Dear Diary returns structured MCP errors for common failure cases:
Table 7: Common error conditions.
| Condition | Error code | Resolution |
|---|---|---|
| Missing collection name | INVALID_PARAMS |
Provide collection_name or set COLLECTION_NAME |
| Collection does not exist | — | Use qdrant_store to create the collection |
| Server in read-only mode | INVALID_REQUEST |
Disable read-only mode for write operations |
| Connection failure | INTERNAL_ERROR |
Verify Qdrant URL and credentials |
| Arbitrary filter not enabled | INVALID_PARAMS |
Filters require additional configuration |