getCoordinatorUserContext: (
mcpClients: ReadonlyArray<{ name: string }>,
scratchpadDir?: string,
) => { [k: string]: string } = feature('COORDINATOR_MODE')
? require('./coordinator/coordinatorMode.js').getCoordinatorUserContext
: () => ({})
/* eslint-enable @typescript-eslint/no-require-imports */
// Dead code elimination: conditional import for snip compaction
/* eslint-disable @typescript-eslint/no-require-imports */
const snipModule = feature('HISTORY_SNIP')
? (require('./services/compact/snipCompact.js') as typeof import('./services/compact/snipCompact.js'))
: null
const snipProjection = feature('HISTORY_SNIP')
? (require('./services/compact/snipProjection.js') as typeof import('./services/compact/snipProjection.js'))
: null
/* eslint-enable @typescript-eslint/no-require-imports */
export type QueryEngineConfig = {
cwd: string
tools: Tools
commands: Command[]
mcpClients: MCPServerConnection[]
agents: AgentDefinition[]
canUseTool: CanUseToolFn
getAppState: () => AppState
setAppState: (f: (prev: AppState) => AppState) => void
initialMessages?: Message[]
readFileCache: FileStateCache
customSystemPrompt?: string
appendSystemPrompt?: string
userSpecifiedModel?: string
fallbackModel?: string
thinkingConfig?: ThinkingConfig
maxTurns?: number
maxBudgetUsd?: number
taskBudget?: { total: number }
jsonSchema?: Record<string, unknown>
toolChoice?: BetaToolChoiceTool | BetaToolChoiceAuto
verbose?: boolean
replayUserMessages?: boolean
/** Handler for URL elicitations triggered by MCP tool -32042 errors. */
handleElicitation?: ToolUseContext['handleElicitation']
includePartialMessages?: boolean
setSDKStatus?: (status: SDKStatus) => void
abortController?: AbortController
orphanedPermission?: OrphanedPermission
/**
* Snip-boundary handler: receives each yielded system message plus the
* current mutableMessages store. Returns undefined if the message is not a
* snip boundary; otherwise returns the replayed snip result. Injected by
* ask() when HISTORY_SNIP is enabled so feature-gated strings stay inside
* the gated module (keeps QueryEngine free of excluded strings and testable
* despite feature() returning false under bun test). SDK-only: the REPL
* keeps full history for UI scrollback and projects on demand via
* projectSnippedView; QueryEngine truncates here to bound memory in long
* headless sessions (no UI to preserve).
*/
snipReplay?: (
yieldedSystemMsg: Message,
store: Message[],
) => { messages: Message[]; executed: boolean } | undefined
}
/**
* QueryEngine owns the query lifecycle and session state for a conversation.
* It extracts the core logic from ask() into a standalone class that can be
* used by both the headless/SDK path and (in a future phase) the REPL.
*
* One QueryEngine per conversation. Each submitMessage() call starts a new
* turn within the same conversation. State (messages, file cache, usage, etc.)
* persists across turns.
*/
export class QueryEngine {
private config: QueryEngineConfig
private mutableMessages: Message[]
private abortController: AbortController
private permissionDenials: SDKPermissionDenial[]
private totalUsage: NonNullableUsage
private hasHandledOrphanedPermission = false
private readFileState: FileStateCache
// Turn-scoped skill discovery tracking (feeds was_discovered on
// ncode_skill_tool_invocation). Must persist across the two
// processUserInputContext rebuilds inside submitMessage, but is cleared
// at the start of each submitMessage to avoid unbounded growth across
// many turns in SDK mode.
