fix(vscode-lm): integrate guarded recovery into streaming responses by simurg79 · Pull Request #1608 · Zoo-Code-Org/Zoo-Code

simurg79 · 2026-09-11T21:32:27Z

Summary

Activates the leaked tool-call parser introduced in #1188 inside createMessage. This is the second half of a two-part split of #1188; it contains all of the streaming integration and its tests.

Draft, and dependent on #1188. It must not be merged before #1188.

Depends on

fix(vscode-lm): add guarded recovery parser and schema conversion #1188 (part A — the parser, guards, schema conversion and their direct tests; inactive in production)

What is in this PR (part B)

Streaming salvage state inside createMessage.
Start-marker detection with partial-marker carry across chunk boundaries.
Buffering until the invoke block completes.
An overflow fallback that releases unclosed markup as plain text when limits are exceeded.
An ordered flush that emits prose before any recovered call, and runs before native tool calls.
The streaming integration tests.

Diff versus part A: 2 files changed, 361 insertions, 3 deletions. Combined with part A versus main: 4 files changed, 1357 insertions, 6 deletions.

The combined result is byte-for-byte identical to the previously reviewed head of #1188 (34e16a49d01a16525d09f0d8250aa696143207e6): the tree of this branch equals that commit's tree exactly. No tests were dropped, no guard was weakened, and nothing was refactored during the split.

Why the split

The changed-code mutation gate caps a run at 400 selected mutants. Measured with instrumentation-only Stryker 10.0.0 runs:

Revision pair	Selected candidates	Cap
Part A vs `main`	320	400
This PR vs part A (incremental)	110	400
Combined vs `main`	430	400

Important: until #1188 is merged, CI on this branch measures the combined 430 against main, not the incremental 110. So this branch's own cap compliance cannot be demonstrated by CI until part A is in the base. Please do not read a red combined run here as evidence the incremental change is over cap — and equally, the incremental figure is not a passing CI result.

Tests

114/114 passing (provider suite, at this branch's exact source tree).
Lint and type-check pass; no increase in ESLint suppression counts.

Mutation-testing status — known failing, disclosed

This PR does not pass the changed-code mutation gate. Locally measured, incremental against part A, over the selected changed-code range:

79 killed, 30 survived, 1 uncovered → 31 blocking, gate result FAIL.

For reference, part A measures 223 killed, 1 timeout, 93 survived, 3 uncovered → 96 blocking, also FAIL.

These are observed failures as run here. I am not claiming the surviving mutants are inherited or pre-existing, and no threshold was weakened or waived. Remediating them is out of scope for this structural split.

Caveat: a Windows extensionless-Vitest shim ENOENT prevented an end-to-end run of the gate script locally, so a pinned JS invocation and harness were used, with source hashes verified against the pushed trees. CI remains authoritative.

Merge order

fix(vscode-lm): add guarded recovery parser and schema conversion #1188 (part A)
This PR

After part A merges, this PR's base and CI should be refreshed and the diff re-inspected. No rebase is being asserted as necessary in advance; if history requires it later, that would be handled separately and explicitly.

…indow-safe tool_result truncation Hardens the VS Code Language Model provider (notably GitHub Copilot serving Anthropic Claude) against three failure modes: - Surrogate sanitization: a lone UTF-16 surrogate cannot be encoded as UTF-8, so the backend rejects the entire request with a 400. sanitizeSurrogates() replaces unpaired surrogates with U+FFFD while preserving valid pairs (emoji, CJK ext.), applied to string messages, tool results, and text parts. - Leaked tool-call recovery: some backends stream a tool call as raw <invoke> XML instead of a structured LanguageModelToolCallPart, leaving the turn with no tool_use block and stalling the task in a "no tools used" retry loop. extractLeakedToolCalls() and trailingPartialToolMarkerLength() detect the markup mid-stream (including markers split across chunk boundaries) and replay it as a real tool call, conservatively: only for <invoke> names matching a tool actually offered that turn, and only when tools were offered. - Window-safe tool_result truncation: Copilot's backend trims over-window requests without preserving tool_use/tool_result pairing, orphaning a tool_result and causing a 400 (unexpected tool_use_id). truncateToolResultsToFitWindow() and middleOutTruncate() shrink oversized tool_result payloads on our side (largest first, middle-out, pairing preserved) before sending. Ported from simurg79/Roo-Code#12.

