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think: write assistant-message metadata via forwarded messageMetadata (#1873) - #2321

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think-assistant-message-metadata
Sep 23, 2026
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think: write assistant-message metadata via forwarded messageMetadata (#1873)#2321
threepointone merged 2 commits into
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think-assistant-message-metadata

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@threepointone

@threepointone threepointone commented Sep 23, 2026 •
edited by devin-ai-integration Bot
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Fixes #1873.

Problem

Think wraps the AI SDK streamText result and calls result.toUIMessageStream({ sendReasoning, onError }) itself. That drops the AI SDK messageMetadata callback, which base AIChatAgent + streamText already support. So on Think, a turn can stamp metadata on user messages (the client sends it and Think keeps it), but there is no supported way to write metadata onto the assistant message Think persists. The motivating case is a per-message createdAt timestamp in the chat UI.

Fix

The downstream plumbing already worked. The shared StreamAccumulator (agents/chat) merges messageMetadata from start, finish and message-metadata chunks into the persisted message, and the AI SDK client applies them live. The only missing piece was passing the callback into toUIMessageStream.

  • New instance property Think#messageMetadata for metadata that applies to every turn.
  • New TurnConfig.messageMetadata returned from beforeTurn for per-turn metadata. It is resolved as config.messageMetadata ?? this.messageMetadata, the same pattern as sendReasoning.
  • New exported type MessageMetadataCallback<Metadata = Record<string, unknown>>. It matches the AI SDK signature ({ part }) => metadata | undefined. The defaulted generic leaves room for the typed-metadata work in First-class events, render-only messages, and typed metadata in Think #1676 without a breaking change.
  • The resolved callback is forwarded inside Think's streamText wrapper, so it applies to both the WebSocket chat path (_streamResult) and the sub-agent chat() RPC path (_streamResultToRpcCallback).

Behavior worth knowing

  • The AI SDK calls the callback for every stream part. Results for start/finish ride on those chunks; results for other parts are sent as message-metadata chunks. Every non-undefined return is shallow-merged into the message's metadata.
  • An auto-continuation (after a tool approval or client tool result) is its own turn in Think. beforeTurn runs again with ctx.continuation: true, and the continuation persists as a separate assistant message with its own metadata. The test below locks this in.
  • Sandboxed extensions can't return functions over RPC. _pipelineExtensionBeforeTurn only merges an allow-list of serializable fields, so an extension can't set this field, and a messageMetadata set by the subclass is kept.

Credit

The first commit is @abhagsain's branch from the issue thread (compare), cherry-picked with authorship kept. It builds on the minimal patch @O4epegb posted. The second commit tightens it:

  • Removed messageMetadata from the public StreamableResult.toUIMessageStream options. Nothing in Think passes it, so the "caller option wins" branch was dead code, and it widened a public interface that custom onChatMessage implementations satisfy.
  • Added tests for the live broadcast chunks, the chat() RPC path, and the continuation behavior. The original tests only checked persistence over WebSocket.
  • Corrected docs. They now say the callback runs for every part, not just start/finish. I dropped the claim that a start stamp "survives a turn that stalls or errors", which no test covers, and documented the continuation behavior.

Tests

packages/think/src/tests/assistant-message-metadata.test.ts (7 tests):

  • Per-turn writer: start + finish metadata are merged onto the persisted assistant message.
  • Live start/finish chunks broadcast to the WebSocket client carry messageMetadata.
  • Auto-continuation: the writer is resolved again (ctx.continuation), and each assistant message has its own metadata.
  • Sub-agent chat() RPC path: the streamed start chunk and the persisted message both carry the metadata.
  • Instance-level writer applies when there's no per-turn override.
  • A per-turn writer overrides the instance writer.
  • No writer configured: no metadata is added.

With the forwarding line removed, 5 of the 6 tests that expect metadata fail; the opt-in test passes either way, as it should. The full Think workers suite passes (943 tests), and pnpm run check is clean.

Out of scope

Request 2 in the issue, exposing cf_ai_chat_agent_messages.created_at on messages sent to the client for historical messages, is left out. It changes the message shape for every client, and it's cleaner as its own decision, alongside #1676's typed-metadata story.

Devin Review

abhagsain and others added 2 commits September 23, 2026 12:55
@abhagsain @claude @threepointone
feat(think): write assistant-message metadata via forwarded messageMe…
a2b0586 
…tadata (#1873)

Think wrapped the AI SDK stream and forwarded only { sendReasoning, onError }
through toUIMessageStream, dropping the messageMetadata callback that base
AIChatAgent + streamText accept. A turn could stamp metadata on user messages
but not on the assistant message Think persists.

