compress_local_image · Test 1 MCP: Risk & Policy

WHAT IT DOES

What compress_local_image does on Test 1

AI agents use compress_local_image to create or update resources in Test 1 — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Test 1 environment.

WHY IT NEEDS A POLICY

Why compress_local_image needs a policy

Compression modifies a file in place or creates a compressed version, which is a reversible write operation. It does not delete or destroy data permanently, does not execute arbitrary code, and does not involve financial transactions. The blast radius is minimal as it only affects a local image file that the operator has intentionally specified.

From the tool's definition Tool name 'compress_local_image' and description 'Compress a local image file' indicates modification of an existing local file through compression (a reversible transformation).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

compress_local_image Rate-limited

compress_local_image 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": {
    "compress_local_image": {
      "limits": [
        {
          "counter": "compress_local_image_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Test 1, so you can run agents against it safely.

FAQ

Questions about compress_local_image

What does the compress_local_image tool do? +

Compress a local image file. It is categorised as a Write tool in the Test 1 MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on compress_local_image? +

Register the Test 1 MCP server in PolicyLayer and add a rule for compress_local_image: 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 Test 1. Nothing to install.

What risk level is compress_local_image? +

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

Can I rate-limit compress_local_image? +

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

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

compress_local_image is provided by the Test 1 MCP server (zhendi/tinypng-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.