pre-release-review - SKILL.md Agent Skill

name: pre-release-review description: > Production pre-release code review and deploy-readiness audit for web/backend services. Use this skill whenever the user mentions release audit, pre-release review, production deploy, deploy readiness, go-live review, code release, publishing to production, tag release, CI/CD before production, checking a PR before release, or asking whether code is safe to ship. This skill compares a PR or git range against the previous release point and looks for missing migrations, environment/config changes, seeded data, cache work, queues, object storage assets, credentials leaks, service deployment order, rollback risk, and other production launch blockers. Prefer this skill even when the user only says "review this release" or "check production risks". metadata: author: chaunsin version: "0.1"

Pre-release Review

Use this skill to run a read-only production release readiness review. The goal is to reduce release time and coordination failures by finding missing deploy materials, unsafe ordering, configuration gaps, data migration gaps, and ambiguous production risks before CI/CD or manual release steps begin.

Non-negotiable rules

Do not modify source code, configs, migrations, secrets, deployment files, or generated files.
Do not execute migrations, clear or warm caches, upload assets, trigger CI/CD, deploy services, publish tags, rotate secrets, or change remote infrastructure.
Produce a concise report that lists only confirmed problems and plausible risks needing confirmation. Do not bury the reader in clean checklist items.
Sort findings from highest to lowest priority.
Include module, finding, evidence, inferred owner, risk, and recommended action for each item.
Never reveal private keys, account passwords, tokens, certificates, cookies, or full secret values. Report only file path, line number, variable name, secret type, and a redacted hint.
If evidence is incomplete but the risk could block production, list it as a confirmation item.

Required references

Read references/checklist.md before analyzing findings so important release domains are not skipped.
Read references/report-template.md before writing the final report so priorities, owner inference, secret redaction, and output shape stay consistent.

Project guidance discovery

Before interpreting the release diff, look for project-local guidance files such as AGENTS.md and CLAUDE.md in the repository root and relevant service directories. Read them when present so the review respects the user's project-specific conventions, service boundaries, release rules, validation expectations, ownership hints, and known operational constraints.

Treat project guidance as context for how to interpret risks, not as permission to perform mutating release actions.
If project guidance conflicts with this skill's non-negotiable safety rules, the read-only, no-secret-disclosure rules in this skill win.
If a relevant guidance file cannot be read, note the limitation in "Unable To Verify" only when it affects the release review.

Scope selection

Determine the review range before judging risk. State the chosen range in the report.

If the user provides a pull request URL or PR number, review that PR diff first.
- If gh is available and authenticated, use read-only commands such as gh pr view and gh pr diff.
- If the PR cannot be fetched due to missing tooling, auth, or network limits, say so and ask for a local branch, patch, or explicit git range. Do not invent the PR contents.
If the user provides an explicit base..head range, use it directly.
If the user provides only a head commit, compare the previous usable release tag reachable from that commit to the head commit.
If the user provides no scope, compare the previous usable release tag to HEAD.
Choose the previous usable release tag carefully:
- Prefer the repository's visible release-tag convention when one is obvious, such as semantic versions, v*, or release-*. If tag naming is mixed, state the assumption.
- If HEAD is exactly at one or more tags, treat those as the current release point and compare against the earlier reachable release tag, not HEAD's own tag.
- If no usable previous release tag exists, review the latest 5 commits and explicitly warn that this is a fallback: there is no usable previous release tag, so the audit only covers the latest 5 commits; recommend a PR or tag-based range for future reviews.

Read-only evidence collection

Run only safe inspection commands, adjusted to the repository and current permissions. Useful commands include:

git status --short
git rev-parse --show-toplevel
git rev-parse --abbrev-ref HEAD
git rev-parse HEAD
rg --files -g 'AGENTS.md' -g 'CLAUDE.md'
git tag --merged HEAD --sort=-creatordate
git tag --points-at HEAD
git for-each-ref --sort=-creatordate --format="%(refname:short) %(objectname:short)" refs/tags
git describe --tags --abbrev=0 HEAD
git diff --name-status <base>..<head>
git diff --stat <base>..<head>
git log --oneline --decorate --no-merges <base>..<head>
git diff -U3 <base>..<head> -- <path>
git blame -L <start>,<end> -- <path>
git log --format="%h %an %s" -- <path>
rg -n "<pattern>" .

