mismatch-diagnoser

mismatch-diagnoser is an agent for Claude Code from voidmatcha/ui-clone-skills. It costs 109 tokens per session (281 once invoked), scanned A, original, Apache-2.0.

A coding-agent role that investigates why a web-page implementation failed one of several checks, such as matching layout boundaries or fonts. It returns one likely underlying cause as structured data and does not change code.

In plain words
What is it for?
Use it after implementation, boundary, font-matching, or section-comparison checks fail. It examines the failure data, source code, and reference files to identify one root cause.
Why use it?
It turns a failed check into a focused explanation, so the implementation agent knows what to investigate instead of trying unrelated fixes.

Agent for Claude Code

Installs and runs on its own, but its text points at files inside its plugin — anything it tells you to read at a ${CLAUDE_PLUGIN_ROOT} path is only there once the plugin is installed. Installing the plugin gets both.

Part of the ui-clone-skills plugin — 4 skills, 6 agents, 6 hooks 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/voidmatcha/ui-clone-skills/mismatch-diagnoser
Clone the repo
git clone --depth 1 https://github.com/voidmatcha/ui-clone-skills

Made for: Claude Code.

Or install ui-clone-skills, the plugin that ships this one along with the rest of its 4 skills, 6 agents, 6 hooks.

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 mismatch-diagnoser

README.md
[![agentmods](https://agentmods.dev/badge/agents/voidmatcha/ui-clone-skills/mismatch-diagnoser.svg)](https://agentmods.dev/agents/voidmatcha/ui-clone-skills/mismatch-diagnoser)
Your own site
<a href="https://agentmods.dev/agents/voidmatcha/ui-clone-skills/mismatch-diagnoser"><img src="https://agentmods.dev/badge/agents/voidmatcha/ui-clone-skills/mismatch-diagnoser.svg" alt="Measured on agentmods" height="20"></a>
Per session 109 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 281 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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 $0.00109 $0.00281
Opus 5 $0.00055 $0.00140
Sonnet 5 $0.00022 $0.00056
Haiku 4.5 $0.00011 $0.00028

Measured 5d ago against content hash ec1c55213fc3, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

mismatch-diagnoser 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 5d 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.

.claude-plugin/agents/mismatch-diagnoser.md · 15 lines

What it actually says

Resolve plugin root as ${PLUGIN_ROOT:-${CLAUDE_PLUGIN_ROOT:-$(cat "$HOME/.config/ui-clone-skills/root" 2>/dev/null)}} if $PLUGIN_ROOT is unset.

Read $PLUGIN_ROOT/skills/ui-reverse-engineering/diagnosis.md and follow the "Sub-agent / inline-diagnosis contract" section at the end.

The Root Cause A-R catalog is the canonical source. Codex hosts use the native mismatch-diagnoser role from .codex/agents/mismatch-diagnoser.toml when available, with inline fallback only when no delegated-worker surface exists. Your output JSON schema is identical across hosts, ensuring cross-host parity.

Do not apply fixes. Return diagnosis only.

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. 5d ago First seen · 15 lines · 109 tokens per session scan A ec1c55213fc3

Subscribe to this mod's changes

mismatch-diagnoser is an agent published in the GitHub repository voidmatcha/ui-clone-skills (9 stars, last pushed today), licensed Apache-2.0. It adds 109 tokens to every session and 281 once invoked, about $0.0005 per session on Opus 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 2026-08-31.

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