MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Inspect embedded or packaged CPython processes at runtime by tracing child processes, acquiring the GIL, injecting Python, replacing builtins.input, walking frame.fback, exporting frame code…
No licenceAuto-check passed
Install Cpython Runtime Introspection
$ npx skills add manyuegong33/r0crawl_skills --skill cpython-runtime-introspection -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install manyuegong33/r0crawl_skills cpython-runtime-introspection --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/manyuegong33/r0crawl_skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/cpython-runtime-introspection .claude/skills/cpython-runtime-introspection && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "cpython-runtime-introspection" agent skill from https://github.com/manyuegong33/r0crawl_skills/tree/main/skills/cpython-runtime-introspection into .claude/skills/cpython-runtime-introspection/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cpython-runtime-introspection", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/manyuegong33/r0crawl_skills/tree/main/skills/cpython-runtime-introspectionType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add manyuegong33/r0crawl_skills --skill cpython-runtime-introspection -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install manyuegong33/r0crawl_skills cpython-runtime-introspection --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/manyuegong33/r0crawl_skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/cpython-runtime-introspection .agents/skills/cpython-runtime-introspection && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "cpython-runtime-introspection" agent skill from https://github.com/manyuegong33/r0crawl_skills/tree/main/skills/cpython-runtime-introspection into .agents/skills/cpython-runtime-introspection/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cpython-runtime-introspection", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add manyuegong33/r0crawl_skills --skill cpython-runtime-introspection -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install manyuegong33/r0crawl_skills cpython-runtime-introspection --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/manyuegong33/r0crawl_skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/cpython-runtime-introspection .cursor/skills/cpython-runtime-introspection && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "cpython-runtime-introspection" agent skill from https://github.com/manyuegong33/r0crawl_skills/tree/main/skills/cpython-runtime-introspection into .cursor/skills/cpython-runtime-introspection/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cpython-runtime-introspection", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/manyuegong33/r0crawl_skills.git --path skills/cpython-runtime-introspection--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add manyuegong33/r0crawl_skills --skill cpython-runtime-introspection -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install manyuegong33/r0crawl_skills cpython-runtime-introspection --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/manyuegong33/r0crawl_skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/cpython-runtime-introspection .gemini/skills/cpython-runtime-introspection && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "cpython-runtime-introspection" agent skill from https://github.com/manyuegong33/r0crawl_skills/tree/main/skills/cpython-runtime-introspection into .gemini/skills/cpython-runtime-introspection/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cpython-runtime-introspection", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install manyuegong33/r0crawl_skills cpython-runtime-introspectionInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add manyuegong33/r0crawl_skills --skill cpython-runtime-introspection -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/manyuegong33/r0crawl_skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/cpython-runtime-introspection .github/skills/cpython-runtime-introspection && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "cpython-runtime-introspection" agent skill from https://github.com/manyuegong33/r0crawl_skills/tree/main/skills/cpython-runtime-introspection into .github/skills/cpython-runtime-introspection/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cpython-runtime-introspection", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add manyuegong33/r0crawl_skills --skill cpython-runtime-introspection -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install manyuegong33/r0crawl_skills cpython-runtime-introspection --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/manyuegong33/r0crawl_skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/cpython-runtime-introspection .opencode/skills/cpython-runtime-introspection && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "cpython-runtime-introspection" agent skill from https://github.com/manyuegong33/r0crawl_skills/tree/main/skills/cpython-runtime-introspection into .opencode/skills/cpython-runtime-introspection/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cpython-runtime-introspection", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
cpython-runtime-introspection- GitHub stars
- 306
- Token cost
- ~537 tokens
- SKILL.md length
- 215 words
- Files
- 4 (incl. scripts, references)
- Skills in repo
- 9
- Repo updated
- First seen
- Licence
- None found
At a glance
Inspect embedded or packaged CPython processes at runtime by tracing child processes, acquiring the GIL, injecting Python, replacing builtins.input, walking frame.fback, exporting frame code…
- Works in 4 steps: Handle one-file parent and child… → Record module bases and the exact Python… → Capture an input or output stack and… → …
- Static extraction misses executed logic
- SKILL.md covers Prove the process and runtime, Prefer semantic injection, Walk caller frames and Fallback boundaries, plus 1 more section
- Runs Python scripts from its folder
What it does
Cpython Runtime Introspection is an agent skill from manyuegong33/r0crawl_skills. Inspect embedded or packaged CPython processes at runtime by tracing child processes, acquiring the GIL, injecting Python, replacing builtins.input, walking frame.fback, exporting frame code objects, locals, globals, and disassembly, and hooking PyEval or marshal boundaries. Use when static extraction misses executed logic or when Python behavior is visible only in memory.
Its SKILL.md is about 540 tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including scripts and reference files (for example `agents/openai.yaml`, `references/injection-boundaries.md` and `scripts/frame_probe.py`).
