add_heading · Wps MCP: Risk & Policy

WHAT IT DOES

What add_heading does on Wps

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

WHY IT NEEDS A POLICY

Why add_heading needs a policy

The tool modifies a document by adding a heading, which is a Create/Write operation. It is reversible (headings can be removed or edited) and does not delete, execute code, or trigger external operations.

From the tool's definition Tool name 'add_heading' and description 'Add a heading to an existing document' indicate a reversible modification operation that creates or modifies document content. This aligns with the Write category as defined: creates or modifies data reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_heading Rate-limited

add_heading 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_heading": {
      "limits": [
        {
          "counter": "add_heading_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 Wps, so you can run agents against it safely.

FAQ

Questions about add_heading

What does the add_heading tool do? +

Add a heading to an existing document. It is categorised as a Write tool in the Wps 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_heading? +

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

What risk level is add_heading? +

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

Can I rate-limit add_heading? +

Yes. Add a rate_limit block to the add_heading 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_heading completely? +

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

add_heading is provided by the Wps MCP server (xiao-rx/wps-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.