Preserve what you observed, when and where you observed it, and how you collected it. Save the exact URL, capture the page promptly, record the capture time and timezone, and retain relevant logs or platform records through authorized channels. A screenshot can show what appeared on screen, but it does not prove that an AI agent caused an action; keep that attribution labeled as a suspicion unless separate evidence supports it.
What to preserve—and what it can show
Treat the incident as two separate questions: what the website displayed or did, and who or what caused it. A captured page can help document the first. By itself, it generally cannot establish the second.
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- Visual record: A screenshot records the rendered view at capture time, but not the site’s interactive behavior or complete underlying content.
- Web capture: Where feasible, preserve a replayable archive of the page and its linked resources. The National Archives describes website snapshots accompanied by site maps and notes that permanent web records should retain hypertext functionality. That guidance was written for federal agency records, so its legal duties do not automatically apply to private parties: NARA web-records guidance.
- Supporting records: Relevant browser, platform, account, or server logs may add context, but access them only through authorized channels and preserve them promptly if they may be overwritten or retained briefly.
No single capture method guarantees a complete record. The Library of Congress identifies WARC as its preferred web-archive format and recommends non-proprietary capture output, while cautioning that some multimedia, streaming, deep-web, and database material may not be captured by current tools: Recommended Formats Statement.
Capture the page and its context promptly
- Record how you found it. Write down the exact URL, the route or steps that led to the page, and what you observed. Preserve relevant volatile records quickly where appropriate; CISA’s recommendation to prioritize limited-retention evidence is part of incident-response guidance and should be applied selectively: CISA #StopRansomware Guide.
- Capture the page as displayed. Save a screenshot that includes the relevant content and enough surrounding context to make it understandable. Do not crop or annotate the original; make a separate working copy if you need to highlight details for review.
- Make a web archive when feasible. Prefer an archive that retains page resources and links when the content needs to be revisited or examined. WARC is a non-proprietary web-archive format used by the Library of Congress. The Library’s format descriptions discuss capture metadata and limits: WARC format description.
- Record collection details. Note the capture date and time with timezone, source URL, collection method and tool, operator, and relevant response information such as an HTTP status if available. WARC can carry harvest time and response code; CDX index records can include an original URL, GMT timestamp, HTTP status, and payload digest: CDX format description.
- Document gaps. Note resources that did not load, content behind authentication, missing media, errors, or other limitations. Do not imply that an incomplete capture represents the whole site.
Choose a capture method that fits the evidence
| Method | Useful for | Important limitation |
|---|---|---|
| Screenshot | A legible visual record of the rendered page at a particular moment. | Does not preserve functionality or prove who caused the displayed state. |
| Web archive, preferably WARC where suitable | Retaining a page and available resources for later review or replay. | Dynamic, authenticated, streaming, database-backed, or otherwise inaccessible content may be absent. |
| Authorized platform or system records | Adding operational context that a page capture cannot supply. | Availability, retention, and lawful access depend on the relevant system and policy; a record’s presence does not alone establish agent identity. |
Consider fidelity, context metadata, coverage of dynamic or authenticated content, integrity controls, and whether collection is authorized. The Library of Congress recommends capture metadata and describes practical format limitations in its format guidance.
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Protect the files and document their handling
- Keep the original captured files in a controlled location and make separate working copies for review.
- Record who collected, accessed, transferred, or stored the files, with dates and times. For a matter that may be formally reviewed, maintain an appropriate chain-of-custody record; NIST defines relevant forensic concepts in its digital-forensics glossary.
- Use a cryptographic hash or digital signature to check whether a later copy is identical to the preserved file. A matching hash supports copy-integrity checking; it does not prove when the file was created or that the captured content was truthful. NIST discusses hash and signature verification for digital evidence in NISTIR 8387.
- Keep notes about the tool, settings, and any failed or partial captures alongside the files.
NISTIR 8387 provides general digital-evidence preservation guidance, not a validated test for identifying AI agents. NIST SP 800-86 likewise describes forensic process and incident-response context, and says it is not an all-inclusive forensic procedure or legal advice: NIST SP 800-86.
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ScreenshotNeo can capture a page with one request. See the ScreenshotNeo documentation for API details. For example, this cURL request saves a WebP screenshot:
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.webpScreenshotNeo accepts cookie or consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each step can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, and the response indicates the page verdict and billing status in headers. Its MCP server provides screenshot and page-information tools for AI agents. The free plan includes 1,000 screenshots per month with no card required.
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Troubleshooting incomplete or questionable captures
- The page is blank or partly loaded: Record the result and the time, then note the limitation. If authorized and appropriate, try a separate capture or preserve relevant logs; do not silently replace the original attempt.
- Images, scripts, or media are missing from the archive: Document what is absent. Some dynamic, streaming, deep-web, and database content may not be preservable with available tools, as the Library of Congress guidance explains.
- A capture cannot be replayed: Keep the original files and metadata, and record the tool and failure. A screenshot remains a visual record even when a functional archive is unavailable.
- You need to prove who acted: A page capture is not an attribution test. Seek relevant platform or system records through authorized procedures and distinguish directly observed facts from your hypothesis. NIST’s guidance is general digital-forensics context, not a specific AI-agent attribution method: NIST SP 800-86.
Describe conclusions carefully
In notes or a report, separate the observation from the explanation: for example, state that a particular page displayed specified content at a recorded capture time, then separately say that AI-agent activity is suspected and identify what supports that suspicion. These preservation sources do not establish a method for proving that an AI agent performed a particular action. Follow applicable law, organizational policy, and platform terms; seek qualified professional advice if the matter may become a formal investigation or dispute.
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