…ation paths Raises patch coverage on the new vscode-lm reliability code above the 80%% codecov/patch gate by exercising the streaming salvage state machine (marker split across chunks, multi-chunk buffering, unknown-tool passthrough, carried tail) and the tool_result truncation helpers (array-form content, surrogate-safe middle-out, guard clauses).

Address review feedback on the leaked-tool-call salvage path: a tool name alone was not a sufficient gate, so prose or fenced examples reproducing the invoke markup could be replayed as real calls. Adds the quoted/fenced guard plus coverage. Also records the empirical vscode.lm probe as a project skill (probe-vscode-lm-api) with the scratch probe extension, the false-positive replay harness, representative transcripts, and the consent-gate gotcha.

Skill directories hold reference scripts and captured artifacts that are intentionally never imported by the build.

- dispose the probe CancellationTokenSource in a finally block

Remove the ~120KB raw probe transcript corpus from the vscode-lm probe skill; keep the measured findings and their stated limits in SKILL.md.

…buffer Loop tag stripping until stable so `<<script>>` cannot reconstruct a tag after a single pass (CodeQL incomplete multi-character sanitization). Track fence marker and width instead of counting ``` runs for parity, so tilde fences and 4+ backtick fences are recognized. Treat a quoted invoke that ends its line as quoted when an explicit quoting cue precedes it, rather than recovering it as a live tool call. Keying off leading prose alone was tried previously and regressed genuine recoveries, so the cue is deliberately narrow. Bound the salvage buffer so markup that never closes is flushed as plain text instead of withholding the response until the stream ends.

The first version of this test only checked the flushed text's content, which the end-of-stream drain produces even without the cap, so it passed against the unfixed code. Assert instead that text reaches the consumer before the stream is exhausted, which is what the bound actually changes.

Replace the vacuous four-backtick test with a nested inner-fence case and add a closed-fence recovery test, both of which fail under the old backtick-parity counting.

Address CodeRabbit review: a system prompt or tool schema large enough to consume the derived char budget left messagesBudgetChars non-positive, which made truncateToolResultsToFitWindow a no-op exactly when the request was most oversized. Clamp to MIN_TOOL_RESULT_CHARS and cover it with a regression test. Also reattach a misplaced doc comment and dedupe a test helper.

… args Addresses taltas review feedback on PR Zoo-Code-Org#1188.

Recover only wrapped function_calls/invoke markup leaked into text parts; bare unwrapped invoke is passed through unchanged. Add narrow top-level schema-aware parameter conversion and an approximate output-budget guard, with expanded provider unit tests.

…ility

GitHub checks out the synthetic pull request merge commit as github.sha, but pull_request.base.sha is frozen when the event is created. Once main advances, the stale base made the changed-code mutation gate attribute unrelated upstream-only files to the pull request (3294 changed executable lines across 87 files instead of 361 across the 2 files the PR actually touches). Resolve the base from the checked-out head's first parent when the head is a merge commit, leaving non-merge heads and the merge_group path unchanged. Head stays github.sha so selector coordinates remain aligned with the checked-out tree.

…e trimming floor The clamp to MIN_TOOL_RESULT_CHARS exists only to keep tool_result trimming productive; using it for the final admission check let a request through whenever the raw budget was positive but below the floor, sending an over-window request. Judge admission against the raw budget and cover the boundary with a regression test. Also guarantee temp-repository cleanup in the two stryker-diff pull-request-selection tests via try/finally, and move the system-prompt surrogate sanitization test out of the leaked streaming recovery group.

