# Verifying Changes

> Concrete, per-area proof that a change actually works before reporting it fixed, done, or "should work now" — which dev server, test command, or invocation proves a template UI change, an action, a migration, a guard, or a core/package change. Use before every wrap-up, and before stopping mid-task to ask permission instead of continuing.

- Skill: `builderio/verifying-changes` (Agent Skill)
- Install (CLI): `npx skillmds@latest add builderio/verifying-changes`
- Raw SKILL.md: https://api.skillmd.com/api/skills/builderio/verifying-changes/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Productivity
- Author: Builder.io (https://skillmd.com/u/builderio)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/builderio/verifying-changes

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# Verifying Changes

## When this applies

Before telling the user a fix, feature, or bug is done, choose the smallest
proof that exercises the behavior you changed and use the row below as a guide.
"I changed the code and it looks right" is not proof — it's the exact gap this
skill exists to close. A failing check is a reason to keep working, not a reason
to stop, ask, or report done anyway.

## Scale the verification

Verification proves the changed behavior; it is not a reason to run a broad
workspace audit after every edit.

- For a localized one-line or small-file change, inspect the diff and run the
  narrowest relevant test, typecheck, formatter, or direct invocation. Do not
  run `pnpm run prep`, browser automation, or restart a dev server unless the
  changed area requires it.
- For an action or capability-card change, use the focused action/card check.
  Restart only when the runtime process must reload registration or the change
  explicitly affects startup.
- Escalate to package-wide tests or `pnpm run prep` for shared contracts,
  cross-cutting changes, migrations, or when a focused check exposes a wider
  failure. Keep repository-required guards and doctor checks when they apply.
- If a focused check is unavailable, state the exact gap rather than replacing
  it with unrelated expensive work.

## Do NOT report done in these situations

- The change is "obviously correct" or one line — obvious fixes are the ones
  that ship broken most often; run the smallest relevant proof anyway.
- You verified a similar path earlier in the session — re-run against the
  actual latest edit, not a memory of an earlier pass.
- The user didn't explicitly ask you to test it — test it anyway; verify-
  before-done is a standing rule here, not an opt-in.
- The full test suite is slow or flaky — run the targeted command for the
  changed area (below) instead of skipping verification entirely.
- You're mid-task and unsure whether to keep going — keep going. Only stop for
  a missing credential, an ambiguous decision only the user can make, or a
  destructive action that needs confirmation. Silence from the user means
  keep working, not pause and wait.
- You genuinely cannot run anything — say so out loud (see below); never let
  "unverified" read as "done".

## Proof by area

| You changed | What proves it | Command |
| --- | --- | --- |
| Template UI/behavior (`templates/<app>/app/**`) | Drive the real page and check console + network, not just the diff | `pnpm --filter <app> dev` (or root `pnpm dev` for the gateway), then click through the exact flow with whatever browser tool is available; check for console errors and failed (4xx/5xx) requests on that page |
| An action (`templates/<app>/actions/*.ts`) | Call it with representative args and inspect the real return value | `cd templates/<app> && pnpm action <name> --key value`; for a write, follow with `pnpm action db-query --sql "SELECT ..."` to confirm the row actually landed |
| Schema/migration | Boot the app so migrations run, then read back the new column/table | `pnpm --filter <app> dev` once, then `cd templates/<app> && pnpm action db-query --sql "..."` (`action` is a per-template script, not a root one); `pnpm guard:additive-migrations` catches destructive DDL before CI does |
| A guard/lint script (`scripts/guard-*.{mjs,ts}`) | Run it directly against a case that should now pass and one that should still fail | `pnpm guard:<name>` (name matches the `package.json` script); `pnpm guards` for the full sweep |
| `packages/core` or another publishable package | Run that package's actual tests, not just typecheck | `pnpm --filter @agent-native/core exec vitest --run <changed.spec.ts>`, or `pnpm test:core-integration` for cross-cutting paths |
| Cross-cutting change, or unsure which area | Workspace-wide pass | `pnpm run prep` (fmt + typecheck + `test:fast` + `guards`, run in parallel) |
| Anything you deployed | The deploy succeeding is not the check. Exercise the live path itself | Hit the real URL or replay the real request against the deployed environment, then read that environment's logs; a green deploy with a still-broken path is the single most repeated false "done" |
| Docs only (`.md`, `AGENTS.md`, `SKILL.md`) | Nothing to run | Say "docs-only, no runtime check applies" — don't invent a verification step |

For any user-visible change, put the proof in the reply: a screenshot of the
surface you just drove, or the actual query result / log line for backend work.
"Show me screenshots" is a standing expectation, not a special request.

`pnpm test:fast` excludes `.db.test.ts` / `.integration.*` / `.e2e.*` /
`.live.*` / `.perf.*` suites. If your change touches one of those, name and
run that specific file — `test:fast` passing does not cover it.

## Production forensics

When inspecting production runs, query interactive and scheduled/background
work as separate populations before summarizing reliability. Report both
`id NOT LIKE 'job-%'` and `id LIKE 'job-%'` (or the repo's current equivalent),
including app, run count, completed count, failure count, and top terminal
reasons for each slice. A healthy interactive sample does not prove scheduled
jobs work.

## When you can't verify

State it plainly and name what would close the gap: "I could not run this —
verifying it needs `<command>` or a browser check of `<page>`." Never write
"should be fixed" or "this resolves it" without having actually run the check
above.

## Real failures this replaces

- "still getting it friend. this is the third time you said you fixed it when
  you didn't. please reproduce end to end and verify"
- "did you test end to end? can you do so in the browser and confirm?" — asked
  on nearly every wrap-up before this rule existed
- "ok so should work now?? i am getting sick of saying 'try this' and it still
  not working. you confident?"
- "my analytics dashboards ALWAYS fail ... i have asked agents to fix this for
  weeks at least 10x and they always say they did and then the emails keep
  failing"
- "WHY THE FUCK DO YOU KEEP STOPPING" / "sorry what is still queued? you
  should be doing everything now don't queue" — stopping mid-task instead of
  finishing and verifying