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Update: the current-main refinement is now complete on commit This is the DeepSeek V4-only continuation of the orphan-invoke recovery direction from #49117. The final patch additionally requires the configured Validation completed:
@chaunceyjiang @bbrowning, the PR is ready for review and a full CI signal when convenient. |
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@chaunceyjiang @bbrowning, #52645 is now marked Ready for Review on validated head |
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| @@ -181,6 +195,7 @@ def deepseek_v4_config(thinking: bool = False) -> ParserEngineConfig: | |||
| (ParserState.TOOL_ARGS, "INVOKE_END"): Transition( | |||
| ParserState.TOOL_BETWEEN, | |||
| (EventType.TOOL_CALL_END,), | |||
| commit_provisional_tool_call=True, | |||
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When a bare recovered invoke is followed by ordinary text without an outer TOOL_END, this commits the call while the transition leaves the engine in TOOL_BETWEEN. That state has no content event, so all trailing output is silently discarded until a closer or finish() is encountered; for example, prefix <invoke ...></invoke> suffix loses suffix. After committing a provisional call, restore a state that can emit subsequent text or otherwise preserve that text while awaiting an optional outer closer.
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| transition_events = self._run_transition(transition, value, token_count) | ||
| self._recovery_hold_events.extend(transition_events) | ||
| events = self._recovery_hold_events | ||
| self._clear_recovery_hold() |
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When a malformed or missing outer wrapper contains multiple invokes, committing the first candidate clears the provisional hold but leaves the parser in TOOL_BETWEEN. A following INVOKE_PREFIX therefore takes the normal parallel-call transition and bypasses recovery_tool_name_validator, allowing an undeclared second tool to be emitted even though recovery is intended to be bounded to tools declared by the request. Keep subsequent orphan invokes provisional or validate each name before emitting it.
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| def test_recovered_invoke_preserves_trailing_content_without_tool_end(mock_request): |
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Move these regression cases into tests/parser/engine/test_deepseek_v4.py: this same commit already adds TestMalformedWrapperRecovery and its helpers there, so a nearby suite demonstrably fits and the separate file duplicates setup and fragments one recovery feature across two suites, contrary to the repository's test-placement requirement.
AGENTS.md reference: AGENTS.md:L87-L88
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| if self._recovery_hold_active and self.state == ParserState.TOOL_ARGS: | ||
| # DSML parameter closers are terminals but deliberately have | ||
| # no state transition. During recovery they are still part of | ||
| # the candidate invoke and must stay buffered as arguments. | ||
| return self._emit_for_state(value, token_count) |
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When a streamed provisional invoke has reached TOOL_ARGS but generation ends before INVOKE_END, an unconfigured special token such as EOS arrives as DROP_TERMINAL; this branch handles every transitionless terminal before the drop check below, appends the EOS text to _recovery_hold_raw, and finish() then returns it as ordinary content when aborting the candidate. Handle DROP_TERMINAL before this recovery fallback, or restrict the fallback to the intended parameter closer, so malformed/truncated calls do not leak normally suppressed special-token text to users.
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| (ParserState.REASONING, "INVOKE_PREFIX"): Transition( | ||
| ParserState.TOOL_NAME, | ||
| (EventType.REASONING_END, EventType.TOOL_CALL_START), | ||
| provisional_tool_call=True, |
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When thinking is enabled and a bare invoke appears before </think>, the serving-layer ParserEngineReasoningAdapter sets skip_tool_parsing=True; StreamingParserEngine._on_terminal then handles this new transition in its skip-tool branch before _apply_transition, so provisional_tool_call=True is never honored and reasoning ends immediately at the prefix. If the invoke is truncated, undeclared, or recovery is disabled by tool_choice="none", the tool adapter later returns the candidate as user-visible content instead of restoring it to reasoning as the provisional contract requires. The skip-tool path needs to defer this transition until the candidate is committed or rolled back.