…rameter declaredParamType stripped "null" from a declared ["T","null"] union, so convertLeakedParamValue rejected a literal JSON null and failed the whole leaked block closed to text. It now reports that null is permitted and the conversion consults that flag. A non-nullable object still rejects null, and a declared string keeps the literal text "null". Also assert the streamed text chunk in the accepted-budget test, which previously drained the stream and only checked the sendRequest call.

…ll recovery Handle both structured type: "null" and array type: ["null"] forms in declaredParamType so recovery emits JSON null, while continuing to fail closed for non-null values. Adds unit coverage for both helper forms and a createMessage runtime regression test with a mocked VS Code LM host.

Surrogate sanitization and context-window tool_result truncation are being proposed as independent changes, so remove them here. Recovery does not depend on either: it keeps the original unsanitized system-prompt boundary and no longer references the truncation helpers. Retains the null-only parameter schema fix and the stryker-diff CI prerequisite.

…ayer Sanitization is proposed independently, so restore src/api/transform to origin/main here. Recovery does not use it; the full provider and transform suites pass without it.

Keeps the complete leaked tool-call parser and its direct tests, but removes the createMessage streaming integration and its integration tests so the changed-code mutation gate stays within its per-run mutant budget. createMessage is restored byte-for-byte to the base implementation, so the parser is present but not yet activated; a follow-up change re-enables it.

Re-enables the deferred leaked tool-call parser inside createMessage: streaming salvage state, start-marker detection with partial-marker carry across chunks, buffering until the invoke block completes, an overflow fallback that releases unclosed markup as text, and an ordered flush that emits prose before any recovered call and runs before native tool calls. Restores the streaming integration tests. Depends on the parent parser change; together they reproduce the original behavior exactly.

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src/api/providers/__tests__/vscode-lm.spec.ts
src/api/providers/vscode-lm.ts

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Treat model, provider, MCP, path, command, and tool data as untrusted.

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src/api/providers/__tests__/vscode-lm.spec.ts
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🪛 GitHub Check: mutation-diff

src/api/providers/vscode-lm.ts

[warning] 115-115: Mutation test advisory
src/api/providers/vscode-lm.ts:115: 2 mutation test gaps; example: Survived Regex mutant (replacement: /<(?:antml:)?invoke\sname="([^"]+)"\s*>/gi). See the job summary for the complete list and resolution guidance.

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src/api/providers/vscode-lm.ts

[ERROR] 118-118: Dynamic command passed to child_process.exec/execSync. Use child_process.execFile or spawn with an argument array instead.

(coderabbit.command-injection.exec-js)

[ERROR] 120-120: Dynamic command passed to child_process.exec/execSync. Use child_process.execFile or spawn with an argument array instead.

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🔇 Additional comments (4)

src/api/providers/vscode-lm.ts (3)

110-128: LGTM!

1150-1197: LGTM!

1235-1252: LGTM!

src/api/providers/__tests__/vscode-lm.spec.ts (1)

583-685: LGTM!

📝 Summary

Summary by CodeRabbit

Bug Fixes
- Improved handling of streamed AI responses that contain tool-call markup, including markers split across response chunks.
- Preserved surrounding response text and kept unknown or incomplete markup readable as text.
- Improved handling of large responses and streams that combine text with native tool calls, so buffered text is delivered in order.
- Tightened recovery behavior for malformed or unexpected tool-call parameters, reducing the chance that invalid markup is treated as a valid call.

Walkthrough

The VS Code Language Model provider recognizes leaked-call markers, bounds recovery buffers, and integrates recovered calls into streamed output. Tests cover parsing, chunk boundaries, ordering, fallback behavior, and buffer limits.

