Stop hook that blocks Claude from finishing until quality checks pass. Detects rationalization patterns (surface text heuristics), stale learning logs (filesystem mtime), and low disk space. Complements self-audit by mechanically enforcing learning capture habits. Use when Claude should be mechanica

Delivery Gate — Mechanical Quality Gate for Claude Code A Stop hook that checks three things before Claude can finish a session, using only deterministic checks — file modification timestamps, disk usage, and regex patterns on the transcript text. No AI inference. This is distinct from reasoning gates (like self audit ): delivery gate checks machine verifiable facts; self audit checks output quality across four reasoning dimensions. Together they form defense in depth: delivery gate : "Was the learning library touched today? Is disk space safe?" self audit : "Is the file content correct, complete, and honest?" This is the same pattern as CI pipeline gates — automated, deterministic checks that verify machine readable facts rather than trusting self reported status. What It Checks Check Mechanism On Hit Rationalization patterns Regex on transcript tail Warning only (never blocks) Stale learning libraries mtime on 5 configurable paths Warning if some stale; Block on a complex task if =3 stale OR growth log stale Disk space < 50GB shutil.disk usage Reminder Disk space < 30GB shutil.disk usage Warning Disk space < 15GB shutil.disk usage Block (exit 2), on every Stop Rationalization detection warns about patterns like "skip tests for now" and "pre existing bug" — surface signals that thinking may have been cut short. It never blocks on its own, because regex heuristics can false positive. The blocking conditions are: disk critical (any session), or, on a complex task ( =3 Edit/Write calls), =3 learning libs stale OR growth log specifically stale. If the project memory directory does not exist, the learning library checks are skipped: the hook only warns that it cannot verify learning capture, and a complex task is not blocked (the disk checks still apply). The hook blocks a given Stop at most once. When Claude Code re runs it with stop hook active: true (Claude already continued once because of this hook), it exits 0, so a condition the agent cannot fix (such as low disk space) cannot trap the session in an endless loop. Why Claude Code's built in checks cover code quality (build → type → lint → test). But there's a different failure mode: the agent produces working code while the session hygiene was neglected — learning not captured, rationalized shortcuts, disk running out silently. Over many sessions of "ship and forget," the human hasn't grown. This hook enforces the habit: complex task → must touch learning libraries. Install From the ECC repository root: Add to ~/.claude/settings.json : Learning Libraries Create these files in your project's memory directory ( ~/.claude/projects/<encoded project path /memory/ , where every non alphanumeric character of the project path becomes ). The hook checks which of them were updated today: Customize the LIBS dict to match your own file structure. Configuration Edit quality gate.py : Variable Default Purpose RATIONALIZE 4 patterns Regex patterns for rationalization detection LIBS 5 libraries Files/dirs to check for today's updates COMPLEX THRESHOLD 3 Edit/Write calls to classify as complex DISK REMIND GB 50 Remind below this DISK WARN GB 30 Warn below this DISK CRIT GB 15 Block below this Examples Simple session — allowed: Complex task, learning captured — allowed: Complex task, no learning — BLOCKED: Low disk space — BLOCKED: Limitations The hook enforces the habit of touching learning libraries, not the quality of what was recorded. On a complex task it passes only when growth log was updated today and at most 2 libraries are stale; updating output index.md alone still blocks. Without a project memory directory there is nothing to check, so it only warns. This is by design: mechanical gates check machine verifiable facts. For content quality verification, pair with self audit . Compatibility Python 3.8+ (uses from future import annotations ) Cross platform: Windows, macOS, Linux Zero dependencies beyond stdlib Quality This code went through 4 rounds of automated code review (CodeRabbit + Greptile) with 9 real bugs found and fixed. See Also self audit — Reasoning quality gate (completeness/consistency/groundedness/honesty) verification loop — Code quality checks (build/type/lint/test) gateguard — PreToolUse safety gate

delivery-gate