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JSON Contracts

Indexed by io.github.json-contracts
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About

JSON contract registry and validator for structured LLM and agent outputs.

Use this server

Add it to your MCP client. The catalogue lists this config verbatim from its source — it does not run, download, or vouch for the server. Review the command before you run it.

Transportstdio (runs a local command)
Env varsJSON_CONTRACTS_DIR
Claude Code 
claude mcp add --env JSON_CONTRACTS_DIR= json-contracts -- npx json-contracts
Cursor

Add to Cursor

If the button doesn't open Cursor, use the JSON below — Cursor accepts the same mcpServers config.

VS Code 
code --add-mcp '{"name":"json-contracts","command":"npx","args":["json-contracts"],"env":{"JSON_CONTRACTS_DIR":""}}'
JSON 
{
  "mcpServers": {
    "json-contracts": {
      "command": "npx",
      "args": [
        "json-contracts"
      ],
      "env": {
        "JSON_CONTRACTS_DIR": ""
      }
    }
  }
}

Environment variables are listed by name only — fill in your own values. Entries never carry secrets.