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Agent skill

Architecture Diagram

by athola in athola/claude-night-market

Generates a Mermaid architecture diagram showing high-level component relationships.

MITAuto-check passedDevelopment

Install Architecture Diagram

skills CLI
$ npx skills add athola/claude-night-market --skill architecture-diagram -a claude-code

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

GitHub CLI
$ gh skill install athola/claude-night-market architecture-diagram --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/architecture-diagram .claude/skills/architecture-diagram && 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
architecture-diagram
GitHub stars
341
Token cost
~768 tokens
SKILL.md length
280 words
Files
1
Skills in repo
152
Repo updated
First seen
Licence
MIT

At a glance

Generates a Mermaid architecture diagram showing high-level component relationships.

  • Works in 4 steps: Explore the Codebase → Generate Mermaid Syntax → Render via MCP → …
  • Visualizing how plugins
  • SKILL.md covers When To Use, When NOT To Use, Workflow and Exit Criteria
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Architecture Diagram is an agent skill from athola/claude-night-market. Generates a Mermaid architecture diagram showing high-level component relationships. Use when visualizing how plugins or modules fit together.

Its SKILL.md is about 770 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 Diagrams. It works with Mermaid and Model Context Protocol. 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

  • Visualizing how plugins
  • Modules fit together

Example prompts

  • “Use the architecture-diagram skill to generate a Mermaid architecture diagram showing high-level component relationships”
  • “/architecture-diagram”

Workflow steps

4 steps, taken from the step headings in SKILL.md.

  1. Explore the Codebase
  2. Generate Mermaid Syntax
  3. Render via MCP
  4. Present Results

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

    No scripts in the folder and no shell commands in SKILL.md (its code samples are mermaid).

    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

Architecture Diagram loads about 768 tokens when it runs. Until then it costs about 41 tokens; SKILL.md has 280 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~41
When it runs · the whole SKILL.md, loaded when a task matches
~768

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). 280 words, ~768 tokens.

Download SKILL.mdSave it as .claude/skills/architecture-diagram/SKILL.md (or your agent's skills folder).
name
architecture-diagram
description
Generates a Mermaid architecture diagram showing high-level component relationships. Use when visualizing how plugins or modules fit together.

Architecture Diagram

Generate a Mermaid flowchart showing high-level component relationships in a codebase.

When To Use

  • Visualizing how plugins/modules relate to each other
  • Onboarding to understand system structure
  • Documenting architecture for PR reviews
  • Answering "how does this system fit together?"

When NOT To Use

  • Import-level coupling (use cartograph:dependency-graph)
  • Runtime call paths (use cartograph:call-chain)

Workflow

Step 1: Explore the Codebase

Dispatch the codebase explorer agent to analyze the scope:

Agent(cartograph:codebase-explorer)
Prompt: Explore [scope] and return a structural model.
Focus on packages, modules, and their relationships
for an architecture diagram.

If no scope is provided, use the project root.

Step 2: Generate Mermaid Syntax

Transform the structural model into a Mermaid flowchart.

Rules for architecture diagrams:

  • Use flowchart TD (top-down) for hierarchical systems
  • Use flowchart LR (left-right) for pipeline/flow systems
  • Group related modules into subgraphs by package
  • Use descriptive edge labels for relationships
  • Limit to 15-20 nodes maximum (aggregate small modules)
  • Use shapes to distinguish component types:
    • [Rectangle] for modules/packages
    • ([Stadium]) for entry points/commands
    • [(Database)] for data stores
    • {Diamond} for decision points

Example output:

mermaid
flowchart TD
    subgraph sanctum[Sanctum Plugin]
        commit[Commit Messages]
        pr[PR Preparation]
        workspace[Workspace Review]
    end

    subgraph leyline[Leyline Plugin]
        git[Git Platform]
        patterns[Error Patterns]
    end

    commit --> git
    pr --> workspace
    pr --> git
    workspace --> patterns
Step 3: Render via MCP

Call the Mermaid Chart MCP to render:

mcp__claude_ai_Mermaid_Chart__validate_and_render_mermaid_diagram
  prompt: "Architecture diagram of [scope]"
  mermaidCode: [generated syntax]
  diagramType: "flowchart"
  clientName: "claude-code"

If rendering fails, fix the Mermaid syntax based on the error message and retry (max 2 retries).

Step 4: Present Results

Show the rendered diagram to the user with a brief summary of what it depicts (2-3 sentences).

Exit Criteria

  • Mermaid flowchart syntax generated containing at least one subgraph block grouping related modules
  • mcp__claude_ai_Mermaid_Chart__validate_and_render_mermaid_diagram called and returns without error (or retry attempted on first failure and result reported)
  • Diagram node count is between 3 and 20 (per skill rules)
  • A 2-3 sentence description of what the diagram depicts is shown alongside the rendered output
  • If the MCP render fails after 2 retries, the Mermaid syntax is still presented as a code block with the error surfaced

© athola, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in plugins/cartograph/skills/architecture-diagram of athola/claude-night-market.

Open the folder on GitHubat commit 9f3eb00

Compare with similar skills

Architecture Diagram 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.

Architecture Diagram compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Architecture Diagram this skillathola/claude-night-market341—~768Automated safety check: PassMIT
Excalidraw Skillyctimlin/mcp_excalidraw2.5k—~4.6kAutomated safety check: PassMIT
GitDiagram Repository Overviewahmedkhaleel2004/gitdiagram18k—~427Automated safety check: PassMIT
Drawiobahayonghang/drawio-skills287—~4.1kAutomated safety check: NotesMIT
Mermaid Diagramsveelenga/claude-mermaid216—~1.3kAutomated safety check: PassMIT
Excalidraw Canvas Toolkitlingzhi227/agent-research-skills390—~3.8kAutomated safety check: PassNone

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Works with

Categories

Questions about Architecture Diagram

What does Architecture Diagram do?

Generates a Mermaid architecture diagram showing high-level component relationships. Architecture Diagram is an agent skill from athola/claude-night-market. Generates a Mermaid architecture diagram showing high-level component relationships.

When should I use Architecture Diagram?

Architecture Diagram fits situations like: visualizing how plugins; modules fit together.

How do I install Architecture Diagram in Claude Code?

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

How do I install Architecture Diagram in Codex?

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

Can I use Architecture Diagram 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 architecture-diagram -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/architecture-diagram, .gemini/skills/architecture-diagram, .github/skills/architecture-diagram and .opencode/skills/architecture-diagram in your project.

What does Architecture Diagram need to run?

SKILL.md names no scripts, command-line tools or credentials: Architecture Diagram is instructions for the agent only.

Does Architecture Diagram 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 Architecture Diagram 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 Architecture Diagram use?

Architecture Diagram 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 Architecture Diagram use?

About 768 tokens (SKILL.md is roughly 3.1k 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 Architecture Diagram?

Skills that share tags, products or a category with Architecture Diagram: Excalidraw Skill (yctimlin/mcp_excalidraw, 2.5k stars), GitDiagram Repository Overview (ahmedkhaleel2004/gitdiagram, 18k stars), Drawio (bahayonghang/drawio-skills, 287 stars) and Mermaid Diagrams (veelenga/claude-mermaid, 216 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Architecture Diagram?

athola (a GitHub user) maintains it in athola/claude-night-market, which has 341 GitHub stars. The repository holds 152 skills in this directory. The repository was last updated on October 9, 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.