MCP server: One MCP server.MCP server: One MCP server.
Schema Sieve
@mrfentmenMCP server · External
Local JSON Schema structure inspection and privacy-safe fixture planning. Tools include inspect...
Freeno charge per call
Runs on your machine from its package; the steps are below.
What it does
- Reads
- Writes
- High impact
At most: only reads or looks up information.
What it costs
FreeOdel charges nothing per call. The publisher may charge for its own service.
Runs locally over stdio
This server isn't hosted — your MCP client launches it from a package registry. Use one of the commands below, or drop the config into your client (e.g. Claude Desktop).
npmschema-sieve-mcpv1.0.0
Run
npx -y schema-sieve-mcp
MCP client config
{
"mcpServers": {
"schema-sieve": {
"command": "npx",
"args": [
"-y",
"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
bash
npm install
npm run build
node dist/index.js
