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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.304 ·

File uploads can be switched off for individual first-party MCP servers

Claude Code can now block file uploads to a specific first-party MCP server and gives the reason uploads_off when it does

Under the hood Internal Changes
JSON All of v2.1.304
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.304,
Internal ChangesSection of the release

Unclear It is not clear which servers use this switch or whether any feature you can reach relies on it yet.

What

MCP servers are outside programs that give Claude Code extra tools. First-party servers are the ones provided by Anthropic. Configurations that Claude Code manages for itself can now list such a server with an id and a setting that says whether file uploads to it are allowed.

When uploads are turned off for a server, Claude Code refuses the upload and gives the reason uploads_off. This check runs before any other policy checks.

Why

File uploads to a first-party MCP server can now be turned off one server at a time. If an upload is refused with uploads_off, that server's own settings blocked it, not a wider policy.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtIt is not clear which servers use this switch or whether any feature you can reach relies on it yet.

See this entry in the whole of v2.1.304 →

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