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prompt-rejector

prompt-rejector is an MCP server for Claude Code from revsmoke/promptrejectormcp. Its token cost is not measured, scanned A, a copy of mem-lite, ISC.

An MCP server configuration for running Prompt Rejector, a tool that screens prompts and agent tool descriptions for security risks.

In plain words
What is it for?
Use it to connect an MCP client to Prompt Rejector for security checks.
Why use it?
It gives an MCP-compatible client the command needed to start the local server.

MCP server for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable. Also seen: listed in a Claude config.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the prompt-rejector plugin — 1 skill, 1 MCP server shipped together

not rated 2repo 1mo ago A scan tokens not measured copy · 86% ISC

Good fit Use it to connect an MCP client to Prompt Rejector for security checks.

Compare 6 mcp servers from other repositories ↓

Installing this writes the configuration, not the program: `node` runs a file from the repository, so clone it first and make the path in the command match where you put it.

View source ↗ revsmoke/promptrejectormcp
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add revsmoke/promptrejectormcp
Claude Code
/plugin install prompt-rejector

Installing this writes the configuration, not the program: `node` runs a file from the repository, so clone it first and make the path in the command match where you put it.

Made for: Claude Code.

Or install prompt-rejector, the plugin that ships this one along with the rest of its 1 skill, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for prompt-rejector

README.md
[![agentmods](https://agentmods.dev/badge/mcp/revsmoke/promptrejectormcp/prompt-rejector-prompt-rejector/github.svg)](https://agentmods.dev/mcp/revsmoke/promptrejectormcp/prompt-rejector-prompt-rejector)
Your own site
<a href="https://agentmods.dev/mcp/revsmoke/promptrejectormcp/prompt-rejector-prompt-rejector"><img src="https://agentmods.dev/badge/mcp/revsmoke/promptrejectormcp/prompt-rejector-prompt-rejector/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for prompt-rejector

Your own site · 80×15
<a href="https://agentmods.dev/mcp/revsmoke/promptrejectormcp/prompt-rejector-prompt-rejector"><img src="https://agentmods.dev/badge/mcp/revsmoke/promptrejectormcp/prompt-rejector-prompt-rejector.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 86% copy Near-identical to another mod in the catalogue.
Security

Grade A, and why

prompt-rejector scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

86% identical to mem-lite — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

plugins/prompt-rejector/.mcp.json · 8 lines

What it actually says

{
  "prompt-rejector": {
    "command": "node",
    "args": [
      "${CLAUDE_PLUGIN_ROOT}/scripts/launch.mjs"
    ]
  }
}
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 8 lines scan A c221fc5675a4

Subscribe to this mod's changes

prompt-rejector is an MCP server published in the GitHub repository revsmoke/promptrejectormcp (2 stars, last pushed 1mo ago), licensed ISC. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. It is 86% identical to mem-lite, differing in 2 lines, and is treated as a copy.

Claude CodeSecurityai-securityclaudecybersecuritygeminillm-safety
Related

prompt-rejector compared with mcp servers from other repositories

prompt-rejector next to 6 mcp servers from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
prompt-rejectorrevsmoke/promptrejectormcpMCP server21mo agoISCA—Claude Code
zugashieldZuga-Technologies/ZugaShieldMCP server13d agoMITA—Claude Code, Codex, Cursor, Gemini CLI, OpenCode
nullsec-redteam-aiPanda1847/NullSec-RedTeam-AIMCP server12mo agoMITA—Claude Code, Codex, Cursor, Gemini CLI, OpenCode
mcpstrikeente0/mcpstrikeMCP server142mo agoGPL-3.0A—Claude Code, Codex, Cursor, Gemini CLI, OpenCode
docs-langchainlangchain-ai/langchainMCP server149ktodayMITA—Claude Code, Codex, Cursor, Gemini CLI, OpenCode
component-explorermicrosoft/vscodeMCP server195ktodayMITA—Claude Code, Codex, Cursor, Gemini CLI, OpenCode
codex_message_boardopenai/codexMCP server134ktodayApache-2.0A—Claude Code, Codex, Cursor, Gemini CLI, OpenCode