private discoveredSkillNames = new Set<string>()
private loadedNestedMemoryPaths = new Set<string>()
constructor(config: QueryEngineConfig) {
this.config = config
this.mutableMessages = config.initialMessages ?? []
this.abortController = config.abortController ?? createAbortController()
this.permissionDenials = []
this.readFileState = config.readFileCache
this.totalUsage = EMPTY_USAGE
}
async *submitMessage(
prompt: string | ContentBlockParam[],
options?: { uuid?: string; isMeta?: boolean },
): AsyncGenerator<SDKMessage, void, unknown> {
const {
cwd,
commands,
tools,
mcpClients,
verbose = false,
thinkingConfig,
maxTurns,
maxBudgetUsd,
taskBudget,
canUseTool,
customSystemPrompt,
appendSystemPrompt,
userSpecifiedModel,
fallbackModel,
jsonSchema,
getAppState,
setAppState,
replayUserMessages = false,
includePartialMessages = false,
agents = [],
setSDKStatus,
orphanedPermission,
} = this.config
this.discoveredSkillNames.clear()
setCwd(cwd)
const persistSession = !isSessionPersistenceDisabled()
const startTime = Date.now()
// Wrap canUseTool to track permission denials
const wrappedCanUseTool: CanUseToolFn = async (
tool,
input,
toolUseContext,
assistantMessage,
toolUseID,
forceDecision,
) => {
const result = await canUseTool(
tool,
input,
toolUseContext,
assistantMessage,
toolUseID,
forceDecision,
)
// Track denials for SDK reporting
if (result.behavior !== 'allow') {
this.permissionDenials.push({
tool_name: sdkCompatToolName(tool.name),
tool_use_id: toolUseID,
tool_input: input,
})
}
return result
}
const initialAppState = getAppState()
const initialMainLoopModel = userSpecifiedModel
? parseUserSpecifiedModel(userSpecifiedModel)
: getMainLoopModel()
const initialThinkingConfig: ThinkingConfig = thinkingConfig
? thinkingConfig
: shouldEnableThinkingByDefault() !== false
? { type: 'adaptive' }
: { type: 'disabled' }
headlessProfilerCheckpoint('before_getSystemPrompt')
// Narrow once so TS tracks the type through the conditionals below.
const customPrompt =
typeof customSystemPrompt === 'string' ? customSystemPrompt : undefined
const {
defaultSystemPrompt,
userContext: baseUserContext,
systemContext,
} = await fetchSystemPromptParts({
tools,
mainLoopModel: initialMainLoopModel,
additionalWorkingDirectories: Array.from(
initialAppState.toolPermissionContext.additionalWorkingDirectories.keys(),
),
mcpClients,
customSystemPrompt: customPrompt,
})
headlessProfilerCheckpoint('after_getSystemPrompt')
const userContext = {
...baseUserContext,
...getCoordinatorUserContext(
mcpClients,
isScratchpadEnabled() ? getScratchpadDir() : undefined,
),
}
// When an SDK caller provides a custom system prompt AND has set
// CLAUDE_COWORK_MEMORY_PATH_OVERRIDE, inject the memory-mechanics prompt.
// The env var is an explicit opt-in signal — the caller has wired up
// a memory directory and needs NCode to know how to use it (which
// Write/Edit tools to call, MEMORY.md filename, loading semantics).
// The caller can layer their own policy text via appendSystemPrompt.
const memoryMechanicsPrompt =
customPrompt !== undefined && hasAutoMemPathOverride()
? await loadMemoryPrompt()
: null
const systemPrompt = asSystemPrompt([
...(customPrompt !== undefined ? [customPrompt] : defaultSystemPrompt),
...(memoryMechanicsPrompt ? [memoryMechanicsPrompt] : []),
...(appendSystemPrompt ? [appendSystemPrompt] : []),
])
// Register function hook for structured output enforcement
const hasStructuredOutputTool = tools.some(t =>
toolMatchesName(t, SYNTHETIC_OUTPUT_TOOL_NAME),
)
if (jsonSchema && hasStructuredOutputTool) {
registerStructuredOutputEnforcement(setAppState, getSessionId())
}
let processUserInputContext: ProcessUserInputContext = {
messages: this.mutableMessages,
// Slash commands that mutate the message array (e.g. /force-snip)
// call setMessages(fn). In interactive mode this writes back to
// AppState; in print mode we write back to mutableMessages so the
// rest of the query loop (push at :389, snapshot at :392) sees
// the result. The second processUserInputContext below (after
// slash-command processing) keeps the no-op — nothing else calls
// setMessages past that point.
