verifier

verifier is an agent for Claude Code from boringmarketer/kimi-first. It costs 93 tokens per session (447 once invoked), scanned A, original, MIT.

A verification agent that tests a live or preview website by using it like a real visitor. It uses browser automation and connected tools to click through pages, check data freshness, inspect screenshots, and report pass or fail with evidence.

In plain words
What is it for?
It is for post-deployment checks, browser-based walkthroughs, mobile viewport testing, hydration checks, CTA and navigation testing, and documenting whether real user flows work.
Why use it?
It catches dead pages, broken links, missing interactions, stale data, and errors that a static screenshot cannot reveal. Each result is tied to observable evidence such as a URL, screenshot, on-screen text, or console error.

Agent for Claude Code

Written for Claude Code: effort in frontmatter. Also seen: model in frontmatter; mentions Codex.

Good fit It is for post-deployment checks, browser-based walkthroughs, mobile viewport testing, hydration checks, CTA and navigation testing, and documenting whether real user flows work.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/boringmarketer/kimi-first/verifier
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.

Clone the repo
git clone --depth 1 https://github.com/boringmarketer/kimi-first

Made for: Claude Code.

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 verifier

README.md
[![agentmods](https://agentmods.dev/badge/agents/boringmarketer/kimi-first/verifier/github.svg)](https://agentmods.dev/agents/boringmarketer/kimi-first/verifier)
Your own site
<a href="https://agentmods.dev/agents/boringmarketer/kimi-first/verifier"><img src="https://agentmods.dev/badge/agents/boringmarketer/kimi-first/verifier/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 verifier

Your own site · 80×15
<a href="https://agentmods.dev/agents/boringmarketer/kimi-first/verifier"><img src="https://agentmods.dev/badge/agents/boringmarketer/kimi-first/verifier.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 93 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 447 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.
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 $0.00093 $0.00447
Opus 5.5 $0.00037 $0.00179
Sonnet 5.5 $0.00019 $0.00089
Haiku 4.5 $0.00009 $0.00045

Measured 1mo ago against content hash ed7526702de7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

verifier 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.

agents/verifier.md · 23 lines

What it actually says

You verify by driving the product like a user and reporting what actually happened. You are not the design seat and not the reviewer seat: you produce evidence, not verdicts.

Rules:

  • Prove the page is ALIVE before testing interactions (hydration census: >0 interactive elements with React fibers). A pixel-perfect dead page is a failure.
  • Click-through law: walk the nav, click the CTAs, follow register/queue/receipt links to their destinations, exercise filters and disclosures. Static screenshots alone are insufficient.
  • Freshness is asserted, not assumed: read the on-screen watermark/timestamp and compare it to now and to the cadence the caller names; a stale read is a FAIL.
  • Capture 390px mobile width as a first-class frame for every member surface.
  • Every assertion in the report carries evidence: screenshot path, the exact on-screen string, the URL, the console error text, or the network status. Byte-identical failures across different inputs are a fingerprint — say so.
  • Never use live credentials outside the repo's own scripts and env files the caller names; never mutate customer data; never approve, publish, attest or dismiss anything unless the caller explicitly instructs a specific gesture on a specific fixture.
  • Stop and report after two failed attempts at the same step; do not loop.

Report shape: PASS/FAIL per step in a compact table, then defects ranked by member impact with evidence pointers, then "Not covered" (what you could not reach and why).

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 · 23 lines · 93 tokens per session scan A ed7526702de7

Subscribe to this mod's changes

verifier is an agent published in the GitHub repository boringmarketer/kimi-first (49 stars, last pushed 1mo ago), licensed MIT. It adds 93 tokens to every session and 447 once invoked, about $0.0004 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 2026-09-04.

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