A review step for checking an AI coding agent's plan before it changes code. It can show plan versions, differences, feedback, and edits.

It is for reviewing, commenting on, and refining an agent's coding plan before implementation.

It helps catch misunderstandings or unwanted work before they become code changes.

planx — Plugin by thisisnsh

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 thisisnsh/planx

agentmods

npx agentmods add plugins/thisisnsh/planx/marketplace

Clone the repo

git clone --depth 1 https://github.com/thisisnsh/planx

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

planx 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.

.claude-plugin/marketplace.json · 35 lines

What it actually says

{
  "name": "planx",
  "owner": {
    "name": "thisisnsh",
    "url": "https://github.com/thisisnsh"
  },
  "description": "PlanX — review an AI agent's plan before it writes any code.",
  "plugins": [
    {
      "name": "planx",
      "source": "./",
      "description": "A planning skill for Claude Code, Codex and other AI coding agents, plus a terminal interface for reviewing plans with versions, diffs, inline feedback and direct edits.",
      "version": "0.13.0",
      "author": {
        "name": "thisisnsh",
        "url": "https://github.com/thisisnsh"
      },
      "homepage": "https://github.com/thisisnsh/planx/wiki",
      "repository": "https://github.com/thisisnsh/planx",
      "license": "MIT",
      "category": "productivity",
      "keywords": [
        "claude-code",
        "codex",
        "planning",
        "plan-review",
        "code-review",
        "ai-agent",
        "agentic-coding",
        "developer-tools"
      ]
    }
  ]
}

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.

2d ago First seen · 35 lines scan A 7dac75c608fa

Subscribe to this mod's changes

planx is a plugin published in the GitHub repository thisisnsh/planx (5 stars, last pushed 3d 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 2026-08-31.

Code review Planning agentic-coding ai-agents claude-code claude-skills codex-skills tui-app

planx

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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