setMessages: fn => {
this.mutableMessages = fn(this.mutableMessages)
},
onChangeAPIKey: () => {},
handleElicitation: this.config.handleElicitation,
options: {
commands,
debug: false, // we use stdout, so don't want to clobber it
tools,
verbose,
mainLoopModel: initialMainLoopModel,
thinkingConfig: initialThinkingConfig,
mcpClients,
mcpResources: {},
ideInstallationStatus: null,
isNonInteractiveSession: true,
customSystemPrompt,
appendSystemPrompt,
agentDefinitions: { activeAgents: agents, allAgents: [] },
theme: resolveThemeSetting(getGlobalConfig().theme),
maxBudgetUsd,
},
getAppState,
setAppState,
abortController: this.abortController,
readFileState: this.readFileState,
nestedMemoryAttachmentTriggers: new Set<string>(),
loadedNestedMemoryPaths: this.loadedNestedMemoryPaths,
dynamicSkillDirTriggers: new Set<string>(),
discoveredSkillNames: this.discoveredSkillNames,
setInProgressToolUseIDs: () => {},
setResponseLength: () => {},
updateFileHistoryState: (
updater: (prev: FileHistoryState) => FileHistoryState,
) => {
setAppState(prev => {
const updated = updater(prev.fileHistory)
if (updated === prev.fileHistory) return prev
return { ...prev, fileHistory: updated }
})
},
updateAttributionState: (
updater: (prev: AttributionState) => AttributionState,
) => {
setAppState(prev => {
const updated = updater(prev.attribution)
if (updated === prev.attribution) return prev
return { ...prev, attribution: updated }
})
},
setSDKStatus,
}
// Handle orphaned permission (only once per engine lifetime)
if (orphanedPermission && !this.hasHandledOrphanedPermission) {
this.hasHandledOrphanedPermission = true
for await (const message of handleOrphanedPermission(
orphanedPermission,
tools,
this.mutableMessages,
processUserInputContext,
)) {
yield message
}
}
const {
messages: messagesFromUserInput,
shouldQuery,
allowedTools,
model: modelFromUserInput,
resultText,
} = await processUserInput({
input: prompt,
mode: 'prompt',
setToolJSX: () => {},
context: {
...processUserInputContext,
messages: this.mutableMessages,
},
messages: this.mutableMessages,
uuid: options?.uuid,
isMeta: options?.isMeta,
querySource: 'sdk',
})
// Push new messages, including user input and any attachments
this.mutableMessages.push(...messagesFromUserInput)
// Update params to reflect updates from processing /slash commands
const messages = [...this.mutableMessages]
// Persist the user's message(s) to transcript BEFORE entering the query
// loop. The for-await below only calls recordTranscript when ask() yields
// an assistant/user/compact_boundary message — which doesn't happen until
// the API responds. If the process is killed before that (e.g. user clicks
// Stop in cowork seconds after send), the transcript is left with only
// queue-operation entries; getLastSessionLog filters those out, returns
// null, and --resume fails with "No conversation found". Writing now makes
// the transcript resumable from the point the user message was accepted,
// even if no API response ever arrives.
//
// --bare / SIMPLE: fire-and-forget. Scripted calls don't --resume after
// kill-mid-request. The await is ~4ms on SSD, ~30ms under disk contention
// — the single largest controllable critical-path cost after module eval.
// Transcript is still written (for post-hoc debugging); just not blocking.
if (persistSession && messagesFromUserInput.length > 0) {
const transcriptPromise = recordTranscript(messages)
if (isBareMode()) {
void transcriptPromise
} else {
await transcriptPromise
if (
isEnvTruthy(process.env.CLAUDE_CODE_EAGER_FLUSH) ||
isEnvTruthy(process.env.CLAUDE_CODE_IS_COWORK)
) {
await flushSessionStorage()
}
}
}
// Filter messages that should be acknowledged after transcript
const replayableMessages = messagesFromUserInput.filter(
msg =>
(msg.type === 'user' &&
!msg.isMeta && // Skip synthetic caveat messages
!msg.toolUseResult && // Skip tool results (they'll be acked from query)
messageSelector().selectableUserMessagesFilter(msg)) || // Skip non-user-authored messages (task notifications, etc.)
