Agent skill

Code Communities

Detects architectural clusters and coupling boundaries via community detection on the code graph.

MITAuto-check passedDevelopment

Install Code Communities

skills CLI

$ npx skills add athola/claude-night-market --skill code-communities -a claude-code

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

GitHub CLI

$ gh skill install athola/claude-night-market code-communities --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/athola/claude-night-market.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/cartograph/skills/code-communities .claude/skills/code-communities && 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/

Paste into Claude Code

Install the "code-communities" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/cartograph/skills/code-communities into .claude/skills/code-communities/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-communities", 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

$skill-installer install https://github.com/athola/claude-night-market/tree/master/plugins/cartograph/skills/code-communities

Type 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.

skills CLI

$ npx skills add athola/claude-night-market --skill code-communities -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install athola/claude-night-market code-communities --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/cartograph/skills/code-communities .agents/skills/code-communities && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "code-communities" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/cartograph/skills/code-communities into .agents/skills/code-communities/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-communities", 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.

skills CLI

$ npx skills add athola/claude-night-market --skill code-communities -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install athola/claude-night-market code-communities --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/cartograph/skills/code-communities .cursor/skills/code-communities && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "code-communities" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/cartograph/skills/code-communities into .cursor/skills/code-communities/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-communities", 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

$ gemini skills install https://github.com/athola/claude-night-market.git --path plugins/cartograph/skills/code-communities

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add athola/claude-night-market --skill code-communities -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install athola/claude-night-market code-communities --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/cartograph/skills/code-communities .gemini/skills/code-communities && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "code-communities" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/cartograph/skills/code-communities into .gemini/skills/code-communities/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-communities", 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.

GitHub CLI

$ gh skill install athola/claude-night-market code-communities

Installs 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).

skills CLI

$ npx skills add athola/claude-night-market --skill code-communities -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/cartograph/skills/code-communities .github/skills/code-communities && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "code-communities" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/cartograph/skills/code-communities into .github/skills/code-communities/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-communities", 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.

skills CLI

$ npx skills add athola/claude-night-market --skill code-communities -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install athola/claude-night-market code-communities --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/cartograph/skills/code-communities .opencode/skills/code-communities && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "code-communities" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/cartograph/skills/code-communities into .opencode/skills/code-communities/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-communities", 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: code-communities
GitHub stars: 342
Used in: 1 other repo
Token cost: ~959 tokens
SKILL.md length: 268 words
Files: 1
Skills in repo: 159
Repo updated: Oct 6, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Detects architectural clusters and coupling boundaries via community detection on the code graph.

Works in 5 steps: Run community detection (requires… → Display clusters → Show coupling warnings: If communities… → …
Identifying module groupings
SKILL.md covers When NOT To Use, Prerequisites, Steps and Algorithm, plus 1 more section
Calls python3 and rg

What it does

Code Communities is an agent skill from athola/claude-night-market. Detects architectural clusters and coupling boundaries via community detection on the code graph. Use when identifying module groupings or refactoring targets.

Its SKILL.md is about 960 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Refactoring. It works with Mermaid. The repository describes itself as: 23 Claude Code plugins: TDD enforcement hooks, git/PR workflows, spec-driven development, code review, project lifecycle, fix-from-error, maintenance automation, context… The licence is MIT.

When your agent uses it

Identifying module groupings
Refactoring targets

Example prompts

“Use the code-communities skill to detect architectural clusters and coupling boundaries via community detection on the code graph”
“/code-communities”

Requirements

Python 3

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

Run community detection (requires gauntlet)
Display clusters
Show coupling warnings: If communities have
Generate Mermaid diagram
Suggest improvements

What it can do on your machine

Read from SKILL.md and the folder at commit 9f3eb00. 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
Shell commands in SKILL.md call:
- python3
- rg
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

Code Communities loads about 959 tokens when it runs. Until then it costs about 44 tokens; SKILL.md has 268 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~44
When it runs · the whole SKILL.md, loaded when a task matches: ~959

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); files beside SKILL.md are not scanned.

SKILL.md

The full file from athola/claude-night-market at commit 9f3eb00, republished under its MIT licence (© athola). 268 words, ~959 tokens.

