Question 1

What is Arbor?

Accepted Answer

Arbor is deterministic PR blast-radius analysis. It parses the repo, builds a call graph, walks changed paths, and comments with what the graph can reach — without an LLM in the risk path.

Question 2

Can AI coding agents use Arbor?

Accepted Answer

Yes. Arbor produces a compact PR brief with risky paths, likely side effects, unknown edges, and the first test to write so agents can keep edits scoped.

Question 3

Does Arbor work with GitHub pull requests?

Accepted Answer

Yes. Arbor installs as a GitHub App, analyzes pull requests, and comments with the breakage path reviewers should inspect.