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How to check what a planned change could affect with Compass

Trace reverse dependencies and directed paths for a symbol before editing it.

Short answer: Install the CLI and run cd your-project followed by compass init; then compass explain <symbol name>; compass affected <symbol name> --depth 3. All steps.

Who it is forAn engineer about to modify a function or type who needs to know which callers and dependents may break.

The problemManual searches miss indirect dependents, so a change can break code several hops away.

The outcomeA bounded list of affected nodes, a path between two symbols, and an explanation of the symbol, all tied to graph evidence.

What you need first

  • A terminal on macOS, Linux, or Windows
  • A local project folder or Git repository to analyze
  • Rust 1.97.1 or newer only if you build from source

Steps

  1. Install the CLI and run cd your-project followed by compass init.
  2. compass explain <symbol name> (inferred, check the README)
  3. compass affected <symbol name> --depth 3 (inferred, check the README)
  4. compass path <caller symbol> <symbol name> (inferred, check the README)
  5. compass export html --impact-graph "$symbol_id" to view the impact neighborhood visually, where symbol_id is the id of your symbol. (inferred, check the README)

Prompt for your agent

In the repository at <project path>, use the crabbuild/compass CLI to run `compass affected <symbol name> --depth 3` and `compass path <caller symbol> <symbol name>`. Expected output: the list of affected nodes and the directed path between the two symbols. Verify that each reported node includes a source location before you treat it as a real dependent.

Caveat. Compass reports evidence limits and ambiguous matches, so treat the affected list as a guide to review rather than a complete proof of impact.

Use this in your AI agent

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Using the Deduped MCP, get the setup steps for crabbuild/compass and "Check what a planned change could affect"

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