(msg.type === 'system' && msg.subtype === 'compact_boundary'), // Always ack compact boundaries
)
const messagesToAck = replayUserMessages ? replayableMessages : []
// Update the ToolPermissionContext based on user input processing (as necessary)
setAppState(prev => ({
...prev,
toolPermissionContext: {
...prev.toolPermissionContext,
alwaysAllowRules: {
...prev.toolPermissionContext.alwaysAllowRules,
command: allowedTools,
},
},
}))
const mainLoopModel = modelFromUserInput ?? initialMainLoopModel
// Recreate after processing the prompt to pick up updated messages and
// model (from slash commands).
processUserInputContext = {
messages,
setMessages: () => {},
onChangeAPIKey: () => {},
handleElicitation: this.config.handleElicitation,
options: {
commands,
debug: false,
tools,
verbose,
mainLoopModel,
thinkingConfig: initialThinkingConfig,
mcpClients,
mcpResources: {},
ideInstallationStatus: null,
isNonInteractiveSession: true,
customSystemPrompt,
appendSystemPrompt,
theme: resolveThemeSetting(getGlobalConfig().theme),
agentDefinitions: { activeAgents: agents, allAgents: [] },
maxBudgetUsd,
},
getAppState,
setAppState,
abortController: this.abortController,
readFileState: this.readFileState,
nestedMemoryAttachmentTriggers: new Set<string>(),
loadedNestedMemoryPaths: this.loadedNestedMemoryPaths,
dynamicSkillDirTriggers: new Set<string>(),
discoveredSkillNames: this.discoveredSkillNames,
setInProgressToolUseIDs: () => {},
setResponseLength: () => {},
updateFileHistoryState: processUserInputContext.updateFileHistoryState,
updateAttributionState: processUserInputContext.updateAttributionState,
setSDKStatus,
}
headlessProfilerCheckpoint('before_skills_plugins')
// Cache-only: headless/SDK/CCR startup must not block on network for
// ref-tracked plugins. CCR populates the cache via CLAUDE_CODE_SYNC_PLUGIN_INSTALL
// (headlessPluginInstall) or CLAUDE_CODE_PLUGIN_SEED_DIR before this runs;
// SDK callers that need fresh source can call /reload-plugins.
const [skills, enabledPlugins] =
isDeferredHeadlessPluginStartupSurfacesEnabled()
? (logForDebugging(
'[STARTUP] Skipping eager plugin-backed skills/plugins during deferred headless startup',
),
[[], []] as const)
: await Promise.all([
getSlashCommandToolSkills(getCwd()),
loadAllPluginsCacheOnly().then(({ enabled }) => enabled),
])
headlessProfilerCheckpoint('after_skills_plugins')
yield buildSystemInitMessage({
tools,
mcpClients,
model: mainLoopModel,
permissionMode: initialAppState.toolPermissionContext
.mode as PermissionMode, // TODO: avoid the cast
commands,
agents,
skills,
plugins: enabledPlugins,
fastMode: initialAppState.fastMode,
})
// Record when system message is yielded for headless latency tracking
headlessProfilerCheckpoint('system_message_yielded')
if (!shouldQuery) {
// Return the results of local slash commands.
// Use messagesFromUserInput (not replayableMessages) for command output
// because selectableUserMessagesFilter excludes local-command-stdout tags.
for (const msg of messagesFromUserInput) {
if (
msg.type === 'user' &&
typeof msg.message.content === 'string' &&
(msg.message.content.includes(`<${LOCAL_COMMAND_STDOUT_TAG}>`) ||
msg.message.content.includes(`<${LOCAL_COMMAND_STDERR_TAG}>`) ||
msg.isCompactSummary)
) {
yield {
type: 'user',
message: {
...msg.message,
content: stripAnsi(msg.message.content),
},
session_id: getSessionId(),
parent_tool_use_id: null,
uuid: msg.uuid,
timestamp: msg.timestamp,
isReplay: !msg.isCompactSummary,
isSynthetic: msg.isMeta || msg.isVisibleInTranscriptOnly,
} as SDKUserMessageReplay
}
// Local command output — yield as a synthetic assistant message so
// RC renders it as assistant-style text rather than a user bubble.
