Headcount makes agent write boundaries inspectable

Headcount describes 16 departments and 172 skills in its repository, inspected on 2 October 2026. That catalogue is useful for finding expertise. The part I would examine first is smaller: a method that makes agent write boundaries inspectable before their changes land.

For teams running coding agents in parallel, the question is whether each change can be checked against an explicit owner. Headcount supplies a concrete starting point. My caveat is that the check needs attributable work; naming an agent cannot recover authorship after several agents have edited the same checkout.

How Headcount checks agent write boundaries

The hierarchy skill divides builders by file patterns, keeps reviewers read-only and gives the orchestrator responsibility for commits. That turns a vague remit such as “handle the frontend” into a boundary a tool can inspect.

Its guard script separates two questions. check examines whether tracked files have coherent ownership. diff <agent> checks changed paths against that agent's declared area. By default, the latter reads working-tree changes; it does not identify which process wrote each file.

That distinction changes the rollout. A perfectly tidy ownership map can coexist with a messy, mixed diff. The map says who should write. Your execution arrangement must preserve evidence of who did.

The Headcount trial I would run

My editorial judgment is to start with one builder and one attributable change set. Give it an allowed edit and an intentional edit outside its boundary. Check that the legitimate change passes and the stray one fails before integrating anything. Only then add concurrent builders, using isolated work or another reliable way to preserve attribution.

Keep a separate quality review. Correct file ownership says nothing about whether the patch works, and this script is a checker rather than a filesystem sandbox. I read the repository instructions and guard source; I have not installed it or measured conflict reduction.

What's in it for you

• Turn agent responsibilities into explicit file boundaries before adding more roles.
• Test both ownership coverage and actual changed paths; one cannot substitute for the other.
• Preserve attributable changes until the boundary check has run.

An agent boundary becomes useful when you can show which change crossed it, before that change is merged.

Sources

• Alex Veremeyenko — Headcount share, inspected 2 October 2026.
• Headcount — repository, inspected 2 October 2026.
• Headcount — agent hierarchy, inspected 2 October 2026.
• Headcount — ownership guard source, inspected 2 October 2026.