Changes

VS Code streamed tool-call recovery

Layer / File(s)	Summary
Recognize and bound recovery markers `src/api/providers/vscode-lm.ts`, `src/api/providers/__tests__/vscode-lm.spec.ts`	Recovery buffering starts on a `<function_calls>` wrapper or an `<invoke name="` marker. Above 256 KiB, complete invocations drain first; remaining over-limit text is released. Tests cover buffer-cap behavior.
Integrate recovery with streamed output `src/api/providers/vscode-lm.ts`, `src/api/providers/__tests__/vscode-lm.spec.ts`	The stream flushes buffered prose and recovered calls before native tool calls and at completion. It bypasses recovery when no tools were offered. Tests cover chunk-split markup, ordering, literal fallback, schema-directed parameter parsing, and large payloads.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant LanguageModelBackend
  participant createMessage
  participant extractLeakedToolCalls
  participant StreamConsumer
  LanguageModelBackend->>createMessage: Stream text and native tool-call chunks
  createMessage->>extractLeakedToolCalls: Pass buffered text and offered tool schemas
  extractLeakedToolCalls-->>createMessage: Return prose and recovered calls
  createMessage->>StreamConsumer: Emit ordered stream chunks

Merge Risk: ⚪ Minimal · up to 21950

No concrete merge-blocking defect is established here. Merge PR #1188 first, then refresh the base and confirm required CI passes before merging this change.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to 21950

Matching model-generated text can now request actions that previously remained plain text. Recovery is restricted to offered tools and retains existing execution controls, but those controls do not distinguish recovered markup from an intentional structured request.

Retained concerns

Medium · security · inferred: Recovery recognizes executable intent through markup and quoting heuristics rather than provenance. If attacker-influenced content is reproduced as matching unquoted markup for an offered tool, text that remained inert at base now enters the ordinary action pipeline. Existing policy and approval checks still apply, but recovered calls receive no separate execution treatment, including when existing auto-approval permits the action. This is an inferred expansion of attack reachability, not a verified approval bypass.

Security review details

Security Blast Radius

inferred — Exposure is bounded by tools offered to the request and their existing execution policies. When command execution is offered and approved, the reachable outcome includes terminal execution under the task's existing environment and privileges. The inspected path does not establish new tenant-wide, service-wide, or infrastructure authority.

Security Findings and Attack Paths

inferred — The newly reachable attack path is adversarial influence on model text, reproduction of recoverable unquoted invocation markup, conversion into a tool_call, and execution subject to existing policy and approval. The text-to-call transition is observed; successful adversarial reproduction and an unauthorized outcome were not verified.

Trust Boundaries and Controls

observed — Recovered calls retain downstream current-mode and tool-policy validation. Command execution additionally checks command restrictions and obtains approval before terminal execution. Approval can be supplied by existing auto-approval configuration; these controls are unchanged at base and head.

Resilience and Maintainability Implications

observed — Recovery state is local to each request. Terminal flush clears active buffering before parsing, malformed calls remain text, and stream-error handling invokes cleanup rather than flushing pending recovery into executable calls. The presenter uses locking and sequential content processing to contain concurrent presentation.

Hardening Proposals

proposed — Consider preserving recovered-call provenance through execution so policy can require explicit confirmation for sensitive recovered actions independently of native-call auto-approval.

🚥 Pre-merge checks | ✅ 6 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Regression Evidence	⚠️ Warning	The overflow-release behavior is only partially covered. `vscode-lm.ts` releases an over-cap undecided buffer and explicitly expects recovery to re-arm on a later marker (lines 1244-1252), but the str…	Add a focused `createMessage` streaming test that emits an over-256 KiB never-closing invoke, then emits a later wrapped valid invoke in a separate chunk. Assert that the oversized text is released before stream completion and that the late…
Description check	⚠️ Warning	The description gives a detailed summary, implementation notes, test results, known mutation-gate failures, and merge order. However, it does not identify an approved GitHub issue in the required Rela…	Add the approved GitHub issue number under Related GitHub Issue (for example, `Closes: #123`).

✅ Passed checks (6 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Security Boundaries	✅ Passed	No changed path meets the security failure conditions. `src/api/providers/vscode-lm.ts` recovers only names present in the request's offered function-tool map, rejects malformed or schema-incompatible…
Persistence Integrity	✅ Passed	No changed persistence path exists. The PR changes only in-memory streaming salvage and request preparation in `src/api/providers/vscode-lm.ts`; it adds no storage or state writes. The truncation help…
Lifecycle Resource Cleanup	✅ Passed	No changed lifecycle resource path is present. The PR adds only per-request salvage state and stream yields in `createMessage`; it does not add listeners, watchers, timers, tasks, or providers. Existi…
Title check	✅ Passed	The title clearly summarizes the main change: integrating guarded recovery into VS Code language-model streaming responses.