Download SKILL.mdSave it as .claude/skills/code-communities/SKILL.md (or your agent's skills folder).

name: code-communities
description: Detects architectural clusters and coupling boundaries via community detection on the code graph. Use when identifying module groupings or refactoring targets.

Code Community Detection

Identify architectural clusters and module boundaries in the codebase.

When NOT To Use

One module's imports (use cartograph:dependency-graph)
Rendering an architecture already decided (use cartograph:architecture-diagram)

Prerequisites

This skill requires the gauntlet plugin for graph data. Discover it:

bash

GRAPH_QUERY=$(find ~/.claude/plugins -name "graph_query.py" -path "*/gauntlet/*" 2>/dev/null | head -1)

If gauntlet is not installed: Fall back to directory structure analysis. Group files by directory and use import statements to identify module boundaries. Generate a Mermaid diagram from directory-level relationships.

If installed but no graph.db: Tell the user to run /gauntlet-graph build.

Steps

Run community detection (requires gauntlet):

bash

python3 "$GRAPH_QUERY" --action communities

Fallback (no gauntlet): Analyze directory structure and cross-directory imports:

bash

# Directory-level grouping
find . -name "*.py" -not -path "*/node_modules/*" | \
    sed 's|/[^/]*$||' | sort | uniq -c | sort -rn

# Cross-directory imports (rg preferred, grep fallback)
if command -v rg &>/dev/null; then
  rg "^from |^import " --type py -l . | \
    xargs -I{} rg "^from \w+ import|^import \w+" {} --no-filename
else
  grep -rh "^from \|^import " --include="*.py" .
fi | sort | uniq -c | sort -rn | head -20

Group by top-level directories and count cross-directory imports to estimate coupling.

Display clusters:

Community         | Nodes | Cohesion | Description
auth              |    12 |    0.85  | Authentication module
db                |     8 |    0.92  | Database access layer
api/handlers      |    15 |    0.71  | API request handlers
utils             |     6 |    0.45  | Shared utilities

Show coupling warnings: If communities have

10 cross-boundary edges, highlight them:

WARNING: High coupling between 'auth' and 'api/handlers'
(23 cross-community edges, severity: high)

Generate Mermaid diagram:

mermaid

flowchart TB
  subgraph auth[Auth Module - cohesion 0.85]
    verify_token
    check_permissions
  end
  subgraph db[DB Layer - cohesion 0.92]
    execute_query
    connection_pool
  end
  auth -->|"23 edges"| api
  db -->|"5 edges"| api

Suggest improvements:
- Low cohesion (<0.5): "Consider splitting this module into more focused components"
- High coupling (>20 edges): "Consider introducing an interface to reduce direct dependencies"

Show full SKILL.md (114 more words)Show less

Algorithm

Uses the Leiden algorithm (when igraph is available) with edge-type-specific weights. Falls back to file-based grouping otherwise.

Edge Type	Weight
CALLS	1.0
INHERITS	0.8
IMPLEMENTS	0.7
IMPORTS_FROM	0.5
TESTED_BY	0.4
CONTAINS	0.3

Exit Criteria

Community table rendered with columns Community, Nodes, Cohesion, and Description for each detected cluster
Coupling warning surfaced for any pair of communities with more than 10 cross-boundary edges, labelled with severity
Mermaid flowchart TB generated with one subgraph per community showing cohesion score in the subgraph label
Improvement suggestions provided for any community with cohesion < 0.5 or coupling > 20 cross-community edges
If gauntlet is not installed, directory-structure fallback runs and absence of graph data is stated to the user

Files

Just SKILL.md in plugins/cartograph/skills/code-communities of athola/claude-night-market.

Open the folder on GitHubat commit 9f3eb00

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in athola/claude-night-market, which our catalogue first saw on October 7, 2026.

majiayu000/claude-skill-registryskills/analysis/code-communities

Compare with similar skills

Code Communities 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.

