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open-coder-ai/block-unapproved-egress

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Best-effort guard on the tool channel: blocks sending data to a host outside the allowlist (.chock/egress-allowlist.txt, else a built-in registry list): curl/wget/iwr uploads, nc/socat/telnet, scp/rsync/sftp, ssh commands, aws/gsutil/az uploads, git push|remote add URLs, $(..)/$VAR in a URL or host. Asks on interpreter HTTP one-liners, gh gist/--body-file, curl --proxy/--resolve/Host:. Blocks ~/.curlrc writes. A floor, not a sandbox: other clients, runtimes, obfuscation. [Session-enforced by the PreToolUse hook under com.github.copilot/ in clients that read that namespace (documented for VS Code agent mode); a client that ignores it, as the Agent Plugins spec tells generic clients to, gets the advisory skill only. The hook needs git, a usable bash and a Python 3.11+ (python3, python or py, whichever actually runs). With no working Python it exits 2; without git or bash, fail-open clients allow silently and fail-closed clients refuse matched commands. If the guard itself crashes or times out, the hook asks for confirmation rather than allowing silently -- VS Code agent mode honours that ask and it overrides the client's own auto-approve.]