Michael Suchacz 6826da9397 feat: restore agents-access as a default organization role (#30004)
Restores `agents-access` (**Coder Agents User**) as a built-in
organization role and adds it to every organization's
`default_org_member_roles`. Members keep Coder Agents by default, and
admins can now restrict it per organization by removing the role from
the defaults and granting it through IdP role sync or direct assignment.

Since #28186, chat permissions lived in the organization-member floor,
so the only way to limit Coder Agents was narrowing per-model access
lists, which did not hide the feature.

- Migration 000602 appends `agents-access` to every organization's
defaults, so upgrading keeps every member's access. New organizations
get it from `rbac.DefaultOrgMemberRoles()`.
- Service accounts do not inherit the role from the defaults
(`GetAuthorizationUserRoles`), so they still need an explicit grant for
chat.
- Owners and Organization Admins keep chat access regardless of
defaults. Chats shared with a user stay readable without the role.
- Role sync is unchanged. It does not store default roles, so after the
default is removed a mapped user gets `agents-access` at their next
sign-in.
- The retired-role mechanism (`IsRetiredRoleName`) is removed.
- `PATCH /api/v2/organizations/{organization}` rejects duplicate
`default_org_member_roles` entries (the CLI already de-duplicated them).
- Custom organization role requests treat built-in role names
case-insensitively, since custom role names are stored lowercase and
`Agents-Access` would otherwise become an undeletable shadow of the
built-in role.
- The Agents permission alert tells restricted members their chats are
kept, and the model selector for users without chat permission no longer
claims that no models are configured.

Docs add "Control who can use Coder Agents" to the Agents
getting-started guide.

**NOTE**: Migration 000602 deletes custom roles named `agents-access`,
which the built-in role would shadow. The down migration does not
restore them. Stored member grants of `agents-access` from the earlier
built-in role or a deleted custom role stay and now grant chat access.

## Validation

- Remote dogfood
[UAT](https://dogfood.cdr.dev/agents/e1c18dc6-f6f0-49a1-b6cd-6ce014b51a86)
passed on fb441dfae5, covering case variants of built-in role names on
create, update, delete, default roles, and member grants. The previous
round, on a6fef66b3f, passed the upgrade from main 5dde49dffb on a
fresh database. 6b7f107e0b only changes wording (docs, comments, UI
copy, CLI help) and did not go through UAT.
- Local: rbac, dbauthz, idpsync, migrations (chain including 000602 down
and up), querier, httpmw, provisionerdserver, coderd and enterprise
chat, role, and organization tests, chatd, toolsdk, CLI; frontend
vitest, story tests, biome, oxlint, tsc.

## Known issues (not changed here)

- Sending from a chat page that was already open when access was removed
shows a generic 404 panel until reload.
- The members page role editor is not locked for OIDC users under org
role sync; the API rejects the change with 400.
- Creating a custom role named after a system role
(`organization-member`, `organization-service-account`) returns 400 with
a raw database unique-constraint error.

<details>
<summary>Review record</summary>

- Remote UAT (UAT Critic sub-agent `6636c855ec`): round 1 on 8bec029d35
passed with issues, fixed in d7ba937a10 and e0f16e1a45f; round 2 on
a6fef66b3f passed; round 3 on fb441dfae5 passed.
- Codex: round 1 on a6fef66b3f found one P2 (case variants of built-in
role names), fixed in fb441dfae5 with a red-green test. Rounds 2 and 3
on fb441dfae5 found no major issues.
- mafredri on fb441dfae5 (PR text only): nine wording suggestions
applied in 6b7f107e0b9; NOTE extended for stored grants; description
trimmed.
- Frontend: FE1 to FE10 and coder-frontend-review checkpoints
self-audited.

</details>

> 🤖 This PR was opened by [Xum](https://mux.coder.com) on behalf of
@ibetitsmike.
2026-09-27 23:34:26 +02:00
…
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