[SEP-2356] File input support for tools and elicitation#2217
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[SEP-2356] File input support for tools and elicitation#2217
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Implements declarative file input metadata so servers can tell clients which tool arguments / elicitation form fields should receive a native file picker. - FileInputDescriptor: Pydantic model with accept (MIME patterns) and max_size (bytes) - FileInputsCapability: client capability gate - Tool.input_files: maps arg names to FileInputDescriptor - ElicitRequestFormParams.requested_files: symmetric for elicitation - StringArraySchema: new PrimitiveSchemaDefinition member for multi-file fields All models use alias_generator=to_camel for snake_case ↔ camelCase on the wire. Files are transmitted as RFC 2397 data URIs: data:<mediatype>;name=<filename>;base64,<data> https://claude.ai/code/session_01JxhHWiXrXgE4JWC27dznRN
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Summary
Prototype implementation of the file input SEP for the Python SDK. Adds Pydantic models for declarative file inputs on tools and elicitation forms, gated by a new
fileInputsclient capability.SEP: modelcontextprotocol/modelcontextprotocol#2356
Note
This is a draft prototype tracking the spec proposal. It will be updated as the SEP evolves and should not be merged until the spec PR lands.
Changes
FileInputsCapability— empty capability class (matchesFormElicitationCapabilitypattern); wired intoClientCapabilities.file_inputsFileInputDescriptor—accept: list[str] | None,max_size: int | NoneTool.input_files: dict[str, FileInputDescriptor] | NoneElicitRequestFormParams.requested_files: dict[str, FileInputDescriptor] | NoneStringArraySchemais intentionally omitted — the Python SDK modelsElicitRequestedSchemaasdict[str, Any]and does not enumerate primitive schema variants.