modify_diagram
Add/remove/update nodes and connections on an existing diagram
How to use it
modify_diagram is exposed by the Excalidraw Architect MCP MCP server. Add the server to your MCP client (Claude Desktop, Cursor, Windsurf and others), and the modify_diagram tool becomes available to the model automatically. See the full listing for setup details and every tool this server provides.
Install Excalidraw Architect MCP
uvx excalidraw-architect-mcpOther tools in Excalidraw Architect MCP (19)
Create a new diagram from structured node/connection data
Export .excalidraw to SVG or PNG image
Read current diagram state (call before modifying)
Show how the architecture changed since a git ref
Detect drift between the declared graph and Python imports
Export the graph to Mermaid, Graphviz DOT, or JSON
Bootstrap the graph from an existing .excalidraw diagram
Summarize services, domains, and topology
Create a new knowledge graph file
Health check: cycles, single points of failure, orphans, dangling refs
Generate a human onboarding guide from the graph
Trace the dependency path between two services
Render the whole architecture to .excalidraw
Render everything within N hops of a service
Render a single domain
Render a focused diagram of specific services
Group a service into a domain / bounded context
Convert Mermaid flowchart syntax to .excalidraw
Impact analysis — upstream/downstream blast radius