add_formula · Wps MCP: Risk & Policy

WHAT IT DOES

What add_formula does on Wps

AI agents use add_formula 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_formula needs a policy

The tool creates or modifies data in a spreadsheet cell. While formulas can reference other cells and produce calculated results, the action itself is reversible—formulas can be edited or deleted. This does not execute arbitrary code or shell commands (which would be Execute), nor does it irreversibly delete data (which would be Destructive).

From the tool's definition Tool name is 'add_formula' and description states 'Add a formula to a cell.' This modifies spreadsheet data by inserting a formula, which is a reversible Write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_formula Rate-limited

add_formula 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_formula": {
      "limits": [
        {
          "counter": "add_formula_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_formula

What does the add_formula tool do? +

Add a formula to a cell. 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_formula? +

Register the Wps MCP server in PolicyLayer and add a rule for add_formula: 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_formula? +

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

Can I rate-limit add_formula? +

Yes. Add a rate_limit block to the add_formula 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_formula completely? +

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

add_formula 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.