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**WIP** Update spec to include tag history endpoint #606

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Update spec to include tag history endpoint
jcarter3 Apr 23, 2026
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Merge branch 'main' into tag_history
jcarter3 Apr 23, 2026
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74 changes: 54 additions & 20 deletions spec.md
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Expand Up @@ -601,6 +601,39 @@ Previous versions of this specification did not include the `Link` header.
Clients depending on the number of tags returned matching `n` may prematurely stop pagination on registries using the `Link` header.
When available, clients should prefer the `Link` header over using the `last` parameter for pagination.

#### Listing Tag History

To fetch the history of a given tag, perform a `GET` request to a path in the following format: `/v2/<name>/tag/<tag>/history` <sup>[end-15](#endpoints)</sup>
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@sudo-bmitch sudo-bmitch Apr 23, 2026 •
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If someone called:

/v2/project-x/tag/manifests/history

That could be the tag history for the tag manifests. Or it could be the manifest for the tag history in the repo project-x/tag.

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@sudo-bmitch sudo-bmitch Apr 23, 2026

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One idea is to use the _oci extension: _oci/tags/history.


`<name>` is the namespace of the repository, and `<tag>` is the name of the tag to get the history of.

Assuming a repository and tag are found, this request MUST return a `200 OK` response code.

Upon success, the response MUST be a JSON list of descriptors the tag has referenced.
The registry SHOULD include the timestamp the tag was created as an annotation on the descriptor, and the response sorted in descending order by creation date (newest first).

<bits about paging behavior>

```json
[
{
"mediaType": "application/vnd.oci.image.manifest.v1+json",
"size": 1234,
"digest": "sha256:a1a1a1...",
"annotations": {
"org.opencontainers.tag.created": "2026-05-04T03:02:01Z"
}
},{
"mediaType": "application/vnd.oci.image.manifest.v1+json",
"size": 1234,
"digest": "sha256:b2b2b2...",
"annotations": {
"org.opencontainers.tag.created": "2026-04-03T02:01:00Z"
}
}
]
```

#### Listing Referrers

*Note: this feature was added in distibution-spec 1.1.
Expand Down Expand Up @@ -824,26 +857,27 @@ This endpoint MAY be used for authentication/authorization purposes, but this is

### Endpoints

| ID | Method | API Endpoint | Success | Failure |
|---------| -------------- |----------------------------------------------------------------| ----------- |-------------------|
| end-1 | `GET` | `/v2/` | `200` | `404`/`401` |
| end-2 | `GET` / `HEAD` | `/v2/<name>/blobs/<digest>` | `200` | `404` |
| end-3 | `GET` / `HEAD` | `/v2/<name>/manifests/<reference>` | `200` | `404` |
| end-4a | `POST` | `/v2/<name>/blobs/uploads/` | `202` | `404` |
| end-4b | `POST` | `/v2/<name>/blobs/uploads/?digest=<digest>` | `201`/`202` | `404`/`400` |
| end-5 | `PATCH` | `/v2/<name>/blobs/uploads/<reference>` | `202` | `404`/`416` |
| end-6 | `PUT` | `/v2/<name>/blobs/uploads/<reference>?digest=<digest>` | `201` | `404`/`400`/`416` |
| end-7a | `PUT` | `/v2/<name>/manifests/<reference>` | `201` | `404`/`413` |
| end-7b | `PUT` | `/v2/<name>/manifests/<digest>?tag=1&tag=2&tag=3` | `201` | `404`/`413` |
| end-8a | `GET` | `/v2/<name>/tags/list` | `200` | `404` |
| end-8b | `GET` | `/v2/<name>/tags/list?n=<integer>&last=<tagname>` | `200` | `404` |
| end-9 | `DELETE` | `/v2/<name>/manifests/<reference>` | `202` | `404`/`400`/`405` |
| end-10 | `DELETE` | `/v2/<name>/blobs/<digest>` | `202` | `404`/`400`/`405` |
| end-11 | `POST` | `/v2/<name>/blobs/uploads/?mount=<digest>&from=<other_name>` | `201`/`202` | `404` |
| end-12a | `GET` | `/v2/<name>/referrers/<digest>` | `200` | `404`/`400` |
| end-12b | `GET` | `/v2/<name>/referrers/<digest>?artifactType=<artifactType>` | `200` | `404`/`400` |
| end-13 | `GET` | `/v2/<name>/blobs/uploads/<reference>` | `204` | `404` |
| end-14 | `DELETE` | `/v2/<name>/blobs/uploads/<reference>` | `204` | `404`/`400` |
| ID | Method | API Endpoint | Success | Failure |
|---------| -------------- |--------------------------------------------------------------| ----------- |-------------------|
| end-1 | `GET` | `/v2/` | `200` | `404`/`401` |
| end-2 | `GET` / `HEAD` | `/v2/<name>/blobs/<digest>` | `200` | `404` |
| end-3 | `GET` / `HEAD` | `/v2/<name>/manifests/<reference>` | `200` | `404` |
| end-4a | `POST` | `/v2/<name>/blobs/uploads/` | `202` | `404` |
| end-4b | `POST` | `/v2/<name>/blobs/uploads/?digest=<digest>` | `201`/`202` | `404`/`400` |
| end-5 | `PATCH` | `/v2/<name>/blobs/uploads/<reference>` | `202` | `404`/`416` |
| end-6 | `PUT` | `/v2/<name>/blobs/uploads/<reference>?digest=<digest>` | `201` | `404`/`400`/`416` |
| end-7a | `PUT` | `/v2/<name>/manifests/<reference>` | `201` | `404`/`413` |
| end-7b | `PUT` | `/v2/<name>/manifests/<digest>?tag=1&tag=2&tag=3` | `201` | `404`/`413` |
| end-8a | `GET` | `/v2/<name>/tags/list` | `200` | `404` |
| end-8b | `GET` | `/v2/<name>/tags/list?n=<integer>&last=<tagname>` | `200` | `404` |
| end-9 | `DELETE` | `/v2/<name>/manifests/<reference>` | `202` | `404`/`400`/`405` |
| end-10 | `DELETE` | `/v2/<name>/blobs/<digest>` | `202` | `404`/`400`/`405` |
| end-11 | `POST` | `/v2/<name>/blobs/uploads/?mount=<digest>&from=<other_name>` | `201`/`202` | `404` |
| end-12a | `GET` | `/v2/<name>/referrers/<digest>` | `200` | `404`/`400` |
| end-12b | `GET` | `/v2/<name>/referrers/<digest>?artifactType=<artifactType>` | `200` | `404`/`400` |
| end-13 | `GET` | `/v2/<name>/blobs/uploads/<reference>` | `204` | `404` |
| end-14 | `DELETE` | `/v2/<name>/blobs/uploads/<reference>` | `204` | `404`/`400` |
| end-15 | `GET` | `/v2/<name>/tag/<tag>/history?n=<integer>` | `200` | `404` |

### Error Codes

Expand Down
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