# list_update

A write tool on the Container-MCP MCP server.

Agent View of the PolicyLayer registry record for `list_update`. HTML page: https://policylayer.com/tools/54rt1n-container-mcp/list-update

## Facts

- Tool: `list_update`
- Server: Container-MCP (`54rt1n/container-mcp`) — https://policylayer.com/tools/54rt1n-container-mcp.md
- Homepage: https://github.com/54rt1n/container-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": "list_update",
    "arguments": {}
  }
}
```

## Why list_update is rated Medium

The name implies a Write operation (updating a list), but the empty description provides no confirmation. Given the server context (MCP with file, KB, and execution capabilities), this likely modifies some list resource. Confidence is low due to the absent description. Severity is medium as list modifications are typically reversible writes.

From the tool's own definition: "Tool name 'list_update' suggests modifying a list or collection; description is empty and uninformative."

## Use case

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

## Recommended policy (PolicyLayer)

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

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

## Other tools on Container-MCP (26)

- `fs_delete` — Destructive — https://policylayer.com/tools/54rt1n-container-mcp/fs-delete.md
- `list_delete` — Destructive — https://policylayer.com/tools/54rt1n-container-mcp/list-delete.md
- `system_run_command` — Execute — https://policylayer.com/tools/54rt1n-container-mcp/system-run-command.md
- `system_run_python` — Execute — https://policylayer.com/tools/54rt1n-container-mcp/system-run-python.md
- `web_browse` — Execute — https://policylayer.com/tools/54rt1n-container-mcp/web-browse.md
- `fs_list` — Read — https://policylayer.com/tools/54rt1n-container-mcp/fs-list.md
- `fs_read` — Read — https://policylayer.com/tools/54rt1n-container-mcp/fs-read.md
- `health_check` — Read — https://policylayer.com/tools/54rt1n-container-mcp/health-check.md
- `kb_read` — Read — https://policylayer.com/tools/54rt1n-container-mcp/kb-read.md
- `kb_search` — Read — https://policylayer.com/tools/54rt1n-container-mcp/kb-search.md
- `list_get` — Read — https://policylayer.com/tools/54rt1n-container-mcp/list-get.md
- `list_search` — Read — https://policylayer.com/tools/54rt1n-container-mcp/list-search.md
- `market_query` — Read — https://policylayer.com/tools/54rt1n-container-mcp/market-query.md
- `rss_fetch` — Read — https://policylayer.com/tools/54rt1n-container-mcp/rss-fetch.md
- `system_env_var` — Read — https://policylayer.com/tools/54rt1n-container-mcp/system-env-var.md
- `web_scrape` — Read — https://policylayer.com/tools/54rt1n-container-mcp/web-scrape.md
- `web_search` — Read — https://policylayer.com/tools/54rt1n-container-mcp/web-search.md
- `fs_apply_diff` — Write — https://policylayer.com/tools/54rt1n-container-mcp/fs-apply-diff.md
- `fs_move` — Write — https://policylayer.com/tools/54rt1n-container-mcp/fs-move.md
- `fs_write` — Write — https://policylayer.com/tools/54rt1n-container-mcp/fs-write.md
- `kb_create_document` — Write — https://policylayer.com/tools/54rt1n-container-mcp/kb-create-document.md
- `kb_manage` — Write — https://policylayer.com/tools/54rt1n-container-mcp/kb-manage.md
- `kb_update_triples` — Write — https://policylayer.com/tools/54rt1n-container-mcp/kb-update-triples.md
- `kb_write_content` — Write — https://policylayer.com/tools/54rt1n-container-mcp/kb-write-content.md
- `list_create` — Write — https://policylayer.com/tools/54rt1n-container-mcp/list-create.md
- `list_modify` — Write — https://policylayer.com/tools/54rt1n-container-mcp/list-modify.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=54rt1n-container-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/54rt1n-container-mcp