verify-behavior

verify-behavior is a skill for Claude Code, Codex from nicknisi/dotfiles. It costs 68 tokens per session (1,824 once invoked), scanned A, original, MIT.

A procedure for checking whether a product behaves correctly by using its real user interface. It covers reproducing reported bugs and verifying implemented changes with recorded interface state.

In plain words
What is it for?
Use it to reproduce interface bugs, confirm feature fixes, and review visible workflows such as browser interactions.
Why use it?
It replaces assumptions based only on source code with evidence from the running application.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to reproduce interface bugs, confirm feature fixes, and review visible workflows such as browser interactions.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/nicknisi/dotfiles/verify-behavior
About the project

nicknisi/dotfiles is a personal collection of configuration files and setup scripts for tools such as Neovim, zsh, Git, tmux, and Homebrew. It helps its author bootstrap and maintain a development machine, with a devcontainer for checking portable terminal settings. The catalogue entries extend the repository’s setup and coding-agent workflow.

nicknisi/dotfiles · 3,002 stars · on GitHub

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.

Any agent
npx skills add nicknisi/dotfiles --skill verify-behavior
Clone the repo
git clone --depth 1 https://github.com/nicknisi/dotfiles

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for verify-behavior

README.md
[![agentmods](https://agentmods.dev/badge/skills/nicknisi/dotfiles/verify-behavior/github.svg)](https://agentmods.dev/skills/nicknisi/dotfiles/verify-behavior)
Your own site
<a href="https://agentmods.dev/skills/nicknisi/dotfiles/verify-behavior"><img src="https://agentmods.dev/badge/skills/nicknisi/dotfiles/verify-behavior/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for verify-behavior

Your own site · 80×15
<a href="https://agentmods.dev/skills/nicknisi/dotfiles/verify-behavior"><img src="https://agentmods.dev/badge/skills/nicknisi/dotfiles/verify-behavior.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 68 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,824 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Prompt Injection · line 21
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
How audits are shown
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 5.1 $0.00068 $0.01824
Opus 5.5 $0.00027 $0.00730
Sonnet 5.5 $0.00014 $0.00365
Haiku 4.5 $0.00007 $0.00182

Measured 1mo ago against content hash ad5bb96cc460, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

verify-behavior scanned grade A with 0 findings 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 1mo 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

home/.pi/agent/skills/verify-behavior/SKILL.md · 122 lines

How it starts

The opening of the file, as written. The whole thing — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Verify behavior

Prove or disprove visible product behavior for bugs and greenfield features using pi-computer-use. Triage, implementation, and review stages invoke this instead of guessing from code alone.

Modes

  • reproduce — does the reported bug still happen on baseline? (usually default branch; triage)
  • verify — does the implemented change match expected behavior? (features and fixes; implementation/review)

Infer if unnamed: issue-only → reproduce; implementation/PR branch → verify.

Platform contract (do not invent alternatives)

pi-computer-use exposes a direct, state-scoped tool surface, not a delegated capability and not raw screen capture. The normal loop:

Step Tools
Find find_roots returns ranked @r roots (desktop windows and CDP browser pages share one forest). launch_browser for a managed CDP page.
Observe observe_ui captures a root and returns a folded outline, @e refs, and a stateId. Every later @e use requires its owning stateId.
Query search_ui, expand_ui, inspect_ui, and read_text query the cached state without re-capturing. Refine broad searches instead of paging matches.
Act act_ui performs checked, transactional steps and returns the successor stateId. Attach expect when the action has an observable completion signal.
Wait wait_for for asynchronous UI changes; navigate_browser / evaluate_browser only on CDP page states.

Consume the successor stateId from act_ui directly; observe again only after an uncertain external mutation or state eviction.

Read the full file on GitHub · 122 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. 1mo ago First seen · 122 lines · 68 tokens per session scan A ad5bb96cc460

Subscribe to this mod's changes

verify-behavior is a skill published in the GitHub repository nicknisi/dotfiles (3,002 stars, last pushed 2d ago), licensed MIT. It adds 68 tokens to every session and 1,824 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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