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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.265 ·

New MCP-manifest publish failure reasons: opaque_mcp_server_id and unknown_mcp_tool

Artifact publish telemetry gains two new MCP failure reasons: opaque_mcp_server_id and unknown_mcp_tool

TierUnder the hoodhow much it should matter to you
Useful1my rating, 1 to 5
Signal1worth watching, 1 to 5
AreaArtifactswhat it touches
KindInternal Changesin v2.1.265,
Under the hood

Artifact publish telemetry gains two new MCP failure reasons: opaque_mcp_server_id and unknown_mcp_tool

What

When artifact publishing checks an MCP (Model Context Protocol) server manifest and fails, it now records two additional, more specific failure reasons alongside the existing ones like host_server_unavailable and unresolved_mcp_server:

  • opaque_mcp_server_id
  • unknown_mcp_tool
Why

More specific failure reasons make it easier to tell exactly why an artifact's MCP manifest was rejected, building on earlier additions to this same validation chain such as the first-party server name collision check.

See this entry in the whole of v2.1.265 →

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