// Emitted as assistant (not the dedicated SDKLocalCommandOutputMessage
// system subtype) so mobile clients + session-ingress can parse it.
if (
msg.type === 'system' &&
msg.subtype === 'local_command' &&
typeof msg.content === 'string' &&
(msg.content.includes(`<${LOCAL_COMMAND_STDOUT_TAG}>`) ||
msg.content.includes(`<${LOCAL_COMMAND_STDERR_TAG}>`))
) {
yield localCommandOutputToSDKAssistantMessage(msg.content, msg.uuid)
}
if (msg.type === 'system' && msg.subtype === 'compact_boundary') {
yield {
type: 'system',
subtype: 'compact_boundary' as const,
session_id: getSessionId(),
uuid: msg.uuid,
compact_metadata: toSDKCompactMetadata(msg.compactMetadata),
} as SDKCompactBoundaryMessage
}
}
if (persistSession) {
await recordTranscript(messages)
if (
isEnvTruthy(process.env.CLAUDE_CODE_EAGER_FLUSH) ||
isEnvTruthy(process.env.CLAUDE_CODE_IS_COWORK)
) {
await flushSessionStorage()
}
}
yield {
type: 'result',
subtype: 'success',
is_error: false,
duration_ms: Date.now() - startTime,
duration_api_ms: getTotalAPIDuration(),
num_turns: messages.length - 1,
result: resultText ?? '',
stop_reason: null,
session_id: getSessionId(),
total_cost_usd: getTotalCost(),
usage: this.totalUsage,
modelUsage: getModelUsage(),
permission_denials: this.permissionDenials,
fast_mode_state: getFastModeState(
mainLoopModel,
initialAppState.fastMode,
),
uuid: randomUUID(),
}
return
}
if (fileHistoryEnabled() && persistSession) {
messagesFromUserInput
.filter(messageSelector().selectableUserMessagesFilter)
.forEach(message => {
void fileHistoryMakeSnapshot(
(updater: (prev: FileHistoryState) => FileHistoryState) => {
setAppState(prev => ({
...prev,
fileHistory: updater(prev.fileHistory),
}))
},
message.uuid,
)
})
}
// Track current message usage (reset on each message_start)
let currentMessageUsage: NonNullableUsage = EMPTY_USAGE
let turnCount = 1
let hasAcknowledgedInitialMessages = false
// Track structured output from StructuredOutput tool calls
let structuredOutputFromTool: unknown
// Track the last stop_reason from assistant messages
let lastStopReason: string | null = null
// Reference-based watermark so error_during_execution's errors[] is
// turn-scoped. A length-based index breaks when the 100-entry ring buffer
// shift()s during the turn — the index slides. If this entry is rotated
// out, lastIndexOf returns -1 and we include everything (safe fallback).
const errorLogWatermark = getInMemoryErrors().at(-1)
// Snapshot count before this query for delta-based retry limiting
const initialStructuredOutputCalls = jsonSchema
? countToolCalls(this.mutableMessages, SYNTHETIC_OUTPUT_TOOL_NAME)
: 0
for await (const rawMessage of query({
messages,
systemPrompt,
userContext,
systemContext,
canUseTool: wrappedCanUseTool,
toolUseContext: processUserInputContext,
fallbackModel,
querySource: 'sdk',
maxTurns,
toolChoice: this.config.toolChoice,
taskBudget,
})) {
let message = rawMessage
if (message.type === 'assistant') {
message = repairAssistantMessageWebFetchProvenance(
message,
this.mutableMessages,
)
}
// Record assistant, user, and compact boundary messages
if (
message.type === 'assistant' ||
message.type === 'user' ||
(message.type === 'system' && message.subtype === 'compact_boundary')
) {
// Before writing a compact boundary, flush any in-memory-only
// messages up through the preservedSegment tail. Attachments and
// progress are now recorded inline (their switch cases below), but
// this flush still matters for the preservedSegment tail walk.
