{"uid":"cap_v-tWQyrilTl6OP9Jutdoj","slug":"screenshot-evidence-check-f7ec3598","name":"Screenshot Evidence Check","description":"Screenshot Evidence Check — Reads a description of how a web page was captured or measured - a headless browser capture with a window size, a tall screenshot, a document width reading, a local Lighthouse run, a PageSpeed Insights run, an automation session that has been open for hours, a command-line download size on Windows - and says what that evidence proves, what it cannot prove and the one measurement that would decide, answered as JSON with a verdict. Knows the ways the capture itself pro…","url":"https://api.aiskills402.com/v1/skills/screenshot-evidence-check/file?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"ok":true,"file":{"name":"SKILL.md","content":"<the SKILL.md file>","encoding":"utf-8"},"name":"Screenshot Evidence Check","skill":"screenshot-evidence-check","sha256":"<sha256 of SKILL.md>","receipt":{"tx":"0x<settlement transaction>","settled":true},"version":"1.0.0","redownload":{"url":"<api>/v1/purchases/<token>","token":"<64 hex chars>"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.03","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.03/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_nLBJRy01nRu7RT-EuGIeq","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.03","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Analyzes a description of how a web page was captured or measured and returns a JSON verdict on what that evidence proves, what it cannot prove, and the single measurement that would be decisive.","exampleAgentPrompt":"I captured our landing page using a headless browser at 1280x800 window size and took a full-page tall screenshot — can you tell me what that actually proves about the page layout, what it can't prove, and what single measurement would settle the question?","exampleUseCases":[{"title":"Validating Lighthouse audit evidence","prompt":"I ran a local Lighthouse audit on our checkout page and got a 92 performance score — what does that actually prove, what can't it prove about real user experience, and what one measurement would be more decisive?"},{"title":"Checking headless screenshot reliability","prompt":"Our QA bot takes a 1920x1080 headless Chrome screenshot of every page after deploy — can you tell me what that screenshot evidence actually proves about rendering, what edge cases it misses, and what test would definitively confirm correct display?"},{"title":"Assessing PageSpeed evidence for a client report","prompt":"I ran a PageSpeed Insights check on a client's homepage and got a green score — what does that prove and what doesn't it prove, and what's the one measurement I should add to make the evidence airtight?"}],"resultDescription":"A JSON object containing a verdict field, a description of what the described capture method proves, what it cannot prove, and the single most decisive follow-up measurement that would resolve remaining uncertainty about the web page capture or measurement.","failureModes":["Ambiguous or vague capture description may produce an inconclusive verdict","Descriptions of unsupported or unknown measurement tools may result in a generic analysis","Missing key parameters (e.g. window size or tool name) may reduce verdict accuracy","Payment failure via x402 returns 402 status and no content"],"whenToPreferThis":"Choose this endpoint when an AI agent or QA engineer needs to reason about the validity and limitations of a specific web page capture or performance measurement — especially when the capture method introduces biases or blind spots (headless browser, tall screenshot, automation session age, OS-specific tools). Prefer over generic QA or performance APIs when the goal is epistemological: not what the page looks like, but what the evidence proves.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-27T18:51:45.452Z","isFirstParty":false,"canonicalSlug":"screenshot-evidence-check-f7ec3598"}