LikeC4 MCP Server: Setup for Claude, Cursor and Other Apps

• Lists the LikeC4 projects in your workspace

  Returns the architecture projects found in your workspace folder.

  Try: “Which LikeC4 projects do I have?”

  Read · list-projects

• Summarizes one project

  Returns a project's elements, deployment nodes and views in one summary, so the assistant learns your architecture.

  Try: “Summarize the architecture project.”

  Read · read-project-summary

• Finds elements by name, title or description

  Searches your architecture model and ranks the matches. You can narrow it by kind, shape, tag or metadata.

  Try: “Find the elements that mention payments.”

  Read · search-element

• Shows everything about one element

  Returns an element with its relationships, the views it appears in, where it is deployed and where it is defined in your files.

  Try: “Show me the details of the billing service.”

  Read · read-element

• Shows a deployment node or deployed instance

  Returns details about where part of your system is deployed.

  Try: “Where is the billing service deployed?”

  Read · read-deployment

• Shows the contents of one diagram view

  Returns the boxes and arrows of a view and where it is defined in your files.

  Try: “What does the context view contain?”

  Read · read-view

• Draws a view as a diagram in the chat

  Shows a diagram you can pan and zoom, in apps that support MCP Apps.

  Try: “Show me the system context view.”

  Read · render-view

• Previews a new view before you save it

  Draws a view from text you write, using your real elements, without saving anything.

  Try: “Preview a view with only the API and the database.”

  Read · preview-view

• Finds how two elements are connected

  Returns the links between two elements, direct and indirect.

  Try: “How is the web app connected to the database?”

  Read · find-relationships

• Finds every chain of links between two elements

  Lists the routes from one element to another through your model, optionally including implied links.

  Try: “Show all paths from the web app to the database.”

  Read · find-relationship-paths

• Looks up parents, children, siblings and neighbours

  Returns where an element sits in the hierarchy and what links into or out of it.

  Try: “What are the children of the backend system?”

  Read · query-graph

• Lists everything an element depends on

  Follows links upstream and returns every producer an element depends on.

  Try: “What does the billing service depend on?”

  Read · query-incomers-graph

• Lists everything that depends on an element

  Follows links downstream and returns every consumer of an element.

  Try: “What depends on the auth service?”

  Read · query-outgoers-graph

• Finds elements by metadata values

  Finds elements whose metadata matches a key and value, or just has the key.

  Try: “Which elements have owner set to team-payments?”

  Read · query-by-metadata

• Finds elements by tags

  Finds elements that have all, any or none of the tags you give.

  Try: “List the elements tagged deprecated.”

  Read · query-by-tags

• Finds elements by tag name pattern

  Finds elements whose tags start with, contain or end with a pattern.

  Try: “Find elements with tags starting with team-.”

  Read · query-by-tag-pattern

• Reads several elements at once

  Returns summaries for a list of elements in one go.

  Try: “Give me summaries of the API, the queue and the database.”

  Read · batch-read-elements

• Summarizes everything inside an element

  Returns a summary of what sits inside an element, with depth and link counts.

  Try: “Summarize everything inside the backend system.”

  Read · subgraph-summary

• Compares two elements

  Shows how two elements differ in properties, tags, metadata and links.

  Try: “Compare the old and new billing services.”

  Read · element-diff

• Shows what removing an element would affect

  Reports the links, views and instances that would be affected if you removed an element. It does not remove anything.

  Try: “What breaks if I remove the legacy queue?”

  Read · removal-impact

• Lists model changes marked as diffs

  Returns the diff blocks in your model and the views each one changes.

  Try: “What diffs are in the model?”

  Read · list-diffs

• Asks the assistant to improve a view's layout and saves it

  Sends the view to your assistant to suggest layout changes, then applies them and saves a snapshot. It is the one tool that writes.

  Try: “Tidy up the layout of the context view.”

  Write · apply-semantic-layout

Watch out for

• HTTP mode listens on every network interface

  With --http the server binds 0.0.0.0 on port 33335 (default), has no sign-in, and allows requests from any origin. Anyone who can reach the port can read your model and trigger the layout tool. The default stdio mode opens no port. github.com

• One tool writes a layout snapshot

  The semantic layout tool applies the layout your assistant suggests and saves a snapshot. Review the result in version control. github.com

• It reads your whole workspace

  It watches the workspace folder for changes by default. Start it in the folder with your model. github.com

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