Back to ArborAgents change code.
Where it fits
Agents change code.
Tests prove behavior.
Arbor maps the PR path.
The missing question in most PR reviews is simple: what does this diff actually touch downstream? Arbor walks the graph and gives the answer to the reviewer, the solo dev, or the AI agent about to make the next edit.
AI agents
Great at edits once the task is grounded. Weak when they only get a diff and a vague prompt.
Tests
The final proof. Arbor helps name the first regression test to write or run.
Logs
Useful after release. Arbor gives you pre-merge context while the change is still cheap.
Where it fits
AI agents can write code. Arbor tells them where not to wander.
Keep your agents, tests, logs, and reviewers. Arbor adds the missing pre-merge map: the path from the diff to the thing a small team does not want to break.
| Capability | Arbor | AI agent | Unit tests | Runtime logs | Manual review |
|---|---|---|---|---|---|
| Finds downstream side effects before merge | Walks changed code into routes, jobs, webhooks, helpers, and data writes. | Can infer from context, but often misses hidden call paths. | Only catch paths already covered. | Show behavior after code runs. | Depends on reviewer memory and time. |
| Produces a compact agent handoff | Returns scope, likely break, unknown edges, and first test to write. | Usually starts from prompt and diff only. | No patch scope or path map. | No pre-edit guidance. | Can write instructions, but it does not scale. |
| Names what to test | Points at the regression test that matches the path. | Can write tests once the risk is named. | Great once they exist. | Can reveal missing coverage after a failure. | Reviewers know business context. |
| Shows honest unknowns | Unresolved edges stay visible in the PR note. | May ask, may hallucinate, may continue. | No signal for unwalked code. | No event is not proof. | Only if the reviewer notices. |
| Fits solo dev / tiny team workflow | One GitHub App, one PR comment, no ceremony. | Useful when grounded by Arbor's brief. | Still the final proof. | Useful after release. | Hard when everyone is shipping. |
Free for public repos
Try it on your next PR
Install takes 2 minutes. Arbor posts a path map on the next pull request and calls out the first thing worth checking.