Architecture Diagram Skill for Claude

Generates a Mermaid architecture diagram showing high-level component relationships. Use when visualizing how plugins or modules fit together.

767 tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

324

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/athola/claude-night-market --skill architecture-diagram

The instruction itself

9 sections, as written by the author

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:

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

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How to use it

Copy the folder

Take athola/architecture-diagram from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.