* fix(mcp): sanitize for gemini when model is unresolved
isGeminiRouted() previously required the effective model string to
contain "gemini" — but when payload.model="auto" (or any unresolved
slug) reaches addTools(), `effective` is the literal "auto", which
doesn't match. opencode then auto-selects gemini *after* the MCP
server has registered raw arktype schemas, and every tool turn dies
on `function_declarations[*].properties[*].any_of[*].enum: only
allowed for STRING type`.
widen the gate: any unresolved specifier (undefined / "auto" / a
slug without a `provider/` prefix) is treated as gemini-routed and
sanitized. the transforms are universally compatible normalizations
so the false-positive cost is negligible. tighten case 3 to preserve
`description` so the only lossy path no longer drops operator-facing
context.
fixes#676.
* revert case-3 description preservation
per pullfrog review on #697: keeping `description` as a peer of
`anyOf`/`oneOf` directly contradicts the file's own header (lines
19-21) and the upstream opencode #14659 rationale that gates this
sanitizer — gemini requires anyOf to be the ONLY field on a schema
node, sibling keywords trigger
`anyOf must be the only field in a schema node`. the change was
speculative scope creep with no evidence, and would silently
re-introduce a different gemini failure for any future schema using
`.describe().or(...)`. the bug fix for #676 doesn't need it (arktype
doesn't emit non-collapsible anyOf for current tool schemas).
The previous sanitizer proxied `schema.toJsonSchema()`, but fastmcp 3.x uses
`xsschema.toJsonSchema()` which reads `schema["~standard"].jsonSchema.input(...)`
directly when the StandardJSONSchemaV1 extension is present (arktype 2.x).
Our proxy was never invoked, so the sanitizer was a silent no-op.
Proxy the entire `~standard` → `jsonSchema` → `input` chain so the transform
runs regardless of which path xsschema picks. Also add case 1 (add `type:"string"`
to enum-only schemas) — arktype 2.x emits `{enum:["A","B"]}` without a type
field, which is the exact form Gemini rejects with
"only allowed for STRING type".
Verified locally: wrapped schema now emits `{type:"string", enum:[...]}` and
drops `$schema`; validation still works.
Gemini's generateContent API rejects arktype's `{anyOf:[{enum:[...]}]}` string-enum
encoding, `$schema` metadata, and `anyOf` with sibling fields. Port the old
sanitizer back as an isolated module (action/mcp/geminiSanitizer.ts) and gate it
on `isGeminiRouted(ctx)` so non-gemini routes see the original schema. Wires
`resolvedModel` onto ToolContext so the sanitizer can see the upstream specifier.
Also bumps `openai/gpt-codex-mini` alias from the deprecated `codex-mini-latest`
to `gpt-5.1-codex-mini`, matching the openrouter resolve.
Adds a `filter` workflow_dispatch input + MATRIX_FILTER env that restricts the
models-live matrix to aliases matching a substring, so we can iterate on a
single provider (e.g. `filter=gemini`) without paying to run every model.
Colin McDonnell