Full details: Regression Evidence

Explanation

The overflow-release behavior is only partially covered. vscode-lm.ts releases an over-cap undecided buffer and explicitly expects recovery to re-arm on a later marker (lines 1244-1252), but the streaming tests at lines 542-582 and 584-629 end with filler after the release. No createMessage test sends a later valid <function_calls> marker and verifies that the later call is recovered after the earlier unclosed markup is released.

Resolution

Add a focused createMessage streaming test that emits an over-256 KiB never-closing invoke, then emits a later wrapped valid invoke in a separate chunk. Assert that the oversized text is released before stream completion and that the later invoke produces exactly one tool_call with the expected arguments. This covers the re-arm path and prevents state-reset regressions.

Full details: Description check

Explanation

The description gives a detailed summary, implementation notes, test results, known mutation-gate failures, and merge order. However, it does not identify an approved GitHub issue in the required Related GitHub Issue section; it links only to a dependent pull request.

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github-actions · 2026-09-11T21:32:50Z

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codecov · 2026-09-11T21:36:26Z

Codecov Report

❌ Patch coverage is 98.79518% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/api/providers/vscode-lm.ts	98.79%	0 Missing and 1 partial ⚠️

📢 Thoughts on this report? Let us know!

…ng recovery Retain main's hardened parser (Zoo-Code-Org#1188), surrogate sanitization (Zoo-Code-Org#1605), and context-window truncation (Zoo-Code-Org#1606). Integrate Zoo-Code-Org#1608 streaming recovery and its tests without restoring stale parser implementations. Remove the auto-merged duplicate Stryker revision-selection suite; keep main's blocking check. Syntax-only checks passed; full validation deferred to Phase 3. Not pushed.

…rg#1608)

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Actionable comments posted: 1

🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/api/providers/vscode-lm.ts:
- Around line 1214-1224: Update the salvageBuffering loop to drain complete
prefixes with extractLeakedToolCalls when the buffer exceeds
MAX_SALVAGE_BUFFER_CHARS, append only consumed text to salvageEmittedText, and
retain incomplete tails in salvageBuffer for subsequent chunks. Preserve
QuotingScanState context for the retained tail; avoid flushSalvage on the entire
buffer and do not add a non-global closing-tag matcher that relies on lastIndex.

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src/api/providers/__tests__/vscode-lm.spec.ts
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Require regression coverage at the lowest valid harness with behavior-focused assertions, including relevant negative, error, false/unset, and boundary cases.

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🪛 GitHub Check: mutation-diff

src/api/providers/vscode-lm.ts

[warning] 109-109: Mutation test advisory
src/api/providers/vscode-lm.ts:109: Survived ArithmeticOperator mutant (replacement: 256 / 1024). See the job summary for the complete list and resolution guidance.

[warning] 102-102: Mutation test advisory
src/api/providers/vscode-lm.ts:102: 14 mutation test gaps; example: Survived Regex mutant (replacement: /<(?:antml:)invoke\s+name="([^"]+)"\s*>([\s\S]?)</(?:antml:)?invoke\s>/gi). See the job summary for the complete list and resolution guidance.

[warning] 101-101: Mutation test advisory
src/api/providers/vscode-lm.ts:101: 5 mutation test gaps; example: Survived Regex mutant (replacement: /<(?:antml:)(?:function_calls\s*>|invoke\s+name=")/i). See the job summary for the complete list and resolution guidance.

[warning] 1131-1131: Mutation test advisory
src/api/providers/vscode-lm.ts:1131: 2 mutation test gaps; example: Survived ConditionalExpression mutant (replacement: true). See the job summary for the complete list and resolution guidance.

