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

# Authentication required

> Stable Problem Details type URI page for authentication-required.

`https://agentvolumes.org/problems/authentication-required` identifies the `authentication-required` Problem Details type.

| Field       | Value                                                       |
| ----------- | ----------------------------------------------------------- |
| Type URI    | `https://agentvolumes.org/problems/authentication-required` |
| Slug        | `authentication-required`                                   |
| HTTP status | `401`                                                       |
| Title       | `Authentication required`                                   |
| Meaning     | Bearer authentication is missing or invalid.                |

Switch on the `type` URI when handling Agent Volumes Registry API errors. The human-readable `title` can vary by implementation or localization.

## Release archives

* [v0.1.0-rc.1 problem page](/spec/0.1.0-rc.1/problems/authentication-required)
* [v0.1.0-rc.1 API error table](/spec/0.1.0-rc.1/api/errors)

## Canonical sources

* [Problem Details schema](/spec/0.1.0-rc.1/schemas/problem-details.schema.json)
* [Problem registry schema](/spec/0.1.0-rc.1/schemas/problem-registry.schema.json)
* [Problem registry fixture](https://github.com/agent-volumes/agent-volumes-spec/blob/main/conformance/fixtures/problem-registry.json)