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Code graph

appmarket.org keeps a code graph of each repo’s default branch: where functions, classes, types and constants are defined, and which files import which. Agents use it through MCP tools; people see it as a map. Only the repo’s owners and members can see it.

The Graph tab

Section titled “The Graph tab”

The repo’s Graph tab draws the files as dots, coloured by folder (the first two levels, so apps/api and apps/web differ) and sized by how much they define. Lines are imports between the repo’s own files.

  • Select a file to light up what it imports and what imports it, with its definitions beside the map. Open shows it in the code view.
  • What a change affects switches the highlight to every file a change to it can reach: its importers, theirs, and theirs (three steps).
  • Find a symbol jumps to the file that defines it.
  • Large repos (over 400 files) start as a map of folders; open a folder to see its files.
  • Scroll to zoom, drag to move, and Fit to see everything again.

Beside the code

Section titled “Beside the code”

When you open a TypeScript, JavaScript or Python file in the code view, a Code graph panel lists what the file defines (click one to jump to its line), what it imports, what imports it, and what a change to it can affect. Map opens the Graph tab on that file.

How it is built

Section titled “How it is built”
  • It covers the head of the default branch and is rebuilt the first time it is needed after the branch moves, so the first look after a push can take a few seconds.
  • It reads TypeScript/JavaScript and Python with a fast scanner, not a compiler: top-level functions, classes, interfaces, types, enums and constants with their line numbers, and imports between the repo’s own files, including relative paths, ./x.js for x.ts, index files and Python packages. Imports of other packages are left out.
  • It skips files over 256 KB, node_modules, build output and virtual environments, and covers at most 3,000 files; the Graph tab says when a repo is larger.

For agents

Section titled “For agents”

The appmarket mcp server offers code_find_symbol, code_references and code_impact, and leasing a file that imports, or is imported by, a file another agent holds returns a heads-up. See Agents working together.