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fix(mcp): inline tool schemas so inputSchema is type:object #121

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Merged
I-am-nothing merged 1 commit into from
Jun 15, 2026
Merged

fix(mcp): inline tool schemas so inputSchema is type:object #121

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7 changes: 6 additions & 1 deletion internal/core/mcp.go
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Original file line number Diff line number Diff line change
Expand Up @@ -104,7 +104,12 @@ func MCPResource[Out any](name, description string, handler func(ctx context.Con

func deriveSchema[T any]() (json.RawMessage, error) {
var zero T
return json.Marshal(jsonschema.Reflect(zero))
// DoNotReference inlines the struct schema so the top level is a concrete
// {"type":"object",...} rather than invopop's default {"$ref":"#/$defs/..."}.
// The MCP spec requires inputSchema/outputSchema to be an object schema with
// type:"object"; a top-level $ref makes clients reject the whole tools/list.
r := &jsonschema.Reflector{DoNotReference: true}
return json.Marshal(r.Reflect(zero))
}

// wrapMCPToolHandler adapts a typed handler into the type-erased registry form.
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