Claude Code has been putting users' emails into web request User-Agent headers
Fathom reports Claude Code injects the signed-in account email into model instructions, and users caught it appearing in User-Agent headers on requests to sites like the SEC, Wikipedia, and crates.io—mostly via sub-agents. Anthropic added a permission check in 2.1.317 (Nov 2) that asks before web or shell calls send that address to the network.
