[SEP-2356] File input support for tools and elicitation#1633
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[SEP-2356] File input support for tools and elicitation#1633
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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.
types.ts (Zod schemas):
- FileInputDescriptorSchema: { accept?: string[], maxSize?: number (int) }
- ToolSchema.inputFiles: z.record(string, FileInputDescriptor)
- ClientCapabilitiesSchema.fileInputs: capability gate
- StringArraySchemaSchema: new PrimitiveSchemaDefinition union member
- ElicitRequestFormParamsSchema.requestedFiles: symmetric for elicitation
spec.types.ts: matching TypeScript interfaces (surgical edits, pinned-commit conventions)
spec.types.test.ts: mutual-assignability checks + bumped type count 145→147
types.test.ts: 10 new validation tests for SEP types
Files are transmitted as RFC 2397 data URIs: data:<mediatype>;name=<filename>;base64,<data>
https://claude.ai/code/session_01JxhHWiXrXgE4JWC27dznRN
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@modelcontextprotocol/client
@modelcontextprotocol/server
@modelcontextprotocol/express
@modelcontextprotocol/hono
@modelcontextprotocol/node
commit: |
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Summary
Prototype implementation of the file input SEP for the TypeScript SDK. Adds types and runtime schemas 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
spec.types.ts— mirrors the spec additions:ClientCapabilities.fileInputs?: objectTool.inputFiles?: { [argName: string]: FileInputDescriptor }ElicitRequestFormParams.requestedFiles?: { [fieldName: string]: FileInputDescriptor }FileInputDescriptorinterface (accept?: string[],maxSize?: number)StringArraySchemaadded toPrimitiveSchemaDefinitionuniontypes.ts— corresponding Zod runtime schemas (FileInputDescriptorSchema,StringArraySchemaSchema, field additions onToolSchema,ElicitRequestFormParamsSchema,ClientCapabilitiesSchema)