## Summary
- Default `max_tokens` was hardcoded to 1024, causing truncated
responses for most use cases
- Increased default from 1024 to 4096 while still respecting
user-provided `maxTokens`
Fixes#2354
## Test plan
- [x] Added test verifying default max_tokens is 4096 when not specified
- [x] Added test verifying user-provided maxTokens is passed through
- [x] All existing anthropic adapter tests pass
## Summary
- Providers like `@ai-sdk/openai-compatible` emit sequential IDs
(`txt-0`, `reasoning-0`, `msg-0`) that are treated as unique but collide
across requests
- The existing check only caught the literal `"0"` — expanded to match
the `^(txt|reasoning|msg)-0$` pattern
- Both `text-start` and `reasoning-start` event handlers now use
`randomUUID()` for these non-unique IDs
## Test plan
- [x] Added `provider-id-collision.test.ts` with 4 tests covering txt-0,
reasoning-0, msg-0, and legitimate ID preservation
- [x] All 1226 runtime tests pass (including existing
config-tools-execution tests)
Fixes#3410, #3623
## Summary
- `onAfterRequest` middleware callback was called with `{}` instead of
actual hook parameters
- Now forwards `threadId`, `runId`, `inputMessages`, `outputMessages`,
and `url` from the v2 runtime's `hookParams`
- The `onBeforeRequest` handler at line 566 already did this correctly;
this fix makes `onAfterRequest` consistent
## Test plan
- [x] Added `on-after-request.test.ts` verifying the callback receives
threadId and runId (not empty object)
- [x] All 1226 runtime tests pass
Fixes#2124
## Summary
Fixes#2450
Token trimming in the Anthropic adapter could remove assistant messages
containing `tool_use` blocks while keeping the corresponding user
messages with `tool_result` blocks. Anthropic's API rejects orphaned
`tool_result` messages. This adds a post-processing step that removes
orphaned `tool_result` blocks after trimming.
## Test plan
- [ ] Verify token trimming preserves tool_use/tool_result pairing
- [ ] Verify orphaned tool_result blocks are removed
- [ ] Verify messages with mixed content (tool_result + text) retain
non-orphaned content
## Summary
Fixes#2405
Both OpenAI and Anthropic adapters used a hardcoded token limit for
message trimming. This adds an optional `maxInputTokens` constructor
parameter to both adapter classes, allowing consumers to override the
default context window limit.
## Test plan
- [ ] Verify default behavior unchanged when `maxInputTokens` not
provided
- [ ] Verify custom `maxInputTokens` is passed through to
`limitMessagesToTokenCount`
## Summary
Fixes#2504
When Anthropic returns a `tool_use` block for a tool not registered in
the current action set, the adapter would crash trying to process it.
This adds a check against known action names and skips unknown tool_use
blocks gracefully.
## Test plan
- [ ] Verify known tools are still processed normally
- [ ] Verify unknown tool_use blocks are skipped without crashing
## Summary
- langchain-mcp-adapters sends tool call result content as an array of
`{type:"text", text:string}` objects
- Extracts and joins text parts so downstream consumers always receive a
plain string
Closes#2922
Closes#3141
`applyCredentialsToAgents`/`applyCredentialsToAgent` were defined but
never called from `initialize()`, `setAgents__unsafe_dev_only()`, or
`addAgent__unsafe_dev_only()`. Only remote agents received credentials
via constructor. Local agents now receive credentials alongside headers.
Split from #3838.
Closes#3741
Add `toolCallId` prop to all three status branches (InProgress,
Executing, Complete) of the ToolCallRenderer, and update the
`ReactToolCallRenderer` type to include it in the discriminated union.
Split from #3838.
Closes#1936
`extractParametersFromSchema` now preserves enum values as structured
data on string parameters, recursively extracts nested object
attributes, and converts object arrays to `object[]` type with
attributes. This ensures complex MCP tool schemas survive the
`Parameter[]` -> Zod conversion without losing nested structure.
Split from #3838.
