$ dibs claim phone-a --note "regression run"
claimed phone-a as alice

$ dibs claim phone-a                      # …from another session
BUSY phone-a: held by alice since 2026-09-02T21:14:03Z (3m ago) — "regression run"

$ dibs release phone-a
released phone-a (was alice)

Why

You have one test phone, one GPU, one hardware bench — and several terminals (or several coding agents) that can all reach it. dibs is the smallest thing that makes them take turns.

• One file, no dependencies. A single Python script, stdlib only. No daemon, no server, no database.
• Cross-platform. macOS, Linux, Windows.
• Legible. The ledger is one human-readable JSON file per resource, and every "busy" says who, since when, and why.
• Agent-friendly. Stable exit codes, --json, a blocking --wait, and a run wrapper that always releases — even when the command fails.

Install

pipx install call-dibs        # or: pip install call-dibs · uv tool install call-dibs

Works the same on macOS, Linux, and Windows. Prefer no package manager? It's one file — dibs.py — drop it on your PATH.

Set up

Tell dibs what you share. Write ~/.dibs/resources.json once, by hand:

{
  "phone-a": "Android test phone on the bench",
  "gpu-0": "the shared training GPU",
  "printer": "label printer, room 2"
}

Only these names can be claimed, so a typo can't silently create a new lock. dibs never edits this file.

Use

Exit codes: 0 ok · 2 busy · 3 not yours · 4 wait timeout · 1 error.

Who's asking

Every claim records an owner, and only that owner can release it. Name yourself once per session with DIBS_OWNER:

export DIBS_OWNER=alice                    # people
DIBS_OWNER=agent:task-123 dibs claim …     # agents: inline, so every call agrees

If it's unset, dibs falls back to user@host:pid — fine for one-off use, wrong for agents whose shell changes every command. --force releases someone else's lock when they're gone.

Groups

Claim several resources in one call and they form a group. The claim is all-or-nothing — if any resource is busy, nothing is taken — and the group gets a tag so you can drop the whole set at once:

$ dibs claim phone-a gpu-0 --note "regression run"
claimed gpu-0 as alice
claimed phone-a as alice
group g-3fa2c1: gpu-0, phone-a (discard with: dibs release g-3fa2c1)

$ dibs release g-3fa2c1

Name the group yourself with --as NAME.

For AI agents

skills/dibs/ is a drop-in skill for Claude Code (and reads fine as an AGENTS.md snippet for anything else). It teaches the protocol: claim before touching hardware, one call per set, release when done, never force-break someone else's lock.

cp -r skills/dibs ~/.claude/skills/

Menu bar (macOS)

See the ledger at a glance: dibs ✋2 in the top bar when two things are claimed, dibs ✓ when everything is free, and who-has-what in the dropdown. Install SwiftBar, then add the plugin:

open "swiftbar://addplugin?src=https://raw.githubusercontent.com/NeoMarcoPolo/call-dibs/main/contrib/dibs.5s.sh"

How it works

One JSON file per resource under ~/.dibs/ (override with DIBS_DIR). A claim is an atomic O_CREAT|O_EXCL create, so racing claimers get exactly one winner. Locks are advisory and are held until released — there is no expiry. The ledger is per-machine by default; point DIBS_DIR at a shared directory to span machines.

Contributing

python3 -m unittest discover tests. Keep it small.

Releases: bump version in pyproject.toml and dibs.py, then push a v* tag — CI publishes to PyPI via trusted publishing (maintainer approval required).

License

MIT