ASCII Diagram Generator

Create ASCII diagrams for flows, architectures, and processes.

Arguments: $ARGUMENTS

Instructions

Generate an ASCII diagram based on the user’s description provided in $ARGUMENTS.

If no arguments provided, ask the user what they want diagrammed.

Phase 1: Analyze the Request

1. Parse the $ARGUMENTS to understand what flow/diagram is needed
2. Identify the type of diagram:
   • Flow diagram: Sequential steps with arrows
   • Architecture diagram: Boxes representing components
   • Sequence diagram: Interactions between entities
   • Tree/hierarchy: Parent-child relationships
   • State machine: States and transitions

Phase 2: Create the Diagram

Generate a clean ASCII diagram using these conventions:

Boxes:

┌─────────────┐
│   Label     │
└─────────────┘

Arrows:

• Horizontal: ───> or <───
• Vertical: │ with ▼ or ▲
• Bidirectional: <──>

Flow connections:

┌───────┐     ┌───────┐
│ Step1 │────>│ Step2 │
└───────┘     └───────┘

Decision points:

    ┌───────┐
    │ Check │
    └───┬───┘
        │
   ┌────┴────┐
   ▼         ▼
┌─────┐   ┌─────┐
│ Yes │   │ No  │
└─────┘   └─────┘

Guidelines:

• Keep boxes aligned and evenly spaced
• Use consistent widths where possible
• Add labels to arrows when needed: ──(label)──>
• Use comments/notes outside the diagram for context
• Keep it readable — don’t overcrowd

Phase 3: Present the Diagram

Display the completed ASCII diagram in a code block:

[Your ASCII diagram here]

Phase 4: Ask About Saving

After showing the diagram, ask the user what they’d like to do:

What would you like to do with this diagram?

1. Save to a new markdown file
2. Add to an existing file
3. Don't save (just viewing)

Use the AskUserQuestion tool with these options:

• Save to new file: Ask for filename, create [filename].md with the diagram in a code block
• Add to existing file: Ask which file, then append the diagram to that file
• Don’t save: Acknowledge and end

Saving Behavior

New file format:

# [Title based on diagram content]

[ASCII diagram in code block]

---
*Generated with /ascii*

Appending to existing file:

• Add a newline separator
• Insert the diagram in a code block
• Don’t modify existing content

Examples

Input: /ascii user login flow

Output:

┌──────────┐     ┌────────────┐     ┌──────────────┐
│  User    │────>│ Login Form │────>│ Validate     │
└──────────┘     └────────────┘     └──────┬───────┘
                                           │
                                    ┌──────┴──────┐
                                    ▼             ▼
                              ┌─────────┐   ┌─────────┐
                              │ Success │   │ Error   │
                              └────┬────┘   └────┬────┘
                                   │             │
                                   ▼             ▼
                              ┌─────────┐   ┌─────────┐
                              │Dashboard│   │ Retry   │
                              └─────────┘   └─────────┘

Input: /ascii api request lifecycle

Output:

┌────────┐    ┌────────────┐    ┌────────────┐    ┌──────────┐
│ Client │───>│ Middleware │───>│ Controller │───>│ Service  │
└────────┘    └────────────┘    └────────────┘    └────┬─────┘
     ▲                                                 │
     │                                                 ▼
     │                                           ┌──────────┐
     │                                           │ Database │
     │                                           └────┬─────┘
     │                                                │
     └────────────────────────────────────────────────┘
                        Response