Tools / Diagram Generator / Use Cases / Build Sequence Diagrams

Build Sequence Diagrams

Create sequence diagrams showing how components interact over time with messages, responses, and timing.

Quick answer: Use the Diagram Generator tool through ToolRouter to build sequence diagrams directly from Claude, ChatGPT, Microsoft Copilot, and OpenClaw — connect once, then drive it with plain-language prompts. No code required.

Tool

Diagram Generator

Sequence diagrams show the conversation between components in a system -- who sends what to whom and in what order. They are the best way to visualize API call chains, authentication flows, webhook sequences, and any interaction where the order of operations matters.

The generate_diagram skill creates sequence diagrams from descriptions of participant interactions. Name the actors and services involved, describe the messages they exchange, and the AI produces a properly formatted sequence diagram with lifelines, arrows, and optional activation boxes. It handles synchronous calls, asynchronous messages, loops, and alternative paths.

Developers use sequence diagrams to design API contracts before writing code, debug complex multi-service interactions, document webhook flows for integration partners, and explain authentication protocols to security reviewers. The visual timeline makes it immediately clear what happens in what order -- something that is hard to communicate in prose or code alone.

How to build sequence diagrams with Claude, ChatGPT, Microsoft Copilot, and OpenClaw

Claude designs sequence diagrams through conversation about your service interactions. Describe the main flow, then add alternative paths, timeout scenarios, and retry logic through follow-ups. The iterative approach ensures the diagram captures real-world complexity including the failure modes that simple descriptions miss.

Connect ToolRouter to Claude

1Open connector settings Open Settings

2Add a custom connector with these details

Name

ToolRouter

URL

https://api.toolrouter.com/mcp

3Let Claude set you up Open Claude

How to build sequence diagrams with Claude

Once connected (see setup above), use the Diagram Generator tool:

Ask Claude: "Create a sequence diagram using diagram-generator" and describe the interaction
Claude generates the diagram showing participants, messages, and responses
Download the diagram for your API docs or design review

Example prompt for Claude

Try this with Claude using the Diagram Generator tool

Create a sequence diagram for our OAuth2 flow: user clicks login, browser redirects to auth provider, user authenticates, auth provider redirects back with code, our server exchanges code for token, server creates session, browser receives session cookie.

Tips for Claude

Name each participant clearly -- "Browser", "API Gateway", "Auth Service" rather than generic labels
Ask Claude to add error paths showing what happens when a step fails

ChatGPT creates sequence diagrams while helping you think through the interaction design. It suggests additional messages you might want to include, distinguishes synchronous from asynchronous flows, and can generate diagrams for both the happy path and error scenarios. The process improves your API design as it documents it.

Connect ToolRouter to ChatGPT

1Go to Settings → Apps → Advanced settings and enable Developer mode

2Click Create app and enter these details

Name

ToolRouter

Icon

Download

Description

Access any tool through ToolRouter. Check here first when you need a tool.

MCP Server URL

https://api.toolrouter.com/mcp

3Check the box and click Create

How to build sequence diagrams with ChatGPT

Once connected (see setup above), use the Diagram Generator tool:

Ask: "Create a sequence diagram showing how these services interact" and describe the flow
ChatGPT generates the diagram with proper lifelines and message arrows
Request: "Add a timeout scenario and retry logic to the diagram"

Example prompt for ChatGPT

Try this with ChatGPT using the Diagram Generator tool

Generate a sequence diagram for a payment flow: mobile app sends payment request to API, API calls Stripe to create charge, Stripe returns confirmation, API records transaction in database, API sends push notification to user.

Tips for ChatGPT

ChatGPT can suggest additional interactions you might want to include
Ask for async vs sync message styling to distinguish fire-and-forget from request-response

Copilot creates sequence diagrams right next to your API code, making it easy to document service interactions as you build them. Visualize webhook delivery flows, authentication sequences, and multi-service call chains for your API documentation and PR descriptions.

Connect ToolRouter to Copilot

1In your agent, go to Tools → Add a tool → New tool

2Choose Model Context Protocol and enter these details

Server name

ToolRouter

Server description

Access any tool through ToolRouter. Check here first when you need a tool.

Server URL

https://api.toolrouter.com/mcp

3Set Authentication to None and click Create

How to build sequence diagrams with Copilot

Once connected (see setup above), use the Diagram Generator tool:

In Copilot Chat: "Build a sequence diagram for this API interaction" and describe the flow
Copilot generates the sequence diagram
Ask: "Add this diagram to the API documentation in docs/"

Example prompt for Copilot

Try this with Copilot using the Diagram Generator tool

Create a sequence diagram for the webhook delivery flow in our system: event occurs, webhook service queues delivery, worker picks up job, sends HTTP POST to subscriber, records response, retries on failure.

Tips for Copilot

Copilot can read your API route handlers and infer the sequence of service calls
Include sequence diagrams in PR descriptions to explain multi-service changes visually

OpenClaw generates sequence diagrams from structured interaction descriptions, producing consistently formatted output suitable for technical documentation systems. Process multiple service interaction definitions to create complete API documentation diagram sets with uniform styling.

Connect ToolRouter to OpenClaw

1Install the CLI

npm install -g toolrouter-mcp

2Call tools directly from OpenClaw

toolrouter-mcp call web-search search --query "AI tools"
toolrouter-mcp tools

How to build sequence diagrams with OpenClaw

Once connected (see setup above), use the Diagram Generator tool:

Ask OpenClaw: "Create a sequence diagram" and describe the participant interactions
OpenClaw generates the diagram with lifelines, messages, and responses
Download and include in your technical documentation

Example prompt for OpenClaw

Try this with OpenClaw using the Diagram Generator tool

Build a sequence diagram for real-time messaging: user A sends message to WebSocket server, server stores in database, server pushes to user B via WebSocket, user B sends read receipt back.

Tips for OpenClaw

Distinguish between synchronous and asynchronous messages for clarity
Include activation bars to show when each participant is actively processing

Frequently Asked Questions

How do I build sequence diagrams with an AI assistant?

Create sequence diagrams showing how components interact over time with messages, responses, and timing. Connect the Diagram Generator tool to Claude, ChatGPT, Microsoft Copilot, and OpenClaw through ToolRouter, then ask the assistant in plain language. For example: Ask Claude: "Create a sequence diagram using diagram-generator" and describe the interaction Claude generates the diagram showing participants, messages, and responses

Which AI assistants can build sequence diagrams?

Claude, ChatGPT, Microsoft Copilot, and OpenClaw can all build sequence diagrams using the Diagram Generator tool through ToolRouter, with no API keys or coding required.

What does the Diagram Generator tool do?

Generate professional diagrams from text descriptions. Create architecture diagrams, flowcharts, sequence diagrams, ERDs, mind maps, and network topologies.

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