# system_run_lisp

A execute tool on the AutoCAD MCP Pro MCP server.

Agent View of the PolicyLayer registry record for `system_run_lisp`. HTML page: https://policylayer.com/tools/u-c4n-autocad-mcp/system-run-lisp

## Facts

- Tool: `system_run_lisp`
- 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: Execute (High 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": "system_run_lisp",
    "arguments": {}
  }
}
```

## Why system_run_lisp is rated High

This tool allows arbitrary AutoLISP code execution within the AutoCAD environment. AutoLISP has broad capabilities including file I/O, system command invocation, and unrestricted CAD manipulation. An AI agent with access to this tool could execute malicious code, modify production drawings without audit trails, delete entities, corrupt files, or trigger destructive CAD operations.

From the tool's own definition: "Tool name 'system_run_lisp' indicates execution of AutoLISP code. AutoLISP is a programming language embedded in AutoCAD that can modify drawings, invoke COM operations, execute external commands, and interact with the file system."

Risk signals: Admin/system-level operation

## Use case

AI agents invoke system_run_lisp to trigger actions in AutoCAD MCP Pro. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

## 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": {
    "system_run_lisp": {
      "limits": [
        {
          "counter": "system_run_lisp_rate",
          "window": "minute",
          "max": 10,
          "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
- `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
- `analysis_entity_stats` — Read — https://policylayer.com/tools/u-c4n-autocad-mcp/analysis-entity-stats.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