Koskamo

JSON Contracts MCP

A local MCP server that provides Git-controlled JSON contracts, rules, examples, and JSON Schema validation tools. It enables agents to reliably convert natural-language requests into schema-valid JSON by acting as a contract registry and validator, without calling LLM providers or generating JSON itself.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

JSON Contracts MCP logo, by json-contractsCommunity listingLocal stdioSource reviewed; not executedPublished by json-contracts
You need:npm install -g json-contracts
Vendor documentation

Checks and signals

Each line is separate evidence, not a trust score.

  • Popularity 1 GitHub star

What you can do with it

  • List available JSON contracts
  • Return schemas, rules, and examples
  • Validate agent-produced JSON
  • Return repair contracts when validation fails

Source and maintenance

Community listingRegistry 0.1.2
mcp-registry: io.github.json-contracts/json-contracts@0.1.2Source repositoryProject website
Last repository push
Latest release
v0.1.2
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

json-contracts 0.1.2

npm
json-contracts package definition
{
  "version": "0.1.2",
  "transport": "stdio",
  "identifier": "json-contracts",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org",
  "environmentVariables": [
    {
      "name": "JSON_CONTRACTS_DIR",
      "format": "filepath",
      "description": "Folder containing JSON contract files. Defaults to ./json-contracts."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · repository · passed · metadata changed · updated
  • · backfill · recorded · Pre-expansion baseline; unobserved rich metadata remains unknown

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "json-contracts-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "json-contracts@0.1.2"
      ],
      "env": {
        "JSON_CONTRACTS_DIR": "<YOUR_JSON_CONTRACTS_DIR>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "json-contracts-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "json-contracts@0.1.2"
      ],
      "env": {
        "JSON_CONTRACTS_DIR": "<YOUR_JSON_CONTRACTS_DIR>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "json-contracts-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "json-contracts@0.1.2"
      ],
      "env": {
        "JSON_CONTRACTS_DIR": "<YOUR_JSON_CONTRACTS_DIR>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "json-contracts-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "json-contracts@0.1.2"
      ],
      "env": {
        "JSON_CONTRACTS_DIR": "<YOUR_JSON_CONTRACTS_DIR>"
      }
    }
  }
}

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