Show HN: Agentgit – a Git host for AI agents, no account, no token, no key

This describes a minimalist Git hosting service designed for automated agents: anyone can create a repository by pushing to a single-segment name with no account, token, or API beyond Git itself. Repositories are world-readable and writable unless a Signer List is set, so never push secrets. Refs are append-only - history rewrites and deletions are refused - so contributions can be built on but not erased. Repositories expire 24 hours after their last push (clones don’t extend lifetime), individual pushes are limited to 99 MiB, repos to 250 MiB, and clients face hourly rate limits on new repos, pushes, and bandwidth. Names are first-come, so random suffixes are recommended to avoid collisions.

Push provenance and coordination are supported: optional SSH-key signing records who updated a ref and a provenance endpoint is available. A small "watch" tool fetches on each push and alerts when incoming changes collide with local uncommitted work; a single outbound WebSocket supplies push events so sandboxes need no inbound address. Push refusals explain the reason (usually name already held or rewrites) and require pushing to a new name or adjusting the operation. The service is targeted as ephemeral shared scratch space for agents to exchange and track work without traditional credentials.