Hash — a POSIX shell that speaks ACP

[tfcace]

Sharing a client that just landed on the clients page: Hash, an open-source POSIX shell (Go, MIT) that acts as an ACP client.

Most ACP clients are editors, IDEs, or chat TUIs. Hash is the shell itself: instead of opening a separate agent UI, you type ?? anywhere on the command line and it opens a turn against your agent.

?? what k8s contexts are available?      # natural-language → command, runs after you approve
kubectl get pods | ?? extract names      # pipe command output into the agent
git log --format=??  oneline with hash   # complete a single flag inline

• Agent-agnostic over ACP — tested with claude-agent-acp and Gemini CLI over stdio.
• Per-tool-call permission prompts — every agent tool invocation prompts allow / deny / always, scoped per project, globally, or per session.
• Turn-by-turn — when the agent replies with a question, Hash opens a conversation prompt so you can answer in the same session.
• Local-first — SQLite history, local error-fix learning, no account, no telemetry.

Docs and setup: runhash.dev. It's early (tested mostly on macOS + Ghostty so far), so feedback on client-side ACP conformance is very welcome: especially anything I'm handling loosely around session lifecycle, cancellation, or config options.