Cursor security
How to protect .env, SSH keys, and tokens when using Cursor agents
.env files, ignored files, and private workspace notes are not a security boundary once an AI coding agent can run shell commands, call MCP tools, or inspect logs. The agent may not need to open a file directly to expose what the local environment can reach.
A local-first broker starts with a risk scan: .env variants, SSH identities, GitHub CLI auth, Firebase and Vercel state, database connection strings, Stripe keys, and MCP server configs. Then it lets Cursor operate through short-lived grants instead of ambient credentials.
That gives developers a practical middle layer between blocking the agent entirely and letting it inherit the whole workstation.
Find agent-reachable secrets before a session starts.
Replace ambient .env access with scoped service capabilities.
Use read-only database grants for staging inspection.
Revoke a grant without rotating the original key.
Why ignored files are not enough
A Cursor agent with terminal or tool access can often reach credentials indirectly through environment variables, CLIs, logs, generated files, and MCP servers. Treat .env as inventory to protect, not as the access boundary.
Safer Cursor agent credential flow
Scan the workspace, classify reachable secrets, create a temporary grant for the exact task, and route Cursor through the broker so database, deploy, and token actions are logged and revocable.
Common questions
Should Cursor agents read .env files directly?
The safer default is no. Cursor should receive task-scoped capabilities while raw .env values remain behind a broker or secrets boundary.
What should a credential risk scan include?
Check .env variants, SSH keys, GitHub CLI auth, Firebase and Vercel tokens, database URLs, Stripe keys, cloud credentials, and MCP server configs.