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Created
Mar 17, 2026
Updated
May 21, 2026
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assistant-stream#

0.3.15#

Patch Changes#

0.3.14#

Patch Changes#

  • #3979 9ecda1d - feat(assistant-stream): add resumable stream primitives (@okisdev)

    new assistant-stream/resumable entrypoint for persisting an in-flight AssistantStream and replaying it after a disconnect or reload.

    createResumableStreamContext({ store, ttlMs?, waitUntil?, onAcquire?, onAppend?, onFinalize?, onError? }) returns { run, resume, requireResume, status, delete }.

    createResumableAssistantStreamResponse and createResumeAssistantStreamResponse bridge AssistantStreamController callbacks to any AssistantStreamEncoder.

    createInMemoryResumableStreamStore covers dev and tests; Redis adapters live at assistant-stream/resumable/redis and assistant-stream/resumable/ioredis (peer deps), with pipelined appends and binary chunk values.

    typed errors via ResumableStreamError with codes "missing" | "exists" | "finalized" | "invalid-id".

  • #4008 fa4510a - feat: support multi-modal tool results via toModelOutput (@okisdev)

    frontend tools can now project their execution output into multi-modal model content (text + image / pdf / arbitrary file parts), aligning with the AI SDK v6 toModelOutput callback. previously, tool results were always serialized as a single JSON value, so a "read pdf" style tool had no way to send the PDF back to a multi-modal model.

    • assistant-stream exports a new ToolModelContentPart type ({ type: "text", text } | { type: "file", data, mediaType, filename? }) and a ToolModelOutputFunction<TArgs, TResult> callback type. Tool.toModelOutput is wired through unstable_runPendingTools and ToolExecutionStream, attaching the resulting modelContent to the tool-call part on the assistant message.
    • @assistant-ui/core re-exports ToolModelContentPart and adds an optional modelContent?: readonly ToolModelContentPart[] field on ToolCallMessagePart. existing tools and renderers are unchanged.
    • @assistant-ui/react-ai-sdk's frontendTools(...) helper now also registers a toModelOutput on each forwarded tool. it transparently unwraps an envelope that useAISDKRuntime writes when a frontend-executed tool produced modelContent, turning it into AI SDK's { type: "content", value: [...] } output. plain (non-envelope) outputs fall back to the existing { type: "text" | "json", value } shape, so behavior for tools without toModelOutput is unchanged.

    route handlers that adopt toModelOutput also need to pass tools to convertToModelMessages (this is the AI SDK's documented pattern):

    const aiSDKTools = { ...frontendTools(tools ?? {}) };
streamText({
  messages: await convertToModelMessages(messages, { tools: aiSDKTools }),
  tools: aiSDKTools,
});

    templates and existing examples are unchanged. they keep the simpler convertToModelMessages(messages) form because none of the tools they ship with use toModelOutput. the new tools guide page documents how to opt in.

    reserved key. when a frontend tool defines toModelOutput, its result is persisted in the AI SDK chat as { __aui_modelContent: ToolModelContentPart[], value: <your result> }. tools must not return objects whose top-level key is literally __aui_modelContent, or convertMessage will misread the result. the prefix is namespaced for this reason.

    read/write compatibility for persisted threads. the envelope is recognized by @assistant-ui/react-ai-sdk from this version onward. if you persist UI messages and read them from multiple environments, upgrade every reader before any writer starts producing toModelOutput; otherwise older readers will treat the envelope object as the result and break the affected tool render functions.

0.3.13#

Patch Changes#

0.3.12#

Patch Changes#

0.3.11#

Patch Changes#

  • c988db8: chore: update dependencies

0.3.10#

Patch Changes#

  • 2c5cd97: fix(assistant-stream): handle CRLF line endings in LineDecoderStream

0.3.9#

Patch Changes#

  • dffb6b4: feat: add data part type to streaming pipeline

    Add DataPart as a new streamable content part type, enabling AI to send structured named data that renders via makeAssistantDataUI. Includes appendData() controller method and DataStream serialization support.

  • 9103282: fix: resolve biome lint warnings (optional chaining, unused suppressions)

  • bdce66f: chore: update dependencies

  • 209ae81: chore: remove aui-source export condition from package.json exports

0.3.8#

Patch Changes#

  • 3227e71: feat: add toPartialJSONSchema utility for making JSON Schema properties optional
  • 52403c3: chore: update dependencies

0.3.7#

Patch Changes#

  • 736344c: chore: update dependencies

0.3.6#

Patch Changes#

  • 427ffaa: refactor: drop all barrel files
  • 349f3c7: chore: update deps
  • 02614aa: feat: add multi-agent support
    • ReadonlyThreadProvider and MessagePartPrimitive.Messages for rendering sub-agent messages
    • assistant-stream: add messages field to tool-result chunks, ToolResponseLike, and ToolCallPart types, enabling sub-agent messages to flow through the streaming protocol

0.3.5#

Patch Changes#

  • 2828b67: fix(assistant-stream): throw a clear error when a Standard Schema (e.g. Zod v3) cannot be converted to JSON Schema, instead of silently passing through invalid data. Also add support for ~standard.jsonSchema.input() conversion path.

