Celia Chen c6049ebd96 Add capability overrides for custom model providers (#50459) ...

## What changed

Allow Responses-compatible providers to configure live web access and remote compaction under `model_providers.<id>.capabilities`:

```toml
[model_providers.custom.capabilities]
external_web_access = false
remote_compaction = "v2"
```

`external_web_access = false` keeps hosted web search from accessing the live web. `remote_compaction` accepts `v2` to send `compaction_trigger` items through the Responses endpoint, or `unsupported` to use local compaction. Omitted capabilities retain existing provider defaults.

## Testing

Add unit coverage for preserving unspecified defaults and a request-snapshot scenario verifying cached web search and V2 compaction for a custom provider.

GitOrigin-RevId: fbcc4870aa51c112af575d711679a3941d1e7878

2026-10-02 23:26:27 +00:00

..

src

Add capability overrides for custom model providers (#50459)

2026-10-02 23:26:27 +00:00

BUILD.bazel

feat: add opt-in provider runtime abstraction (#17713)

2026-04-17 02:27:45 +00:00

Cargo.toml

Use descriptor-safe helpers for executable test fixtures (#50018)

2026-10-01 15:57:03 +00:00