Core test (core-subscribe-to-agent.test.ts):
- Replace `as any` on RunErrorEvent with proper EventType.RUN_ERROR type
- Consolidate 4 identical lifecycle tests into one `it.each` block
- Extract silenceConsoleError() helper used across 10 error-path tests
- Document the remaining intentional `as any` in guardAll JS-consumer test
Angular test (agent.spec.ts):
- Make MockAgent extend AbstractAgent, removing all 4 `as unknown as AbstractAgent` double casts
- Replace all `any` types with proper AG-UI types (Message, State, AgentSubscriber, etc.)
- Emit helpers now pass correct AgentSubscriberParams instead of empty objects
- Use userMsg() factory for properly typed test data
- Simplify ProxiedCopilotRuntimeAgent assertion with single narrowing
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
React's useAgent was missing onRunErrorEvent under OnRunStatusChanged,
causing isRunning to stay true after protocol-level RUN_ERROR events
(infinite spinner). Angular already handled this via PR #3749.
Also updates SubscribeToAgentSubscriber JSDoc to accurately document
onRunErrorEvent as the sixth allowed callback with rationale for its
inclusion despite having stopPropagation in its return type, and adds
a core-level test for onRunErrorEvent firing immediately during
throttle windows.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Restore `let active` guard in useAgent subscription effect (removed
during refactor, causing ReferenceError in batchedForceUpdate)
- Add onRunErrorEvent to SubscribeToAgentSubscriber allowed keys
(added on main for Angular AgentStore)
- Fix throttle tests to use async act() for onStateChanged assertions
(batchedForceUpdate uses queueMicrotask, needs await to flush)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Replace the hand-rolled leading+trailing throttle (scheduleOrFlush,
setTimeout, throttleActive state machine) with TanStack Pacer's
Throttler class. Clean up comments to describe the method generically
rather than only in terms of throttling.
No public API changes — throttleMs / defaultThrottleMs stay as-is.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Address review feedback: replace Object.entries loop in guardAll
with explicit per-key wrapping so TypeScript can verify all
callback signatures without any casts. Also replace Promise
duck-typing in safeCall with instanceof Promise, and use
Record<string, unknown> instead of any in the unsupported keys check.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Move the unsupported-key scan from guardAll into a pre-scan that runs
before the throttled/unthrottled branch, so JS consumers passing
unsupported callbacks (e.g. onEvent via `as any`) get a console.warn
regardless of whether throttling is active. Previously, guardAll only
ran on lifecycleOnly in the throttled path, silently dropping
unsupported keys without any diagnostic.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Add Error state handling in Angular CopilotkitAgentFactory (parity with React)
- Add emitError to guardAll for dropped callbacks (structured monitoring)
- Add emitError to setDefaultThrottleMs for monitoring parity
- Replace empty .catch(() => {}) with logging pattern on emitError
- Add generic typing to safeCall for call-site parameter safety
- Clarify flushPending comment re: sync-only unsubscribe guard
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Add `satisfies readonly (keyof AgentSubscriber)[]` to SUBSCRIBE_TO_AGENT_KEYS
so upstream AG-UI renames are caught at compile time
- Fix SubscribeToAgentSubscriber JSDoc: separate AG-UI event handlers (mutation
semantics) from per-item callbacks (void return, excluded for surface area),
note that included lifecycle callbacks also return AgentStateMutation
- Emit invalid throttleMs through emitError so monitoring systems see
misconfiguration, not just console.error
- Add flushPending comment explaining the re-checked `active` flag between
onMessagesChanged and onStateChanged dispatch
- Derive SubscribeToAgentFn from CopilotKitCore['subscribeToAgent'] instead
of manually duplicating the signature (eliminates desync risk)
- Derive StubCore from Pick<CopilotKitCore, ...> in Angular tests
- Add test: async rejection during throttled trailing-edge flush
- Add test: clearing defaultThrottleMs(undefined) makes new subs unthrottled
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Add .catch() to emitError() in reportError to prevent unhandled
promise rejections if the error reporting infrastructure itself fails
