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tell-proof: Skill for Cursor

.cursor/skills/tell-capture-fingerprint/SKILL.md

tell-capture-fingerprint is a skill for Cursor from ashishpatill/tell-proof. It costs 54 tokens per session (562 once invoked), scanned A, original, MIT.

A project skill for capturing a rendered web page with Playwright and producing a repeatable description of its visual design and interactive states.

In plain words
What is it for?
Use it to capture screenshots, inspect computed styles, test hover and focus states, summarize page structure, and generate fixture reports.
Why use it?
It helps compare interface changes consistently without relying on network access or language models.

Skill for Cursor

Written for Cursor: installed under .cursor/.

This is ashishpatill/tell-proof's own configuration. It tells Cursor how to work on tell-proof itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything tell-proof configures →

not rated 1repo 16d ago A scan 54 tokens original MIT
View source ↗ ashishpatill/tell-proof
Reuse

Borrowing it

Nothing to install: this file belongs to ashishpatill/tell-proof. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/ashishpatill/tell-proof/master/.cursor/skills/tell-capture-fingerprint/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/ashishpatill/tell-proof

Made for: Cursor.

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 tell-capture-fingerprint

README.md
[![agentmods](https://agentmods.dev/badge/skills/ashishpatill/tell-proof/tell-capture-fingerprint/github.svg)](https://agentmods.dev/skills/ashishpatill/tell-proof/tell-capture-fingerprint)
Your own site
<a href="https://agentmods.dev/skills/ashishpatill/tell-proof/tell-capture-fingerprint"><img src="https://agentmods.dev/badge/skills/ashishpatill/tell-proof/tell-capture-fingerprint/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 tell-capture-fingerprint

Your own site · 80×15
<a href="https://agentmods.dev/skills/ashishpatill/tell-proof/tell-capture-fingerprint"><img src="https://agentmods.dev/badge/skills/ashishpatill/tell-proof/tell-capture-fingerprint.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 54 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 562 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 $0.00054 $0.00562
Opus 5 $0.00027 $0.00281
Sonnet 5 $0.00011 $0.00112
Haiku 4.5 $0.00005 $0.00056

Measured 8d ago against content hash 1541ab37d5a7, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

tell-capture-fingerprint 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 8d 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.

.cursor/skills/tell-capture-fingerprint/SKILL.md · 64 lines

How it starts

The opening of the file, as written. The whole thing — 64 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Tell capture and fingerprint

Scope

  • packages/core/src/capture/ — Playwright capture of rendered UI
  • packages/core/src/fingerprint/ — deterministic aggregation to DesignFingerprint
  • packages/core/src/scripts/capture-fixture.ts — regenerate fixture capture
  • fixtures/reports/capture.json — committed offline capture artifact

Pipeline

  1. Navigate URL (or local route); wait for network idle
  2. Full-page screenshot → base64 PNG
  3. CDP/computed-style walk on curated selectors (~200 nodes max)
  4. Interactive probes for hover, focus-visible, disabled states
  5. DOM summary: headings, buttons, centered ratio, emoji in UI chrome
  6. Emit CapturePayload validated by @tell/schema

Fingerprint fields

Aggregate fonts, colors, shadows, radii, spacing, type scale, gradient detection, near-duplicate grays, focus-ring coverage, and state coverage. No network or LLM.

Full-page capture (stitched)

When a page is taller than one viewport or uses lazy/sticky stages:

  1. Prefer Playwright fullPage: true screenshot as the primary artifact
  2. Scroll the document once before capture so lazy sections mount
  3. After fonts and sticky measurements settle, re-measure and capture again if the first pass clipped
  4. Keep the same URL and viewport width for before/after proof compares
  5. Never claim a stitched panorama if only the fold was captured — set meta honestly

Rules

  1. Capture may use Playwright; unit tests must use committed JSON only
  2. Keep capture normalization stable between runs
  3. Any capture schema change requires updating committed capture.json
  4. Web diagnose subprocess uses diagnose-url.ts; MCP uses captureUrl directly

Commands

pnpm dev:fixture          # bland demo app on :3001
pnpm capture:fixture      # regenerate capture.json
pnpm diagnose:fixture     # full diagnose on fixture
pnpm test                 # fingerprint/detector golden tests

DoD

  • Valid CapturePayload for generic fixture
  • Fingerprint snapshot fields stable enough for detector golden tests
  • Capture completes in demo time budget (< 8s on fixture)

Read the full file on GitHub · 64 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. 8d ago First seen · 64 lines · 54 tokens per session scan A 1541ab37d5a7

Subscribe to this mod's changes

tell-capture-fingerprint is a skill published in the GitHub repository ashishpatill/tell-proof (1 stars, last pushed 16d ago), licensed MIT. It adds 54 tokens to every session and 562 once invoked, about $0.0003 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 2026-09-03.

CSS and stylingE2E testingFrontendTestingaicursordesign-criticdesign-systemsdeveloper-tools
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