> ## Documentation Index
> Fetch the complete documentation index at: https://developers.kardinal.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Error codes

> Table of business errors and their meaning, beyond generic HTTP codes.

<Note>
  Reference — priority P0.
</Note>

## To be written

| Code                 | HTTP | Meaning                            | Recommended action           |
| -------------------- | ---- | ---------------------------------- | ---------------------------- |
| `INFEASIBLE_PROBLEM` | 422  | No route satisfies all constraints | See "Handling infeasibility" |
| `INVALID_API_KEY`    | 401  | Missing or invalid API key         | See "Authentication"         |
| ...                  | ...  | ...                                | ...                          |