store · Mcp Compress MCP: Risk & Policy

WHAT IT DOES

What store does on Mcp Compress

AI agents use store 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 store needs a policy

This tool writes data to disk in a key-value store fashion. It creates new entries or overwrites existing ones, which is a reversible Write operation (data can be deleted or overwritten). It does not execute code, delete data irreversibly, or involve financial transactions. Severity is medium because an agent could store arbitrary data to disk, potentially filling storage or overwriting existing keys.

From the tool's definition 'Compress data and store it to disk with a key' — writes compressed data to disk storage, retrievable later via key

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

store Rate-limited

store 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": {
    "store": {
      "limits": [
        {
          "counter": "store_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 store

What does the store tool do? +

Compress data and store it to disk with a key. Retrieve later with the key. Like a compressed key-value store for agents. 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 store? +

Register the Mcp Compress MCP server in PolicyLayer and add a rule for store: 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 store? +

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

Can I rate-limit store? +

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

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

store 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.