BBuf/vllm-qwen3-coder-optimization
skills/model-optimization/vllm/vllm-qwen3-coder-optimization/SKILL.md
PR-backed optimization manual for Qwen3 Coder in vLLM. Use when an engineer needs to audit, debug, extend, or document Qwen3 Coder tool parser, structured tool arguments, and coding-oriented parser behavior layered on top of the base Qwen3 runtime.
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SKILL.md
- name:
- vllm-qwen3-coder-optimization
- description:
- PR-backed optimization manual for Qwen3 Coder in vLLM. Use when an engineer needs to audit, debug, extend, or document Qwen3 Coder tool parser, structured tool arguments, and coding-oriented parser behavior layered on top of the base Qwen3 runtime.
vLLM Qwen3 Coder Optimization
Overview
This skill covers Qwen3 Coder tool parser, structured tool arguments, and coding-oriented parser behavior layered on top of the base Qwen3 runtime.
Evidence snapshot:
- vLLM mainline checked around
0f7be0f2f76814f80f9091220a5fbbb53912ad00 - Support status: supported on current mainline
- Family baseline: read
qwen3-corefirst; this dossier only records the delta forqwen3-coder. - Canonical PR notes:
references/pr-history.md - History mirrors:
model-pr-optimization-history/vllm/qwen3-coder/README.zh.mdandREADME.en.md
Non-Negotiable Evidence Rule
Use skills/model-optimization/model-pr-diff-dossier/SKILL.md as the production bar.
Every PR cited for this family must be based on diff reading, not only PR titles.
Runtime Surfaces
vllm/vllm/model_executor/models/qwen3.pyvllm/vllm/entrypoints/openai/tool_parsers/
Current Main Summary
- Qwen3 Coder inherits the base Qwen3 runtime and adds coder-specific tool parsing.
- The main regressions are in JSON-schema edge cases, anyOf / oneOf handling, and Responses API tools.
Key Landed PRs
- #21396
Add Qwen3CoderToolParser: Created the dedicated coder-tool parser instead of reusing a generic Qwen parser. - #36032
Fix anyOf double encoded parameters: Fixed a concrete schema serialization bug in coder tool calls. - #37831
Fix anyOf/oneOf type resolution for nullable params: Improved nullable parameter handling in complex schemas. - #38848
Fix Qwen3 tool parser for Responses API tools: Aligned the tool parser with the Responses API tool surface.
Open Optimization Items
- Re-run PR search before claiming new support beyond the checked mainline commit.
Validation Lanes
- Complex tool schema extraction with anyOf / oneOf / nullable parameters.
- Responses API tool execution on coder checkpoints.
- Streaming tool-call integrity under speculative decode.
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