Connect Claude Code to tools via MCP changedmcp
Nearest release: v2.1.288, published 6 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 3 Oct 2026 00:36 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 3 Oct 2026 00:37 UTC.
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13741374Servers can request input in two ways:
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13761376* **Form mode**: Claude Code shows a dialog with form fields defined by the server (for example, a username and password prompt). Fill in the fields and submit.
1377* **URL mode**: Claude Code asks whether to open a link in your browser and opens it when you accept. Servers use this mode for a flow that finishes outside the terminal, such as sign-in.
1377* **URL mode**: Claude Code asks whether to open a link in your browser. Servers use this mode for a flow that finishes outside the terminal, such as sign-in.
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13791379In URL mode, Claude Code passes the URL as a command-line argument to your system's URL handler, and caps how long that argument can be. When the URL, once escaped for the command line, is over that cap, you can only decline the request. Every character that needs escaping, such as `%` or `&`, counts four times toward the cap: its own character plus three escape characters. A URL with none of them reaches the cap at about 8,000 characters. A URL built largely of percent-escapes, where every third character is a `%`, reaches it at roughly 4,000.
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