fix(agent): recover interrupted local tool streams - #3726
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📝 WalkthroughWalkthroughStreaming runtime execution now recovers once from interrupted local tool-call batches. It skips incomplete calls, records tool errors, preserves partial input and placeholders, and retries when another agent step remains. Provider-executed calls remain on their existing path. ChangesInterrupted local tool-call recovery
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to This change adds bounded recovery for interrupted local tool calls, but merge readiness remains uncertain because one regression expectation may disagree with the resulting terminal error behavior and part of the recovery path may be unreachable, which could leave interrupted calls mishandled in production. These issues should be resolved or explicitly accepted before merging. Sequence Diagram(s)sequenceDiagram
participant AgentRuntime
participant shouldContinueAfterStreamStep
participant LocalToolExecutor
participant SSEStream
AgentRuntime->>shouldContinueAfterStreamStep: Check recovery and remaining steps
shouldContinueAfterStreamStep-->>AgentRuntime: Continue for interrupted local calls
AgentRuntime->>LocalToolExecutor: Skip interrupted calls and record errors
AgentRuntime->>SSEStream: Emit deduplicated recovery output
AgentRuntime->>AgentRuntime: Retry the interrupted batch once
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In `@src/agent/runtime/refresh.test.ts`:
- Around line 1702-1705: Update the tool-output-error count assertion in the
interrupted-batch recovery test to expect three events, while preserving the
existing call-count, mutation-order, and recovery-message assertions.
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src/agent/runtime/index.tssrc/agent/runtime/refresh.test.tssrc/agent/runtime/tool-result-continuation.test.tssrc/agent/runtime/tool-result-continuation.ts
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Recovery now treats every unfinished local call, including zero-delta placeholders, as the same bounded batch interruption. A terminal local streamed result closes the recovery path because re-calling the model could repeat an already-applied mutation. Constraint: Provider-executed calls and exhausted step budgets remain fail-closed Rejected: Keep placeholder recovery outside the retry latch | repeated placeholders could consume every remaining step Confidence: high Scope-risk: narrow Reversibility: clean Directive: Do not retry an interrupted local batch after any matching final local streamed result Tested: 9 focused suites, 242 steps; repository fmt, lint, typecheck; generated API reference check Not-tested: Live provider stream truncation
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A finalized local call emits tool-input-available before the stream step is evaluated. Recovery now stops when any local sibling reached that boundary, even if its result never arrived, because a client callback may already have applied the mutation. Constraint: Safe recovery is limited to batches where every local call remains uncommitted Rejected: Retry finalized local siblings without results | public client callbacks can execute them before server recovery Confidence: high Scope-risk: narrow Reversibility: clean Directive: Buffer local input-available events before widening recovery to mixed finalized and interrupted batches Tested: 9 focused suites, 242 steps; repository fmt, lint, typecheck; generated API reference check Not-tested: Live browser callback side effects under provider truncation
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…el-tool-stop # Conflicts: # docs/api-reference/veryfront/agent.md
Interrupted recovery now ends replay-prefix comparison at each non-text stream boundary. A suppressed prefix cannot be re-emitted after a provider tool or reasoning event when a later text segment diverges. Constraint: Provider and reasoning events must remain live while replay text is withheld. Rejected: Compare the full recovery text across event boundaries | it reorders a retained prefix after an already-delivered tool event. Confidence: high Scope-risk: narrow Directive: Treat each text segment around non-text events as an independent replay candidate. Tested: 4 focused suites, 184 steps; fmt, lint, check; full pre-push 3815 tests and 28535 steps plus cwd suites. Not-tested: Live browser rendering with a provider-native tool.
…llel-tool-stop' into fix/incomplete-parallel-tool-stop
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Recovery declined after exposed reasoning terminated the run with an interrupted local tool call whose tool-input-start was still buffered. recordToolError gates its tool-output-error on inputAnnounced, which is never true for such a call, so the stream ended after the reasoning block with no text, no tool call and no error. Flush the buffered tool-input-start on that path so the failure renders as a tool card matching what the assistant message already persists. Log the declined recovery with step, tool name and persisted reasoning part count. The check re-asks shouldContinueAfterStreamStep with the gate lifted, so it fires only when a batch would actually have been replayed. Move the "was this reasoning persisted?" predicate into isPersistedReasoningPart, exported from streamed-assistant-message.ts and used by both the message builder's skip check and the recovery gate. It was stated twice as exact logical negations; a new StreamingReasoningPart field could have updated one and silently re-permitted replay. Reasoning is default-on across the hosted catalog, so the gate makes #3726 inert on most hosted paths. Track the reconciliation protocol that would lift it in #3736 and reference it from the gate.
Summary
Why
A provider stream can finish with
finishReason: stopwhile a local tool call is still receiving arguments. The continuation gate previously stopped immediately, so a lone interrupted call could be silently dropped and persisted as completed.Recovery is bounded to one attempt and only starts before a tool input reaches the public
onToolCallcallback. If a parallel sibling was already exposed, a retry could repeat a client-side mutation under a new tool-call ID, so that step remains fail closed and the terminalization path reports the interruption instead.Red-green TDD
The original regression failed on
mainbecause a lone truncated call made one model request and then ended without execution or continuation. It now makes one bounded recovery request, executes the reconstructed call exactly once, and produces the final response.Follow-up regression tests prove that recovery does not run after a sibling input was exposed, after a local result became final, alongside unresolved or completed provider work, after the step budget is exhausted, or after the recovery latch has been used.
The exhausted-recovery test also proves that a placeholder beside substantive text remains in history before its terminal error result, preventing an orphan result on the next provider turn.
The duplicate-text regression failed because the recovery step emitted and persisted the same assistant sentence twice. Recovery now buffers the ordered recovery output and removes text events and chunk callbacks only when the completed text exactly repeats the prior answer.
A distinct-text regression failed because the previous suppression also hid a legitimate replacement answer. Distinct terminal text now reaches SSE, chunk callbacks, the final response, and persisted history. A provider-result regression also proves that the unsuppressed stream state controls continuation, so a terminal recovery does not trigger an extra model step.
A prefix-extension regression failed because a recovery could replay the complete prior sentence before appending new text. Recovery now removes the delivered prefix across SSE deltas and chunk callbacks, persists only the new suffix, and retains the complete recovered answer in the final response.
A shorter-prefix regression failed because a truncated recovery replay was emitted and replaced the complete final text. Recovery now treats text in either prefix direction as already delivered, suppresses the replay, and retains the longer prior answer.
Public-response regressions failed because both a truncated input fragment and an empty-object placeholder appeared as failed calls beside the successfully reconstructed tool calls. Recovery still persists the model-visible error result, but omits the uncommitted fragment from
AgentResponse.toolCalls.Verification
deno task fmt:checkdeno task lintdeno task typecheckdeno task docs:api-reference:check: 44 files currentdeno task test:unit: 3815 tests and 28526 steps passed, 1 test and 5 steps ignoredThe extra
scripts/hooks/pre-pushquick-verification stage is blocked by four inheritedlint:cli-boundaryfindings that reproduce unchanged on exactorigin/maina2356cab03e4f518c726ead52801439e53de0fc5: three imports incli/commands/generate/command.tsand one import incli/commands/build/error-handler.ts. The #3726 diff does not touch those files. Exact-head GitHub CI must be green before this PR is marked ready.Closes veryfront/veryfront-issue-inbox#466
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Bug Fixes
Documentation
Tests