# agentbrush_login

Authenticate this CLI with your AgentBrush account using device authorization. Opens a browser window where you approve the connection. After approval, API credentials are saved locally and persist across sessions. Only needs to be called once. Call this if agentbrush_check_status reports unauthenticated, or if agentbrush_generate fails with an authentication error. If already authenticated with a valid key, returns the current plan and token balance without starting a new auth flow. The tool blocks while waiting for browser approval (up to 15 minutes). No input parameters required.

Agent View of the PolicyLayer registry record for `agentbrush_login`. HTML page: https://policylayer.com/tools/dev-agentbrush-mcp-server/agentbrush-login

## Facts

- Tool: `agentbrush_login`
- Server: Mcp Server (`@agentbrush/mcp-server`) — https://policylayer.com/tools/dev-agentbrush-mcp-server.md
- Install: `npx -y @agentbrush/mcp-server`
- Homepage: https://www.npmjs.com/package/@agentbrush/mcp-server
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

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

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "agentbrush_login",
    "arguments": {}
  }
}
```

## Why agentbrush_login is rated Medium

The tool authenticates the CLI and saves API credentials locally. This is a Write operation because it creates/stores persistent credentials on the local system. It's not purely Read (it has side effects) and not Execute (no code/commands run).

From the tool's own definition: "API credentials are saved locally and persist across sessions"

## Use case

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

## Recommended policy (PolicyLayer)

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

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

## Other tools on Mcp Server (11)

- `agentbrush_remove_background` — Destructive — https://policylayer.com/tools/dev-agentbrush-mcp-server/agentbrush-remove-background.md
- `agentbrush_edit_mask` — Execute — https://policylayer.com/tools/dev-agentbrush-mcp-server/agentbrush-edit-mask.md
- `agentbrush_edit_mask_open` — Execute — https://policylayer.com/tools/dev-agentbrush-mcp-server/agentbrush-edit-mask-open.md
- `agentbrush_check_status` — Read — https://policylayer.com/tools/dev-agentbrush-mcp-server/agentbrush-check-status.md
- `agentbrush_list_presets` — Read — https://policylayer.com/tools/dev-agentbrush-mcp-server/agentbrush-list-presets.md
- `agentbrush_list_references` — Read — https://policylayer.com/tools/dev-agentbrush-mcp-server/agentbrush-list-references.md
- `agentbrush_edit_mask_result` — Write — https://policylayer.com/tools/dev-agentbrush-mcp-server/agentbrush-edit-mask-result.md
- `agentbrush_generate` — Write — https://policylayer.com/tools/dev-agentbrush-mcp-server/agentbrush-generate.md
- `agentbrush_init` — Write — https://policylayer.com/tools/dev-agentbrush-mcp-server/agentbrush-init.md
- `agentbrush_populate_identity` — Write — https://policylayer.com/tools/dev-agentbrush-mcp-server/agentbrush-populate-identity.md
- `agentbrush_save_as_reference` — Write — https://policylayer.com/tools/dev-agentbrush-mcp-server/agentbrush-save-as-reference.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=dev-agentbrush-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/dev-agentbrush-mcp-server