Backport: feat(provider/google-vertex): allow overriding Vertex Anthropic auth token generation#14869
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gr2m merged 1 commit intorelease-v5.0from Apr 30, 2026
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…token generation Backport of #14857 to release-v5.0. Adds an optional `generateAuthToken` setting to `createVertexAnthropic` (both edge and node variants). When provided, the SDK calls this function instead of performing the default OAuth exchange. Default behavior is unchanged. Useful for tests, custom auth providers, and proxy/relay scenarios where the caller supplies the auth token directly.
gr2m
approved these changes
Apr 30, 2026
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Backport of #14857 to `release-v5.0`.
The v6 backport (#14861) is already merged. This brings the same change to v5 so the option is available across all live branches the AI Gateway depends on.
Change
Adds optional `generateAuthToken` setting on `createVertexAnthropic` (edge + node). When provided, the SDK uses it instead of the default OAuth exchange. Default behavior unchanged.
```ts
createVertexAnthropic({
project: '...',
location: '...',
generateAuthToken: async () => myCustomToken(),
});
```
Tests
29 tests across edge + node, including merge order, fresh-call semantics, error propagation, user-header override, and (node-only) null return.
Risk
Purely additive. No breaking changes.