E2e Test

E2E Manual Walkthrough

The evidence rule

Every "it works" claim in this walkthrough rests on first-hand evidence: an artifact on disk — ai-docs/e2e-output/**.txt, ai-docs/e2e-screenshots/**.png, a datastore query result — produced by you driving the live app, and read back by you afterward. A passing test suite is hearsay: a synthetic harness (TestClient, fixtures, fakes, mocked browsers) vouching for the app from inside. Hearsay is inadmissible — it misses what breaks in production: startup ordering, real network paths, real datastore constraints, real auth, real rendering. A step whose only support is a green test run is an untested step; go drive it.

The deliverables are the evidence trail and the report — plus, when you catch a bug, one regression unit test in the existing suite (see "When you find a real bug").

First-hand evidence per surface:

• CLI → Bash runs the binary; read stdout, stderr, exit code
• API → curl / httpx against the running server; read status + body
• Web UI → agent-browser clicks / fills / screenshots; Read each screenshot
• Datastore (DB / KV / files / queue) → query it directly; confirm the rows / keys / files / messages landed

Pre-flight — inventory the surfaces

Discover what this project actually exposes:

1. CLIs — [project.scripts], package.json bin, Cargo.toml [[bin]], go.mod + cmd/, user-facing Makefile / justfile targets, scripts in bin/
2. APIs / servers — framework app instantiations (FastAPI / Flask / Express / Hono / Axum / net/http / gRPC …)
3. Web UIs — frontend manifests (vite.config.*, next.config.*, index.html, a package.json with dev/start) or static HTML mounted by a backend
4. Datastores & side-effect systems — .env.example (never .env), config files, docker-compose.yml; note the client you'll query each with (psql, mysql, sqlite3, mongosh, redis-cli, aws s3 ls, ls, kafkacat, …)
5. Tooling — the package manager / runner this project actually uses (README + manifest)

Write the inventory to ai-docs/e2e-output/00-inventory.md — every later phase is scoped to it. If nothing user-facing exists, stop: "This project has no user-facing interfaces — manual E2E needs something to drive." If a web UI exists, check agent-browser availability per references/browser-recipes.md.

Phase 1 — Parallel research

Launch THREE sub-agents in parallel via the Agent tool in ONE message — app structure & journeys, datastore schema & data flows, bug hunt. Prompts in references/research-prompts.md; fill their placeholders from the pre-flight inventory. Wait for all three — their output drives every later phase.

Phase 2 — Start the app

Install deps and start each service with the project's own tooling (commands came from research), then capture the first evidence:

  &
until curl -sf http://localhost:/; do sleep 0.5; done
 --help > ai-docs/e2e-output/00-help.txt 2>&1                        # if a CLI exists
agent-browser open http://localhost:
agent-browser screenshot ai-docs/e2e-screenshots/00-initial-load.png                 # if a web UI exists

Phase 3 — Build the task list

TaskCreate one task per journey from sub-agent 1, only for surfaces that exist: [CLI] Test , [API] Test , [Web] Test , [Cross] (data flowing between two surfaces).

Then add the edge-case sweeps — full journeys in their own right, and where most real bugs live. Each recipe file defines its sweep; the task just names it:

• [CLI] Error-handling sweep — references/cli-recipes.md
• [API] Auth & validation sweep — references/api-recipes.md
• [Web] Responsive sweep — references/browser-recipes.md
• [Cross] Data consistency across interfaces — if more than one surface

Then add the probes — one [Probe] task per high-priority finding from sub-agent 3's hunt. A finding from static analysis is hearsay until you drive the suspect path in the live app and it reproduces (or fails to).

The walkthrough is complete when every task — journeys, sweeps, AND probes — is completed.

Phase 4 — Walk every journey, by hand

Per task: TaskUpdate → in_progress, then drive it yourself. Recipes for the surfaces this project has: references/cli-recipes.md, references/api-recipes.md, references/browser-recipes.md, references/db-validation.md.

Every step has the same shape:

1. Drive the interface — run the command / send the request / click the button.
2. Capture evidence — ai-docs/e2e-output//-*.txt, ai-docs/e2e-screenshots//-*.png.
3. Read the evidence back — open the output, Read the screenshot.
4. Query the datastore — whatever sub-agent 2 said this action writes, confirm it landed (references/db-validation.md).
5. Cross-interface journeys: act via A, query the datastore, read via B. Both directions.

Tag everything you create with an e2e- marker (in names, emails, titles, keys, filenames) — Phase 5 finds and removes test data by that marker.

A journey closes only on admissible evidence: every step has an artifact on disk that you read back, and the datastore confirms every expected side effect. Then TaskUpdate → completed.

When you find a real bug

Real = a defect in the app, not a flaky harness or a missing dep.

1. Document expected vs actual with evidence file paths.
2. Write a focused regression unit test in the existing suite — the only test code this skill produces; the tdd skill handles the watched-RED.
3. RED → fix via diagnosing-bugs → GREEN.
4. Re-drive the failing E2E step first-hand and capture fresh evidence.

Phase 5 — Cleanup

Kill the processes you started and agent-browser close. Then remove the test data: query the datastore for the e2e- marker, delete what it finds, and re-query — cleanup is done when the marker query returns nothing. Keep ai-docs/e2e-output/ and ai-docs/e2e-screenshots/ — that's the evidence trail.

Phase 6 — Report

Always emit a text summary in the final message:

## Manual E2E Walkthrough Complete

**Interfaces driven:** 
**Journeys walked:**  ( CLI,  API,  Web,  cross — including  edge-case sweeps and  probes)
**Datastore validation queries run:** 
**Evidence files captured:**  outputs,  screenshots
**Issues found:**  ( fixed,  remaining)

### Issues fixed during the walkthrough

- [Interface]  — `` — regression test at ``

### Remaining issues

- [Interface]  —  — ``

### Probe results

-  — confirmed (see issues above) / not reproduced — ``

### Artifacts

- `ai-docs/e2e-output/`, `ai-docs/e2e-screenshots/`

Then ask the user (via AskUserQuestion) whether to write a full ai-docs/e2e-test-report.md with per-journey breakdowns, screenshots, datastore checks, and findings. If yes, write it.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: Yassimba
• Source: Yassimba/loom
• License: Apache-2.0

Install and usage instructions live in the source repository linked above.