# get_block_rules_device

Read what ONE device ENFORCES — the EFFECTIVE 4-tier block-rule union (global ++ service ++ user ++ device, de-duped by id, device wins then user then service then global) plus the SERVICE list (the applied service groups' rules, flattened in service-group name order), the device owner's USER list, and that device's per-device list. Pass device_uuid or deviceName. A rule shadowed on this device by a same-id higher tier is correctly absent — this is the policy in force here, not the fleet catalogue. For the fleet-wide global tier use get_block_rules_global.

Agent View of the PolicyLayer registry record for `get_block_rules_device`. HTML page: https://policylayer.com/tools/dev-busymate-busymate-devtools/get-block-rules-device

## Facts

- Tool: `get_block_rules_device`
- Server: Busymate DevTools (`https://mcp.busymate.dev`) — https://policylayer.com/tools/dev-busymate-busymate-devtools.md
- Homepage: https://github.com/serebano/busymate-devtools
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 2
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `deviceName` | string | no |  |
| `device_uuid` | string | no |  |

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": "get_block_rules_device",
    "arguments": {}
  }
}
```

## Why get_block_rules_device is rated Low

Even though get_block_rules_device only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

## Use case

AI agents call get_block_rules_device to retrieve information from Busymate DevTools without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Busymate DevTools:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_block_rules_device": {}
  }
}
```

## Other tools on Busymate DevTools (43)

- `share_advisor_finding` — Execute — https://policylayer.com/tools/dev-busymate-busymate-devtools/share-advisor-finding.md
- `summarize_device_traffic` — Execute — https://policylayer.com/tools/dev-busymate-busymate-devtools/summarize-device-traffic.md
- `download_snapshot` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/download-snapshot.md
- `export_har` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/export-har.md
- `get_advisor_finding` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-advisor-finding.md
- `get_audit_event` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-audit-event.md
- `get_device` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-device.md
- `get_device_egress_fail_posture` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-device-egress-fail-posture.md
- `get_device_egress_status` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-device-egress-status.md
- `get_device_health` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-device-health.md
- `get_device_settings` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-device-settings.md
- `get_device_status` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-device-status.md
- `get_entry` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-entry.md
- `get_entry_count` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-entry-count.md
- `get_my_account` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-my-account.md
- `get_push_response` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-push-response.md
- `get_service_group` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-service-group.md
- `get_stats` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-stats.md
- `get_status` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-status.md
- `get_subscription` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-subscription.md
- `get_todo` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-todo.md
- `get_usage` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-usage.md
- `get_workspace` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/get-workspace.md
- `inspect_requests` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/inspect-requests.md
- `list_advisor_findings` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/list-advisor-findings.md
- `list_audit_events` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/list-audit-events.md
- `list_breakpoint_events` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/list-breakpoint-events.md
- `list_device_audit_modes` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/list-device-audit-modes.md
- `list_device_events` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/list-device-events.md
- `list_device_service_groups` — Read — https://policylayer.com/tools/dev-busymate-busymate-devtools/list-device-service-groups.md
- …and 13 more: https://policylayer.com/tools/dev-busymate-busymate-devtools.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-busymate-busymate-devtools · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/dev-busymate-busymate-devtools