For PRs, use gh pr view and gh pr diff only when they are available and allowed. Do not bypass network, auth, sandbox, or approval restrictions. If a command cannot run, record the limitation in the report's "Unable to verify" section.

Review workflow

Confirm the git repository root, current branch, dirty state, and selected comparison range.
Collect changed file names, file status, diff stats, commit summaries, and touched services.
Inspect relevant diffs rather than relying on filenames alone.
Use the checklist to map changed code to production requirements:
- schema changes to migrations, indexes, seeds, and backfills
- config reads to env examples, deploy secrets, flags, and runtime config
- cache key or TTL changes to invalidation, prewarm, and compatibility work
- queue producers/consumers to topic setup, DLQ, idempotency, and deploy order
- asset references to object storage, CDN, templates, certificates, and permissions
- service contract changes to deploy sequence, backward compatibility, and rollback risk
Infer owners with git blame on changed lines when possible; otherwise use recent git log authors for the file or commit. Label them as inferred owners, and do not include email addresses.
Classify each finding as P0, P1, or P2 using references/report-template.md.
Write the final report in the user's language when practical. Keep conclusion values exactly as BLOCKED, NEEDS_CONFIRMATION, or NO_BLOCKER_FOUND.

Dirty worktree handling

By default, review only the selected committed range. Do not silently mix uncommitted or untracked changes into the release diff unless the user explicitly asks to include worktree changes.

Always report whether the worktree is dirty.
If dirty or untracked files touch release-relevant areas such as migrations, deployment config, env examples, CI/CD, secrets, cache, queues, assets, or service contracts, add a P2 confirmation item saying those changes are excluded from the committed-range review and must be committed, discarded, or reviewed separately before release.
If the user explicitly asks to include dirty worktree changes, inspect them with read-only commands such as git diff and git diff --name-status, and clearly label them as uncommitted evidence.

Evidence expectations

Every finding should cite concrete evidence:

file path and line number when available
commit hash or PR reference when line evidence is not enough
command limitation when evidence could not be collected
diff relationship, such as "schema changed but no migration file changed"

Do not state that something is safe just because no file matched a pattern. Use "not verified" for areas that cannot be confirmed from local repository evidence.

Findings versus verification limits

Separate release confirmation items from neutral tool limits:

A release confirmation item is a diff-linked production risk, such as a new env var whose production secret cannot be verified, a schema change with unclear migration status, or a new queue whose infrastructure cannot be confirmed. Classify it as P1 or P2 and set the conclusion to NEEDS_CONFIRMATION unless a P0 also exists.
An "Unable To Verify" entry is a neutral limitation, such as missing remote access or deployment platform credentials when the diff does not introduce a specific release requirement. Neutral limitations do not change the conclusion by themselves.
If a limitation blocks confirmation of a release-critical diff change, promote it to a P1/P2 finding rather than leaving it only in "Unable To Verify".
Use NO_BLOCKER_FOUND only when no P0-P2 findings or release confirmation items were found from available evidence. The report may still include neutral verification limits.

Output rules

Show P0 and P1 findings first, then P2 confirmation items.
Do not list clean checklist categories.
Include a service deployment order section only when the diff touches multiple services, asynchronous workers, migrations, queues, cache, or public contracts.
If no P0 blocker is found but P1/P2 confirmation items remain, use NEEDS_CONFIRMATION.
If no P0-P2 findings exist, include the reviewed range and any neutral verification limits.
Keep the report short enough for a release manager to act on immediately.

Test prompts

Use these prompts to validate the skill behavior:

"Run a pre-release review and tell me if this production deploy has risks."
"Review PR #123 before release. Check migrations, configs, and cache work."
"This repo has no tags. Use the default strategy and audit release readiness."
"Check v1.2.3..HEAD for backend go-live blockers."