delivery-gate

Delivery Gate is a Claude Code Stop hook that mechanically blocks a session from being declared finished until a set of deterministic quality checks pass. Rather than relying on AI inference, it verifies only machine-readable facts: filesystem modification timestamps on designated learning files, available disk space via shutil.disk_usage, and regex patterns run over the tail of the transcript. It exists to catch a failure mode distinct from broken code — the agent producing working output while session hygiene is neglected, learning goes uncaptured, shortcuts get rationalized, and disk quietly runs low.

The hook runs three categories of check. Rationalization detection scans the transcript for surface phrases like 'skip tests for now' and only ever warns, never blocks, because regex heuristics false-positive. Stale-learning detection checks mtime on five configurable library paths and blocks a complex task (classified by an edit/write threshold) when three or more are stale or the growth-log specifically is stale. Disk checks warn below 50GB and block below 15GB with exit code 2. Configuration is done by editing the Python file's LIBS dict, thresholds, and pattern list. Installation copies the script into the Claude scripts directory and registers it as a Stop hook in settings.json.

It targets Claude Code power users who want to enforce learning-capture and operational-hygiene habits automatically as a form of defense-in-depth, pairing with reasoning gates like self-audit. It is deliberately limited: it enforces the habit of touching learning files, not the quality of what was written, and is cross-platform Python 3.8+ with zero dependencies beyond the standard library.