disinto/disinto-factory/lessons-learned.md
Claude f0c3c773ff
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fix: tech-debt: sweep cron-isms from code comments, helpers, lib, and public site copy (#548)
- Rename acquire_cron_lock → acquire_run_lock in lib/formula-session.sh
  and all five *-run.sh call sites
- Update all *-run.sh file headers: "Cron wrapper" → "Polling-loop wrapper"
- Rewrite docs/updating-factory.md: replace crontab check with pgrep,
  replace "Crontab empty after restart" section with polling-loop equivalent
- Update docs/EVAL-MCP-SERVER.md to reflect polling-loop reality
- Update lib/guard.sh, lib/AGENTS.md, lib/ci-setup.sh comments
- Update formulas/*.toml comments (cron → polling loop)
- Update dev/dev-poll.sh usage comment
- Update tests/smoke-init.sh to handle compose vs bare-metal scheduling
- Update .woodpecker/agent-smoke.sh comments
- Update site HTML: architecture.html, quickstart.html, index.html
- Clarify _install_cron_impl is bare-metal only (compose uses polling loop)
- Keep site/collect-engagement.sh and site/collect-metrics.sh cron refs
  (genuinely cron-driven on the website host, separate from factory loop)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-10 08:54:11 +00:00

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# Lessons learned
## Remediation & deployment
**Escalate gradually.** Cheapest fix first, re-measure, escalate only if it persists. Single-shot fixes are either too weak or cause collateral damage.
**Parameterize deployment boundaries.** Entrypoint references to a specific project name are config values waiting to escape. `${VAR:-default}` preserves compat and unlocks reuse.
**Fail loudly over silent defaults.** A fatal error with a clear message beats a wrong default that appears to work.
**Audit the whole file when fixing one value.** Hardcoded assumptions cluster. Fixing one while leaving siblings produces multi-commit churn.
## Documentation
**Per-context rewrites, not batch replacement.** Each doc mention sits in a different narrative. Blanket substitution produces awkward text.
**Search for implicit references too.** After keyword matches, check for instructions that assume the old mechanism without naming it.
## Code review
**Approval means "safe to ship," not "how I'd write it."** Distinguish "wrong" from "different" — only the former blocks.
**Scale scrutiny to blast radius.** A targeted fix warrants less ceremony than a cross-cutting refactor.
**Be specific; separate blockers from preferences.** Concrete observations invite fixes; vague concerns invite debate.
**Read diffs top-down: intent, behavior, edge cases.** Verify the change matches its stated goal before examining lines.
## Issue authoring & retry
**Self-contained issue bodies.** The agent reads the body, not comments. On retry, update the body with exact error and fix guidance.
**Clean stale branches before retry.** Old branches trigger recovery on stale code. Close PR, delete branch, relabel.
**Diagnose CI failures externally.** The agent sees pass/fail, not logs. After repeated failures, read logs yourself and put findings in the issue.