Cactus

Is Cactus MCP server safe?

• It needs an account, so we could only check it from outside. Its tools are behind the login.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

Test results

We could only check it from outside. The owner can test everything behind the login. How the test works

• ✓
  Login setup follows the spec

  All good

  • ✓The server asks for a login (it answers 401 to an anonymous request).
  • ✓The 401 reply points AI apps to the login details (resource_metadata).
  • ✓The login details name this exact server.
  • ✓Found the login server's description at https://mcp.heycactus.ai/.well-known/oauth-authorization-server.
  • ✓The login server's name matches what the server points to.
  • ✓PKCE with S256 is supported.
  • ✓AI apps can register themselves (dynamic registration and client ID metadata documents).
  pass
• –
  Asks for a login firstEverything else is behind the login, so we did not score it.
  not tested

Test it yourself

Is this your server? This signs in with your account and tests everything behind the login.

Score over time

• 16 Oct 2026not scored
• 17 Oct 2026not scored
• 18 Oct 2026not scored
• 23 Oct 2026not scored

Reviews

Coming soon: reviews from people who use Cactus, signed in with GitHub, one per person. Reviews never change the score.