set_essence_msg

Set essence message

SERVERNapCat MCP Server SOURCE1021143806/napcat_mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/1021143806-napcat-mcp/set-essence-msg.md

WHAT IT DOES

What set_essence_msg does on NapCat MCP Server

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

RISK

Why set_essence_msg is rated Medium

Setting an essence message modifies group state by marking a message as essential/pinned, but this is reversible—the essence status can be removed. This is not destructive (not irreversible deletion), not execute (not running arbitrary code), and not financial.

From the tool's definition Tool name 'set_essence_msg' and description 'Set essence message' indicate a modification operation on message data within a QQ group. This creates or modifies the 'essence' (pinned/highlighted) status of messages, which is a reversible change to group data.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_essence_msg safely

PolicyLayer is an MCP gateway: it sits between your AI agents and NapCat MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For set_essence_msg, this is the rule to start with:

set_essence_msg Rate-limited

set_essence_msg 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": {
    "set_essence_msg": {
      "limits": [
        {
          "counter": "set_essence_msg_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect NapCat MCP Server, apply this rule, and every set_essence_msg call is checked against it from then on.

FAQ

Questions about set_essence_msg

What does the set_essence_msg tool do? +

Set essence message. It is categorised as a Write tool in the NapCat MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_essence_msg? +

Register the NapCat MCP Server MCP server in PolicyLayer and add a rule for set_essence_msg: 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 NapCat MCP Server. Nothing to install.

What risk level is set_essence_msg? +

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

Can I rate-limit set_essence_msg? +

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

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

set_essence_msg is provided by the NapCat MCP Server MCP server (1021143806/napcat_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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