# list_category_parameters

A read tool on the Revit MCP Server MCP server.

Agent View of the PolicyLayer registry record for `list_category_parameters`. HTML page: https://policylayer.com/tools/demolinator-revit-mcp-server/list-category-parameters

## Facts

- Tool: `list_category_parameters`
- Server: Revit MCP Server (`demolinator/revit-mcp-server`) — https://policylayer.com/tools/demolinator-revit-mcp-server.md
- Homepage: https://github.com/Demolinator/revit-mcp-server
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

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

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

## Why list_category_parameters is rated Low

The 'list' verb strongly indicates a read operation that retrieves or queries data from the Revit model without side effects. The absence of description lowers confidence slightly, but the tool name pattern is unambiguous for data retrieval. No evidence of creation, modification, deletion, execution, or financial impact.

From the tool's own definition: "Tool name 'list_category_parameters' indicates retrieval/enumeration of parameters by category; no description provided, but naming convention and context (sibling tools include read operations like 'analyze_model_statistics' and 'check_clashes') suggest…"

## Use case

AI agents call list_category_parameters to retrieve information from Revit MCP Server 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 Revit MCP Server:

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

## Other tools on Revit MCP Server (47)

- `delete_elements` — Destructive — https://policylayer.com/tools/demolinator-revit-mcp-server/delete-elements.md
- `execute_revit_code` — Execute — https://policylayer.com/tools/demolinator-revit-mcp-server/execute-revit-code.md
- `set_active_view` — Execute — https://policylayer.com/tools/demolinator-revit-mcp-server/set-active-view.md
- `transform_elements` — Execute — https://policylayer.com/tools/demolinator-revit-mcp-server/transform-elements.md
- `ai_element_filter` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/ai-element-filter.md
- `analyze_model_statistics` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/analyze-model-statistics.md
- `check_clashes` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/check-clashes.md
- `export_room_data` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/export-room-data.md
- `get_current_view_elements` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/get-current-view-elements.md
- `get_current_view_info` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/get-current-view-info.md
- `get_element_properties` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/get-element-properties.md
- `get_material_quantities` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/get-material-quantities.md
- `get_revit_model_info` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/get-revit-model-info.md
- `get_revit_status` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/get-revit-status.md
- `get_revit_view` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/get-revit-view.md
- `get_selected_elements` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/get-selected-elements.md
- `list_families` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/list-families.md
- `list_family_categories` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/list-family-categories.md
- `list_levels` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/list-levels.md
- `list_revit_views` — Read — https://policylayer.com/tools/demolinator-revit-mcp-server/list-revit-views.md
- `clear_colors` — Write — https://policylayer.com/tools/demolinator-revit-mcp-server/clear-colors.md
- `color_splash` — Write — https://policylayer.com/tools/demolinator-revit-mcp-server/color-splash.md
- `create_detail_line` — Write — https://policylayer.com/tools/demolinator-revit-mcp-server/create-detail-line.md
- `create_dimensions` — Write — https://policylayer.com/tools/demolinator-revit-mcp-server/create-dimensions.md
- `create_duct` — Write — https://policylayer.com/tools/demolinator-revit-mcp-server/create-duct.md
- `create_grid` — Write — https://policylayer.com/tools/demolinator-revit-mcp-server/create-grid.md
- `create_level` — Write — https://policylayer.com/tools/demolinator-revit-mcp-server/create-level.md
- `create_line_based_element` — Write — https://policylayer.com/tools/demolinator-revit-mcp-server/create-line-based-element.md
- `create_mep_system` — Write — https://policylayer.com/tools/demolinator-revit-mcp-server/create-mep-system.md
- `create_pipe` — Write — https://policylayer.com/tools/demolinator-revit-mcp-server/create-pipe.md
- …and 17 more: https://policylayer.com/tools/demolinator-revit-mcp-server.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=demolinator-revit-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/demolinator-revit-mcp-server