Code Communities compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Code Communities this skillathola/claude-night-market	342	1 repos	~959	Automated safety check: Pass	MIT	2 days ago
Brooks Audithyhmrright/brooks-lint	1.5k	1 repos	~537	Automated safety check: Pass	MIT	3 days ago
Guidelinesakash-network/node	1.1k	22 repos	~577	Automated safety check: Pass	MIT	yesterday
Archify Diagramstt-a1i/archify	79k	—	~2.9k	Automated safety check: Pass	MIT	today
Diagram Designcathrynlavery/diagram-design	45k	1 repos	~7.5k	Automated safety check: Pass	MIT	today
Component Refactoringlangflow-ai/langflow	156k	—	~3.5k	Automated safety check: Pass	MIT	today

Similar skills

Brooks Audit
hyhmrright/brooks-lint
Architecture audit that maps module dependencies, checks layering integrity, and flags structural decay across a codebase, drawing on twelve classic engineering books.
1.5k GitHub starsUsed in 1 repo~537 tokens
DevelopmentAuto-check passed
Guidelines
akash-network/node
Behavioral guidelines to reduce common LLM coding mistakes. An agent skill from akash-network/node.
1.1k GitHub starsUsed in 22 repos~577 tokens
DevelopmentAuto-check passed
Archify Diagrams
tt-a1i/archify
Creates interactive architecture, workflow, sequence, data-flow and lifecycle diagrams as standalone HTML with inline SVG, themes and image or video export.
79k GitHub stars~2.9k tokensUpdated today
DevelopmentAuto-check passed
Diagram Design
cathrynlavery/diagram-design
Creates branded diagrams, from architecture, flowchart and sequence to charts and maps, as self-contained HTML with inline SVG, with import from draw.io, Mermaid and Excalidraw.
45k GitHub starsUsed in 1 repo~7.5k tokens
DevelopmentAuto-check passed
Component Refactoring
langflow-ai/langflow
Refactor high-complexity React components in Langflow frontend.
156k GitHub stars~3.5k tokensUpdated today
DevelopmentAuto-check passed
Migrate Core Code to Submodules
tinyhumansai/openhuman
Plans and carries out moving non-host-specific code and its tests from the OpenHuman core into vendored tiny submodule libraries, then releases the submodule and re-pins the host.
42k GitHub stars~2.6k tokensUpdated today
DevelopmentAuto-check passed

Questions about Code Communities

What does Code Communities do?

Detects architectural clusters and coupling boundaries via community detection on the code graph. Code Communities is an agent skill from athola/claude-night-market. Detects architectural clusters and coupling boundaries via community detection on the code graph.

When should I use Code Communities?

Code Communities fits situations like: identifying module groupings; refactoring targets.

How do I install Code Communities in Claude Code?

Run `npx skills add athola/claude-night-market --skill code-communities -a claude-code`. Or copy the skill folder (plugins/cartograph/skills/code-communities in athola/claude-night-market) into .claude/skills/code-communities in your project. Claude Code loads it when a task matches its description.

How do I install Code Communities in Codex?

Run `npx skills add athola/claude-night-market --skill code-communities -a codex`. Or copy the skill folder (plugins/cartograph/skills/code-communities in athola/claude-night-market) into .agents/skills/code-communities in your project. Codex loads it when a task matches its description.

Can I use Code Communities 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 athola/claude-night-market --skill code-communities -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/code-communities, .gemini/skills/code-communities, .github/skills/code-communities and .opencode/skills/code-communities in your project.

What does Code Communities need to run?

Going by SKILL.md and its folder, Code Communities needs the command-line tools its instructions call (python3 and rg). Our summary lists: Python 3.

Does Code Communities 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 Code Communities 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. Review the folder before installing.

What licence does Code Communities use?

Code Communities is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Code Communities use?

About 959 tokens (SKILL.md is roughly 3.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Code Communities?

Skills that share tags, products or a category with Code Communities: Brooks Audit (hyhmrright/brooks-lint, 1.5k stars), Guidelines (akash-network/node, 1.1k stars), Archify Diagrams (tt-a1i/archify, 79k stars) and Diagram Design (cathrynlavery/diagram-design, 45k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Code Communities?

athola (a GitHub user) maintains it in athola/claude-night-market, which has 342 GitHub stars. The repository holds 159 skills in this directory. The repository was last updated on October 6, 2026.

Source: athola/claude-night-market on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Code Communities

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Code Community Detection

When NOT To Use

Prerequisites

Steps

Algorithm

Exit Criteria

Files

Used in 1 other repository

Compare with similar skills

Similar skills

More from athola/claude-night-market

Related

Questions about Code Communities