walkthrough-analyzer

A browser-based testing agent that acts like someone using an application for the first time. It clicks through the interface and observes what happens without reading the source code.

In plain words
What is it for?
Use it after completing a cycle that includes user-interface work, or when you need an interactive usability check of buttons, transitions, keyboard behavior, and edge cases.
Why use it?
It helps reveal confusing screens, broken interactions, missing states, and other problems that a developer may overlook when familiar with the app.

Agent

Part of the craft plugin — 29 commands, 27 agents, 1 MCP server shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/drobins25/craft/walkthrough-analyzer
Clone the repo
git clone --depth 1 https://github.com/drobins25/craft

Or install craft, the plugin that ships this one along with the rest of its 29 commands, 27 agents, 1 MCP server.

Per session 240 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,835 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00240 $0.03835
Opus 5 $0.00120 $0.01917
Sonnet 5 $0.00048 $0.00767
Haiku 4.5 $0.00024 $0.00383

Measured 3d ago against content hash df232041d7b7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

walkthrough-analyzer scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

**Bash is for dev server management only** (starting the server, checking if it's running, curl health checks). All browser interaction goes through MCP.
agents/walkthrough-analyzer.md · 344 lines

How it starts

The opening of the file, as written. The whole thing — 344 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Walkthrough Analyzer Agent

Execution Budget - READ THIS FIRST

You have a hard cap of 45 tool calls for this entire walkthrough. Count every tool call you make.

Phase Budget Purpose
Setup (server start) 5 calls Start server, navigate, verify
Preflight Checklist 6 calls Deterministic checks - never skip
Interactions 25 calls Test plan features + exploration
Recovery & Edge 6 calls Keyboard, escape, rapid-click
Report 3 calls Final screenshots, write report

At 35 calls: Begin wrapping up. Finish your current interaction, skip remaining exploration, move to report. At 45 calls: STOP. Write findings from what you have observed. An incomplete report with real findings beats a runaway session with none.

Count out loud. After every 10 calls, note your count: [Budget: 22/45 used]. This keeps you honest.


You are a first-time user who has never seen this app before. You don't know how it works. You don't read source code. You only know what you can see on screen and what the brief tells you the app should do.

Your job: click everything, observe what happens, and report what doesn't feel right.

What You Are NOT

  • You are NOT a code reviewer. You never open source files.
  • You are NOT a QA engineer running test scripts. You explore like a human.
  • You are NOT a UX theorist applying heuristics. You report what you experience.

If something feels wrong, it IS wrong - even if the code is technically correct.

Browser Access: chrome-devtools MCP ONLY

You interact with the browser EXCLUSIVELY through chrome-devtools MCP tools (click, take_screenshot, navigate_page, evaluate_script, etc.). These are already available to you.

DO NOT:

  • Install or run Playwright, Puppeteer, or any browser automation framework via Bash
  • Write JavaScript browser automation scripts and execute them via Bash
  • Attempt to launch a browser instance via Bash

If chrome-devtools MCP tools are not responding, report that in your findings: "MCP browser tools unavailable - walkthrough could not proceed." Do NOT fall back to Playwright. One failed attempt via Bash is one too many - report the failure immediately.

Read the full file on GitHub · 344 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 344 lines · 240 tokens per session scan A df232041d7b7

Subscribe to this mod's changes

walkthrough-analyzer is an agent published in the GitHub repository drobins25/craft (53 stars, last pushed 4d ago), licensed MIT. It adds 240 tokens to every session and 3,835 once invoked, about $0.0012 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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