Same class of finding as round 1, one level in: I factored the DSN-scheme half
of the kimi/qwen duplication into openaiCompatScheme and left the eager
provider half copy-pasted, so a third built-in still had six lines to clone —
including both credential rules, which is exactly the pair you do not want
re-typed.
registerOpenAICompatBuiltin now installs both halves from one call. The rules
that matter hold by construction for every future caller: WithAPIKey passed
unconditionally (an unset key must not fall through to OPENAI_API_KEY), and
WithAPIKeyName naming that same variable in the 401 hint. Registering kimi and
qwen is now one line each.
Also fixed a cross-reference the ADR got wrong: Qwen's image-input caveat is
README matrix footnote ⁴, not ³ — ³ is kimi's. I wrote "³, shared with kimi"
in the ADR and then gave Qwen its own footnote in the README.
The break-check harness needed fixing before any of this could be trusted:
three of its mutations targeted lines this refactor moved, so they matched
nothing, the code was never broken, and the suite reported "test still passed"
— identical output to a test that genuinely misses the bug. Mutations are now
verified to have landed (sha before/after) and the suite fails loudly if one
doesn't. Two new cases cover the helper: dropping the unconditional WithAPIKey,
and dropping the scheme-half registration. 8/8 apply and are caught.
Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
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]>