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MCPToolset now extends AsyncToolset and gains an `async_mode=True` flag. When set, MCP tools are built with an `AsyncRunContext` parameter that forwards MCP progress notifications via `ctx.update`, so the agent can narrate progress while a slow MCP tool runs in the background instead of blocking the reply loop. `AsyncToolset` no longer stores `get_running_tasks` / `cancel_task` in `_tools`; they're exposed through a `tools` property override that subclasses can condition. `MCPToolset` overrides it to expose the helpers only when `async_mode=True`, so the legacy MCP UX is unchanged when the flag is off. `MCPServer.list_tools` now caches per `async_mode`, and the example MCP server gains a long-running `book_flight` tool that emits progress updates.
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Co-authored-by: devin-ai-integration[bot] <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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Summary
MCPToolsetnow extendsAsyncToolsetand gains a keyword-onlyasync_modeflag. When enabled, MCP tools are built with anAsyncRunContextparameter and the MCP server's progress notifications are forwarded viactx.update, so the agent can narrate progress while a slow MCP tool runs in the background.Example
examples/voice_agents/mcp/server.pynow ships a fastget_weather(sync, no progress) and a long-runningbook_flightthat emitsctx.report_progressupdates over ~70s.mcp-agent.pyusesasync_mode=Trueand bumpsclient_session_timeout_seconds=120since the per-request timeout otherwise fires beforebook_flightreturns.