compress · Mcp Compress MCP: Risk & Policy

WHAT IT DOES

What compress does on Mcp Compress

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

WHY IT NEEDS A POLICY

Why compress needs a policy

This tool transforms input data into a compressed representation and returns it. It creates a new encoded artifact but does not delete, execute, or move money. It is reversible (lossless round-trip verified per server description), making it a Write-category operation. Blast radius is low since it only processes data provided to it and returns a result.

From the tool's definition Compress text/JSON/CSV data. Returns base64-encoded compressed data with compression ratio.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

compress Rate-limited

compress 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": {
      "limits": [
        {
          "counter": "compress_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 Mcp Compress, so you can run agents against it safely.

FAQ

Questions about compress

What does the compress tool do? +

Compress text/JSON/CSV data. Returns base64-encoded compressed data with compression ratio. Use algorithm=. It is categorised as a Write tool in the Mcp Compress 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? +

Register the Mcp Compress MCP server in PolicyLayer and add a rule for compress: 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 Mcp Compress. Nothing to install.

What risk level is compress? +

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

Can I rate-limit compress? +

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

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

compress is provided by the Mcp Compress MCP server (shipitandpray/mcp-compress). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.