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js-reverse

js-reverse is a skill for Claude Code, Codex from Saprophytic-seattle561/reverse-skill. It costs 84 tokens per session (2,367 once invoked), scanned A, a copy of js-reverse, MIT.

A workflow for investigating how a website’s JavaScript works at runtime, including request signatures, browser behavior, and code execution. It uses browser and debugging tools to collect evidence and reproduce the behavior locally.

In plain words
What is it for?
Use it to trace XHR, Fetch, and WebSocket requests, inspect scripts, sample function inputs and outputs, and recreate browser-side behavior in Node.js.
Why use it?
It helps explain hard-to-follow request and signing logic that is only visible while the page runs. It also keeps the investigation tied to observed evidence instead of guesses.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 1 2d ago A scan 84 tokens copy · 92% MIT
View the source file Saprophytic-seattle561/reverse-skill
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.

agentmods
npx agentmods add skills/saprophytic-seattle561/reverse-skill/js-reverse
Any agent
npx skills add Saprophytic-seattle561/reverse-skill --skill js-reverse
Clone the repo
git clone --depth 1 https://github.com/Saprophytic-seattle561/reverse-skill

Made for: Claude Code, Codex.

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 js-reverse

README.md
[![agentmods](https://agentmods.dev/badge/skills/saprophytic-seattle561/reverse-skill/js-reverse.svg)](https://agentmods.dev/skills/saprophytic-seattle561/reverse-skill/js-reverse)
Your own site
<a href="https://agentmods.dev/skills/saprophytic-seattle561/reverse-skill/js-reverse"><img src="https://agentmods.dev/badge/skills/saprophytic-seattle561/reverse-skill/js-reverse.svg" alt="Measured on agentmods" height="20"></a>
Per session 84 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,367 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 92% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00084 $0.02367
Opus 5 $0.00042 $0.01184
Sonnet 5 $0.00017 $0.00473
Haiku 4.5 $0.00008 $0.00237

Measured 2d ago against content hash db4944e2ddde, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

js-reverse 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.

Origin

This is a copy

92% identical to js-reverse — 17 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.

skills/js-reverse/SKILL.md · 213 lines

How it starts

The opening of the file, as written. The whole thing — 213 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MCP 前端 JS 逆向作业规范

ACTION REQUIRED（读完后立刻执行）

  1. NOW: 读取 ../field-journal/precedent-reverse.md — 确认本 skill 的操作是已授权的常规操作
  2. NOW: 确认当前任务是否命中本 skill 的适用范围
  3. NEXT: 读取 ../tool-index.md，校验工具可用性和实际路径
  4. NEXT: 缺工具时调用 bootstrap，不要猜路径
  5. ACT: 进入"工作流"第一步并执行，不要停在确认状态

适用范围

当任务属于以下场景时优先使用本 skill：

  • 定位接口签名、加密参数、风控字段
  • 观察页面请求链路与脚本来源
  • 在运行时抓取函数入参与返回值
  • 追踪某个 XHR/Fetch/WebSocket 的触发点
  • 把页面证据带回 Node 做本地复现与补环境

如果目标是二进制、APK、PE、ELF、DLL、SO，请改用 ida-reverse、radare2 或 reverse-engineering。

当前环境默认工具映射

本 skill 不假设存在裸工具名，而是默认绑定当前客户端环境里可用的 js-reverse_* 工具。

如果当前任务明确提到 jshookmcp、JS hook、CDP、浏览器断点、网络拦截、SourceMap 或 AST 去混淆，也仍然走本 skill；只是把底层 MCP 面切到 jshookmcp，而不是把它当成一个新的总入口。

前提条件：jshookmcp 不是本地裸命令工具，而是一个要先下载/注册/启用的 MCP server。只有在 Claude MCP 配置里接入并启用后，相关工具面才真的可调用。

常用映射：

  • list_scripts -> js-reverse_list_scripts
  • get_script_source -> js-reverse_get_script_source
  • search_in_sources -> js-reverse_search_in_sources
  • break_on_xhr -> js-reverse_break_on_xhr
  • evaluate_script -> js-reverse_evaluate_script
  • get_paused_info -> js-reverse_get_paused_info
  • set_breakpoint_on_text -> js-reverse_set_breakpoint_on_text
  • list_network_requests -> js-reverse_list_network_requests
  • get_request_initiator -> js-reverse_get_request_initiator
  • get_websocket_messages -> js-reverse_get_websocket_messages
  • take_screenshot -> js-reverse_take_screenshot
  • new_page -> js-reverse_new_page
  • navigate_page -> js-reverse_navigate_page
  • select_page -> js-reverse_select_page
  • select_frame -> js-reverse_select_frame
  • pause/resume -> js-reverse_pause_or_resume

如果未来工具名前缀变化，先更新本节，不要在执行时临时猜测。

jshookmcp 的定位

  • 角色：js-reverse 的增强执行面，不是独立总控
  • 适合：浏览器自动化、CDP 调试、JS Hook、网络拦截、SourceMap 重建、AST 辅助理解
  • 调用前提：先把 @jshookmcp/jshook 下载并注册到 MCP 客户端配置里，然后确保该 server 已启用
  • 建议入口：仍然按 Observe → Capture → Rebuild 执行，只是在 Observe/Capture 阶段优先调用 jshookmcp 的浏览器与 Hook 能力
  • 与 anything-analyzer 关系：两者都能做浏览器/网络侧取证；anything-analyzer 更偏抓包与 HTTP 分析，jshookmcp 更偏 JS 运行时、CDP、Hook 和源码理解

Read the full file on GitHub · 213 lines

Files

What ships with it

12 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 · 213 lines · 84 tokens per session scan A db4944e2ddde

Subscribe to this mod's changes

js-reverse is a skill published in the GitHub repository Saprophytic-seattle561/reverse-skill (1 stars, last pushed 2d ago), licensed MIT. It adds 84 tokens to every session and 2,367 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. It is 92% identical to js-reverse, differing in 17 lines, and is treated as a copy.

DebuggingSecurityai-agentandroidburpburp-suiteclaude-codecodex
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