add_tag_to_entry · MCP Auth MCP: Risk & Policy

WHAT IT DOES

What add_tag_to_entry does on MCP Auth

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

WHY IT NEEDS A POLICY

Why add_tag_to_entry needs a policy

This tool creates a relationship between a tag and an entry, modifying the entry's metadata reversibly. It is not destructive (no deletion), not financial, and does not execute arbitrary code. Classification as Write is appropriate because it creates or modifies data in a reversible manner.

From the tool's definition Tool description states 'Add a tag to an entry', which is a create/modify operation that associates metadata with an existing entry.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_tag_to_entry Rate-limited

add_tag_to_entry stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_tag_to_entry": {
      "limits": [
        {
          "counter": "add_tag_to_entry_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP Auth, so you can run agents against it safely.

FAQ

Questions about add_tag_to_entry

What does the add_tag_to_entry tool do? +

Add a tag to an entry. It is categorised as a Write tool in the MCP Auth MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_tag_to_entry? +

Register the MCP Auth MCP server in PolicyLayer and add a rule for add_tag_to_entry: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MCP Auth. Nothing to install.

What risk level is add_tag_to_entry? +

add_tag_to_entry is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit add_tag_to_entry? +

Yes. Add a rate_limit block to the add_tag_to_entry rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block add_tag_to_entry completely? +

Set action: deny in the PolicyLayer policy for add_tag_to_entry. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides add_tag_to_entry? +

add_tag_to_entry is provided by the MCP Auth MCP server (rubenpenap/mcp-auth). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.