# dephq_app_rollback

Restore an owned app's source from a selected historical version. This creates a new current version.

Agent View of the PolicyLayer registry record for `dephq_app_rollback`. HTML page: https://policylayer.com/tools/dephq-mcp/dephq-app-rollback

## Facts

- Tool: `dephq_app_rollback`
- Server: Dephq (`@dephq/mcp`) — https://policylayer.com/tools/dephq-mcp.md
- Install: `npx -y @dephq/mcp`
- Homepage: https://www.npmjs.com/package/@dephq/mcp
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 2 (2 required)
- Recommended policy verdict: Rate-limited

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `app_id` | string | yes |  |
| `version_id` | string | yes |  |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "dephq_app_rollback",
    "arguments": {
      "app_id": "<app_id>",
      "version_id": "<version_id>"
    }
  }
}
```

## Why dephq_app_rollback is rated Medium

The rollback operation replaces the current app source with a historical version and creates a new current version. This is a Write/modify operation (not Destructive since the historical versions remain intact and a new version is created rather than deleting data).

From the tool's own definition: "Restore an owned app's source from a selected historical version. This creates a new current version."

## Use case

AI agents use dephq_app_rollback to create or update resources in Dephq, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Dephq environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Dephq:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "dephq_app_rollback": {
      "limits": [
        {
          "counter": "dephq_app_rollback_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Dephq (11)

- `dephq_app_unpublish` — Destructive — https://policylayer.com/tools/dephq-mcp/dephq-app-unpublish.md
- `dephq_app_check` — Execute — https://policylayer.com/tools/dephq-mcp/dephq-app-check.md
- `dephq_account` — Read — https://policylayer.com/tools/dephq-mcp/dephq-account.md
- `dephq_app_show` — Read — https://policylayer.com/tools/dephq-mcp/dephq-app-show.md
- `dephq_app_versions` — Read — https://policylayer.com/tools/dephq-mcp/dephq-app-versions.md
- `dephq_apps_list` — Read — https://policylayer.com/tools/dephq-mcp/dephq-apps-list.md
- `dephq_project_validate` — Read — https://policylayer.com/tools/dephq-mcp/dephq-project-validate.md
- `dephq_sync_status` — Read — https://policylayer.com/tools/dephq-mcp/dephq-sync-status.md
- `dephq_app_publish` — Write — https://policylayer.com/tools/dephq-mcp/dephq-app-publish.md
- `dephq_project_init` — Write — https://policylayer.com/tools/dephq-mcp/dephq-project-init.md
- `dephq_project_sync` — Write — https://policylayer.com/tools/dephq-mcp/dephq-project-sync.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=dephq-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/dephq-mcp