// If the SDK subprocess restarts before then (claude-desktop kills
// between turns), tailUuid points to a never-written message →
// applyPreservedSegmentRelinks fails its tail→head walk → returns
// without pruning → resume loads full pre-compact history.
if (
persistSession &&
message.type === 'system' &&
message.subtype === 'compact_boundary'
) {
const tailUuid = message.compactMetadata?.preservedSegment?.tailUuid
if (tailUuid) {
const tailIdx = this.mutableMessages.findLastIndex(
m => m.uuid === tailUuid,
)
if (tailIdx !== -1) {
await recordTranscript(this.mutableMessages.slice(0, tailIdx + 1))
}
}
}
messages.push(message)
if (persistSession) {
// Fire-and-forget for assistant messages. claude.ts yields one
// assistant message per content block, then mutates the last
// one's message.usage/stop_reason on message_delta — relying on
// the write queue's 100ms lazy jsonStringify. Awaiting here
// blocks ask()'s generator, so message_delta can't run until
// every block is consumed; the drain timer (started at block 1)
// elapses first. Interactive CC doesn't hit this because
// useLogMessages.ts fire-and-forgets. enqueueWrite is
// order-preserving so fire-and-forget here is safe.
if (message.type === 'assistant') {
void recordTranscript(messages)
} else {
await recordTranscript(messages)
}
}
// Acknowledge initial user messages after first transcript recording
if (!hasAcknowledgedInitialMessages && messagesToAck.length > 0) {
hasAcknowledgedInitialMessages = true
for (const msgToAck of messagesToAck) {
if (msgToAck.type === 'user') {
yield {
type: 'user',
message: msgToAck.message,
session_id: getSessionId(),
parent_tool_use_id: null,
uuid: msgToAck.uuid,
timestamp: msgToAck.timestamp,
isReplay: true,
} as SDKUserMessageReplay
}
}
}
}
if (message.type === 'user') {
turnCount++
}
switch (message.type) {
case 'tombstone':
// Tombstone messages are control signals for removing messages, skip them
break
case 'assistant':
// Capture stop_reason if already set (synthetic messages). For
// streamed responses, this is null at content_block_stop time;
// the real value arrives via message_delta (handled below).
if (message.message.stop_reason != null) {
lastStopReason = message.message.stop_reason
}
this.mutableMessages.push(message)
yield* normalizeMessage(message)
break
case 'progress':
this.mutableMessages.push(message)
// Record inline so the dedup loop in the next ask() call sees it
// as already-recorded. Without this, deferred progress interleaves
// with already-recorded tool_results in mutableMessages, and the
// dedup walk freezes startingParentUuid at the wrong message —
// forking the chain and orphaning the conversation on resume.
if (persistSession) {
messages.push(message)
void recordTranscript(messages)
}
yield* normalizeMessage(message)
break
case 'user':
this.mutableMessages.push(message)
yield* normalizeMessage(message)
break
case 'stream_event':
if (message.event.type === 'message_start') {
// Reset current message usage for new message
currentMessageUsage = EMPTY_USAGE
currentMessageUsage = updateUsage(
currentMessageUsage,
message.event.message.usage,
)
}
if (message.event.type === 'message_delta') {
currentMessageUsage = updateUsage(
currentMessageUsage,
message.event.usage,
)
// Capture stop_reason from message_delta. The assistant message
// is yielded at content_block_stop with stop_reason=null; the
// real value only arrives here (see claude.ts message_delta
// handler). Without this, result.stop_reason is always null.
if (message.event.delta.stop_reason != null) {
lastStopReason = message.event.delta.stop_reason
}
}
if (message.event.type === 'message_stop') {
// Accumulate current message usage into total
this.totalUsage = accumulateUsage(
this.totalUsage,
currentMessageUsage,
)
}
if (includePartialMessages) {
yield {
type: 'stream_event' as const,
event: message.event,
session_id: getSessionId(),
parent_tool_use_id: null,
uuid: randomUUID(),
}
}
break
case 'attachment':
this.mutableMessages.push(message)
// Record inline (same reason as progress above).
