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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.235

The MCP open-a-URL prompt refuses URLs it cannot show exactly

You'll notice
Useful3 Signal2
MCP

If an MCP server's requested URL can't be shown in full, you can only decline it.

What

When an MCP server asks to open a URL, the confirmation dialog now renders it through a preview that reports whether the full URL can be displayed. If it cannot, Accept is not offered at all and Decline is the only choice.

Details
  • The explanatory line reads: "This URL cannot be shown exactly as it would open, so opening it is disabled. Decline to continue."
  • This blocks approving a link whose displayed form differs from what would actually open.
Evidence

This URL cannot be shown exactly as it would open, so opening it is disabled. Decline to continue.

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.235 →