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feat(qwen): Alibaba Qwen built-in over Model Studio's OpenAI-compatible mode
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Adds the `qwen` built-in provider and the `qwen://` DSN scheme, keyed by
QWEN_API_KEY and defaulting to Model Studio's international host. Like kimi
(ADR-0026) it is `provider/openai` pointed elsewhere — no new client.

Model Studio serves the same models over two protocols, so the real decision
was which wire format to speak. ADR-0027 records why it is the OpenAI one:
down the anthropic client `ReasoningEffort` is ignored by design, structured
output rides the first-party `output_config.format` mechanism the shim does
not implement, and cached-token accounting reads Anthropic-only usage fields.
Each of those fails silently rather than loudly, which is what makes the
choice worth writing down. The shim stays reachable ad hoc via an
`anthropic://` DSN.

The kimi and qwen DSN factories were byte-identical, so they now share one
`openaiCompatScheme` helper: the "credential comes from the DSN token, and
the missing-key hint names LLM_<NAME>" rules hold by construction instead of
by copy.

Tests are hermetic and break-checked (all six fail on a deliberate mutation),
including the reverse credential leak — a visible QWEN_API_KEY must not
authenticate the openai built-in — and reasoning_effort asserted on the wire
body, which is the ADR's load-bearing claim.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
This commit is contained in:
steve
2026-08-12 16:07:41 -04:00
co-authored by Claude Opus 5
parent 1bbbdaa1e5
commit 02cd561eaf
8 changed files with 461 additions and 20 deletions
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docs/adr/README.md
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@@ -30,3 +30,4 @@ One decision per file, append-only; supersede rather than rewrite.
| [0024](0024-audio-wave3-surfaces.md) | Wave-3 audio surfaces (stems, SFX, speech enhance, voice clone, translate) | Accepted |
| [0025](0025-videogen-wave3-surfaces.md) | Wave-3 video surfaces (lipsync, video matte, video upscale, chain jobs) | Accepted |
| [0026](0026-kimi-builtin.md) | Kimi (Moonshot AI) built-in provider — reuse openai client, KIMI_API_KEY | Accepted |
| [0027](0027-qwen-builtin.md) | Qwen (Alibaba) built-in provider — OpenAI-compat, not Model Studio's Anthropic-compat endpoint | Accepted |