feat(agent): emit native run event types instead of AG-UI Custom wrappers - #4467
Conversation
The seven extension events this runtime wraps in AG-UI Custom frames now have one place that owns their wire name, stored type, legacy custom name, and the two emission shapes built from a single payload. No caller uses it yet. Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
TOOL_CALL_STATUS_CHANGED needs a tool name, and neither the telemetry frame nor the data-tool-call-status chunk carried one. Both now take it from the tool the reducer or the status tracker already has open. Two telemetry fixtures outside the primary change set (lifecycle-run-event-adapter.test.ts, executor-data-producers.test.ts) are updated to satisfy the now-required field. Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
Citations, attachments, tool status, input request lifecycle, and child run lifecycle now leave the live encoder under their own wire names. State chunks and unknown data names keep the Custom wrapper, and ToolCallStart names its turn. Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
The durable encoder and the durable lifecycle adapter now build their records from the same builders the live path uses, and the run event type table derives its new members from the native list. TOOL_CALL_START names its turn here too, because these are the rows the API derives tool spans from. Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
The child run producer appends a native record instead of a CUSTOM twin, and the paired STATE_DELTA is unchanged. The exported symbols keep their names so veryfront/agent stays compatible; each carries a Phase F marker naming the rename to make at the cutover. Also updates a downstream test (durable-child-fork-execution.test.ts) that matched on the removed CUSTOM shape, adds an end-to-end test driving buildInputRequestLifecycleDataEvent through both encoders, and adds a durable- path case proving the child-run record for run-events.ts routing. Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
The SSE parser resolves the native wire names from the same list the encoders emit them from, and the eval harness keys tool status on TOOL_CALL_STATUS_CHANGED and reads the payload directly, while still recognizing the legacy CUSTOM/tool-call-status fallback the encoder still produces for a status update with no toolCallId. By controller ruling after Task 4's codex review, the version 1 and version 2 legacy run read adapters now decode the seven native stored types back as the same custom lifecycle event their CUSTOM twins produced, so every downstream consumer of that adapter keeps seeing one shape. Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
… custom events DURABLE_ENVELOPE_KEYS stripped the version-2 protocol envelope fields and type, but missed elapsedMs/emittedAt, which ConversationRunEventEncoder's stampElapsed() stamps onto every durable event's own top level -- including the native records it builds for TOOL_CALL_STATUS_CHANGED/URL_CITED/ DOCUMENT_CITED/FILE_ATTACHED. A true CUSTOM record never leaked these because its value is nested, but readNativeAsLegacyCustom spreads the whole flat event, so they leaked into the rebuilt CUSTOM twin's value in production. Added elapsedMs/emittedAt to the strip list, with a version 1 regression test that stamps them onto a native record (mirroring stampElapsed's real output) and asserts they don't survive into the rebuilt value. The test deliberately uses URL_CITED rather than TOOL_CALL_STATUS_CHANGED: the version 1 reducer special-cases a custom signal named "tool-call-status", so a "completed" status produces no semantic custom frame on either path and the comparison would be a vacuous `[] === []`, unable to catch this class of leak. Also annotated (not derived) NATIVE_CITATION_AND_FILE_STORED_TYPES: the citation/file trio is a domain fact about three specific builders that NativeRunEventDefinition doesn't record, so deriving it from NATIVE_RUN_EVENTS would need a new field on that module rather than removing real duplication. Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
The decoder dropped any frame whose event name it did not know, which would have silently lost tool status, citations, attachments, input requests, and child run progress the moment the runtime stopped wrapping them in Custom. Each native name now maps back to the chunk its custom twin produced. Citation and attachment metadata (title/filename/url) is validated the way the twin rendered it: the encoder never type-checks these before sending them, so an empty string, a null, or even a wrong-typed value must not reject the whole frame, only fall back gracefully like toRenderableCustomChunk did. Reconstructed legacy data chunks also strip the live encoder's elapsedMs/emittedAt timing stamps, which land on a native frame's flat payload but never inside a Custom frame's nested value, and restore the chunk's own type discriminator that the wire format omits so unrenderable citations and attachments produce byte-identical fallback data to the twin. Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