0.3.4#

Patch Changes#

  • 36ef3a2: chore: update dependencies

0.3.3#

Patch Changes#

  • 61b54e9: Add message timing metadata: AssistantMessageTiming type, automatic timing tracking in AssistantMessageAccumulator, MessageTiming type, useMessageTiming() hook, and client-side streaming timing for AI SDK runtime.
  • 93910bd: Rename .tsx files to .ts where no JSX syntax is used

0.3.2#

Patch Changes#

  • a088518: chore: update dependencies

0.3.1#

Patch Changes#

  • d45b893: chore: update dependencies

0.3.0#

Minor Changes#

  • acbaf07: feat: add framework-agnostic toToolsJSONSchema and toGenericMessages utilities to assistant-stream

0.2.48#

Patch Changes#

  • 605d825: chore: update dependencies

0.2.47#

Patch Changes#

  • 3719567: chore: update deps

0.2.46#

Patch Changes#

  • 57bd207: chore: update dependencies
  • cce009d: chore: use tsc for building packages

0.2.45#

Patch Changes#

  • e8ea57b: chore: update deps

0.2.44#

Patch Changes#

  • 89aec17: feat: AI SDK frontend tool execution cancellation support
    fix: AI SDK isRunning status when running frontend tools

0.2.43#

Patch Changes#

  • 01c31fe: chore: update dependencies

0.2.42#

Patch Changes#

  • ec662cd: chore: update dependencies

0.2.41#

Patch Changes#

  • 2c33091: chore: update deps

0.2.40#

Patch Changes#

  • ef58020: feat(assistant-stream): parallel tool calling

0.2.39#

Patch Changes#

  • 2fc7e99: chore: update deps

0.2.38#

Patch Changes#

  • 2fc5c3d: feat: AssistantTransport wire format

0.2.37#

Patch Changes#

  • 953db24: chore: update deps

0.2.36#

Patch Changes#

  • chore: update deps

0.2.35#

Patch Changes#

  • 7c5943b: fix: detect duplicate tool calls in data stream

0.2.34#

Patch Changes#

  • e6a46e4: chore: update deps

0.2.33#

Patch Changes#

  • 3caad00: refactor: rename interrupt -> human for tool input handling

0.2.32#

Patch Changes#

  • e81784b: feat: Tool Call interrupt() resume() API

0.2.31#

Patch Changes#

  • c0f5003: fix(stream): always use async to flush controller appends

0.2.30#

Patch Changes#

  • 8812f86: chore: update deps

0.2.29#

Patch Changes#

  • d19ebab: feat(assistant-transport): surface stream errors to caller

0.2.28#

Patch Changes#

  • feat: throttle only on stream resume

0.2.27#

Patch Changes#

  • fix: make accumulator throttling smoother

0.2.26#

Patch Changes#

  • 0f21c70: feat: throttle AssistantMessageAccumulator emits

0.2.25#

Patch Changes#

  • 2e7a10f: feat: createInitialMessage unstable_state support
    feat: export AssistantMetaTransformStream

0.2.24#

Patch Changes#

  • cf26771: feat: export AssistantTransformStream API

0.2.23#

Patch Changes#

  • 12e0a77: chore: update deps

0.2.22#

Patch Changes#

  • 0f063e0: chore: update dependencies

0.2.21#

Patch Changes#

  • fix: race condition in RunController when using parentIds

0.2.20#

Patch Changes#

  • f23fdb6: feat: add parent ID grouping for message parts

0.2.19#

Patch Changes#

  • 20a4649: fix: preserve message error statuses, avoid being overwritten by finish chunks
  • 9793e64: fix: if tool calls have no argsText, assume empty object instead of crashing

0.2.18#

Patch Changes#

  • 65b3ff1: chore: update deps

0.2.17#

Patch Changes#

  • 644abb8: chore: update deps

0.2.16#

Patch Changes#

  • de00319: fix: add assistant-stream/utils subpath import workaround

0.2.15#

Patch Changes#

  • 51b8493: feat: add missing exports

0.2.14#

Patch Changes#

  • 52e18bc: feat: ToolResponseLike

0.2.13#

Patch Changes#

  • fix: Last is not a partial call attempt 3

0.2.12#

Patch Changes#

  • fix: add another workaround for Last is not a partial call

0.2.11#

Patch Changes#

  • fix: Last is not a partial call error

0.2.10#

Patch Changes#

  • chore: update deps

0.2.9#

Patch Changes#

  • fix: PlainTextEncoder should ignore part-start/finish

0.2.8#

Patch Changes#

  • fix: close argsTextController when setResponse is called

0.2.7#

Patch Changes#

  • 5cb9598: feat(assistant-stream): ObjectStream

0.2.6#

Patch Changes#

  • 0809c9f: feat: add missing exports from 'assistant-stream'