Add an instance-level `messageMetadata` property and a per-turn
`TurnConfig.messageMetadata` override, resolved as `config.messageMetadata ??
this.messageMetadata` and forwarded through the wrapped toUIMessageStream. The
new `MessageMetadataCallback<Metadata = Record<string, unknown>>` type carries a
defaulted generic so the typed-metadata story in #1676 can narrow the return
type without a breaking change.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
@threepointone @cursoragent
think: tighten messageMetadata forwarding, add broadcast/RPC/continua…
3472376 
…tion tests

- Keep messageMetadata off the public StreamableResult options; the wrapper
  forwards the resolved per-turn/instance writer directly.
- Test the live start/finish chunks, the sub-agent chat() RPC path, and that
  an auto-continuation resolves the writer again and persists its own
  assistant message.
- Correct docs: the callback runs for every part; drop the unverified
  stall/error survival claim; document continuation behavior.

Co-authored-by: Cursor <cursoragent@cursor.com>
@changeset-bot

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🦋 Changeset detected

Latest commit: 3472376

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages
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@cloudflare/think Minor
@cloudflare/agent-think Patch

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@agent-think

agent-think Bot commented Sep 23, 2026

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⚪ agents import sizes

Measured 343 runtime imports as minified bundles. The primary size is gzip; raw minified size is included for diagnosis. An existing import growing by more than 10% is marked red. This report is informational.

Red Yellow Green Unchanged New Removed
0 0 0 343 0 0

Compared c076e4c9 with 3472376c. Open workflow run.

No import sizes changed.

All 343 current runtime imports
Status Import Gzip Raw minified
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⚪ agents/chat#resolveToolMergeId 2.4 KiB 8.5 KiB
⚪ agents/chat#ResumableStream 5.1 KiB 16.8 KiB
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⚪ agents/chat#ROW_MAX_BYTES 2.3 KiB 8.2 KiB
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⚪ agents/chat#shouldCreditStreamProgress 2.4 KiB 8.3 KiB
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⚪ agents/sessions#Sessions 9.6 KiB 34.3 KiB
⚪ agents/skills#fromManifest 309.8 KiB 1084.0 KiB
⚪ agents/skills#parseSkillFrontmatter 328.4 KiB 1146.2 KiB
⚪ agents/skills#parseSkillMarkdown 328.6 KiB 1146.5 KiB
⚪ agents/skills#r2 330.2 KiB 1150.4 KiB
⚪ agents/skills#runner 369.0 KiB 1297.8 KiB
⚪ agents/skills#SkillRegistry 416.4 KiB 1581.7 KiB
⚪ agents/skills/compile#compileSkillScript 15.4 KiB 43.4 KiB
⚪ agents/skills/compile#isCompilableSkillScript 15.4 KiB 43.3 KiB
⚪ agents/state#State 1.1 KiB 2.4 KiB
⚪ agents/streams#DEFAULT_MAX_CHUNK_BYTES 94 B 96 B
⚪ agents/streams#sseResponse 857 B 1.6 KiB
⚪ agents/streams#StreamClosedError 175 B 212 B
⚪ agents/streams#StreamNotFoundError 215 B 276 B
⚪ agents/streams#Streams 4.3 KiB 13.9 KiB
⚪ agents/streams#StreamSerializationError 171 B 201 B
⚪ agents/tasks#DuplicateTaskStepError 328 B 463 B
⚪ agents/tasks#MAX_SERIALIZED_BYTES 190 B 232 B
⚪ agents/tasks#MissingTaskDefinitionError 358 B 536 B
⚪ agents/tasks#NonRetryableError 238 B 308 B
⚪ agents/tasks#TaskReplayDivergedError 341 B 483 B
⚪ agents/tasks#Tasks 8.9 KiB 31.8 KiB
⚪ agents/tasks#TaskSerializationError 258 B 339 B
⚪ agents/types#MessageType 211 B 365 B
⚪ agents/vite#default 353.8 KiB 1356.1 KiB
⚪ agents/voice#addSFUTracks 324 B 424 B
⚪ agents/voice#createSFUSession 255 B 306 B
⚪ agents/voice#createSFUWebSocketAdapter 331 B 429 B
⚪ agents/voice#decodeVarint 157 B 160 B
⚪ agents/voice#downsample48kStereoTo16kMono 238 B 324 B
⚪ agents/voice#encodePayloadToProtobuf 189 B 279 B
⚪ agents/voice#encodeVarint 129 B 122 B
⚪ agents/voice#extractPayloadFromProtobuf 271 B 425 B
⚪ agents/voice#iterateText 1.6 KiB 3.8 KiB
⚪ agents/voice#renegotiateSFUSession 329 B 428 B
⚪ agents/voice#SentenceChunker 550 B 1.1 KiB
⚪ agents/voice#sfuFetch 294 B 358 B
⚪ agents/voice#upsample16kMonoTo48kStereo 211 B 272 B
⚪ agents/voice#VOICE_PROTOCOL_VERSION 51 B 31 B
⚪ agents/voice#withVoice 9.5 KiB 32.7 KiB
⚪ agents/voice#withVoiceInput 4.8 KiB 16.0 KiB
⚪ agents/voice#WorkersAIFluxSTT 1.5 KiB 4.3 KiB
⚪ agents/voice#WorkersAINova3STT 1.6 KiB 4.3 KiB
⚪ agents/voice#WorkersAITTS 682 B 1.4 KiB
⚪ agents/voice/client#VOICE_PROTOCOL_VERSION 473 B 768 B
⚪ agents/voice/client#VoiceClient 10.1 KiB 31.6 KiB
⚪ agents/voice/client#WebSocketVoiceTransport 4.6 KiB 13.3 KiB
⚪ agents/voice/errors#logVoiceError 132 B 173 B
⚪ agents/voice/errors#toVoiceError 94 B 80 B
⚪ agents/voice/errors#voiceErrorMessage 125 B 111 B
⚪ agents/voice/errors#VoiceProviderError 190 B 345 B
⚪ agents/voice/react#useVoiceAgent 13.6 KiB 42.5 KiB
⚪ agents/voice/react#useVoiceInput 13.3 KiB 41.4 KiB
⚪ agents/voice/react#WebSocketVoiceTransport 7.4 KiB 21.3 KiB
⚪ agents/voice/sfu#addSFUTracks 323 B 424 B
⚪ agents/voice/sfu#createSFUSession 254 B 306 B
⚪ agents/voice/sfu#createSFUWebSocketAdapter 329 B 429 B
⚪ agents/voice/sfu#decodeVarint 155 B 160 B
⚪ agents/voice/sfu#downsample48kStereoTo16kMono 236 B 324 B
⚪ agents/voice/sfu#encodePayloadToProtobuf 188 B 279 B
⚪ agents/voice/sfu#encodeVarint 129 B 122 B
⚪ agents/voice/sfu#extractPayloadFromProtobuf 270 B 425 B
⚪ agents/voice/sfu#renegotiateSFUSession 329 B 428 B
⚪ agents/voice/sfu#sfuFetch 292 B 358 B
⚪ agents/voice/sfu#upsample16kMonoTo48kStereo 209 B 272 B
⚪ agents/voice/text#iterateText 1.6 KiB 3.8 KiB
⚪ agents/voice/text#SentenceChunker 549 B 1.1 KiB
⚪ agents/voice/types#VOICE_PROTOCOL_VERSION 51 B 31 B
⚪ agents/voice/workers-ai#WorkersAIFluxSTT 1.5 KiB 4.3 KiB
⚪ agents/voice/workers-ai#WorkersAINova3STT 1.6 KiB 4.3 KiB
⚪ agents/voice/workers-ai#WorkersAITTS 682 B 1.4 KiB
⚪ agents/websockets#CAPNWEB_TRANSPORT_QUERY 12.4 KiB 43.3 KiB
⚪ agents/websockets#CAPNWEB_TRANSPORT_VALUE 12.4 KiB 43.3 KiB
⚪ agents/websockets#capnWebTransportUrl 12.5 KiB 43.5 KiB
⚪ agents/websockets#CF_NO_PROTOCOL_KEY 12.4 KiB 43.3 KiB
⚪ agents/websockets#CF_READONLY_KEY 12.4 KiB 43.3 KiB
⚪ agents/websockets#isCapnWebTransportUpgrade 12.5 KiB 43.4 KiB
⚪ agents/websockets#registerInternalConnectionKeys 12.4 KiB 43.4 KiB
⚪ agents/websockets#WebSockets 20.0 KiB 69.3 KiB
⚪ agents/workflows#AgentWorkflow 262.4 KiB 1145.7 KiB
⚪ agents/workflows#WorkflowRejectedError 261.2 KiB 1141.2 KiB
⚪ agents/x402#normalizeNetwork 14.7 KiB 61.1 KiB
⚪ agents/x402#withX402 23.0 KiB 89.2 KiB
⚪ agents/x402#withX402Client 104.1 KiB 346.5 KiB