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Addressed in 4f2aae22cd. Provisional transitions now bypass the generic skip-tool passthrough while the recovery hold is active. The reasoning-side parser is synchronized with the current request's tools/tool_choice, and only a completed validated candidate emits REASONING_END plus the raw invoke for tool-parser handoff. Undeclared, truncated, and tool_choice="none" candidates abort back to the original REASONING state. Added DelegatingParser regression coverage for the valid commit case and all three rollback cases.
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Follow-up head 4f2aae22cd addresses the reasoning-adapter provisional rollback finding. The new DelegatingParser regression cases cover a valid committed orphan invoke and rollback for undeclared, truncated, and tool_choice="none" candidates. Upstream pre-commit remains gated before code checks.
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Codex Review: Didn't find any major issues. Bravo. Reviewed commit: ℹ️ About Codex in GitHubYour team has set up Codex to review pull requests in this repo. Reviews are triggered when you
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Independent validation on a second affected stack built on bjk110/spark_vllm_docker (2× NVIDIA DGX Spark GB10, TP=2, DeepSeek-V4-Flash-0731, vLLM 0.27.1-based NGC 26.07 image, DSpark k=5 probabilistic) after hitting this failure family in production agentic chats. Repro pre-patch (client-independent, scripted multi-round transcripts): with a 2-tool preamble, DSML suffixes trickled into Porting note for 0.27.1-based builds: the PR touches files whose current- Validation on-stack:
Thank you — this is exactly the fix our stack needed. Happy to provide the repro script or further measurements. |
…llm-project#52645 through c848ab5aa4) Recover structurally valid <｜DSML｜invoke> blocks emitted with a missing or corrupted outer <｜DSML｜tool_calls> wrapper: validate the function name against tools declared by the current request, hold the provisional invoke until </｜DSML｜invoke>, and roll rejected candidates back to text unchanged. Addresses the agentic corruption cascade on deepseek-v4-flash-lws-b-0: a single leaked malformed wrapper feeds DSML back into agent context and sessions degrade into token soup (upstream vllm-project#51914, vllm-project#48089; independent 2xGB10 TP2 + DSpark k=5 validation in the PR thread). Ported through upstream c848ab5aa4 only. The final upstream commit 4f2aae22cd (reasoning-adapter delegation) is excluded: its own regression tests fail on pure upstream (verified on a clean worktree of 4f2aae22cd; upstream CI never ran - contributor-gated), caused by ParserEngine finish_streaming dropping _deferred_reasoning. Pre-</think> bare-invoke recovery therefore remains unsupported on the delegating path; post-</think> recovery - the corruption cascade - is fully covered. vllm/parser files byte-identical to c848ab5aa4. Tests: 79/79 tests/parser/engine/test_deepseek_v4.py, 3812/3812 tests/parser/engine. Co-authored-by: OMP Agent <agent@randomvariable.co.uk>
…c848) port Co-authored-by: OMP Agent <agent@randomvariable.co.uk>
…oject#52645) Port provisional invoke recovery onto this branch so missing or corrupted tool_calls wrappers still parse declared tools, including reasoning-phase rollback. Co-authored-by: Cursor Grok 4.6
Signed-off-by: jinbagi <4094424+jinbagi@users.noreply.github.com>
Assisted-by: OpenAI Codex Signed-off-by: jinbagi <4094424+jinbagi@users.noreply.github.com>
Assisted-by: OpenAI Codex Signed-off-by: jinbagi <4094424+jinbagi@users.noreply.github.com>
Assisted-by: OpenAI Codex Signed-off-by: jinbagi <4094424+jinbagi@users.noreply.github.com>
Assisted-by: OpenAI Codex Signed-off-by: jinbagi <4094424+jinbagi@users.noreply.github.com>
Keep V3.2 function_calls blocks in their original content or reasoning channel so nested declared invokes cannot enter the V4 recovery path. Preserve native wrappers after unclosed foreign blocks and flush deferred reasoning consistently at stream end. Co-authored-by: OpenAI Codex <codex@openai.com>
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Carried from upstream PR vllm-project#52645 (jinbagi) — needed for DeepSeek V4 serving; not yet merged upstream. Dropped on the first rebase after the PR merges. (cherry picked from commit 7ace3d6)
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Purpose
Fixes #51914.
