IrishTaxHub MCP Server

Model Context Protocol (MCP) server that exposes IrishTaxHub API operations as tools.

This server now uses FastMCP v2 for a simpler, production-ready implementation.

Features

• Dynamic OpenAPI-powered tools only:

  • openapi_list_endpoints(tag?) → discover available endpoints

  • openapi_get_request_schema(path, method=POST) → JSON Schema for request body

  • openapi_invoke(path, method=POST, body?, params?) → validate and call dynamically

Related MCP server: OpenAPI MCP Server

Install

Use Poetry (recommended) or pip.

# With Poetry
poetry install

# Or with pip
pip install -e .

# If running directly with FastMCP CLI
pip install fastmcp

Configure

Set environment variables (or copy .env.example to .env):

For production use:

export IRISHTAXHUB_BASE_URL="https://prod.aws.irishtaxhub.ie"
export IRISHTAXHUB_TIMEOUT="30"
# OpenAPI source (file or URL). Defaults to "$IRISHTAXHUB_BASE_URL/apispec_1.json".
export IRISHTAXHUB_OPENAPI="https://prod.aws.irishtaxhub.ie/apispec_1.json"
export IRISHTAXHUB_DEVELOPMENT_MODE=false

For local development (if running the API locally):

export IRISHTAXHUB_BASE_URL="http://localhost:5000"
export IRISHTAXHUB_TIMEOUT="30"
export IRISHTAXHUB_OPENAPI="http://localhost:5000/openapi.json"
export IRISHTAXHUB_DEVELOPMENT_MODE=true

Run (local)

Standard I/O server (used by MCP clients):

python -m irishtaxhub_mcp.server
# or via Poetry
poetry run irishtaxhub-mcp

# or run with the FastMCP CLI (equivalent)
fastmcp run src/irishtaxhub_mcp/server.py

Use with Claude Desktop

Add an MCP server entry to your Claude Desktop config (replace path as needed):

For production use:

{
  "mcpServers": {
    "irishtaxhub": {
      "command": "python",
      "args": ["-m", "irishtaxhub_mcp.server"],
      "env": {
        "IRISHTAXHUB_BASE_URL": "https://prod.aws.irishtaxhub.ie",
        "IRISHTAXHUB_OPENAPI": "https://prod.aws.irishtaxhub.ie/apispec_1.json"
      }
    }
  }
}

For local development:

{
  "mcpServers": {
    "irishtaxhub": {
      "command": "python",
      "args": ["-m", "irishtaxhub_mcp.server"],
      "env": {
        "IRISHTAXHUB_BASE_URL": "http://localhost:5000",
        "IRISHTAXHUB_OPENAPI": "http://localhost:5000/openapi.json"
      }
    }
  }
}

Then restart Claude Desktop; tools will appear as openapi_list_endpoints, openapi_get_request_schema, and openapi_invoke.

Examples

Dynamic discovery + invocation:

{
  "tool": "openapi_list_endpoints",
  "arguments": { "tag": "Tax Calculators" }
}

{
  "tool": "openapi_get_request_schema",
  "arguments": { "path": "/v1/tax/calculators/refund", "method": "POST" }
}

{
  "tool": "openapi_invoke",
  "arguments": {
    "path": "/v1/tax/calculators/refund",
    "method": "POST",
    "body": {
      "marital_status": "single",
      "year": 2024,
      "employment_income": { "income": 50000 }
    }
  }
}

Notes

• Tools call your deployed HTTP API; they do not import internal Python modules. This keeps the MCP server lightweight and decoupled.

• Dynamic tools load your OpenAPI definition from a file or via HTTP. For local development, you can point IRISHTAXHUB_OPENAPI at your repo’s openapi.yaml — Jinja templating is supported.

• If you prefer in-process usage, you can create another variant inside the API repo that imports facades directly.

Claude PR Review (GitHub Action)

This repo includes a GitHub Action (.github/workflows/claude-pr-review.yml) that automatically reviews PRs using Claude. It requires a CLAUDE_CODE_OAUTH_TOKEN secret.

Generating the token

1. Run claude setup-token in your terminal — this opens a browser to authenticate with your Claude account and outputs an OAuth token

2. Copy the token

Setting the secret

gh secret set CLAUDE_CODE_OAUTH_TOKEN --repo jhurleyai/irishtaxhub-mcp

Paste the token when prompted.

When to regenerate

The token is tied to your Claude subscription. If your subscription lapses and you renew, the existing token is invalidated — you must run claude setup-token again and update the secret.