… names Fix round 1 for the Task 7 review (task-7-review.md): - Move the seven native-frame tests out of the "without a registered SchemaValidator" describe block and into the schema-validated one they were actually exercising, and add a dedicated schemaless-path test so the seven new isValidAgUiPayload arms have real coverage on the path the browser chat client uses before a schema adapter is registered. - Pin AG_UI_WIRE_EVENT_NAMES against NATIVE_RUN_EVENTS with a test-only import (the test file is outside the client bundle graph), so an eighth native wire type added to the producer fails a test here instead of being silently dropped by the decoder. - Export AG_UI_EVENT_TIMING_STAMP_FIELDS from the encoder module and assert the decoder's stripAgUiTimingStamps list covers every stamped field, so a third transport field stamped later can't leak into legacy data the way elapsedMs/emittedAt already did once (fixed in legacy-run-read-adapter.ts, commit 3ee902f). - Declare UrlCited's title as v.unknown().optional() like its DocumentCited and FileAttached siblings instead of reading it through a cast. - Mirror toRenderableCustomChunk for UrlCited's sourceId: fall back to url when it is absent or empty instead of requiring it. Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
One sample per native type in both emission shapes, generated from the builders and pinned with its digest. The veryfront-api copy pins the same digest, so drift on either side fails a test. The pinning test reads the fixture off disk to hash its bytes, so it lives under tests/integration/semantic-unit-boundary/ per the semantic unit-boundary audit rather than beside the colocated unit tests. Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
…SE wire schema The internal-agents AG-UI SSE handler formats ToolCallStart payloads through an allow-list schema before writing to the wire. The live encoder now stamps parentMessageId on ToolCallStart (P4), but this schema did not declare the field, so it was silently dropped on this production path. Add it as optional, matching the encoder's own conditional emission, and update the two pinned test fixtures that this regressed. Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
…rough native conversion
Two findings from codex review:
- buildNativeRunEventFrame's "tool-call-status" case only carried
toolCallId, status, toolCallName, and parentMessageId into the native
TOOL_CALL_STATUS_CHANGED record, dropping any arguments/result/error/
exitCode fields the legacy Custom wrapper passed through unchanged.
src/eval/agent-service.ts's applyToolCallStatusEvent still reads those
off the native record when a standard tool result is absent, so
conversion silently lost trace data. Widen ToolCallStatusChangedInput
with an index signature and spread the source record through, the way
buildChildRunStatusChangedEvent already does.
- normalizeConversationRunEvents() routed an oversized native record
(URL_CITED, DOCUMENT_CITED, FILE_ATTACHED with a large inline `data:`
url, or any other native type) through summarizeGenericEvent(), whose
`{ type, truncated, note, summary }` shape drops the API-catalog-
required fields a native type carries. Unlike the permissive legacy
CUSTOM wrapper this replaced, that fails validation and the durable
append rejects it. Truncate the oversized `url` field directly for the
three citation/attachment types, keeping mediaType/sourceId/filename
intact, and fall back to the existing CUSTOM-typed omission event for
any other native type that somehow lands here.
Added regression coverage for both in run-events.test.ts.
Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
Fixes I1 and M1-M6 from the 2026-09-09 native-run-events-producer final whole-branch review: - I1: buildUrlCitedEvent/buildDocumentCitedEvent/buildFileAttachedEvent no longer let an empty title/filename/url reach the durable record the API's batch append route validates (z.string().min(1).optional() rejects empty string outright). The live wire frame keeps the field unguarded, since the chat decoder in src/chat/ag-ui.ts uses a string title (DocumentCited) or url (FileAttached) -- empty string included -- as its gate for rendering the citation/attachment at all; dropping it from the live frame too broke that rendering (caught by codex review). DocumentCited's title additionally falls back to sourceId instead of ever being empty in either shape, since it is required at the chat UI type level and has no safe non-empty fallback story once already stored -- unlike FILE_ATTACHED's url, which has no safe placeholder (a fake url would be a misleading, possibly broken link) and is documented as a known, accepted replay-rendering gap for the rare case of an attachment chunk with an explicitly empty url. - M1/M2: run-event-normalization.ts's oversized-citation truncation now shrinks URL_CITED's sourceId alongside url when it mirrors an oversized url (truncateEventStringFieldToLimit gained a mirrorField parameter for this), and drops DOCUMENT_CITED from the url-truncation case since it has no url field and already fell through to the same omission event either way. - M3: the seven native wire names are declared in ag-ui-sse.ts's payload schema allow-list and AgUiEventName union, each `.passthrough()`-ed so extension fields survive. - M4: removed the unreachable second `data-` routing copy in the live encoder's default branch. - M5: legacy-run-read-adapter.ts's two twin-reconstruction sites now spread the stored value before the derived key, so a smuggled action/type inside the stored value cannot win over the value the reader derived. - M6: isNativeRunEventName gained a JSDoc note that it exists for module consumers, per the P1 spec requirement. Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
…ble shapes
Ruling on the previous commit's I1 shape: revert the live/durable payload
split. One payload feeds both emission shapes (matching the cross-repo
contract fixture's durable === { ...live.payload, type } invariant), because
the live SSE frame is not only this repo's own chat client -- the API
ingests the same frame and stores it, so a value the batch append route
would reject is exactly as unsafe there as in the durable record.