- Add console.warn in guardAll when unsupported callback keys are
dropped, so JS consumers discover they need agent.subscribe() directly
- Hoist ALLOWED_KEYS Set to module scope to avoid per-call allocation
- Fix SubscribeToAgentSubscriber JSDoc: explicitly list the 5 supported
callbacks and mention onNewMessage/onNewToolCall as excluded
- DRY subscribeToAgent() method JSDoc by referencing the type instead
of duplicating the AG-UI exclusion rationale
- Fix safeCall comment: async error path returns Promise<undefined>,
not undefined
- Add JSDoc to setDefaultThrottleMs setter; simplify getter JSDoc
- Fix use-agent.tsx: consistent camelCase callback names, fix @default
tag format, replace unresolvable {@link} with plain text reference
- Add test: emitError/onError integration for SUBSCRIBER_CALLBACK_FAILED
- Add test: unsubscribe + throw combination in onMessagesChanged
- Add test: unsupported callback keys dropped with console.warn
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
AgentStore now receives a SubscribeToAgentFn function instead of a
CopilotKitCore instance. The factory binds core.subscribeToAgent once
and passes the bound function, keeping AgentStore decoupled from the
core class while preserving all throttle and error-protection behavior.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Add SUBSCRIBER_CALLBACK_FAILED error code and call emitError() in
safeCall so subscriber failures are visible to monitoring systems
and onError handlers, not just console.error
- Document that safeCall intentionally discards return values on the
error path (including lifecycle AgentStateMutation)
- Extract SUBSCRIBE_TO_AGENT_KEYS tuple as single source of truth for
both the SubscribeToAgentSubscriber type and the runtime ALLOWED_KEYS
set, eliminating the one-directional sync risk from the satisfies pattern
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Type `handlers` in use-agent.tsx as `SubscribeToAgentSubscriber` instead
of full `AgentSubscriber` to prevent silent runtime stripping of unsupported
callbacks
- Reframe AG-UI exclusion JSDoc: designed for observation, not event mutation
(stopPropagation semantics can't be safely mediated)
- Add `satisfies` constraint to ALLOWED_KEYS so it stays synchronized with
the SubscribeToAgentSubscriber Pick type at compile time
- Use `.then` instead of `.catch` for standard thenable detection in safeCall
- Include agent ID in all safeCall error messages for multi-agent debugging
- Only wrap lifecycle callbacks in guardAll for throttled path (messages/state
wrappers were immediately overwritten — wasted work)
- Fix "pending flags" → "pending params" in inline comment
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Replace `as any` cast in notifyLifecycle with type-safe branching,
type the re-entrant test callback params via SubscribeToAgentSubscriber,
and replace `Record<string, any>` on Angular stub's core with a
typed StubCore interface.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Add ALLOWED_KEYS filter in guardAll to prevent runtime leakage of
extra properties from JS consumers or `as any` casts
- Check `active` flag between flushPending dispatches so unsubscribing
inside onMessagesChanged prevents onStateChanged from firing
- Use real CopilotKitCore instance in Angular test stub instead of
passthrough that bypasses throttle and safeCall logic
- Reword SubscribeToAgentSubscriber and subscribeToAgent JSDoc to
accurately explain why AG-UI event handlers are excluded (mutation
return values silently discarded) rather than implying a clean
return-type split
- Add leading+trailing pattern summary to useAgent throttleMs JSDoc
- Fix setDefaultThrottleMs JSDoc: "logged as errors and ignored"
instead of ambiguous "rejected by the setter"
- Add tests: re-entrant notifications during flush, multiple
simultaneous subscriptions with independent throttle windows,
unsubscribe isolation, unsubscribe-during-flush prevents sibling
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Introduce SubscribeToAgentSubscriber, a Pick of AgentSubscriber limited
to the five notification/lifecycle callbacks (onMessagesChanged,
onStateChanged, onRunInitialized, onRunFinalized, onRunFailed). Event
handlers that return AgentStateMutation (e.g. onEvent,
onToolCallStartEvent) should use agent.subscribe() directly so their
mutation and stopPropagation semantics are preserved — safeCall's
error-swallowing would silently discard those return values.
