Agent skill

Nexus Mapper

by Haaaiawd in Haaaiawd/Nexus-skills

Generate a persistent .nexus-map/ knowledge base that lets any AI session instantly understand a codebase's architecture, systems, dependencies, and change hotspots.

No licenceAuto-check: notesDevelopment

Install Nexus Mapper

skills CLI
$ npx skills add Haaaiawd/Nexus-skills --skill nexus-mapper -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install Haaaiawd/Nexus-skills nexus-mapper --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/Haaaiawd/Nexus-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/nexus-mapper .claude/skills/nexus-mapper && rm -rf skills-src

Use ~/.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/

Facts

Skill name
nexus-mapper
GitHub stars
166
Token cost
~2.5k tokens
SKILL.md length
347 words
Files
9 (incl. scripts, references)
Skills in repo
2
Repo updated
First seen
Licence
None found

At a glance

Generate a persistent .nexus-map/ knowledge base that lets any AI session instantly understand a codebase's architecture, systems, dependencies, and change hotspots.

  • Starting work on an unfamiliar repository
  • SKILL.md covers 何时调用 / 何时不调用, 前提检查, 输入契约 and 输出格式, plus 6 more sections
  • Runs Python scripts from its folder; calls python, pip and npm
  • Onboarding with AI-assisted context

What it does

Nexus Mapper is an agent skill from Haaaiawd/Nexus-skills. Generate a persistent .nexus-map/ knowledge base that lets any AI session instantly understand a codebase's architecture, systems, dependencies, and change hotspots. Use when starting work on an unfamiliar repository, onboarding with AI-assisted context, preparing for a major refactoring initiative, or enabling reliable cold-start AI sessions across a team. Produces INDEX.md, systems.md, conceptmodel.json, gitforensics.md and more. Requires shell execution and Python 3.10+. For ad-hoc file queries or instant…

Its SKILL.md is about 2.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 10 other files, including scripts and reference files (for example `references/language-customization.md`, `references/output-schema.md` and `references/probe-protocol.md`).

It sits in Development, covering Refactoring and Knowledge bases. It works with Python and Git. The repository describes itself as: AI-native codebase intelligence skills — generate persistent .nexus-map/ knowledge bases and instantly query file structure, dependency graphs, and change impact. Built for…

When your agent uses it

  • Starting work on an unfamiliar repository
  • Onboarding with AI-assisted context
  • Preparing for a major refactoring initiative
  • Enabling reliable cold-start AI sessions across a team

Example prompts

  • “/nexus-mapper”

Requirements

  • Python 3
  • Node.js
  • Docker

What it can do on your machine

Read from SKILL.md and the folder at commit 09d5601. 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 5 files in scripts/ (Python), which the agent can run.

    Shell commands in SKILL.md call:

    • python
    • pip
    • npm
    • pnpm
    • docker

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use pip, npm, pnpm and docker, which can reach the network depending on how they are called.

    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

Nexus Mapper loads about 2.5k tokens when it runs, and up to ~9.8k if it reads all its reference files. Until then it costs about 149 tokens; SKILL.md has 347 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~149
When it runs · the whole SKILL.md, loaded when a task matches
~2.5k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~9.8k

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: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NoteMentions a .env fileSKILL.md:218
    - 遇到 `.env`、密钥文件、凭据配置时:只记录其存在和用途,不抄出具体值

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 347 words (~2,528 tokens).

“本 Skill 指导 AI Agent 使用 PROBE 五阶段协议,对任意本地 Git 仓库执行系统性探测,产出 .nexus-map/ 分层知识库。”

— opening of SKILL.md by Haaaiawd
name
nexus-mapper

Read the full SKILL.md on GitHub

Files

SKILL.md and 8 other files (scripts, references) in skills/nexus-mapper of Haaaiawd/Nexus-skills.

