save_prd · My First MCP Server MCP: Risk & Policy

WHAT IT DOES

What save_prd does on My First MCP Server

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

WHY IT NEEDS A POLICY

Why save_prd needs a policy

This tool creates or modifies files in the /docs directory, which is a reversible write operation. It doesn't delete data (not Destructive), execute arbitrary code (not Execute), or move money (not Financial). The severity is medium because uncontrolled file writes could overwrite documentation or fill disk space, but the blast radius is limited to a docs folder rather than critical system resources.

From the tool's definition Tool description explicitly states 'Save generated PRD content to /docs folder' — a create/write operation that modifies the filesystem by persisting data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

save_prd Rate-limited

save_prd 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": {
    "save_prd": {
      "limits": [
        {
          "counter": "save_prd_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 My First MCP Server, so you can run agents against it safely.

FAQ

Questions about save_prd

What does the save_prd tool do? +

Save generated PRD content to /docs folder. It is categorised as a Write tool in the My First 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 save_prd? +

Register the My First MCP Server MCP server in PolicyLayer and add a rule for save_prd: 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 My First MCP Server. Nothing to install.

What risk level is save_prd? +

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

Can I rate-limit save_prd? +

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

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

save_prd is provided by the My First MCP Server MCP server (sethdavis512/my-first-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.