Arcjet has launched a security layer for coding agents that monitors session activity in real time using Cloudflare Clef, Cloudflare's decision model. Built on Cloudflare Workers with Durable Objects storing per-session state, the system flags tainted sessions when it detects prompt injections, PII, or credential-theft patterns. It integrates via hooks with tools including GitHub Copilot. Arcjet tested both Clef options and selected Clef Flash because the review runs frequently.
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