Bug fix with a regression-test cycle

Case study in full

Reference run

Three commits, no manual intervention, about 24 minutes — fix and regression test are ready for review as a pull request.

Stack profile: php-laravel-13 · Measured: Aug 31, 2026 (one run, ~24 minutes) · Data origin: Reference run of Aug 31, 2026, figures from the run’s frozen usage snapshot.

A Laravel audio-processing application normalises loudness in two passes: measure first, then apply. The second FFmpeg pass ran without linear mode, the measurement had no effect and the material sounded “pumped”. The bug sat as a ticket in the internal tracker; a test capturing it was missing.

What stays with your team: Whether a bug is reproducible and relevant is your team's call. Approving the fix and accepting it before the merge stay with you.

What you need

A reproducible bug report in the tracker.
A stack profile with the project's test commands.
Guardrails with a test obligation for bug fixes.
Approval that the fix including a regression test may run.

How the run works

The bug report becomes the plan; stack detection recognises the PHP codebase and works in the existing files, no foreign scaffold.
The fix switches the second pass to linear mode and extracts the filter construction into an independently testable method.
A reconciliation step brings the dependent callers in line: six files across job, controller and Livewire layers.
A Pest regression test pins down the filter graph of the second pass for good.
Three commits go to the repository as a pull request; the ticket-surface check reports no missed path.

The trail of the run

Ticket
The loudness bug sits in the internal tracker as a reproducible report; a test capturing it is still missing.
Plan
The report becomes a plan of three slices; stack detection recognises the PHP codebase and works in the existing files.
Slice 1 — Fix
The second pass runs in linear mode, the filter construction becomes an independently testable method. One commit.
Slice 2 — Callers in line
The dependent callers follow: six files across job, controller and Livewire layers. One commit.
Slice 3 — Regression test
A Pest test pins down the filter graph of the second pass for good. One commit.
tests/Unit/AudioProcessingLoudnormTest.php
Pull request
Three commits go to the repository as a pull request; the ticket-surface check reports no missed path. After about 24 minutes the story stands at “to verify” — your review begins.

What you get

Three commits in the PHP codebase: fix, callers brought in line, Pest regression test (tests/Unit/AudioProcessingLoudnormTest.php).
The run’s trace — plan, three slices, checks — stands below station by station; authorised members find the run in the cockpit.
After about 24 minutes the story stood at “to verify”, ready for your review.

Key figures

Scope

Stories/tickets: 1
Slices: 3
Files/modules: 7

Throughput

Validated slices: 3
Retries: 3
Human interventions: 0

Quality

Checks run: Guardrails, Flächen-Abgleich, Composer, Pest
Gates passed: 0
Gates failed: 0

Resources

Prompt tokens: 184
Completion tokens: 88309
Cache tokens: 11467517
Model calls: 5
Sandbox runtime: 0.1 minutes
Model/stack context: Stack: PHP with Laravel 13 (profile php-laravel-13). Agentic CLI profile (Opus), one end-to-end run in about 24 minutes; the prompt load ran almost entirely through the context cache.

What stayed open

The sandbox could not execute the Pest test: the verification image lacked PHP. The run reported that openly instead of claiming green; the test is traceable in the pull request, and PHP is on the image’s list.