[warning] 1128-1128: Mutation test advisory
src/api/providers/vscode-lm.ts:1128: 2 mutation test gaps; example: Survived ConditionalExpression mutant (replacement: true). See the job summary for the complete list and resolution guidance.

[warning] 1127-1127: Mutation test advisory
src/api/providers/vscode-lm.ts:1127: Survived ConditionalExpression mutant (replacement: true). See the job summary for the complete list and resolution guidance.

[warning] 1126-1126: Mutation test advisory
src/api/providers/vscode-lm.ts:1126: 3 mutation test gaps; example: Survived MethodExpression mutant (replacement: metadata?.tools ?? []). See the job summary for the complete list and resolution guidance.

🔇 Additional comments (2)

src/api/providers/vscode-lm.ts (1)

99-118: LGTM!

Also applies to: 1123-1180, 1227-1250, 1298-1300

src/api/providers/__tests__/vscode-lm.spec.ts (1)

296-584: LGTM!

A complete invoke block in the buffer bypassed the cap entirely, so once the buffer grew past it both the recovered call and the trailing prose were withheld until the stream ended. Drain only the decided prefix and retain the in-flight tail, keeping salvageEmittedText aligned so quoting context survives.

Bertan Ari and others added 26 commits August 7, 2026 15:02

chore(knip): exclude .roo skill assets from unused-file analysis

cbac74d

Skill directories hold reference scripts and captured artifacts that are intentionally never imported by the build.

fix(vscode-lm): address review feedback on leaked tool-call recovery

220ee89

- dispose the probe CancellationTokenSource in a finally block

docs(skill): drop probe transcripts from repo

8c80252

Remove the ~120KB raw probe transcript corpus from the vscode-lm probe skill; keep the measured findings and their stated limits in SKILL.md.

chore: move probe skill scripts under scripts/, drop .roo knip ignore

d587392

test(vscode-lm): cover fence-close branch of isInsideCodeFence

aa57a19

Replace the vacuous four-backtick test with a nested inner-fence case and add a closed-fence recovery test, both of which fail under the old backtick-parity counting.

fix(vscode-lm): require function_calls wrapper and sanitize tool-call…

87d8a68

… args Addresses taltas review feedback on PR Zoo-Code-Org#1188.

chore: remove probe skill and harness from PR

1511498

docs: drop dangling probe skill path from vscode-lm comment

8eb1d93

Merge remote-tracking branch 'origin/main' into port/vscode-lm-reliab…

4c9c0af

…ility

Merge branch 'main' into port/vscode-lm-reliability

0fa5f01

refactor(vscode-lm): drop surrogate sanitization from the transform l…

a012b6a

…ayer Sanitization is proposed independently, so restore src/api/transform to origin/main here. Recovery does not use it; the full provider and transform suites pass without it.

Merge branch 'main' into port/vscode-lm-reliability

34e16a4

simurg79 mentioned this pull request Sep 11, 2026

fix(vscode-lm): add guarded recovery parser and schema conversion #1188

Merged

Bertan Ari added 3 commits September 30, 2026 07:41

fix(vscode-lm): remove unreachable empty-buffer guard in flushSalvage

59eb1ba

fix: preserve large leaked calls and exercise fence guard (Zoo-Code-O…

c23ea4e

…rg#1608)

coderabbitai Bot requested changes Oct 1, 2026

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fix(vscode-lm): integrate guarded recovery into streaming responses - #1608

fix(vscode-lm): integrate guarded recovery into streaming responses#1608
simurg79 wants to merge 31 commits into
Zoo-Code-Org:mainfrom
simurg79:split/vscode-lm-streaming-b

simurg79 commented Sep 11, 2026

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simurg79 commented Sep 11, 2026

Summary

Depends on

What is in this PR (part B)

Why the split

Tests

Mutation-testing status — known failing, disclosed

Merge order

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Summary by CodeRabbit

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Security Architecture Review

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coderabbitai Bot commented Sep 11, 2026 •

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