What is Hal?

What is Hal?

Hal is a terminal-first CLI for PRD-native AI coding loops. It helps developers turn product requirements into planned, validated, reviewable implementation work using supported coding engines such as Codex, Claude Code, and Pi. Hal does not replace human review; it makes agent output easier to inspect before merge.

Short answer

Hal is a command-line tool for running PRD-native AI coding loops. Instead of handing a vague prompt to an agent, you plan the requirement, convert it into structured runtime state, validate the stories, run implementation, and review the output.

What Hal does

Hal helps developers move from product intent to reviewable implementation work. The site describes commands such as hal init, hal plan, hal convert, hal validate, and hal run.

What Hal does not do

Hal does not remove the need for developer review. It does not guarantee code quality, passing tests, delivery speed, revenue, rankings, or production readiness.

Where to start

Install Hal, choose a small task, run the first loop, and inspect every changed file before merging.

Verification rule

Before adopting Hal, inspect the source repository, current install guide, pricing page, and machine-readable pricing. Do not assume hosted plans, unsupported engines, metrics, or guarantees unless the current source documents them.