DB-MCP

Instead of copy-pasting query results between your DB client and your AI tool, the gateway lets your AI query the database directly. It can explore schemas, inspect tables, and run SELECT queries. Itcannotinsert, update, delete, or drop anything.

Option A — Docker (recommended, no local install needed)

git clone https://github.com/mdadul/db-mcp cd db-mcp # Generate .env with secure random keys, then start sh scripts/setup.sh docker compose up

docker composepulls the pre-built image from Docker Hub — no build step required.
TheMCP_TOKENis printed bysetup.sh— copy it before you close the terminal.

git clone https://github.com/mdadul/db-mcp cd db-mcp bun install bun run dev # generates .env automatically, then starts the server

claude mcp add --transport http db-mcp http://localhost:4080/mcp \ --header "Authorization: Bearer <MCP_TOKEN>"

{ "mcpServers": { "db-mcp": { "url": "http://localhost:4080/mcp", "headers": { "Authorization": "Bearer <MCP_TOKEN>" } } } }

Claude.ai requires HTTPS. Expose the gateway through a tunnel first:

# Option A — Cloudflare (no account needed) npx cloudflared tunnel --url http://localhost:4080 # Option B — ngrok ngrok http 4080

Copy thehttps://...URL from the tunnel output, then add it in Claude.ai → Settings → Integrations → Add MCP Server.

"How many orders were created this week?" "What columns does theuserstable have?" "Show me the last 10 failed jobs."

The AI will call the gateway tools automatically — no copy-pasting.

A.envfile is created with generated values on first run.

Tools not showing up in Claude CodeRestart Claude Code after adding the MCP server. If still missing, runclaude mcp listto confirm it's registered and shows✓ Connected.

"Failed to connect" in Claude CodeCheck the gateway is running (http://localhost:4080should load) and the token in your config matches.env.

"Session not found" errorsThe gateway is stateless — each request is independent. If you see this, reconnect the MCP server in your IDE.

"URL must start with https"(Claude.ai Web) Claude.ai blocks plain HTTP. Use a tunnel — see the Claude.ai Web setup above.

Connection refused to my databaseIf the gateway runs in Docker and your database is on the host, usehost.docker.internalinstead oflocalhostas the host.

- TheMCP_TOKENcontrols access to all your databases via the gateway. Treat it like a password.
- Database credentials are encrypted with AES-256-GCM. The key lives only inENCRYPTION_KEY— never in the database.
- OnlySELECT,SHOW,DESCRIBE, andEXPLAINare permitted. Write operations are rejected at the gateway layer before reaching the database.
- All queries are logged in the web dashboard under each database's Logs tab.

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