Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.273,
Internal ChangesSection of the release
What
A new block of guidance text instructs Claude on how to handle connector (MCP) tools when publishing something like a Claude Doc or Artifact page:
Take argument names for a loaded connector tool from the tool's own input schema, not from guesswork.
Only learn a tool's result shape by making a safe, real call to it, never by inferring it from a write call.
Use describeTool(server, tool) when the published page needs to read a tool's schema at view time, since the authoring session cannot see that information before publishing.
Disclose to the user, rather than embedding in the page itself, whenever a tool's shape had to be guessed.
Why
This reduces the chance of a published page calling a connector tool with wrong argument names or misinterpreting its results, since the model is directed to verify tool shapes safely instead of guessing.
