post_emotion_vocab · Jikan MCP: Risk & Policy

WHAT IT DOES

What post_emotion_vocab does on Jikan

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

WHY IT NEEDS A POLICY

Why post_emotion_vocab needs a policy

This tool creates new entries in a vocabulary system. The 'post' action and 'add' verb clearly indicate a Write operation—it modifies data but is reversible (labels can be removed or edited). It poses minimal risk as it only extends a personal vocabulary without affecting external systems, financial obligations, or critical data integrity. Severity is low because misuse would have limited blast radius.

From the tool's definition Tool name 'post_emotion_vocab' and description 'Add a new state label to the agent's private vocabulary' indicate a create/add operation that modifies data (the vocabulary) in a reversible manner.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

post_emotion_vocab Rate-limited

post_emotion_vocab 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": {
    "post_emotion_vocab": {
      "limits": [
        {
          "counter": "post_emotion_vocab_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 Jikan, so you can run agents against it safely.

FAQ

Questions about post_emotion_vocab

What does the post_emotion_vocab tool do? +

Add a new state label to the agent's private vocabulary. It is categorised as a Write tool in the Jikan MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on post_emotion_vocab? +

Register the Jikan MCP server in PolicyLayer and add a rule for post_emotion_vocab: 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 Jikan. Nothing to install.

What risk level is post_emotion_vocab? +

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

Can I rate-limit post_emotion_vocab? +

Yes. Add a rate_limit block to the post_emotion_vocab 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 post_emotion_vocab completely? +

Set action: deny in the PolicyLayer policy for post_emotion_vocab. 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 post_emotion_vocab? +

post_emotion_vocab is provided by the Jikan MCP server (thunderrabbit/jikan). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.