feat(#3996): guard image-output requests across Google surfaces - #4020
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Request TEXT+IMAGE on supported Google surfaces when an explicit override or models.dev enables image output. Before ordinary dispatch, reject custom function tools and structured output while allowing server-side built-ins. Title generation and compaction omit image response modalities and bypass the guard; omission does not explicitly force a TEXT modality. Use catalogue tool_call metadata to distinguish unsupported tools from an image-output combination conflict. Keep unknown support conservative and make the diagnostic accurate for either override or catalogue resolution. Remove dead ToolConfig when no custom tools remain and keep the TUI inline error visible without a misleading footer toast. Cover provider, runtime, and TUI paths, explicit false, unknown support and no-dispatch failures.
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What and why
Request TEXT+IMAGE for eligible ordinary Google calls through the Docker models gateway, direct Gemini API, and Vertex. Reject custom function tools and structured output before dispatch; allow Google Search, Maps, and code-execution built-ins. Title generation and compaction bypass the guard and omit image response modalities. Utility behavior is unchanged. Vertex coverage is deterministic guard/predicate coverage; live Vertex validation remains deferred.
Part of #3996. Review this PR against its immediate parent, #4019, rather than the aggregate stack against
main.Commit inventory
Head:
ac6390e97f8c0f8cb20f890ac59e555dccdcc0d2; parent SHA:51559ff510bf01ea053e3923c329c80ba724dca5.ac6390e97f8c0f8cb20f890ac59e555dccdcc0d2— feat(Epic: Gemini image output with workspace deliverables and portable session copies #3996): reject incompatible image-output Google requestsValidation
Build, test compilation, owning-package tests and the named fixture passed at this PR head.
Exact deterministic fixture command:
Matched top-level tests:
pkg/model/provider/gemini: 7.Deterministic scope: the named local fixture exercises this PR boundary with disposable configuration/stores and fake or loopback providers as applicable. Every listed package ran nonzero matching top-level tests.
Deferred/live scope: No direct/gateway live reproduction was rerun; live Vertex remains deferred. The final stack head passed build, lint, full tests, an uncached full suite, focused race tests and documentation checks in disposable environments. Remote CI is tracked by the checks below; no new paid-provider or active-database validation was run.