agentmods.dev

diagnosing-inp

diagnosing-inp is a skill for Claude Code from corewebvitals/cwv-superpowers. It costs 85 tokens per session (2,300 once invoked), scanned A, original, MIT.

A workflow for investigating Interaction to Next Paint (INP), a measure of how quickly a webpage responds after someone interacts with it.

In plain words
What is it for?
Use it to identify sluggish buttons or controls, inspect responsible scripts, separate waiting, processing, and display delays, and review recent trends.
Why use it?
It helps connect slow clicks or taps to the affected page element, scripts running at the time, and the stage causing the delay.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Part of the cwv-superpowers plugin — 6 skills, 1 hook shipped together

not rated 12repo 2mo ago A scan 85 tokens original MIT

Good fit Use it to identify sluggish buttons or controls, inspect responsible scripts, separate waiting, processing, and display delays, and review recent trends.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/corewebvitals/cwv-superpowers/diagnosing-inp
View source ↗ corewebvitals/cwv-superpowers
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 corewebvitals/cwv-superpowers --skill diagnosing-inp
Clone the repo
git clone --depth 1 https://github.com/corewebvitals/cwv-superpowers

Made for: Claude Code.

Or install cwv-superpowers, the plugin that ships this one along with the rest of its 6 skills, 1 hook.

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 diagnosing-inp

README.md
[![agentmods](https://agentmods.dev/badge/skills/corewebvitals/cwv-superpowers/diagnosing-inp/github.svg)](https://agentmods.dev/skills/corewebvitals/cwv-superpowers/diagnosing-inp)
Your own site
<a href="https://agentmods.dev/skills/corewebvitals/cwv-superpowers/diagnosing-inp"><img src="https://agentmods.dev/badge/skills/corewebvitals/cwv-superpowers/diagnosing-inp/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 diagnosing-inp

Your own site · 80×15
<a href="https://agentmods.dev/skills/corewebvitals/cwv-superpowers/diagnosing-inp"><img src="https://agentmods.dev/badge/skills/corewebvitals/cwv-superpowers/diagnosing-inp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 85 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,300 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 $0.00085 $0.02300
Opus 5 $0.00043 $0.01150
Sonnet 5 $0.00017 $0.00460
Haiku 4.5 $0.00009 $0.00230

Measured 9d ago against content hash 46b7fb21c04d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

diagnosing-inp 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 9d 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.

plugins/cwv-superpowers/skills/diagnosing-inp/SKILL.md · 173 lines

How it starts

The opening of the file, as written. The whole thing — 173 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Diagnosing INP

Invocation

Called by the cwv-superpower orchestrator at Step 2B, or invoked directly when the user names INP as the target metric.

Inputs: a target filter (ff or u with value) and a device (default: mobile).

Progress: Print these ↳ sub-status lines as you execute each call:

   ↳ Identifying slow interaction element...
   ↳ Finding responsible scripts (LOAF)...
   ↳ Checking interaction load state...
   ↳ Breaking down INP phases...
   ↳ Analyzing distribution shape... (if warranted)
   ↳ Checking 7-day trend...

Attribution calls

All calls use the provided [FILTER_KEY]/[FILTER_VALUE] placeholders for page filtering and d=mobile (or specified device).

  1. get_metrics with group: "inpel" filtered by [FILTER_KEY]=[FILTER_VALUE], device. Returns the slow interaction element (CSS selector). Note all segments — sometimes multiple elements have poor INP (e.g. a carousel button AND a hamburger menu). Each may have a different root cause.

  2. get_metrics with group: "lurl" filtered by [FILTER_KEY]=[FILTER_VALUE], device. Returns LOAF script URLs — the scripts running Long Animation Frames during slow interactions. For each URL, determine: first-party or third-party? Cross-reference with inpel results — e.g. carousel.bundle.js + button.carousel-next = near-certain match between script and element.

  3. get_metrics with group: "inpls" filtered by [FILTER_KEY]=[FILTER_VALUE], device. Returns the load state when the interaction happened. Possible values: loading, dom-interactive, dom-content-loaded, complete.

    • If loading or dom-interactive: script loading order problem — the page was still parsing when users interacted. Users click/tap before the page is ready.
    • If complete: event handler code problem — the page was fully loaded, so the slowness lives in the handler logic itself.

Breakdown calls

One call: get_metrics with metrics: "INPUTDELAY,PROCESSING,PRESENTATION" filtered by [FILTER_KEY]=[FILTER_VALUE], device.

Read the full file on GitHub · 173 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. 9d ago First seen · 173 lines · 85 tokens per session scan A 46b7fb21c04d

Subscribe to this mod's changes

diagnosing-inp is a skill published in the GitHub repository corewebvitals/cwv-superpowers (12 stars, last pushed 2mo ago), licensed MIT. It adds 85 tokens to every session and 2,300 once invoked, about $0.0004 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 2026-08-30.

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