v1.22.0

[Core]
- Make LlmAgent.model optional with a default fallback (b287215).
- Support regex for allowed origins (2ea6e51).
- Enable PROGRESSIVE_SSE_STREAMING feature by default (0b1cff2).
[Evals]
- Add custom instructions support to LlmBackedUserSimulator (a364388).
- Introduce a post-hoc, per-turn evaluator for user simulations (e515e0f).
[Tools]
- Expose mcps streamable http custom httpx factory parameter (bfed19c).
- Add a handwritten tool for Cloud Pub/Sub (b6f6dcb).
- Add token_endpoint_auth_method support to OAuth2 credentials (8782a69).
[Services]
- Introduce new JSON-based database schema for DatabaseSessionService, which will be used for newly-created databases. A migration command and script are provided.(7e6ef71 ba91fea ce64787).
- Set log level when deploying to Agent Engine (1f546df).
[A2A]
- Update event_converter used in A2ARemote agent to use a2a_task.status.message only if parts are non-empty (e4ee9d7).

Add checks for event content and parts before accessing (5912835).
Validate app name in adk create command (742c926).
Prevent .env files from overriding existing environment variables (0827d12).
Prevent ContextFilterPlugin from creating orphaned function responses (e32f017).
Update empty event check to include executable code and execution results (688f48f).
Make the BigQuery analytics plugin work with agents that don't have instructions such as the LoopAgent (8bed01c).
Label response as thought if task is immediately returned as working (4f3b733).

Remove unnecessary event loop creation in LiveRequstQueue constructor (ecc9f18).
Close database engines to avoid aiosqlite pytest hangs (4ddb2cb).
Add override_feature_enabled to override the default feature enable states (a088506).
Move SQLite migration script to migration/ folder (e8ab7da).
Update latest Live Model names for sample agent (f1eb1c0).
Update google-genai and google-cloud-aiplatform versions (d58ea58).
Introduce MetricInfoProvider interface, and refactor metric evaluators to use this interface to provide MetricInfo (5b7c8c0).

[Core]
- Make LlmAgent.model optional with a default fallback (b287215).
- Support regex for allowed origins (2ea6e51).
- Enable PROGRESSIVE_SSE_STREAMING feature by default (0b1cff2).
[Evals]
- Add custom instructions support to LlmBackedUserSimulator (a364388).
- Introduce a post-hoc, per-turn evaluator for user simulations (e515e0f).
[Tools]
- Expose mcps streamable http custom httpx factory parameter (bfed19c).
- Add a handwritten tool for Cloud Pub/Sub (b6f6dcb).
- Add token_endpoint_auth_method support to OAuth2 credentials (8782a69).
[Services]
- Introduce new JSON-based database schema for DatabaseSessionService, which will be used for newly-created databases. A migration command and script are provided.(7e6ef71 ba91fea ce64787).
- Set log level when deploying to Agent Engine (1f546df).
[A2A]
- Update event_converter used in A2ARemote agent to use a2a_task.status.message only if parts are non-empty (e4ee9d7).

Add checks for event content and parts before accessing (5912835).
Validate app name in adk create command (742c926).
Prevent .env files from overriding existing environment variables (0827d12).
Prevent ContextFilterPlugin from creating orphaned function responses (e32f017).
Update empty event check to include executable code and execution results (688f48f).
Make the BigQuery analytics plugin work with agents that don't have instructions such as the LoopAgent (8bed01c).
Label response as thought if task is immediately returned as working (4f3b733).

Remove unnecessary event loop creation in LiveRequstQueue constructor (ecc9f18).
Close database engines to avoid aiosqlite pytest hangs (4ddb2cb).
Add override_feature_enabled to override the default feature enable states (a088506).
Move SQLite migration script to migration/ folder (e8ab7da).
Update latest Live Model names for sample agent (f1eb1c0).
Update google-genai and google-cloud-aiplatform versions (d58ea58).
Introduce MetricInfoProvider interface, and refactor metric evaluators to use this interface to provide MetricInfo (5b7c8c0).

adk-python