Claude Mermaid MCP Server renders Mermaid diagrams in Claude Code with live reload. Operations teams use it to visualize workflows, system architectures, and processes. It integrates with Claude Code for real-time updates and expert guidance.
git clone https://github.com/veelenga/claude-mermaid.gitClaude Mermaid MCP Server renders Mermaid diagrams in Claude Code with live reload. Operations teams use it to visualize workflows, system architectures, and processes. It integrates with Claude Code for real-time updates and expert guidance.
[{"step":1,"action":"Ensure the claude-mermaid MCP Server is installed and configured in your Claude Code environment. Verify it’s running by executing `list_mcp_servers` in the terminal.","tip":"If the server isn’t listed, install it via `pip install claude-mermaid-mcp` and restart Claude Code."},{"step":2,"action":"Open a new file in Claude Code (e.g., `auth-flow.mmd`) and paste your Mermaid diagram syntax. Use the MCP Server to render it in real-time by running `mermaid.render --file auth-flow.mmd`.","tip":"For live updates, use `mermaid.watch --file auth-flow.mmd` to automatically refresh the diagram as you edit the file."},{"step":3,"action":"Customize the diagram based on your needs. For example, add or remove components, adjust styling, or integrate dynamic data (e.g., API response times) using placeholders like `[DYNAMIC_VALUE]`.","tip":"Use Mermaid’s built-in themes (e.g., `%%{init: {'theme': 'base', 'themeVariables': { 'primaryColor': '#ff0000' }}}%%`) to match your team’s branding."},{"step":4,"action":"Export the diagram for documentation or sharing. Use `mermaid.export --file auth-flow.mmd --format png` to generate a high-resolution image, or copy the rendered diagram directly into your notes.","tip":"For collaborative editing, share the `.mmd` file with your team and use the MCP Server’s live reload feature to review changes together."},{"step":5,"action":"Iterate based on feedback. For example, if your team identifies a gap in the workflow, update the diagram syntax and re-render it instantly to validate the changes.","tip":"Combine the MCP Server with Claude’s code execution to automate diagram updates. For instance, run a script to fetch real-time system metrics and inject them into the Mermaid syntax."}]
No install command available. Check the GitHub repository for manual installation instructions.
git clone https://github.com/veelenga/claude-mermaidCopy the install command above and run it in your terminal.
Launch Claude Code, Cursor, or your preferred AI coding agent.
Use the prompt template or examples below to test the skill.
Adapt the skill to your specific use case and workflow.
Use the claude-mermaid MCP Server to generate a [DIAGRAM_TYPE] diagram for [SUBJECT]. Include [KEY_ELEMENTS] and ensure the diagram is optimized for [PURPOSE: e.g., documentation, troubleshooting, onboarding]. Update the diagram in real-time as needed during our session. Example: 'Generate a sequence diagram for the user authentication flow in our microservices architecture. Include the API gateway, auth service, and database layers. Optimize it for troubleshooting common login failures.'
Here’s a sequence diagram for the user authentication flow in Acme Corp’s microservices architecture, rendered live via the claude-mermaid MCP Server. The diagram includes the following key components:
```mermaid
sequenceDiagram
participant User
participant API_Gateway as API Gateway
participant Auth_Service as Auth Service
participant User_DB as User Database
participant Session_DB as Session Database
User->>API_Gateway: POST /login {email, password}
API_Gateway->>Auth_Service: Validate credentials
Auth_Service->>User_DB: Query user record
User_DB-->>Auth_Service: User data (hashed password)
Auth_Service->>Auth_Service: Verify password
alt Valid credentials
Auth_Service->>Session_DB: Create session token
Session_DB-->>Auth_Service: Session token
Auth_Service-->>API_Gateway: 200 OK {token}
API_Gateway-->>User: 200 OK {token}
else Invalid credentials
Auth_Service-->>API_Gateway: 401 Unauthorized
API_Gateway-->>User: 401 Unauthorized
end
```
**Key Insights:**
- The API Gateway acts as the single entry point, routing login requests to the Auth Service.
- The Auth Service handles both credential validation and session token generation.
- Session tokens are stored in a dedicated database for scalability.
- Error handling is centralized at the Auth Service level, ensuring consistent responses.
**Next Steps:**
- Add rate-limiting logic to the API Gateway to prevent brute-force attacks.
- Implement token refresh endpoints for long-lived sessions.
- Consider adding multi-factor authentication (MFA) as an optional flow.
Would you like to modify any elements or add additional components (e.g., logging, monitoring)?Faster, smarter diagramming for teams — with markdown-style code and AI.
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