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.

Agent Session Exchange

Stop starting every agent session from scratch.

Keep what a good agent session learned: resume it on any machine, branch it, and share it as a starting point for the next one.

RESUME: Pick up where it left off.

BRANCH: Start new work from a proven base.

SHARE: Build on each other’s sessions.

Why keep the dead ends — Unfinished sessions and failed attempts carry knowledge you can branch from, share or sell, and it is worth the most now.
A company your agent can run — A simulated company that keeps running. Point your agent at it, propose an automation, get a measured KPI delta back.
What is an agent session? — What a coding agent's session holds, why it is lost when the work moves on, and what resuming and branching mean.
How selling your sessions works — What you can sell, the minimum price, the platform fee, when your share becomes payable, and who can sell today.
Questions and answers — Short answers about saving, resuming, buying and selling agent sessions.

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.

Browse the marketplace What is an agent session? Getting started How it works Session library How selling works FAQ Community (Discord) Why keep the dead ends

a4sx is a product of crossVault GmbH.

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