{"version":"2.1.304","anchor":"mcp-first-party-servers-file-upload-switch-and-uploads-off","canonical_anchor":"mcp-first-party-servers-file-upload-switch-and-uploads-off","heading":"File uploads can be switched off for individual first-party MCP servers","tier":"internal","area":"MCP","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.304\/e\/mcp-first-party-servers-file-upload-switch-and-uploads-off","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.304","markdown":"### File uploads can be switched off for individual first-party MCP servers\n\nClaude Code can now block file uploads to a specific first-party MCP server and gives the reason uploads_off when it does\n\n**Unclear.** It is not clear which servers use this switch or whether any feature you can reach relies on it yet.\n\n**What**\n\nMCP 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.\n\nWhen 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.\n\n**Why**\n\nFile 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.\n\n- Area: MCP\n- Tier: Under the hood\n- Useful: 2\/5\n- Signal: 3\/5\n- Scope: individual\n- Heads-up: no"}