0.2.5#

Patch Changes#

  • c4c60cf: fix: server-side tool results should be forwarded to StreamCallController
  • 73a6ff1: feat: Tool.type

0.2.4#

Patch Changes#

  • 98a680e: chore: update deps

0.2.3#

Patch Changes#

  • 30ae924: fix: disabled tools should still execute if invoked

0.2.2#

Patch Changes#

  • fix: ESM without bundler compat

0.2.1#

Patch Changes#

  • fix: correctly include Typescript declarations

0.2.0#

Patch Changes#

  • 557c3f7: build: drop CJS builds

0.1.8#

Patch Changes#

  • fix: types in ESM

0.1.7#

Patch Changes#

  • 51104f0: feat: ship declarationMaps

0.1.6#

Patch Changes#

  • feat: export AssistantStreamController

0.1.5#

Patch Changes#

  • 2e4a7c1: fix: correctly forward tool result from data stream

0.1.4#

Patch Changes#

  • 62c2af7: feat: tool.streamCall API
  • b9c731a: chore: update dependencies

0.1.3#

Patch Changes#

  • c0c9422: feat: useToolArgsFieldStatus

0.1.2#

Patch Changes#

  • chore: update deps

0.1.1#

Patch Changes#

  • fix: throw error when LineDecoderStream ends with incomplete line instead of emitting it

0.1.0#

Patch Changes#

  • 1f65c94: fix: ToolResponse instanceof check via named symbol
  • 8df35f6: feat: fix duplicate tool calls appearing from ai-sdk
  • 476cbfb: fix: make text-delta support reasoning part type

0.0.32#

Patch Changes#

  • 545a17c: fix: do not crash on tool call with empty argsText

0.0.31#

Patch Changes#

  • 93c3eb4: fix: drop ToolResponseBrand

0.0.30#

Patch Changes#

  • a22bc7a: refactor: merge setResult and setArtifact to setResponse
  • 39aecd7: chore: update dependencies

0.0.29#

Patch Changes#

  • feat: expose assitant-stream ToolResponse API

0.0.28#

Patch Changes#

  • 40579cd: feat: ToolResponse support

0.0.27#

Patch Changes#

  • fix: assistant-stream appendText must only append to the very last part

0.0.26#

Patch Changes#

  • c4d7b29: feat: tool call artifacts

0.0.25#

Patch Changes#

  • fix: frontend tool call enqueue bug

0.0.24#

Patch Changes#

  • chore: bump assistant-stream

0.0.23#

Patch Changes#

  • 439ae67: fix: properly emit tool-call args-text finish

0.0.22#

Patch Changes#

  • b07603d: feat: assistant-stream rewrite

0.0.21#

Patch Changes#

  • fix: pin nanoid version for CJS compat

0.0.20#

Patch Changes#

  • 7f7ab5e: refactor: assitant-stream API

0.0.19#

Patch Changes#

  • 72e66db: chore: update dependencies

0.0.18#

Patch Changes#

  • b44a7ad: feat: error message part
  • 22272e6: chore: update dependencies

0.0.17#

Patch Changes#

  • 70ccbe6: feat: AssistantMessageStream

0.0.16#

Patch Changes#

  • 345f3d5: chore: update dependencies

0.0.15#

Patch Changes#

  • 4c2bf58: chore: update dependencies

0.0.14#

Patch Changes#

  • 982a6a2: chore: update dependencies

0.0.13#

Patch Changes#

  • ec3b8cc: chore: update dependencies

0.0.12#

Patch Changes#

  • ignore unsupported data stream parts

0.0.11#

Patch Changes#

  • 4c54273: chore: update dependencies

0.0.10#

Patch Changes#

  • interop with module resolution node

0.0.8#

Patch Changes#

  • 2112ce8: chore: update dependencies

0.0.7#

Patch Changes#

  • 933b8c0: chore: update deps

0.0.6#

Patch Changes#

  • c59d8b5: chore: update dependencies

0.0.5#

Patch Changes#

  • 1ada091: chore: update deps

0.0.4#

Patch Changes#

  • ff5b86c: chore: update deps

0.0.3#

Patch Changes#

  • d2375cd: build: disable bundling in UI package releases

0.0.1#

Patch Changes#

  • fb32e61: chore: update deps

0.0.0#

Patch Changes#

  • fb46305: chore: update dependencies