# update_unit

Update an existing measurement unit in Mealie.

Agent View of the PolicyLayer registry record for `update_unit`. HTML page: https://policylayer.com/tools/nikopol666-mealie-mcp/update-unit

## Facts

- Tool: `update_unit`
- Server: Mealie MCP Server (`nikopol666/mealie-mcp`) — https://policylayer.com/tools/nikopol666-mealie-mcp.md
- Homepage: https://github.com/nikopol666/mealie-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": "update_unit",
    "arguments": {}
  }
}
```

## Why update_unit is rated Medium

This tool modifies existing data (measurement units) reversibly—updates can be undone by subsequent updates or restoration. It does not delete data irreversibly, execute arbitrary code, or move money. The impact is scoped to unit definitions, affecting potentially many recipes that reference those units, warranting medium severity for a misconfigured or unintended update.

From the tool's own definition: "Tool description states 'Update an existing measurement unit', which is a modification operation. The name 'update_unit' and description explicitly indicate changing existing data (a measurement unit) in the Mealie system."

## Use case

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

## Recommended policy (PolicyLayer)

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

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

## Other tools on Mealie MCP Server (242)

- `bulk_delete_recipes` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/bulk-delete-recipes.md
- `delete_admin_backup` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-admin-backup.md
- `delete_admin_group` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-admin-group.md
- `delete_admin_household` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-admin-household.md
- `delete_admin_user` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-admin-user.md
- `delete_category` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-category.md
- `delete_comment` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-comment.md
- `delete_cookbook` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-cookbook.md
- `delete_food` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-food.md
- `delete_group_label` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-group-label.md
- `delete_group_report` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-group-report.md
- `delete_household_notification` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-household-notification.md
- `delete_household_webhook` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-household-webhook.md
- `delete_meal_plan_entry` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-meal-plan-entry.md
- `delete_meal_plan_rule` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-meal-plan-rule.md
- `delete_recipe` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-recipe.md
- `delete_recipe_action` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-recipe-action.md
- `delete_recipe_image` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-recipe-image.md
- `delete_recipe_timeline_event` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-recipe-timeline-event.md
- `delete_recipe_tool` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-recipe-tool.md
- `delete_shared_recipe_record` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-shared-recipe-record.md
- `delete_shopping_item` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-shopping-item.md
- `delete_shopping_items` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-shopping-items.md
- `delete_shopping_list` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-shopping-list.md
- `delete_tag` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-tag.md
- `delete_unit` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-unit.md
- `delete_user_api_token` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-user-api-token.md
- `delete_user_favorite` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/delete-user-favorite.md
- `purge_recipe_exports` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/purge-recipe-exports.md
- `remove_recipe_from_shopping_list` — Destructive — https://policylayer.com/tools/nikopol666-mealie-mcp/remove-recipe-from-shopping-list.md
- …and 212 more: https://policylayer.com/tools/nikopol666-mealie-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=nikopol666-mealie-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/nikopol666-mealie-mcp