google/adk-python v1.20.0 on GitHub

1.20.0 (2025-12-01)

[Core]
- Add enum constraint to agent_name for transfer_to_agent (4a42d0d)
- Add validation for unique sub-agent names (#3557) (2247a45)
- Support streaming function call arguments in progressive SSE streaming feature (786aaed)
[Models]
- Enable multi-provider support for Claude and LiteLLM (d29261a)
[Tools]
- Create APIRegistryToolset to add tools from Cloud API registry to agent (ec4ccd7)
- Add an option to disallow propagating runner plugins to AgentTool runner (777dba3)
[Web]
- Added an endpoint to list apps with details (b57fe5f)

Allow image parts in user messages for Anthropic Claude (5453b5b)
Mark the Content as non-empty if its first part contains text or inline_data or file_data or func call/response (631b583)
Fixes double response processing issue in base_llm_flow.py where, in Bidi-streaming (live) mode, the multi-agent structure causes duplicated responses after tool calling. (cf21ca3)
Fix out of bounds error in _run_async_impl (8fc6128)
Fix paths for public docs (cd54f48)
Ensure request bodies without explicit names are named 'body' (084c2de), closes #2213
Optimize Stale Agent with GraphQL and Search API to resolve 429 Quota errors (cb19d07)
Update AgentTool to use Agent's description when input_schema is provided in FunctionDeclaration (52674e7)
Update LiteLLM system instruction role from "developer" to "system" (2e1f730), closes #3657
Update session last update time when appending events (a3e4ad3), closes #2721
Update the retry_on_closed_resource decorator to retry on all errors (a3aa077)
Windows Path Handling and Normalize Cross-Platform Path Resolution in AgentLoader (a1c09b7)