convert_format · Struct MCP: Risk & Policy

WHAT IT DOES

What convert_format does on Struct

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

WHY IT NEEDS A POLICY

Why convert_format needs a policy

The tool performs a format conversion operation, which is a data transformation that creates a modified version of existing data. This is a Write-class operation because it produces new output/data structure, but not Destructive since the conversion itself doesn't permanently delete or overwrite the original source data.

From the tool's definition Tool name 'convert_format' and description 'Convert structure to different format' indicate the tool modifies or transforms data from one representation to another without irreversibly deleting the original.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

convert_format Rate-limited

convert_format 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": {
    "convert_format": {
      "limits": [
        {
          "counter": "convert_format_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 Struct, so you can run agents against it safely.

FAQ

Questions about convert_format

What does the convert_format tool do? +

Convert structure to different format. It is categorised as a Write tool in the Struct MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on convert_format? +

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

What risk level is convert_format? +

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

Can I rate-limit convert_format? +

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

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

convert_format is provided by the Struct MCP server (laurears/struct-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.