Monitor Web Pages & Email Matches with Claude + Gmail (n8n)

Turn a monitored webpage into a Claude-scored email alert (via Gmail) — on demand

This n8n workflow fetches a webpage, uses Anthropic Claude to extract listing-style items from the raw HTML, scores them against your criteria, and emails an HTML summary of the high-scoring matches through Gmail.

What this workflow does

• Manual trigger: Starts when you run the workflow manually.
• Fetch the page HTML: Uses an HTTP Request node to request the target webpage and retrieve its HTML content.
• Extract candidate items with Claude: Sends cleaned page HTML to the Anthropic Messages API (Claude) to produce a JSON list of items including title, description, link, and date.
• Score relevance with Claude: For each extracted item, calls Claude again to score match quality against your scoring criteria and generates a short justification.
• Filter by score: Keeps only items with a score of 7 or higher.
• Email results via Gmail: Builds an HTML summary of approved items and sends it using Gmail only if at least one match is found.

Use cases

• Alert your team when a webpage posts relevant listings (e.g., new opportunities, releases, or events) that meet your relevance rules.
• Rapidly test and refine extraction + scoring criteria using Claude before automating a schedule.
• Monitor a single source page and route best matches to a shared inbox for review.

Technical details

• Nodes / building blocks: manual trigger, http request, code, if, gmail, plus sticky note for guidance.
• Anthropic setup: Configure an Anthropic API key as HTTP Header Auth for the two Anthropic HTTP requests, including the required anthropic-version header.
• Customization: Update the monitored webpage URL; edit extraction/scoring criteria in the two code steps. Adjust MAX_CHARS in the extraction code step (default: 100,000).