refine_and_add_prompt

THE RISK

Medium Risk

Why refine_and_add_prompt needs a policy

This tool creates or modifies data in the prompt registry (the refined prompt is stored/added). This is a reversible operation consistent with Write category. It does not execute arbitrary code, delete data irreversibly, or handle financial transactions.

From the tool's definition Tool description states it 'adds the refined version to the registry,' which is a create/modify operation on stored prompt data. The sibling tools include 'add_prompt' and 'update_prompt', confirming this server manages data modification.

Documented attack patterns abuse exactly the kind of access refine_and_add_prompt gives an agent:

POLICY

How to control refine_and_add_prompt

PolicyLayer is an MCP gateway — it sits between your AI agents and Prompt Registry MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for refine_and_add_prompt:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "refine_and_add_prompt": {
      "limits": [
        {
          "counter": "refine_and_add_prompt_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

refine_and_add_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.

Create a free account and register Prompt Registry MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More Prompt Registry MCP tools

Destructive delete_prompt Deletes a prompt from the project-specific directory. If a user global default with the sa Write load_default_prompts Loads all default prompts from the default_prompts_data directory into the active prompt d Write add_prompt Adds a new prompt to the project-specific prompt directory. Write update_prompt Updates an existing prompt. Updates are always written to the project-specific directory, Read filter_prompts_by_tags Lists active prompts (project-specific or user global defaults) that match all specified t Read get_prompt_file_content Retrieves the raw JSON definition of the active prompt (project-specific or user global de

All 7 Prompt Registry MCP tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about refine_and_add_prompt

What does the refine_and_add_prompt tool do? +

Optimizes a prompt using Claude Prompt Optimizer techniques, then adds the refined version to the registry. It is categorised as a Write tool in the Prompt Registry MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on refine_and_add_prompt? +

Register the Prompt Registry MCP server in PolicyLayer and add a rule for refine_and_add_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 Prompt Registry MCP. Nothing to install.

What risk level is refine_and_add_prompt? +

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

Can I rate-limit refine_and_add_prompt? +

Yes. Add a rate_limit block to the refine_and_add_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 refine_and_add_prompt completely? +

Set action: deny in the PolicyLayer policy for refine_and_add_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 refine_and_add_prompt? +

refine_and_add_prompt is provided by the Prompt Registry MCP server (stevengonsalvez/promptregistry-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Prompt Registry MCP tool call.

Start from Prompt Registry MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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