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VS Code

JSON Contracts for VS Code

io.github.json-contracts/json-contracts

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

client:VS Code transport:stdio runtime:npm

Install JSON Contracts in VS Code

.vscode/mcp.json 

{
  "inputs": [
    {
      "type": "promptString",
      "id": "json-contracts-dir",
      "description": "JSON_CONTRACTS_DIR",
      "password": true
    }
  ],
  "servers": {
    "json-contracts": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "json-contracts"
      ],
      "env": {
        "JSON_CONTRACTS_DIR": "${input:json-contracts-dir}"
      }
    }
  }
}

VS Code prompts for each input the first time the server starts, so no secret is written to the file. VS Code docs

JSON Contracts in other clients

JSON Contracts MCP server