Add limited use tokens for ai logic

[AustinBenoit]

Description

Provide details of the change, and generalize the change in the PR title above.

Add limited use tokens for AI logic

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Testing

Describe how you've tested these changes.

Tested locally. Added to all the backends so we enforce appcheck for the

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Type of Change

Place an x the applicable box:

• Bug fix. Add the issue # below if applicable.
• New feature. A non-breaking change which adds functionality.
• Other, such as a build process or documentation change.

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[gemini-code-assist]

Code Review

This pull request introduces support for limited-use App Check tokens across the Firebase AI SDK by updating the FirebaseAI instance management and propagating the configuration to all generative and image models. The reviewer identified a critical issue where several calls to SetRequestHeaders use a new parameter that is not defined in the current scope, potentially leading to compilation failures. It is recommended to replace these calls with the updated AddFirebaseTokensAsync method for consistency and correctness.

[gemini-code-assist]

The HttpHelpers.SetRequestHeaders method is called with a new parameter that isn't defined in the provided changes for that class. Using FirebaseInterops.AddFirebaseTokensAsync is a viable alternative that is already updated in this PR to handle HttpRequestMessage objects.

      await Firebase.Internal.FirebaseInterops.AddFirebaseTokensAsync(request, _firebaseApp, limitedUseAppCheckTokens: _useLimitedUseAppCheckTokens);

[AustinBenoit]

This has been added in with functions

[github-actions]

❌  Integration test FAILED

Requested by @firebase-workflow-trigger[bot] on commit e7852d0
Last updated: Wed May 13 08:29 PDT 2026
View integration test log & download artifacts

Failures	Configs
missing_log	[TEST] [ERROR] [2021] [1/2 Build OS(s): windows] [1/5 Platform(s): Playmode] [1/2 Test Device(s): github_runner]
analytics	[TEST] [FAILURE] [2021] [1/2 Build OS(s): macos] [1/5 Platform(s): 14] [1/2 Test Device(s): iOS]
firebaseai	[BUILD] [ERROR] [2021] [All 2 Build OS(s)] [All 3 Platform(s)] [All 2 Test Device(s)]