store_secret · Sirr MCP Server MCP: Risk & Policy

WHAT IT DOES

What store_secret does on Sirr MCP Server

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

WHY IT NEEDS A POLICY

Why store_secret needs a policy

This tool writes a new secret to the Sirr vault. It is a Write operation (creating new data). The severity is high because secrets/credentials stored via this tool could be sensitive (API keys, passwords, tokens), and misuse could lead to storing malicious or unauthorized secrets in the vault, or exposing sensitive data if stored incorrectly.

From the tool's definition 'Store a secret in Sirr. Returns a hash and URL.' - creates/stores new secret data in the vault

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

store_secret Rate-limited

store_secret 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_secret": {
      "limits": [
        {
          "counter": "store_secret_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 Sirr MCP Server, so you can run agents against it safely.

FAQ

Questions about store_secret

What does the store_secret tool do? +

Store a secret in Sirr. Returns a hash and URL. It is categorised as a Write tool in the Sirr MCP Server 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_secret? +

Register the Sirr MCP Server MCP server in PolicyLayer and add a rule for store_secret: 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 Sirr MCP Server. Nothing to install.

What risk level is store_secret? +

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

Can I rate-limit store_secret? +

Yes. Add a rate_limit block to the store_secret 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_secret completely? +

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

store_secret is provided by the Sirr MCP Server MCP server (sirrlock/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.