schema-sieve-mcp

schema-sieve-mcp

Schema Sieve is a local MCP tool for understanding JSON Schema files while planning tests. It focuses on the part that usually takes the most time: finding required paths, nested constraints, unions, arrays, and likely sensitive fields before writing fixtures.

Tools

• inspect_schema: summarize types, properties, required fields, constraints, composition, and references.
• plan_fixture: produce placeholder paths such as <string>, <integer>, and <string:date-time> without inventing or copying test data.

Safety

• Only local JSON files are accepted.
• Paths are bounded by SCHEMA_SIEVE_ROOT, which defaults to the workspace parent when launched from the package.
• Files are capped at 2 MB and results are bounded.
• Examples, defaults, constants, and sensitive-like property names are omitted or marked as omitted.
• This is structural guidance, not a JSON Schema validator and not a security scanner.

Run

npm install
npm run build
node dist/index.js