It works with Python. The repository describes itself as: r0crawlskills is a massive reverse-engineering skill arsenal for web, Android, iOS, Frida, native binaries, protocols, malware, firmware, and anti-analysis—built for beginners…
When your agent uses it
- Static extraction misses executed logic
- Python behavior is visible only in memory
Example prompts
- “/cpython-runtime-introspection”
Requirements
- Python 3
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- Handle one-file parent and child processes separately.
- Record module bases and the exact Python version.
- Capture an input or output stack and confirm it enters CPython.
- Match injector and target architecture.
What it can do on your machine
Read from SKILL.md and the folder at commit b9eb545. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (Python), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Cpython Runtime Introspection loads about 537 tokens when it runs, and up to ~772 if it reads all its reference files. Until then it costs about 102 tokens; SKILL.md has 215 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 215 words (~537 tokens).
“Inject Python-level code instead of reverse engineering the evaluator first:”
- name
- cpython-runtime-introspection
Files
SKILL.md and 3 other files (scripts, references) in skills/cpython-runtime-introspection of manyuegong33/r0crawl_skills.
- SKILL.md
- agents/openai.yaml
- references/injection-boundaries.md
- scripts/frame_probe.py
Open the folder on GitHubat commit b9eb545
Compare with similar skills
Cpython Runtime Introspection next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Cpython Runtime Introspection this skillmanyuegong33/r0crawl_skills | 306 | — | ~537 | Automated safety check: Pass | None | |
| MCP Server Builderanthropics/skills | 180k | 64 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| PDF Processinganthropics/skills | 180k | 48 repos | ~2k | Automated safety check: Pass | Proprietary | |
| NotebookLM Research AssistantPleasePrompto/notebooklm-skill | 7.8k | 14 repos | ~2.4k | Automated safety check: Notes | MIT | |
| Manim Video Productionbrowser-use/video-use | 28k | 6 repos | ~3k | Automated safety check: Pass | MIT | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 5 repos | ~1.1k | Automated safety check: Pass | MIT |
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Related
Works with
Questions about Cpython Runtime Introspection
What does Cpython Runtime Introspection do?
Inspect embedded or packaged CPython processes at runtime by tracing child processes, acquiring the GIL, injecting Python, replacing builtins.input, walking frame.fback, exporting frame code…. Cpython Runtime Introspection is an agent skill from manyuegong33/r0crawl_skills.fback, exporting frame code objects, locals, globals, and disassembly, and hooking PyEval or marshal boundaries.
When should I use Cpython Runtime Introspection?
Cpython Runtime Introspection fits situations like: static extraction misses executed logic; Python behavior is visible only in memory.
How do I install Cpython Runtime Introspection in Claude Code?
Run `npx skills add manyuegong33/r0crawl_skills --skill cpython-runtime-introspection -a claude-code`. Or copy the skill folder (skills/cpython-runtime-introspection in manyuegong33/r0crawl_skills) into .claude/skills/cpython-runtime-introspection in your project. Claude Code loads it when a task matches its description.
How do I install Cpython Runtime Introspection in Codex?
Run `npx skills add manyuegong33/r0crawl_skills --skill cpython-runtime-introspection -a codex`. Or copy the skill folder (skills/cpython-runtime-introspection in manyuegong33/r0crawl_skills) into .agents/skills/cpython-runtime-introspection in your project. Codex loads it when a task matches its description.
Can I use Cpython Runtime Introspection in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add manyuegong33/r0crawl_skills --skill cpython-runtime-introspection -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cpython-runtime-introspection, .gemini/skills/cpython-runtime-introspection, .github/skills/cpython-runtime-introspection and .opencode/skills/cpython-runtime-introspection in your project.
What does Cpython Runtime Introspection need to run?
Going by SKILL.md and its folder, Cpython Runtime Introspection needs Python for the scripts in its folder. Our summary lists: Python 3.
Does Cpython Runtime Introspection access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Cpython Runtime Introspection safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Cpython Runtime Introspection use?
No licence was found for Cpython Runtime Introspection or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Cpython Runtime Introspection use?
About 537 tokens (SKILL.md is roughly 2.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 235 tokens, read only when the agent opens those files.
What are the alternatives to Cpython Runtime Introspection?
Skills that share tags, products or a category with Cpython Runtime Introspection: MCP Server Builder (anthropics/skills, 180k stars), PDF Processing (anthropics/skills, 180k stars), NotebookLM Research Assistant (PleasePrompto/notebooklm-skill, 7.8k stars) and Manim Video Production (browser-use/video-use, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Cpython Runtime Introspection?
manyuegong33 (a GitHub user) maintains it in manyuegong33/r0crawl_skills, which has 306 GitHub stars. The repository holds 9 skills in this directory. The repository was last updated on September 20, 2026.
Source: manyuegong33/r0crawl_skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.