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Contract: Slack Channel ReBAC Administration and Runtime

Scope​

Slack channel access becomes many-to-many. A Slack channel can be granted access to multiple agents, tools, and knowledge bases, while users must still satisfy team/channel/resource ReBAC checks before invoking anything from Slack.

Admin Endpoints​

GET /api/admin/slack/channels​

Lists Slack channels visible to the caller.

Query

  • team: optional CAIPE team scope.
  • search: optional channel name search.

Response

{
  "channels": [
    {
      "workspace_id": "T123",
      "channel_id": "C123",
      "name": "platform-support",
      "team_slugs": ["platform"],
      "status": "active"
    }
  ]
}

GET /api/admin/slack/channels/{workspace_id}/{channel_id}/resources​

Returns resources currently exposed through a Slack channel.

Response

{
  "channel": {
    "workspace_id": "T123",
    "channel_id": "C123",
    "name": "platform-support"
  },
  "resources": [
    {
      "resource_type": "agent",
      "resource_id": "platform-engineer",
      "relationship": "allowed_agent",
      "status": "active",
      "source_type": "manual"
    },
    {
      "resource_type": "knowledge_base",
      "resource_id": "platform-runbooks",
      "relationship": "allowed_knowledge_base",
      "status": "active",
      "source_type": "policy_rule"
    }
  ]
}

POST /api/admin/slack/channels/{workspace_id}/{channel_id}/resources​

Stages or applies resource grants for a Slack channel.

Request

{
  "mode": "stage",
  "grants": [
    {
      "resource_type": "agent",
      "resource_id": "platform-engineer",
      "relationship": "allowed_agent"
    },
    {
      "resource_type": "tool",
      "resource_id": "argocd.list_applications",
      "relationship": "allowed_tool"
    }
  ],
  "revocations": []
}

Response

{
  "change_set_id": "change-set-slack-001",
  "status": "validating",
  "validation": {
    "allowed": true,
    "warnings": []
  }
}

POST /api/admin/slack/channels/{workspace_id}/{channel_id}/access-check​

Previews whether a Slack user can invoke a selected resource from a channel.

Request

{
  "user_subject": "user-123",
  "resource_type": "agent",
  "resource_id": "platform-engineer",
  "action": "invoke"
}

Response

{
  "allowed": true,
  "checks": [
    {
      "name": "channel_membership",
      "allowed": true
    },
    {
      "name": "channel_resource_grant",
      "allowed": true
    },
    {
      "name": "user_resource_access",
      "allowed": true
    }
  ]
}

Runtime Contract​

Slack bot runtime must perform these checks for a message or slash command:

  1. Resolve Slack user to a Keycloak user subject.
  2. Resolve Slack channel to slack_channel:<channel_id>.
  3. Resolve selected agent/tool/knowledge base resource.
  4. Check user access to the Slack channel.
  5. Check channel access to the selected resource.
  6. Check user/team access to the selected resource.
  7. Deny by default with a user-safe explanation if any check fails.

Runtime Decision Shape​

{
  "allowed": false,
  "decision": "deny",
  "reason_code": "channel_resource_not_granted",
  "safe_message": "This Slack channel is not authorized to use the selected agent.",
  "audit": {
    "workspace_id": "T123",
    "channel_id": "C123",
    "resource_type": "agent",
    "resource_id": "platform-engineer"
  }
}

Errors​

  • 403: caller cannot administer the channel or selected resource.
  • 404: channel/resource not found or hidden from caller scope.
  • 409: selected channel is archived or resource enforcement state blocks the operation.
  • 422: relationship is unsupported for the selected resource type.