# list_patterns

A read tool on the 3ilm MCP server.

Agent View of the PolicyLayer registry record for `list_patterns`. HTML page: https://policylayer.com/tools/3ilm-mcp/list-patterns

## Facts

- Tool: `list_patterns`
- Server: 3ilm (`3ilm-mcp`) — https://policylayer.com/tools/3ilm-mcp.md
- Install: `npx -y 3ilm-mcp`
- Homepage: https://github.com/holistis/3ilm-mcp
- Risk category: Read (Low risk)
- Registry record: grade A, 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_patterns",
    "arguments": {}
  }
}
```

## Why list_patterns is rated Low

Despite the empty description, the tool name 'list_patterns' strongly suggests it retrieves or enumerates a collection of patterns, likely security or vulnerability patterns given the context of sibling tools. This is a passive read operation with no side effects. The absence of a description lowers confidence slightly, but the semantic meaning of 'list_' is reliable enough to classify confidently as Read.

From the tool's own definition: "Tool name 'list_patterns' combined with sibling tools 'get_pattern_details' and 'search_vulnerabilities' indicates a query/retrieval operation. The 'list' prefix is characteristic of Read operations that enumerate data without modification."

## Use case

AI agents call list_patterns to retrieve information from 3ilm 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 3ilm:

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

## Other tools on 3ilm (2)

- `get_pattern_details` — Read — https://policylayer.com/tools/3ilm-mcp/get-pattern-details.md
- `search_vulnerabilities` — Read — https://policylayer.com/tools/3ilm-mcp/search-vulnerabilities.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=3ilm-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/3ilm-mcp