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.
npx agentmods add skills/prajwalsrinvas/claude-code-reverse-engineering/skillnpx skills add Prajwalsrinvas/claude-code-reverse-engineering --skill skillgit clone --depth 1 https://github.com/Prajwalsrinvas/claude-code-reverse-engineeringWhat 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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00044 | $0.02726 |
| Opus 5 | $0.00022 | $0.01363 |
| Sonnet 5 | $0.00009 | $0.00545 |
| Haiku 4.5 | $0.00004 | $0.00273 |
Grade A, and why
analyze-cc-feature 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.
How it starts
The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Analyze Claude Code Feature
Reverse engineer a specific feature in Claude Code's source code.
Terminology note: Claude Code's cli.js is minified (whitespace removed, identifiers shortened for size), NOT obfuscated (intentionally made hard to read with control flow flattening, string encryption, etc.). webcrack's --no-deobfuscate flag is used because there is no obfuscation to reverse. The output file is called deobfuscated.js by webcrack convention, but it is more accurately "unminified" source.
IMPORTANT: Use the task list (TaskCreate/TaskUpdate) to track progress through the pipeline. Create all tasks upfront, then work through them sequentially, marking each in_progress when starting and completed when done.
Pipeline
Create these tasks at the start:
- Acquire source — Extract cli.js from the installed native Bun binary
- Unminify — Run webcrack + prettier to produce readable source
- Locate the feature — Search for anchor strings to find the code
- Extract & annotate — Pull out the feature's code, rename identifiers inline
- Analyze — Document what the feature does step by step
- Write report — Produce a markdown report with evidence
- Self-reflect — Evaluate whether the skill itself should be updated
If the user says to skip steps (e.g., "unminified source already exists at X, skip steps 1-2"), create those tasks as completed immediately.
Step 1: Acquire source
Run scripts/extract-cli.sh to extract cli.js from the installed native binary. The script caches by version.
bash ~/.claude/skills/analyze-cc-feature/scripts/extract-cli.sh
Important — the source is no longer in the npm package. Since v2.1.113 the npm package (@anthropic-ai/claude-code) is a ~170 KB thin installer; the real CLI ships as a per-platform native Bun standalone executable (~250 MB) with the JavaScript embedded in its module graph. extract-cli.sh locates the installed binary (~/.local/share/claude/versions/<version> or $(which claude)) and runs scripts/extract-bun-cli.py to pull cli.js out of the binary's module graph. It also drops the sibling modules (a precompiled Bun bytecode blob and two Rust NAPI addons — image-processor.node, audio-capture.node) into /tmp/claude-code-npm/bun-modules/.
What ships with it
5 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.
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 · 167 lines · 44 tokens per session scan A 0c4326fa27de
analyze-cc-feature is a skill published in the GitHub repository Prajwalsrinvas/claude-code-reverse-engineering (2 stars, last pushed 2mo ago), licensed MIT. It adds 44 tokens to every session and 2,726 once invoked, about $0.0002 per session on Opus 5. 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.
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