save_prompt · PromptingBox MCP Server MCP: Risk & Policy

WHAT IT DOES

What save_prompt does on PromptingBox MCP Server

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

WHY IT NEEDS A POLICY

Why save_prompt needs a policy

This tool creates or modifies stored prompts reversibly. It is Write rather than Read (no query-only operation) or Destructive (no irreversible deletion). Severity is medium because misuse could create numerous stored prompts or overwrite existing ones, but the impact is confined to prompt storage and reversible.

From the tool's definition Tool name 'save_prompt' and description 'Save a prompt to the user' directly indicates creation/modification of prompt data. Sibling tools include 'delete_prompt' and 'duplicate_prompt', confirming this server manages persistent prompt storage.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

save_prompt Rate-limited

save_prompt 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_prompt": {
      "limits": [
        {
          "counter": "save_prompt_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 PromptingBox MCP Server, so you can run agents against it safely.

FAQ

Questions about save_prompt

What does the save_prompt tool do? +

Save a prompt to the user\. It is categorised as a Write tool in the PromptingBox 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_prompt? +

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

What risk level is save_prompt? +

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

Can I rate-limit save_prompt? +

Yes. Add a rate_limit block to the save_prompt 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_prompt completely? +

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

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