mcp-api-key-auth

Agent Building

This skill should be used when the user needs to set up, manage, or troubleshoot MCP API Key authentication and tool usage tracking for this stock data service. Use it when configuring external MCP clients (Claude Code, Cursor) to connect to the data service.

QUICK START

How to use this skill

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Source SKILL.md: https://github.com/Yourdaylight/stock_datasource/blob/HEAD/skills/mcp-api-key-auth/SKILL.md

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Purpose

Enable external MCP clients (Claude Code, Cursor, etc.) to authenticate with the stock data service using independent API keys, and track per-tool usage (table name, record count) for monitoring.

When to Use

User wants to create or manage MCP API keys
User wants to configure an external MCP client to connect to this service
User wants to view MCP tool usage statistics (which tools called, which tables queried, how many records)
User needs to troubleshoot MCP authentication errors (401, invalid key, expired key)

Architecture

API Key management is on the HTTP server (port 8000), protected by JWT login
MCP protocol is on the MCP server (port 8001), protected by API key in request headers
Usage tracking records are stored in ClickHouse mcp_tool_usage_log table

Workflow

1) Create an API Key

First login to get a JWT token, then create an API key:

# Login
JWT=$(curl -s -X POST http://<host>:8000/api/auth/login \
  -H "Content-Type: application/json" \
  -d '{"email":"your@email.com","password":"yourpassword"}' \
  | python3 -c "import sys,json; print(json.load(sys.stdin)['access_token'])")

# Create API key
curl -s -X POST http://<host>:8000/api/mcp-keys/create \
  -H "Authorization: Bearer $JWT" \
  -H "Content-Type: application/json" \
  -d '{"key_name": "my-cursor-key", "expires_days": 90}'

The response contains the full API key (e.g., sk-a1b2c3d4...). Save it immediately — it is only shown once.

2) Configure MCP Client

Claude Code / Claude Desktop

Add to your MCP configuration (claude_desktop_config.json or project .mcp.json):

{
  "mcpServers": {
    "stock-data": {
      "url": "http://<host>:8001/messages",
      "transport": "streamable-http",
      "headers": {
        "Authorization": "Bearer sk-your-api-key-here"
      }
    }
  }
}

Cursor

In Cursor settings, add an MCP server with:

URL: http://<host>:8001/messages
Header: Authorization: Bearer sk-your-api-key-here

3) Verify Connectivity

# Should return tool list (not 401)
curl -s -X POST http://<host>:8001/messages \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk-your-api-key-here" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}'

4) View Usage Statistics

# Usage history (paginated)
curl -s "http://<host>:8000/api/mcp-usage/history?page=1&page_size=20" \
  -H "Authorization: Bearer $JWT"

# Aggregated stats (last 30 days)
curl -s "http://<host>:8000/api/mcp-usage/stats?days=30" \
  -H "Authorization: Bearer $JWT"

5) Manage API Keys

# List all keys
curl -s http://<host>:8000/api/mcp-keys/list \
  -H "Authorization: Bearer $JWT"

# Revoke a key
curl -s -X POST http://<host>:8000/api/mcp-keys/revoke \
  -H "Authorization: Bearer $JWT" \
  -H "Content-Type: application/json" \
  -d '{"key_id": "<key-id>"}'

Key Endpoints

Endpoint	Method	Auth	Description
`/api/mcp-keys/create`	POST	JWT	Create new API key
`/api/mcp-keys/list`	GET	JWT	List user's API keys
`/api/mcp-keys/revoke`	POST	JWT	Revoke an API key
`/api/mcp-usage/history`	GET	JWT	Paginated usage history
`/api/mcp-usage/stats`	GET	JWT	Aggregated usage stats
`/messages` (MCP)	POST	API Key	MCP protocol endpoint

Troubleshooting

401 "API key required": Missing Authorization header on MCP calls
401 "Invalid or expired API key": Key was revoked or expired — create a new one
initialize works but tools/list fails: initialize does not require auth; tools/list and tools/call do
Usage not showing up: Usage logging is fire-and-forget; check ClickHouse mcp_tool_usage_log table directly

Verification Checklist

API key created and full key returned (shown only once)
tools/list returns 401 without API key
tools/list returns tool list with valid API key
tools/call records usage in mcp_tool_usage_log table
Revoked key returns 401 on subsequent calls
Usage history API returns correct data
Usage stats show daily call counts and top tools