Signal Diff CLI for coding agents

This post is about the signaldiff CLI: how to install it, run a local sitemap crawl, and hand that to Cursor, Copilot, or Claude Code so the agent can spot SEO and crawl issues without opening a dashboard. Signal Diff is the product behind that command. It fetches the URLs in a sitemap, checks on-page SEO and crawl health (titles, meta descriptions, redirects, slow responses, and more), and can compare a run with a baseline—often the previous deploy—so you see what changed. I already use it on this blog after each Static Web Apps release via funkysi1701/signal-diff-action . That Action is the unattended gate. The CLI is the same crawl, from a shell. (There is also a customer-hosted crawler; this post stays on the coding-agent path.) A CLI is a good fit here because coding agents already have a terminal. They can install one binary, run a crawl, and read an HTML report. You do not need a browser session, and you do not need an MCP server. Local crawls need no account. Cloud commands…