# Unknown verb

`https://epcis.dev/errors/unknown-verb`

| | |
|---|---|
| status | 404 |
| retryable | false |
| costed | false |
| served by | epcis.dev · barcoding.dev · transactions.dev · worklists.dev · visibility.cloud · visibility.associates · id.org.ai |

The named verb is not served by this door. Fail closed on unknown identifiers: an unknown verb is an error, never a guess, and never the nearest verb this door does serve.

## What to do

Read the door's verb portfolio and call one of its verbs by its exact name. Universal verbs (get, list, create, update, delete) are cells in a matrix, not portfolio entries — §4.6.

## Derived from

- docs/specs/shared-surface.md §4.2
- docs/specs/shared-surface.md §4.6
- #249