# Troubleshooting

Fixes for the common problems when adding box to an app or signing in, and how to reach support.

Start with `npx @simular-ai/box doctor`: it checks box's setup in each app and that the endpoint answers, and prints a fix for each problem it finds.

## Common problems

| Symptom | Fix |
| --- | --- |
| The browser page says "Can't connect this agent" | Sign in again; if it repeats, remove box and add it again. |
| A headless run (`codex exec`, `claude -p`) has no box tools, or every box call is refused | See [Headless agents](/docs/headless). |
| No box tools after signing in | Start a new chat. In Claude Code, `claude mcp list` shows whether `box` is connected; in Gemini CLI, `gemini mcp list`. |
| Signed out later | Access lasts the days chosen on the approval page; sign in again the same way. Connected apps and keys are listed on [Keys](https://box.simular.ai/keys). |
| The model says credits are used up | Your credits are spent. Add credits or choose a plan on [Billing](https://box.simular.ai/billing). |

The setup steps for each app are in [MCP server](/docs/mcp).

## Support

Email [support@simular.ai](mailto:support@simular.ai). Say which app you added box to and what went wrong.