- native-run-events.ts: toFrame() takes one payload again. The empty-string
drop generalizes to omitInvalidOptionalStrings, which also drops null,
numbers, and other non-string values for title/filename/url -- not just
the empty string -- since the API's z.string().min(1).optional() rejects
all of those the same way (caught by codex review after the first version
only handled the empty-string case).
- src/chat/ag-ui.ts: the DocumentCited and UrlCited decoder cases now fall
back to the citation's resolved source id when title is absent, since the
encoder no longer carries an empty one on either shape. DocumentCited
falls back unconditionally (ChatSourceDocumentUiPart.title is a required
chat UI field); UrlCited falls back only for a genuinely absent title, not
a present-but-wrong-typed one, preserving the existing "drops a non-string
title" behavior. FileAttached is unchanged: a missing url still falls back
to a raw data-file chunk, matching what the legacy Custom path's
toRenderableCustomChunk already did for a missing url, since a url has no
safe non-empty placeholder.
- src/chat/ag-ui-helpers.ts: toRenderableCustomChunk's source-url and
source-document cases get the same title fallback, mirroring the two
decoder cases above. This function decodes the reconstructed CUSTOM twin
a replayed native URL_CITED/DOCUMENT_CITED durable record produces via
legacy-run-read-adapter.ts, a code path the first version of this fix
missed entirely (caught by a second codex review pass): without this, a
citation that rendered live would disappear the moment its run was
replayed.
RED/GREEN verified for every fix by reverting to the prior behavior and
confirming the corresponding new test failed, then restoring; codex review
--uncommitted run four times across this fix, each fixing what the previous
pass found, ending clean.
Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
…ged schema Applies N1 and N2 from the scoped re-review at .superpowers/sdd/2026-09-09-native-run-events-producer/final-rereview.md (range 355d5e7..1746359, approved with 0 Important / 4 Minor). N3 and N4 are left per the controller's ruling. - N1: four stale cross-references left by the previous commit's rename and deletion. Three comments still named `omitEmptyStrings`, renamed to `omitInvalidOptionalStrings` in that commit. Two comments cited `ag-ui.ts:1039` for a `{ ...payload, type: "source-document" }` pattern that commit deleted; reworded to cite the surviving `{ ...value, type: definition.legacyCustomName }` pattern in the same reader instead. One comment in src/chat/ag-ui.ts pointed at "the matching comment in the DocumentCited fallback above", which that commit removed entirely (DocumentCited no longer has a title-driven fallback branch); replaced with a self-contained explanation of the FileAttached case. ag-ui.test.ts's "tolerates a null optional field" test had its rationale reworded from "the builder preserves null" (no longer true -- omitInvalidOptionalStrings drops it) to "the decoder tolerates a null it receives on the wire" (still true; the test feeds hand-built frames that bypass the builder). - N2: src/internal-agents/ag-ui-sse.ts's ToolCallStatusChanged schema declared toolCallName as a required nullable string, matching the API catalog but not the previously unvalidated pass-through this allow-list replaced. A frame missing the field now reaches formatAgUiEvent and throws instead of reaching the wire; that throw is uncaught at run-stream.ts:1220 (aborts the run) and silently swallowed at ag-ui/handler.ts:192 (ends the stream early) -- both worse than the dropped-field failure mode this file's allow-list exists to prevent. Loosened to `.optional()`, matching the decoder's own `payload.toolCallName === null || typeof payload.toolCallName === "string"` tolerance for an absent value. Added a test confirming a frame without toolCallName still reaches the wire. Gates run: deno task fmt, lint, lint:test-typecheck, typecheck (all clean); deno task test:file on every touched test file (all green). RED/GREEN verified for N2 by reverting the schema change and confirming the new test failed, then restoring. Claude-Session: https://claude.ai/code/session_01NonPHDcbWsisd2GFB68ALo
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📝 WalkthroughWalkthroughThis change adds native AG-UI run events for tool status, input-request lifecycle, child-run lifecycle, citations, and file attachments. It routes live and durable encoders through shared builders, updates readers and chat decoders for compatibility, and propagates ChangesNative run-event protocol rollout
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~75 minutes Merge Risk: 🟡 Moderate · up to Native tool-status or child-run events carrying a legacy type field can be read back under the wrong event type, breaking native event handling. Strip the reserved field before merging payloads. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 43.48% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 46 functions across 38 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches 💡 2📝 Generate docstrings 💡
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📦 Client bundle boundary
A server module in a client graph aborts hydration in the browser. New leaks fail CI; known leaks are tracked in |
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Automated review — Score: 80/100 (good, minor suggestions)Large, well-executed refactor (39 files, +3352/-214) that replaces AG-UI Strengths
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Inline comments:
In `@src/agent/ag-ui/native-run-events.ts`:
- Around line 155-156: Update toFrame to remove the reserved type property from
payloads before constructing both live and durable frames, while preserving all
other payload fields and the mapped native event name. Add a regression test
that passes an input payload containing an extra type field and verifies it is
absent from the resulting frames.
