File Uploads Charter changedcommunity/working-groups/file-uploads
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Upstream edited this page at 11 Nov 2026 01:57 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 11 Nov 2026 02:07 UTC.
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2929* **Reference Implementations**: SDK types and helpers for `FileInputDescriptor`, data URI encoding,
3030 and a sample host flow demonstrating picker invocation and value substitution.
3131* **Cross-Cutting Concerns**: Coordination with the MCP Apps WG where embedded UI surfaces present
32 their own file pickers, and with the Security WG on host-side validation requirements.
32 their own file pickers, and with the Security IG on host-side validation requirements.
3333* **Documentation**: Specification sections covering file input declaration and a migration guide
3434 for servers currently using ad-hoc base64 instructions.
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4747* **MCP Apps WG** — embedded app UIs may surface their own file pickers; the descriptor format
4848 should be reusable in that context.
49* **Security WG** — host-side validation requirements for user-supplied file content (the SEP
49* **[Security IG](https://modelcontextprotocol.io/community/interest-groups/security.md)** — host-side validation requirements for user-supplied file content (the SEP
5050 references [OWASP ASVS V5](https://owasp.org/projects/asvs)
5151 for general upload hygiene).
5252* **Tool Annotations IG** — file input descriptors are a form of input-parameter metadata and should
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