Cartographer: See Your Codebase as a Graph

The problem with large codebases

The bigger a codebase gets, the harder it is to answer a simple question: if I change this function, what breaks?

Grep helps. Type checkers help more. But neither gives you a true picture of runtime dependencies — the actual paths that execute when your code runs.

What Cartographer does

Cartographer analyzes your repository and builds a call graph: a directed graph where nodes are functions, methods, and classes, and edges are calls between them.

From that graph you can:

• Run impact analysis before a refactor — see every upstream caller at depth 1, 2, and 3
• Find dead code — nodes with no incoming edges
• Trace a bug backwards from a symptom to a root cause
• Understand an unfamiliar codebase in minutes instead of days

How it integrates with Claude Code

We ship a set of MCP tools that expose the graph to Claude Code directly. Before editing a function, Claude runs gitnexus_impact to see the blast radius. Before committing, it runs gitnexus_detect_changes to verify only expected symbols changed.

The result is an AI coding assistant that understands your codebase structure, not just the file it’s currently reading.

Early access

Cartographer is in early access alongside Harness Builder. Both are available now at skylence.be.