Changelog

New Features

Stateless MCP serving. MCPConfig(stateless=True) serves /mcp without session tracking, so any replica can answer any request and a multi-instance deployment needs no session affinity. Costs server-initiated notifications and SSE resumability, so it stays off by default. See cookbook.
MCPTools(protocol_mode=...) selects which MCP protocol era to negotiate. Defaults to "legacy", preserving today's session-based behaviour; "auto" negotiates the newest era both sides support (sessionless from 2026-07-28). Existing servers are unaffected — a modern server still accepts the legacy handshake. Internally, MCP clients are now built on fastmcp.Client. See cookbook.
AgentOS MCP Server Card at GET /mcp/server-card, listing the served tools and carrying a configurable name, version and instructions.
.zip and .eml file uploads in AgentOS. See cookbook.
AuthorizationConfig.excluded_route_paths marks custom routes public without disabling auth globally.
Bedrock: pass your own async client to the model or embedder.

Anthropic: replay assistant turns verbatim so thinking blocks are no longer rejected.
Gemini: resolve image MIME type instead of hard-coding image/jpeg.
RecursiveChunking: stop emitting duplicate trailing chunks.
AG-UI: send wire fields instead of RunContext to remote entities.
AG-UI: expose streamed run errors.
Pin tree-sitter-language-pack<1.16 to unblock the chonkie code chunker.

[fix] Resolve Gemini image MIME type instead of hard-coding image/jpeg by @BlueX888 in #9887
fix: pin tree-sitter-language-pack<1.16 to unblock chonkie code chunker by @Himanshu040604 in #9901
feat: migrate MCP client and AgentOS server to mcp 2.x by @ProgrammerPlus1998 in #9269
[fix] expose streamed AG-UI run errors by @uuzzrm in #9487
feat: Support provided bedrock async client by @ddellspe-vl in #9531
fix: send wire fields instead of RunContext to remote entities over AG-UI by @Himanshu040604 in #9909
cookbook: add gemini-3.8-flash examples by @kausmeows in #9916
fix: stop RecursiveChunking from emitting duplicate trailing chunks by @devYRPauli in #9919
feat: name, version and instructions for the AgentOS MCP server by @ashpreetbedi in #9930
fix: replay Anthropic assistant turns verbatim so thinking blocks are not rejected by @ysolanky in #9924
feat: MCP Server Card at /mcp/server-card by @ashpreetbedi in #9932
feat: list the served tools on the MCP Server Card by @sannya-singal in #9949
feat: add AuthorizationConfig.excluded_route_paths for custom public routes by @kinKingen in #9295
feat: support .zip and .eml file uploads in AgentOS by @luisnmartins in #9193
chore: make AGENTS.md a symlink to CLAUDE.md by @ysolanky in #9813
feat: add stateless MCP transport and build MCP clients on fastmcp.Client by @sannya-singal in #9927
chore: Release v3.0.6 by @sannya-singal in #9907

Full Changelog: v3.0.5...v3.0.6