The four MCP servers actually worth wiring up

The shortlist

• Filesystem — scoped to a project root, not your home directory.
• Git — history and blame answers without shelling out.
• Fetch — reading docs pages inline beats copy-pasting them.
• Postgres — read-only credentials, schema questions answered instantly.

Wiring one up

claude mcp add fetch -- npx -y @modelcontextprotocol/server-fetch
claude mcp list

What to avoid

Anything that writes to production, anything unscoped, and anything you would not hand a new contractor on day one.