# layer_lock

Lock a layer (entities visible but cannot be selected or modified).

Agent View of the PolicyLayer registry record for `layer_lock`. HTML page: https://policylayer.com/tools/u-c4n-autocad-mcp/layer-lock

## Facts

- Tool: `layer_lock`
- Server: AutoCAD MCP Pro (`u-c4n/autocad-mcp`) — https://policylayer.com/tools/u-c4n-autocad-mcp.md
- Homepage: https://github.com/U-C4N/Autocad-MCP
- 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": "layer_lock",
    "arguments": {}
  }
}
```

## Why layer_lock is rated Medium

Locking a layer is a reversible modification operation (can be unlocked). It does not delete data (ruling out Destructive) and does not execute arbitrary code (ruling out Execute). While it restricts access, the core action is modifying layer properties, which is a Write operation.

From the tool's own definition: "Tool description states it 'Lock[s] a layer' which modifies layer state/properties, preventing selection and modification of entities on that layer. This is a state-changing operation on CAD document metadata."

## Use case

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

## Recommended policy (PolicyLayer)

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

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

## Other tools on AutoCAD MCP Pro (246)

- `block_explode` — Destructive — https://policylayer.com/tools/u-c4n-autocad-mcp/block-explode.md
- `construction_clear` — Destructive — https://policylayer.com/tools/u-c4n-autocad-mcp/construction-clear.md
- `drawing_purge` — Destructive — https://policylayer.com/tools/u-c4n-autocad-mcp/drawing-purge.md
- `entity_delete` — Destructive — https://policylayer.com/tools/u-c4n-autocad-mcp/entity-delete.md
- `entity_delete_many` — Destructive — https://policylayer.com/tools/u-c4n-autocad-mcp/entity-delete-many.md
- `layer_delete` — Destructive — https://policylayer.com/tools/u-c4n-autocad-mcp/layer-delete.md
- `layer_state_delete` — Destructive — https://policylayer.com/tools/u-c4n-autocad-mcp/layer-state-delete.md
- `layout_delete` — Destructive — https://policylayer.com/tools/u-c4n-autocad-mcp/layout-delete.md
- `transaction_rollback` — Destructive — https://policylayer.com/tools/u-c4n-autocad-mcp/transaction-rollback.md
- `viewport_delete` — Destructive — https://policylayer.com/tools/u-c4n-autocad-mcp/viewport-delete.md
- `batch_plot` — Execute — https://policylayer.com/tools/u-c4n-autocad-mcp/batch-plot.md
- `cad_batch` — Execute — https://policylayer.com/tools/u-c4n-autocad-mcp/cad-batch.md
- `entity_array_polar` — Execute — https://policylayer.com/tools/u-c4n-autocad-mcp/entity-array-polar.md
- `gear_draw_section_aa` — Execute — https://policylayer.com/tools/u-c4n-autocad-mcp/gear-draw-section-aa.md
- `pid_tag_parse` — Execute — https://policylayer.com/tools/u-c4n-autocad-mcp/pid-tag-parse.md
- `solid_boolean` — Execute — https://policylayer.com/tools/u-c4n-autocad-mcp/solid-boolean.md
- `solid_extrude` — Execute — https://policylayer.com/tools/u-c4n-autocad-mcp/solid-extrude.md
- `solid_revolve` — Execute — https://policylayer.com/tools/u-c4n-autocad-mcp/solid-revolve.md
- `system_launch` — Execute — https://policylayer.com/tools/u-c4n-autocad-mcp/system-launch.md
- `system_run_command` — Execute — https://policylayer.com/tools/u-c4n-autocad-mcp/system-run-command.md
- `system_run_lisp` — Execute — https://policylayer.com/tools/u-c4n-autocad-mcp/system-run-lisp.md
- `view_named_restore` — Execute — https://policylayer.com/tools/u-c4n-autocad-mcp/view-named-restore.md
- `view_zoom_extents` — Execute — https://policylayer.com/tools/u-c4n-autocad-mcp/view-zoom-extents.md
- `view_zoom_window` — Execute — https://policylayer.com/tools/u-c4n-autocad-mcp/view-zoom-window.md
- `datum_feature` — Other — https://policylayer.com/tools/u-c4n-autocad-mcp/datum-feature.md
- `drawing_critique` — Other — https://policylayer.com/tools/u-c4n-autocad-mcp/drawing-critique.md
- `drawing_finalize` — Other — https://policylayer.com/tools/u-c4n-autocad-mcp/drawing-finalize.md
- `drawing_plan` — Other — https://policylayer.com/tools/u-c4n-autocad-mcp/drawing-plan.md
- `transaction_begin` — Other — https://policylayer.com/tools/u-c4n-autocad-mcp/transaction-begin.md
- `analysis_bounding_box` — Read — https://policylayer.com/tools/u-c4n-autocad-mcp/analysis-bounding-box.md
- …and 216 more: https://policylayer.com/tools/u-c4n-autocad-mcp.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=u-c4n-autocad-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/u-c4n-autocad-mcp