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📒 Files selected for processing (39)
src/agent/ag-ui/chat-ui-chunk-encoder.test.tssrc/agent/ag-ui/encoder.test.tssrc/agent/ag-ui/encoder.tssrc/agent/ag-ui/lifecycle-adapter.test.tssrc/agent/ag-ui/lifecycle-adapter.tssrc/agent/ag-ui/native-run-events.test.tssrc/agent/ag-ui/native-run-events.tssrc/agent/ag-ui/sse-parser.test.tssrc/agent/ag-ui/sse-parser.tssrc/agent/child-run/invoke-agent-child-runs.test.tssrc/agent/child-run/invoke-agent-child-runs.tssrc/agent/conversation/legacy-run-read-adapter.test.tssrc/agent/conversation/legacy-run-read-adapter.tssrc/agent/conversation/lifecycle-run-event-adapter.test.tssrc/agent/conversation/lifecycle-run-event-adapter.tssrc/agent/conversation/run-event-normalization.tssrc/agent/conversation/run-events.test.tssrc/agent/conversation/run-events.tssrc/agent/hosted/durable-child-fork-execution.test.tssrc/agent/input/request-protocol.test.tssrc/agent/runtime/chat-stream-handler.test.tssrc/agent/streaming/executor-data-producers.test.tssrc/agent/streaming/lifecycle/live-adapter.test.tssrc/agent/streaming/lifecycle/live-adapter.tssrc/agent/streaming/lifecycle/reducer.test.tssrc/agent/streaming/lifecycle/reducer.tssrc/agent/streaming/lifecycle/runner.tssrc/agent/streaming/lifecycle/types.tssrc/chat/ag-ui-helpers.tssrc/chat/ag-ui.test.tssrc/chat/ag-ui.tssrc/eval/agent-service.test.tssrc/eval/agent-service.tssrc/internal-agents/ag-ui-sse.test.tssrc/internal-agents/ag-ui-sse.tssrc/provider/runtime-loader.test.tssrc/provider/runtime-loader/tool-input-status.tstests/fixtures/contracts/native-run-events.jsontests/integration/semantic-unit-boundary/src/agent/ag-ui/native-run-events-contract.test.ts
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@codex review Please review final head The broader review concerns are also covered:
Final focused regressions pass (4 tests, 84 steps); broader event and consumer coverage passes (93 tests, 1,144 steps). Type checks, lint, formatting, test audits, generated API references, and diff checks pass. Full unit and CI checks are running. |
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Addressing the automated review's five concerns:
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2 participants
Veryfront now emits native run events for tool status, input requests, child-run status, citations, and attachments across live SSE and durable publication. A shared vocabulary produces both shapes, and the readers continue to accept legacy Custom events.
The public child-run Custom-event builders, schemas, types, and publisher callbacks retain their existing contract. Native conversion happens at the shared direct-append and mirror publication boundary. Both chat decoder validation paths accept omitted, null, or string tool names from the internal SSE formatter, in strict and permissive modes. Reserved
type,elapsedMs, andemittedAtfields are removed before application values become native payloads. Input records cannot override the native wire type or transport clocks; nested application metadata remains intact.The scope spans producers, transport, persistence, replay, chat decoding, and evaluation because each must agree on the event shapes. The shared contract fixture and reader round trips cover those boundaries. The browser vocabulary stays separate to preserve client bundle boundaries, with tests that check it against the producer vocabulary.
Oversized tool-status, input-request, and child-run records produce bounded omission markers that retain the original event type and tool call ID where available. Dedicated tests cover all four stored lifecycle types. Full payload retention for those oversized records remains outside this change.
Deployment requires API support for these native events before the runtime ships. Staging validation of a slow tool call, citation, and child run remains outstanding. The runtime-context Custom event is unchanged and outside this PR.
Validation uses the pinned Deno 2.7.7. Focused regressions reproduce the public API, native-type, and optional tool-name failures before their fixes. The final broader event and consumer suite passes: 93 tests and 1,173 steps. The latest timing regressions and encoder cases pass: 5 tests and 90 steps. Twenty timestamp-collision cases failed before their fix. Types, lint, formatting, client-bundle boundaries, test audits, generated references, and diff checks pass. The CI/CD workflow and Codex review pass for
4d21b9d7901e45b4fab34073e416d5f5c45fcd02. All review threads are resolved, and the PR is conflict-free and ready for review.