Night Market Skill — ported from claude-night-market/cartograph. For the full experience with agents, hooks, and commands, install the Claude Code plugin.

Workflow Diagram

Generate a Mermaid flowchart showing process workflows, pipelines, or state machines from code or documentation.

When To Use

• Visualizing CI/CD or deployment pipelines
• Documenting multi-step development workflows
• Mapping state machines or lifecycle processes
• Answering "what steps happen when X runs?"

Workflow

Step 1: Explore the Codebase

Dispatch the codebase explorer agent:

Agent(cartograph:codebase-explorer)
Prompt: Explore [scope] and return a structural model.
Focus on process steps, conditional logic, state
transitions, and pipeline stages for a workflow diagram.
Look for: Makefiles, CI configs, hook chains, command
sequences, and lifecycle methods.

Step 2: Generate Mermaid Syntax

Transform the structural model into a Mermaid flowchart with decision nodes and process steps.

Rules for workflow diagrams:

• Use

  flowchart TD

  for sequential processes
• Use

  flowchart LR

  for pipelines with parallel tracks
• Use shapes to distinguish step types:

  • [Rectangle]

    for process steps

  • {Diamond}

    for decision points

  • ([Stadium])

    for start/end states

  • [[Subroutine]]

    for sub-processes

  • ((Circle))

    for join/sync points
• Use

  -->|label|

  for transition conditions
• Group parallel tracks into subgraphs
• Color-code by outcome:
  • Default for happy path
  • Dotted (

    -.->

    ) for error/fallback paths
  • Thick (

    ==>

    ) for critical path
• Limit to 20 nodes maximum

Example output:

flowchart TD
    start([Start: PR Created])
    lint[Run Linters]
    test[Run Tests]
    review{Code Review}
    approve[Approved]
    changes[Request Changes]
    merge([Merge to Main])

    start --> lint --> test
    test --> review
    review -->|pass| approve --> merge
    review -->|fail| changes -.-> lint

Step 3: Render via MCP

Call the Mermaid Chart MCP to render:

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

If rendering fails, fix syntax and retry (max 2 retries).

Step 4: Present Results

Show the rendered diagram with a brief description of the workflow stages and decision points (2-3 sentences).