DeepSeek V4 can intermittently emit an otherwise complete DSML
<｜DSML｜invoke ...>block while the outer<｜DSML｜tool_calls>opener is missing or malformed. One observedDeepSeek-V4-Flash-0731variant changestool_callstotoolcalls. The currentDeepSeekV4Parseronly enters the tool-call state machine fromCONTENTorREASONINGwhen the exact outer opener is recognized, so the invoke is otherwise returned as text and the structured tool call is lost.Relationship to #49117
This PR is a current-
main, DeepSeek V4-only refinement derived from the orphan-invoke recovery direction developed in #49117. It is not an unrelated competing implementation.</｜DSML｜invoke>transition.This narrower scope keeps the current-main patch to the parser engine and DeepSeek V4 parser tests.
Fix
<｜DSML｜invoke name="...">seen fromCONTENTorREASONINGas a provisional recovery candidate.INVOKE_ENDtransition.CONTENTso ordinary suffix text is preserved and any following bare invoke must pass provisional validation again.TOOL_ENDafter a recovered invoke.skip_tool_parsing=True; only a completed, validated invoke ends reasoning and is handed off to the tool parser.tool_choiceinto the reasoning-side parser engine before recovery validation, so undeclared tools andtool_choice="none"still roll back correctly.TOOL_ENDarrives withoutINVOKE_END, the request has no tools, usestool_choice="none", names an undeclared tool, or generation ends early, restore the full candidate to its original content or reasoning state.The patch deliberately does not normalize specific misspelled wrapper spellings. Recovery anchors on the inner invoke structure, so the same conservative path covers missing and malformed outer openers without expanding a typo allowlist.
Regression coverage
Recovery coverage is integrated into the existing
tests/parser/engine/test_deepseek_v4.pysuite:tool_callstotoolcallsopener from [Bug] DeepSeek-V4-Flash-0731 intermittently emits malformed DSML tool-call start wrapper on v0.27.1 + DSpark #51914tool_choice="none"</｜DSML｜invoke></｜DSML｜tool_calls>without a preceding invoke close</think>commits and is handed off to the tool parsertool_choice="none"bare invokes before a missing</think>remain reasoning instead of becoming user-visible contentValidation
Parser tests and changed-file checks were run on commit
94ceafb1e7before the follow-up review fixes:Follow-up commit
35af231a99addresses the suffix-preservation and parallel-name-validation review findings and adds focused regression cases to the existing DeepSeek V4 test suite. Commitc848ab5aa4addresses the subsequentDROP_TERMINALrollback finding and adds an EOS-leak regression case. Commit4f2aae22cdaddresses the reasoning-adapter rollback finding and adds serving-styleDelegatingParsercoverage for a valid committed invoke plus undeclared, truncated, andtool_choice="none"rollback cases.The follow-up commits have not yet received upstream code-check results. On the upstream PR, the
pre-commitworkflow stops at the repository contributor gate before code checks run: it requires averified,ready, orready-run-all-testslabel, or at least four merged PRs by the author. The actualpre-commitjob is therefore skipped until that gate is opened.Real-environment validation was also completed on the affected DeepSeek-V4-Flash-0731 plus DSpark serving stack for the original reported failure family. The original production prompt and tool payload remain private; validation used a sanitized equivalent and confirmed structured tool-call recovery in the affected serving path.
Scope and tradeoff
A fully formed DSML invoke using a real declared tool name is intentionally recoverable even if the outer wrapper is absent. Prose that reproduces an entire valid invoke for a declared tool is fundamentally ambiguous. Requiring a current-request tool match and a complete invoke bounds the recovery without broad regex repair.
Unknown malformed wrapper text emitted before the inner invoke is not guessed or retracted. The parser recovers the structured invoke while preserving text it cannot safely classify.
AI assistance
AI assistance was used to analyze the parser state machine, prepare the implementation, review the provisional-commit conditions, and write regression tests. The affected serving behavior was validated in the reporter's real environment, and the original parser tree was checked with the commands and results above.