  • SKILL.md
  • references/language-customization.md
  • references/output-schema.md
  • references/probe-protocol.md
  • scripts/extract_ast.py
  • scripts/git_detective.py
  • scripts/languages.json
  • scripts/query_graph.py
  • scripts/requirements.txt

Open the folder on GitHubat commit 09d5601

Compare with similar skills

Nexus Mapper 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.

Nexus Mapper compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Nexus Mapper this skillHaaaiawd/Nexus-skills166—~2.5kAutomated safety check: NotesNone
Adk Reviewgoogle/adk-python22k—~1.6kAutomated safety check: PassApache-2.0
Code RefinerMathews-Tom/armory328—~3.1kAutomated safety check: PassMIT
Acquire Codebase Knowledgegithub/awesome-copilot40k1 repos~2.3kAutomated safety check: PassMIT
Code Review ChecklistshareAI-lab/learn-claude-code78k5 repos~1.1kAutomated safety check: PassMIT
Codexskills-directory/skill-codex1.5k3 repos~1.8kAutomated safety check: PassMIT

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Works with

Questions about Nexus Mapper

What does Nexus Mapper do?

Generate a persistent .nexus-map/ knowledge base that lets any AI session instantly understand a codebase's architecture, systems, dependencies, and change hotspots. Nexus Mapper is an agent skill from Haaaiawd/Nexus-skills.nexus-map/ knowledge base that lets any AI session instantly understand a codebase's architecture, systems, dependencies, and change hotspots.

When should I use Nexus Mapper?

Nexus Mapper fits situations like: starting work on an unfamiliar repository; onboarding with AI-assisted context; preparing for a major refactoring initiative; enabling reliable cold-start AI sessions across a team.

How do I install Nexus Mapper in Claude Code?

Run `npx skills add Haaaiawd/Nexus-skills --skill nexus-mapper -a claude-code`. Or copy the skill folder (skills/nexus-mapper in Haaaiawd/Nexus-skills) into .claude/skills/nexus-mapper in your project. Claude Code loads it when a task matches its description.

How do I install Nexus Mapper in Codex?

Run `npx skills add Haaaiawd/Nexus-skills --skill nexus-mapper -a codex`. Or copy the skill folder (skills/nexus-mapper in Haaaiawd/Nexus-skills) into .agents/skills/nexus-mapper in your project. Codex loads it when a task matches its description.

Can I use Nexus Mapper 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 Haaaiawd/Nexus-skills --skill nexus-mapper -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/nexus-mapper, .gemini/skills/nexus-mapper, .github/skills/nexus-mapper and .opencode/skills/nexus-mapper in your project.

What does Nexus Mapper need to run?

Going by SKILL.md and its folder, Nexus Mapper needs Python for the scripts in its folder and the command-line tools its instructions call (python, pip, npm, pnpm and docker). Our summary lists: Python 3; Node.js; Docker.

Does Nexus Mapper access the network?

SKILL.md contains no URLs. Its commands use pip, npm and docker, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Nexus Mapper safe to install?

Our automated static check of SKILL.md found notes only (mentions a .env file), nothing it rates as a warning. 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 Nexus Mapper use?

No licence was found for Nexus Mapper or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Nexus Mapper use?

About 2.5k tokens (SKILL.md is roughly 10k 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 7.3k tokens, read only when the agent opens those files.

What are the alternatives to Nexus Mapper?

Skills that share tags, products or a category with Nexus Mapper: Adk Review (google/adk-python, 22k stars), Code Refiner (Mathews-Tom/armory, 328 stars), Acquire Codebase Knowledge (github/awesome-copilot, 40k stars) and Code Review Checklist (shareAI-lab/learn-claude-code, 78k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Nexus Mapper?

Haaaiawd (a GitHub user) maintains it in Haaaiawd/Nexus-skills, which has 166 GitHub stars. The repository holds 2 skills in this directory. The repository was last updated on March 31, 2026.

Source: Haaaiawd/Nexus-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.