Koskamo

First CH Tools MCP

An open-source MCP server that exposes a wide range of web production tools to AI agents like Claude Code. It provides local utilities for WCAG contrast checking, Japanese character counting, WebP conversion, JSON-LD generation, and various data transformations (JSON/YAML, CSV/JSON, date calculations). It also includes tools that interact with the apps.first-ch.com API for site checks, SEO analysis, and security header verification.

Package and access

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

First CH Tools MCP logo, by First CHCommunity listingLocal stdioSource reviewed; not executedPublished by First CH
Vendor documentation

What you can do with it

  • Generate JSON-LD structured data and llms.txt files
  • Convert images to WebP format locally
  • Check WCAG color contrast ratios
  • Parse User-Agent strings for device detection

Source and maintenance

Community listingRegistry 0.42.1
mcp-registry: io.github.First-CH/tools-mcp@0.42.1Source repository
Maintenance checked

Packages and installation

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

@first-ch/tools-mcp 0.42.1

npm
@first-ch/tools-mcp package definition
{
  "version": "0.42.1",
  "transport": "stdio",
  "identifier": "@first-ch/tools-mcp",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "FIRSTCH_TOOLS_USAGE_LOG",
      "format": "string",
      "description": "Optional. Path to a local JSONL file for opt-in usage logging. No logging when unset."
    },
    {
      "name": "FIRSTCH_APPS_BASE_URL",
      "format": "string",
      "description": "Optional. Base URL for the app_* tools (default https://apps.first-ch.com). For testing only."
    },
    {
      "name": "MARP_CHROME_PATH",
      "format": "string",
      "description": "Optional. Path to a Chrome/Chromium executable used by marp_render for PDF output. Auto-detected on common paths when unset; PDF is skipped (HTML still returned) if none is found."
    }
  ]
}

Tools

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

No tool definitions available.

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": {
    "first-ch-tools-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@first-ch/tools-mcp@0.42.1"
      ],
      "env": {
        "FIRSTCH_TOOLS_USAGE_LOG": "<YOUR_FIRSTCH_TOOLS_USAGE_LOG>",
        "FIRSTCH_APPS_BASE_URL": "<YOUR_FIRSTCH_APPS_BASE_URL>",
        "MARP_CHROME_PATH": "<YOUR_MARP_CHROME_PATH>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "first-ch-tools-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@first-ch/tools-mcp@0.42.1"
      ],
      "env": {
        "FIRSTCH_TOOLS_USAGE_LOG": "<YOUR_FIRSTCH_TOOLS_USAGE_LOG>",
        "FIRSTCH_APPS_BASE_URL": "<YOUR_FIRSTCH_APPS_BASE_URL>",
        "MARP_CHROME_PATH": "<YOUR_MARP_CHROME_PATH>"
      }
    }
  }
}

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": {
    "first-ch-tools-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@first-ch/tools-mcp@0.42.1"
      ],
      "env": {
        "FIRSTCH_TOOLS_USAGE_LOG": "<YOUR_FIRSTCH_TOOLS_USAGE_LOG>",
        "FIRSTCH_APPS_BASE_URL": "<YOUR_FIRSTCH_APPS_BASE_URL>",
        "MARP_CHROME_PATH": "<YOUR_MARP_CHROME_PATH>"
      }
    }
  }
}

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": {
    "first-ch-tools-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@first-ch/tools-mcp@0.42.1"
      ],
      "env": {
        "FIRSTCH_TOOLS_USAGE_LOG": "<YOUR_FIRSTCH_TOOLS_USAGE_LOG>",
        "FIRSTCH_APPS_BASE_URL": "<YOUR_FIRSTCH_APPS_BASE_URL>",
        "MARP_CHROME_PATH": "<YOUR_MARP_CHROME_PATH>"
      }
    }
  }
}

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