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Tools2026-09-16 · source-backed
PR #3510 detects blocking calls originating from the mcp and mcp_types packages during tests, exempting coverage internals, jsonschema lazy imports and synchronous media conversion, and moves Windows executable resolution off the event loop. Async MCP servers built on this SDK now get a test-time tripwire for the class of stall that only shows up under concurrent tool calls.
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A standalone macOS and Windows desktop beta released September 14, moving the open-source agent out of the VS Code extension slot; the releases page shows Desktop v0.0.26 on September 11, v0.0.27 on September 13 and v0.0.28 on September 15, so it's shipping daily (GitHub). It...
v1.6.0 adds a beta compaction parameter with signed compaction blocks, auto-mode tool permissions for Managed Agents, url_sources on web fetch, and async credential token providers. Reliability: it now honors Retry-After above 60 seconds, ignores invalid values, validates maxR...
Cline 0.0.23 fixed one wedged MCP server blocking the rest from shutting down and leaking their processes. Copilot CLI 1.0.83-5 fixed MCP tools becoming uncallable after a server restart, and 1.0.83-4 fixed agent-configured servers disappearing after built-in sub-agent turns....
Released August 31 after five betas, five weeks, 23 contributors and 80+ PRs, built on the MCP 2026-07-28 revision and the rewritten Python SDK v2 (GitHub). Modern requests are sessionless and self-contained, so protocol version is negotiated per connection and horizontal scal...
Agent-created schedules move from per-chat folders to ~/.cline/schedules, and cron reconciliation on restart no longer wipes hub-managed schedules (GitHub). Tool results returning images from browser or MCP tools render inline with a carousel instead of raw base64 text, which...
If you wrote an MCP server before July, it's on a protocol shape the maintainers have already removed. Not deprecated-with-a-migration-window. Removed from the spec. MCP lead maintainers David Soria Parra and Den Delimarsky published an updated roadmap on August 22, and the re...
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