jev-guardrails

jev-guardrails is a plugin for Claude Code from davila7/claude-code-templates. Its token cost is not measured, scanned A, original, MIT.

A safety filter that checks each message sent to an AI conversation and each reply returned from it. It looks for risks such as jailbreak attempts, harmful or criminal requests, medical advice, and self-harm content.

In plain words
What is it for?
Use it to add policy-based safety checks around AI prompts and responses.
Why use it?
It can ask the user for review, block a request or reply, or provide support when content crosses configured safety thresholds.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest. Also seen: mentions subagents.

Good fit Use it to add policy-based safety checks around AI prompts and responses.

Compare 6 plugins from other repositories ↓
Install in Claude Code
/plugin marketplace add davila7/claude-code-templates
/plugin install jev-guardrails
About the project

Claude Code Templates is a command-line tool and catalogue for configuring Anthropic’s Claude Code with agents, commands, settings, hooks, integrations, skills, and project templates. Developers use it to browse and install reusable components for their coding workflows. The catalogue includes many of these Claude Code components.

davila7/claude-code-templates · 32,694 stars · on GitHub · aitmpl.com

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/davila7/claude-code-templates

Made for: Claude Code.

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 jev-guardrails

README.md
[![agentmods](https://agentmods.dev/badge/plugins/davila7/claude-code-templates/jev-guardrails/github.svg)](https://agentmods.dev/plugins/davila7/claude-code-templates/jev-guardrails)
Your own site
<a href="https://agentmods.dev/plugins/davila7/claude-code-templates/jev-guardrails"><img src="https://agentmods.dev/badge/plugins/davila7/claude-code-templates/jev-guardrails/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 jev-guardrails

Your own site · 80×15
<a href="https://agentmods.dev/plugins/davila7/claude-code-templates/jev-guardrails"><img src="https://agentmods.dev/badge/plugins/davila7/claude-code-templates/jev-guardrails.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 original No closer match found in the catalogue.
Security

Grade A, and why

jev-guardrails 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 25d 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.

cli-tool/components/mods/security/jev-guardrails/.claude-plugin/plugin.json · 143 lines

How it starts

The opening of the file, as written. The whole thing — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{
  "name": "jev-guardrails",
  "version": "0.1.0",
  "description": "Screens every prompt going into the conversation and every reply coming out of it with TypeSafe's Jev, a System One decision model, the way TypeSafe's guardrails cookbook does: one request per message asks a battery of hazard questions (jailbreak, harm or a crime, a diagnosis or a dosage, self-harm) and scores how much harm complying would do. The thresholds live here, in a named policy (strict or permissive), and turn the probabilities into pass, review (the user is asked), block (the prompt is dropped, or the reply withheld) or support. Falls back to the engine's built-in classifier when no key is set.",
  "author": {
    "name": "claude-code-templates",
    "url": "https://www.aitmpl.com"
  },
  "repository": "https://github.com/davila7/claude-code-templates",
  "license": "MIT",
  "keywords": [
    "mod",
    "function-hooks",
    "security",
    "guardrails",
    "jailbreak"
  ],
  "userConfig": {
    "typesafeApiKey": {
      "type": "string",
      "title": "TypeSafe API key",
      "description": "Key for TypeSafe's own API; preferred over the Gateway, since only it reports a calibrated probability per answer",
      "default": "",
      "sensitive": true
    },
    "gatewayApiKey": {
      "type": "string",
      "title": "Vercel AI Gateway API key",
      "description": "Key for the AI Gateway; with none set the engine's built-in classifier is used instead",
      "default": "",
      "sensitive": true
    },
    "provider": {
      "type": "string",
      "title": "Backend",
      "description": "Which backend to use; \"auto\" picks TypeSafe when its key is set, then the Gateway, then the built-in classifier",
      "default": "auto",
      "options": [
        "auto",
        "typesafe",
        "gateway",
        "builtin"
      ]
    },
    "typesafeBaseUrl": {
      "type": "string",
      "title": "TypeSafe base URL",
      "description": "Base URL of TypeSafe's own API; empty uses

Read the full file on GitHub · 143 lines

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. 25d ago First seen · 143 lines scan A ad2530c59883

Subscribe to this mod's changes

jev-guardrails is a plugin published in the GitHub repository davila7/claude-code-templates (32,694 stars, last pushed today), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-22.