This is a compile-time constraint only; no runtime behavior changes.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Address code review findings for subscribeToAgent:
- Wrap ALL subscriber callbacks (not just onMessagesChanged/onStateChanged)
with safeCall error protection so a throwing lifecycle or event callback
cannot corrupt the agent's notification loop
- safeCall now returns the result on the success path, preserving
AgentStateMutation return values from subscriber callbacks
- Extract SubscribeToAgentOptions named interface for extensibility
- Remove redundant pendingMessages/pendingState boolean flags — use
latestMessagesParams/latestStateParams !== null instead
- Add guardAll helper used by both throttled and unthrottled paths
- Fix JSDoc: reference public defaultThrottleMs (not private field),
document shared throttle window, use callback names instead of enum
- Add 5 new core-level tests: trailing-edge re-arm, onRunFailed
passthrough, async rejection handling, unthrottled exception safety,
unthrottled lifecycle exception safety
- Extract RUN_INPUT constant and notifyLifecycle helper, reducing test
helper duplication
- Remove ephemeral review-reference from test section header
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Extract safeCall helper that catches synchronous throws and attaches
.catch() for async (MaybePromise<void>) rejections, preventing
unhandled promise rejections from crashing Node.js (SSR) or producing
cryptic browser errors
- Wrap onMessagesChanged/onStateChanged in the unthrottled path with the
same error protection, so a throwing subscriber cannot corrupt the
agent's notification loop regardless of whether throttling is active
- Simplify flushPending by delegating to safeCall
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Address review findings from PR #3734:
- Wrap flushPending callback invocations in try-catch so a thrown
exception in onMessagesChanged/onStateChanged does not permanently
deadlock the throttle state machine or skip the sibling flush
- Add 21 dedicated unit tests for CopilotKitCore.subscribeToAgent
covering leading/trailing edge, shared window (bidirectional),
burst coalescing, run lifecycle passthrough, unsubscribe cleanup,
resolution cascade, invalid values, and exception safety
- Use named CopilotKitCoreSubscription return type
- Fix Angular test stub to accept the options parameter and document
that it bypasses throttle logic
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Moves the leading+trailing throttle algorithm from the React-specific
useAgent hook into a framework-agnostic subscribeToAgent method on
CopilotKitCore. This consolidates throttle cascade resolution
(throttleMs ?? defaultThrottleMs ?? 0), validation, and the throttle
algorithm into a single location.
Key changes:
- Add subscribeToAgent() to CopilotKitCore with shared throttle gate
for onMessagesChanged and onStateChanged (run lifecycle events are
never throttled)
- Fix setDefaultThrottleMs to log errors and preserve previous value
on invalid input instead of silently erasing
- Simplify useAgent by removing ~60 lines of inline throttle logic
- Angular AgentStore now uses subscribeToAgent, getting throttle
support via provider-level defaultThrottleMs for free
- Remove duplicate validation from CopilotKitProvider useEffect
- Add direct unit tests for CopilotKitCore.setDefaultThrottleMs
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
copilotkit.headers is already captured by headersKey (a stable memoized
string). Keeping the raw headers object in the dep array causes the context
effect to re-run on every render because mock (and real) copilotkit objects
return new header object references, leading to an unhandled
"threads is not iterable" error in tests when the spurious re-run consumed
the wrong fetchMock slot.
Also adds getThreadStore (singular) to MockCore in web-inspector.spec.ts so
ensureOwnedThreadStore can call core.getThreadStore() without throwing.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
The docs table and prose claimed `debug: true` sets `verbose: true`,
but the implementation intentionally defaults verbose to false (PII
safety). Fixed the table and explanatory text to match.
Also removed packages/vscode-extension/README.md which was committed
on this branch by mistake — it describes an unrelated VS Code extension
and has nothing to do with debug mode.
Alem Tuzlak