feat: attribute requests to a user profile - #33
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dtmeadows-ant
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Sep 9, 2026
sophie-ant
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September 9, 2026 17:36
The base branch was changed.
Lets an app attribute each request to one of its users. Set
`userProfileID:` on `ClaudeLanguageModel`, and every request sends the
`anthropic-user-profile-id` header, with the `user-profiles-2026-08-18`
beta that the header needs:
ClaudeLanguageModel(name: .opus5, auth: auth, userProfileID: profileID)
Until now `.apiKey` and `.appAttest` couldn't send the header at all,
and `.proxied` needed both headers set by hand.
- The executor sets the header and adds the beta to the list it already
merges, so the beta goes after any values the request already
carries, such as a proxy's or the fallbacks beta, and is never
repeated.
- The configured profile replaces a proxy header of the same name,
however it's spelled, so a request carries one profile.
- `HeaderName` names the `anthropic-beta` and
`anthropic-user-profile-id` headers.
- The ID isn't validated locally. The API checks it, and a malformed or
unknown ID fails the request.
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Summary
Lets an app attribute each request to one of its users. Set
userProfileID:onClaudeLanguageModel. Every request then sends theanthropic-user-profile-idheader, with theuser-profiles-2026-08-18beta that the header needs:Until now,
.apiKeyand.appAttestcouldn't send the header at all, and.proxiedneeded both headers set by hand. The other SDKs expose the same header as auser_profile_idrequest parameter.HeaderNamenames theanthropic-betaandanthropic-user-profile-idheaders./v1/user_profiles), which create profiles and enrollment URLs. Those belong on the developer's backend, not in an app.Rebased onto
mainafter #32 merged. It builds on that change: both add to the same executor configuration and test stub.Test plan
Live requests:
LanguageModelSessionwith a valid profile ID asuserProfileIDsucceeds, and the profile header and merged beta list reach the API as one comma-joinedanthropic-betavalue.Unit tests cover the header, the beta order, one profile header however a proxy spells it, and case-insensitive header merging.
The full test suite at f899ba8 (the same tree as 428dd51, before the rebase onto the merged #32), via
xcodebuildon macOS 26.6 with Xcode 27.0 beta 6 (27A5252f) and the iOS 27.0 simulator:** TEST SUCCEEDED **, 243 tests, 240 passed, 0 failed, 3 skipped. The 3 skips are the keychain-backedAppAttestStoreTests, which skip by design under this runner.