Reported by agent-think[bot].

devin-ai-integration[bot]
devin-ai-integration Bot reviewed Sep 23, 2026
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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

Devin Review

@pkg-pr-new

pkg-pr-new Bot commented Sep 23, 2026

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agents

npm i https://pkg.pr.new/agents@2321

@cloudflare/ai-chat

npm i https://pkg.pr.new/@cloudflare/ai-chat@2321

@cloudflare/codemode

npm i https://pkg.pr.new/@cloudflare/codemode@2321

hono-agents

npm i https://pkg.pr.new/hono-agents@2321

@cloudflare/shell

npm i https://pkg.pr.new/@cloudflare/shell@2321

@cloudflare/think

npm i https://pkg.pr.new/@cloudflare/think@2321

@cloudflare/voice

npm i https://pkg.pr.new/@cloudflare/voice@2321

@cloudflare/worker-bundler

npm i https://pkg.pr.new/@cloudflare/worker-bundler@2321

commit: 3472376

@threepointone
threepointone merged commit 7d58ade into main Sep 23, 2026
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@threepointone
threepointone deleted the think-assistant-message-metadata branch September 23, 2026 14:46
@github-actions github-actions Bot mentioned this pull request Sep 23, 2026
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Think: no server-side path to write assistant-message metadata (messageMetadata dropped through toUIMessageStream)

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@threepointone @abhagsain