Cuckoo 🐦

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A durable personal calendar for Claude Code. Set a reminder for a future date (optionally a time), and Cuckoo brings it back the next time you start a Claude Code session on or after that date — like a cuckoo clock popping out at the right moment. It's a tickler file for Claude Code.

Reminders live in plain files, so they survive restarts. When nothing is due, Cuckoo costs you essentially zero context tokens.

How it works

• A SessionStart hook runs a tiny command (cuckoo check) at the start of every session. It reads a small index and prints any due reminders — or stays completely silent.
• A /cuckoo:schedule command lets you add, list, complete, and reschedule reminders.
• Reminders are stored in two tiers:
  • 🌍 Global — ~/.claude/cuckoo/ — personal, works in any project.
  • 📂 Project — <your-repo>/.cuckoo/ — tied to a specific repo (git-ignored by default).

Session-triggered, not an alarm clock. Cuckoo can't push to your phone, and it is not a terminal popup. At session start the hook hands any due reminders to Claude, which announces them in its first reply once you send a message — so a brand-new session you just stare at (without typing anything) shows nothing until you say something. A time of day is the earliest surfacing moment, not a real-time alert. (Calendar/push integration is on the roadmap.)

Install

/plugin marketplace add driversti/claude-cuckoo
/plugin install cuckoo@cuckoo

Then restart Claude Code (or run /reload-plugins).

Usage

/cuckoo:schedule add tomorrow "email the tax form"
/cuckoo:schedule add 2026-07-01 09:00 "quarterly review"
/cuckoo:schedule add next friday "call the dentist" --global
/cuckoo:schedule list
/cuckoo:schedule done call-the-dentist
/cuckoo:schedule reschedule quarterly-review "next monday 8am"

• Dates resolve in your local timezone; natural language ("tomorrow", "next friday 9am", "in 3 days") works.
• Default tier is global. Inside a git repo, if you don't pass a flag Cuckoo asks whether to scope the reminder to the repo (project) or keep it global — pass --global/--project to skip the prompt.

When a reminder is due, your next session opens with a note like:

⏰ CUCKOO — scheduled task(s) due
  • [global] call-the-dentist (due 2026-06-20) -> ~/.claude/cuckoo/call-the-dentist.md

Claude reads the task, brings it up, offers to act on it, then asks whether to mark it done or reschedule.

Why near-zero token cost

The SessionStart hook runs in your shell, not in the model. It reads only a tiny index (date · status · slug) and prints nothing unless something is due. The full text of a reminder lives in its own file and is read only on the day it fires. An idle session pays only for the one-line command description.

Data & privacy

• Everything is local files. No network, no telemetry.
• Project reminders live in <repo>/.cuckoo/, which ships with a .gitignore (*) so your personal reminders are never committed.

Development

# Load the plugin locally without installing:
claude --plugin-dir /path/to/claude-cuckoo
# After edits:
/reload-plugins
# Run the test suite (zero dependencies):
bash tests/run.sh

The data layout and CLI:

~/.claude/cuckoo/            # global tier
├── _index.md                #   DUE  STATUS  SLUG   (tiny; the hook reads only this)
└── <slug>.md                #   the reminder body (read only when due)
<repo>/.cuckoo/              # project tier (same layout, + .gitignore '*')

bin/cuckoo  check | list | dir | add | remove | done | reschedule

Roadmap

• Google Calendar two-way sync — real device push notifications.
• In-session precision timer — fire at the exact minute while a session is open.
• Recurring reminders, snooze.

License

MIT © 2026 Yurii Chekhotskyi