if (persistSession) {
messages.push(message)
void recordTranscript(messages)
}
// Extract structured output from StructuredOutput tool calls
if (message.attachment.type === 'structured_output') {
structuredOutputFromTool = message.attachment.data
}
// Handle max turns reached signal from query.ts
else if (message.attachment.type === 'max_turns_reached') {
if (persistSession) {
if (
isEnvTruthy(process.env.CLAUDE_CODE_EAGER_FLUSH) ||
isEnvTruthy(process.env.CLAUDE_CODE_IS_COWORK)
) {
await flushSessionStorage()
}
}
yield {
type: 'result',
subtype: 'error_max_turns',
duration_ms: Date.now() - startTime,
duration_api_ms: getTotalAPIDuration(),
is_error: true,
num_turns: message.attachment.turnCount,
stop_reason: lastStopReason,
session_id: getSessionId(),
total_cost_usd: getTotalCost(),
usage: this.totalUsage,
modelUsage: getModelUsage(),
permission_denials: this.permissionDenials,
fast_mode_state: getFastModeState(
mainLoopModel,
initialAppState.fastMode,
),
uuid: randomUUID(),
errors: [
`Reached maximum number of turns (${message.attachment.maxTurns})`,
],
}
return
}
// Yield queued_command attachments as SDK user message replays
else if (
replayUserMessages &&
message.attachment.type === 'queued_command'
) {
yield {
type: 'user',
message: {
role: 'user' as const,
content: message.attachment.prompt,
},
session_id: getSessionId(),
parent_tool_use_id: null,
uuid: message.attachment.source_uuid || message.uuid,
timestamp: message.timestamp,
isReplay: true,
} as SDKUserMessageReplay
}
break
case 'stream_request_start':
// Don't yield stream request start messages
break
case 'system': {
// Snip boundary: replay on our store to remove zombie messages and
// stale markers. The yielded boundary is a signal, not data to push —
// the replay produces its own equivalent boundary. Without this,
// markers persist and re-trigger on every turn, and mutableMessages
// never shrinks (memory leak in long SDK sessions). The subtype
// check lives inside the injected callback so feature-gated strings
// stay out of this file (excluded-strings check).
const snipResult = this.config.snipReplay?.(
message,
this.mutableMessages,
)
if (snipResult !== undefined) {
if (snipResult.executed) {
this.mutableMessages.length = 0
this.mutableMessages.push(...snipResult.messages)
}
break
}
this.mutableMessages.push(message)
// Yield compact boundary messages to SDK
if (
message.subtype === 'compact_boundary' &&
message.compactMetadata
) {
// Release pre-compaction messages for GC. The boundary was just
// pushed so it's the last element. query.ts already uses
// getMessagesAfterCompactBoundary() internally, so only
// post-boundary messages are needed going forward.
const mutableBoundaryIdx = this.mutableMessages.length - 1
if (mutableBoundaryIdx > 0) {
this.mutableMessages.splice(0, mutableBoundaryIdx)
}
const localBoundaryIdx = messages.length - 1
if (localBoundaryIdx > 0) {
messages.splice(0, localBoundaryIdx)
}
yield {
type: 'system',
subtype: 'compact_boundary' as const,
session_id: getSessionId(),
uuid: message.uuid,
compact_metadata: toSDKCompactMetadata(message.compactMetadata),
}
}
if (message.subtype === 'api_error') {
yield {
type: 'system',
subtype: 'api_retry' as const,
attempt: message.retryAttempt,
max_retries: message.maxRetries,
retry_delay_ms: message.retryInMs,
error_status: message.error.status ?? null,
error: categorizeRetryableAPIError(message.error),
session_id: getSessionId(),
uuid: message.uuid,
}
}
// Don't yield other system messages in headless mode
break
}
case 'tool_use_summary':
// Yield tool use summary messages to SDK
yield {
type: 'tool_use_summary' as const,
summary: message.summary,
preceding_tool_use_ids: message.precedingToolUseIds,
session_id: getSessionId(),
uuid: message.uuid,
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