a4sx — Agent Session Exchange

a4sx is a private library and an open marketplace for AI agent work sessions. Stop starting every agent session from scratch: keep what a good session learned. Save a session from Claude Code or another agent harness, resume it later on any machine, branch it, and share, buy or sell proven sessions as reusable starting points.

Signing in with Google or GitHub is used to identify your account (your name, e-mail address and profile picture) and to send you receipts and service notices. Browsing the marketplace needs no account.

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a4sx is a product of crossVault GmbH.

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