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Feature Wiki

Feature is the .feat execution specification language and toolchain: specs that instruct an agent how to build, predict every observable effect, and compile deterministically into complete test suites — then hold the implementation to them in CI.

Pages

• Core Concepts — prediction inversion, the dual zones, the four closed reference spaces, the agent contract, the spec lifecycle.
• Language Guide — a guided tour of .feat by example; the full normative reference lives in-repo at docs/grammar-reference.md.
• CLI Reference — every command, flag, exit code, and output shape.
• Architecture — packages, the compile pipeline, the runtime, adapters, and the determinism invariants.
• Status and Roadmap — what is built, what is deferred, and what ships next.

The elevator version

Every spec-to-test approach has a translation layer where drift and interpretation creep in — step definitions, manual test authoring, or a model guessing what your requirements meant. Feature removes the layer: predictions are quantified measurement contracts, the compiler is deterministic (same spec = same tests, byte for byte), and feat verify makes drift a build failure. This repository builds Feature with Feature: its components are specified in .feat, their suites are generated, and its CI chain is feat verify && feat run.