agentmods.dev

backend-validator

A collection of tools for checking backend APIs and WebSocket connections. It also handles OpenID Connect login tokens, which are credentials used by some modern applications.

In plain words
What is it for?
Use it to validate API requests, WebSocket handshakes and messages, authenticated access, and end-to-end backend behavior.
Why use it?
It helps test whether backend endpoints and live connections work correctly, including authentication, without checking each part manually.

Plugin for Claude Code

11 5d ago A scan tokens not measured original MIT
View the source file johnkozaris/jko-claude-plugins
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.

Claude Code
/plugin marketplace add johnkozaris/jko-claude-plugins
agentmods
npx agentmods add plugins/johnkozaris/jko-claude-plugins/backend-validator
Clone the repo
git clone --depth 1 https://github.com/johnkozaris/jko-claude-plugins

Made for: Claude Code.

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. Scan, not verified.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

backend-validator 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 2d 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.

plugins/backend-validator/.claude-plugin/plugin.json · 24 lines

What it actually says

{
  "name": "backend-validator",
  "description": "Backend API and WebSocket validation via Hurl, websocat, and oauth2c with OIDC token caching",
  "version": "1.2.0",
  "license": "MIT",
  "author": {
    "name": "John Kozaris"
  },
  "homepage": "https://github.com/johnkozaris/jko-claude-plugins",
  "repository": "https://github.com/johnkozaris/jko-claude-plugins",
  "keywords": [
    "validation",
    "e2e",
    "hurl",
    "websocat",
    "oauth2c",
    "oidc",
    "authentik",
    "api-testing",
    "websocket",
    "backend"
  ]
}
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. 2d ago First seen · 24 lines scan A 7e04117e5915

Subscribe to this mod's changes

backend-validator is a plugin published in the GitHub repository johnkozaris/jko-claude-plugins (11 stars, last pushed 5d ago), 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 2026-08-30.

Backend and APIsCode reviewLanguagesai-codingclaude-codeclaude-code-marketplaceclaude-code-pluginclaude-code-skills
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