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…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.
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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📝 SummarySummary by CodeRabbit
WalkthroughThe VS Code Language Model provider now recovers leaked invocation markup only from named invokes inside a ChangesVS Code streamed tool-call recovery
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant LanguageModelStream
participant createMessage
participant extractLeakedToolCalls
participant OutputStream
LanguageModelStream->>createMessage: Provide text chunks and native calls
createMessage->>extractLeakedToolCalls: Parse buffered text with preceding scan context
extractLeakedToolCalls-->>createMessage: Return prose and recovered calls
createMessage->>OutputStream: Emit ordered text and calls
Merge Risk: ⚪ Minimal · up to No actionable merge-blocking issue is established in this review. Merge after the stated prerequisite PR and normal CI checks. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Previously passive response text can now become executable tool requests. Existing tool restrictions and approval checks remain, but formatting heuristics cannot reliably distinguish intended calls from echoed examples. The new buffering also introduces local resource-containment risks. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
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Hardening Proposals
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…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.
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- 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
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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.
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Nice! Had 1 comment for the buffer handling.
…ge cap Cutting the drained span at the last </invoke> dropped a trailing quoting cue, so an over-cap stream recovered a call the one-shot path refuses. Extend the span to the end of that line and wait while the line is still open. Also assert distinct ids for multiple recovered calls.
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- Around line 141-142: Update decidedSalvageEnd so it does not select a newline
inside an incomplete invoke block as the drain boundary; keep that block in the
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src/api/providers/__tests__/vscode-lm.spec.ts (1)
590-620: LGTM!Also applies to: 624-625, 628-628
…oundary falls inside it
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- Around line 146-147: Update the next-opener search in the boundary logic to
scan the remaining buffer after blockEnd rather than stopping at lineEnd, so an
invoke opener with a newline before name= is preserved for extraction. Add a
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| */ | ||
| function decidedSalvageEnd(text: string): number { | ||
| const blockEnd = lastCompleteInvokeBlockEnd(text) | ||
| if (blockEnd === 0) { |
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Is the blockEnd === 0 early return covered by a test? Replacing the condition with false still passes the suite. With a newline in the buffer, it would drain a partial open-invoke line as text. A cap test with an unclosed invoke and a newline before the filler would pin it.
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930674d removed this guard along with cap draining. Suspect text now waits until EOF or the next native call, so there is no partial prefix drain to guard. In a6ea398, preserves a narrated block and later text with line ending %j covers both newline variants with 270 KiB of filler, exact full text, and zero recovered calls. Does removing the drain and covering the newline case address your concern?
| expect(streamedText).toContain(filler) | ||
| }) | ||
|
|
||
| it("keeps a narrated block quoted when the cap splits the stream after its close tag", async () => { |
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This case has no newline in its chunks, so decidedSalvageEnd returns 0 and the overflow branch releases everything as text. Does it cover the newline-after-cue path the fix targets? collect([block + narration + "\n", "x".repeat(270 * 1024)]) would exercise it. Assert no tool_call and that the text contains the narration.
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a6ea398 adds both variants, with and without the trailing newline. The test is now named preserves a narrated block and later text with line ending %j, replacing the obsolete cap name. It asserts zero recovered calls and the exact full text, including the narration, line ending, and 270 KiB of filler. Does that cover what you had in mind?
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- Around line 840-842: Update the `opener` generator in the split-invariance
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src/api/providers/vscode-lm.ts (1)
99-103: LGTM!Also applies to: 230-253, 693-702, 746-746, 1135-1192, 1216-1251, 1299-1301
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- Around line 529-535: Update the unknown-tool test in the test named “keeps an
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src/api/providers/__tests__/vscode-lm.spec.ts
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Treat model, provider, MCP, path, command, and tool data as untrusted.
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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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Check strict typing and exhaustive behavior across normal, boundary, error, cancellation, retry, and compatibility paths.
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Verify extension/webview contracts, cancellation and error propagation, VS Code lifecycle correctness, and behavior under retries and partial failure.
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Act as an adversarial second-opinion reviewer.
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src/api/providers/__tests__/vscode-lm.spec.ts
🪛 ast-grep (0.45.3)
src/api/providers/__tests__/vscode-lm.spec.ts
[warning] 821-821: Regular expression constructed from variable input detected. This can lead to Regular Expression Denial of Service (ReDoS) attacks if the variable contains malicious patterns. Use libraries like 'recheck' to validate regex safety or use static patterns.
Context: new RegExp(<(?:antml:)?(?:${WRAPPER}\\s*>|${INVOKE}\\s+name="), "i")
Note: [CWE-1333] Inefficient Regular Expression Complexity
(regexp-from-variable)
🔇 Additional comments (1)
src/api/providers/__tests__/vscode-lm.spec.ts (1)
297-528: LGTM!Also applies to: 536-1398
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
What is in this PR (part B)
createMessage.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:
mainmainImportant: 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
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:
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
ENOENTprevented 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
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.
Current buffering behavior and validation (a6ea398)
This section supersedes the earlier buffering and test summaries, which describe the original split. The earlier diff counts, tree equivalence, and mutation measurements are historical, not claims about this head.
930674d removed cap draining and its guard. Suspect leaked call text is buffered until normal EOF or the next native tool call, then parsed in one pass so chunk splits do not change the result compared with parsing the whole text segment at once. Buffered prose is emitted before recovered calls, and the segment is flushed before the native call. The chosen tradeoff is unbounded buffering of unresolved text and later delivery of both that text and recovered calls. Even a bare
<function_calls>tag in prose starts buffering when recovery is enabled.Known limitation: pending buffered text and unreleased recovered calls are deliberately discarded on stream error or cancellation. The Task consumer fetches the next chunk before processing the current one, so flushing only in the provider before throwing would still lose pending text. It could also move a first chunk error onto the midstream retry path or release a native call ahead of the error. Changing this behavior requires separately scoped consumer work.
In a6ea398,
preserves a narrated block and later text with line ending %jcovers both trailing newline variants, asserting exact full text and zero calls; its obsolete cap name was replaced. Focused tests also pin ordinary stream errors preserving the same error while discarding pending text, cancellation becoming the branded cancellation error, and a native call being yielded before a later failure.Validation at this head: 340 provider and transform tests pass, the seeded split fuzz passes at scale 3, lint and TypeScript checks pass, and independent review passed. These results do not replace the historical mutation measurements above with a new mutation result.