Changelog

New features

Agent Skills: Introducing the Skills class, enabling you to extend your Agents’ capabilities by providing specific skills, as defined by Anthropic’s Agent Skill specification. See the docs.
Dynamic headers for MCP: You can now pass a header_provider function to your MCPTools instances to generate dynamic headers when calling MCP tools. This is useful for headers that need to change based on context e.g. authorization tokens or user ids. See the docs.

Reasoning models: enable native reasoning for the following reasoning models:
- OpenAI GPT-5.1 and 5.2 models
- New Gemini 3, 3.5 and deepthink model
- New DeepSeek r1 and reasoner models.
JWT Middleware Audience: Allow setting of the expected audience for checking
MCP transport default: The MCPTools class now defaults to StreamableHttp as transport when connecting to external MCP servers.
Postgres DB: Updates to the database session pooling logic and handling of illegal characters in any strings to store.0
A2A Remote Agents: Added support for a2a protocol when using remote agents. The also means Google ADK agents can be used with AgentOS as remote running agents. This feature is still in beta. See the docs.

Chunking: Fixed paragraph and newline splitting in chunking strategies.
Early Termination in Workflows: Propagate stop flag from primitive inner steps to workflow
Context compression for OpenAIResponses: Update our CompressionManager to work properly with any model using the OpenAIResponses API.

[fix] Added vllm to be included to remove unsupported fields by @mishramonalisha76 in #5848
[docs] Fix broken link to evals/performance in README by @ppippi-dev in #5854
fix: a typo in cookbook by @crazyss in #5875
fix: propagate stop flag from primitive inner steps to workflow by @pengwk in #5868
fix: Split text before clean_text [SDK-411] by @harshsinha03 in #5900
[feat] Add the audience parameter to the JWTMiddleware constructor by @poneding in #5685
feat: consider new reasoning models by @manuhortet in #5910
feat: default to streamable-http transport in MCPTools if url is present by @manuhortet in #5903
fix: Various Postgres fixes by @dirkbrnd in #5851
fix: handle Function type in CompressionManager, for OpenAIResponses by @manuhortet in #5870
feat: add A2AClient and cookbooks by @uzaxirr in #5614
feat: dynamic headers for MCP tools by @bhatt-neel-dev in #5655
feat: add skills system with local loader and agent integration by @uzaxirr in #5890
fix: rm redndant cookbook by @uzaxirr in #5918
chore: v2.3.22 by @manuhortet in #5914

Full Changelog: v2.3.21...v2.3.22