secrets.put · MCP Fullstack MCP: Risk & Policy

WHAT IT DOES

What secrets.put does on MCP Fullstack

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

WHY IT NEEDS A POLICY

Why secrets.put needs a policy

This tool writes/stores a secret value (e.g., API keys, passwords, credentials) into a secrets management system. It creates or updates sensitive data reversibly. Misuse by an AI agent could result in overwriting critical secrets or storing malicious values, making severity high.

From the tool's definition Store a secret value

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

secrets.put Rate-limited

secrets.put 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": {
    "secrets.put": {
      "limits": [
        {
          "counter": "secrets.put_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 Fullstack, so you can run agents against it safely.

FAQ

Questions about secrets.put

What does the secrets.put tool do? +

Store a secret value. It is categorised as a Write tool in the MCP Fullstack MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on secrets.put? +

Register the MCP Fullstack MCP server in PolicyLayer and add a rule for secrets.put: 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 Fullstack. Nothing to install.

What risk level is secrets.put? +

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

Can I rate-limit secrets.put? +

Yes. Add a rate_limit block to the secrets.put 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 secrets.put completely? +

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

secrets.put is provided by the MCP Fullstack MCP server (jacobfv/mcp-fullstack). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.