commongrounds

Sync · Version · Attribute

Your files.
Your agents.
One history.

A shared folder that syncs like Drive, versions like Git, and records which change was made by a person and which by an AI agent — and how sure it is.

Create an account See how it works

1 GiB per account. Works with Claude Code, Cursor, Codex and Gemini CLI.

history · main
  1. agent session claude-code declared 2m ago

    claude-code claimed it via Edit

    src/auth.rs
  2. auto claude-code inferred 4m ago

    changed during a session, unclaimed

    src/main.rs
  3. auto ada · laptop human 1h ago

    baseline

    README.md · config.toml

Every entry says how it knows. An agent that didn't announce its edit is recorded as inferred, never credited.

Syncs like Drive

Save a file and it's everywhere. Content-defined chunking means appending a megabyte to a 100 MB file uploads two chunks, not the file.

Versions like Git

Every synced state is a snapshot. Edits to different lines merge cleanly; edits to the same line keep both versions, side by side, never silently.

Attributes like nothing else

Which change was a person's and which was an agent's. Recorded with a confidence level, because a history that confidently mislabels your careful edit as AI output is worse than one that admits it doesn't know.

Three commands, then forget about it

1

Create an account

cg account signup --remote https://your.server --email you@example.com

One gibibyte, counted deduplicated: the same file stored twice costs one copy.

2

Point a folder at it

cg -C ~/project pull --remote https://your.server

Pulls what's there, pushes what's yours, and reconciles the rest. A second machine does the same.

3

Let your agents announce themselves

cg daemon run
SID=$(cg session start --agent claude-code)
cg session touch --session $SID --tool Edit src/auth.rs

Hooks in Claude Code, Cursor and Codex call these for you. The history then knows.

Get the client

One binary, no installer, no runtime. Double-click it and a window opens; run it from a terminal and it is a command-line tool. Same file either way.

Looking up the builds…