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app-instance/backend/nanobot/skills/cron/SKILL.md

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+---
+name: cron
+description: Schedule reminders and recurring tasks.
+---
+
+# Cron
+
+Use the `cron` tool to schedule reminders or recurring tasks.
+
+## Three Modes
+
+1. **Reminder** - message is sent directly to user
+2. **Task** - message is a task description, agent executes and sends result
+3. **One-time** - runs once at a specific time, then auto-deletes
+
+## Examples
+
+Fixed reminder:
+```
+cron(action="add", mode="reminder", message="Time to take a break!", every_seconds=1200)
+```
+
+Dynamic task (agent executes each time):
+```
+cron(action="add", mode="task", message="Check HKUDS/nanobot GitHub stars and report", every_seconds=600)
+```
+
+One-time scheduled task (compute ISO datetime from current time):
+```
+cron(action="add", mode="reminder", message="Remind me about the meeting", at="<ISO datetime>")
+```
+
+Timezone-aware cron:
+```
+cron(action="add", mode="reminder", message="Morning standup", cron_expr="0 9 * * 1-5", tz="America/Vancouver")
+```
+
+List/remove:
+```
+cron(action="list")
+cron(action="remove", job_id="abc123")
+```
+
+## Time Expressions
+
+| User says | Parameters |
+|-----------|------------|
+| every 20 minutes | every_seconds: 1200 |
+| every hour | every_seconds: 3600 |
+| every day at 8am | cron_expr: "0 8 * * *" |
+| weekdays at 5pm | cron_expr: "0 17 * * 1-5" |
+| 9am Vancouver time daily | cron_expr: "0 9 * * *", tz: "America/Vancouver" |
+| at a specific time | at: ISO datetime string (compute from current time) |
+
+## Timezone
+
+Use `tz` with `cron_expr` to schedule in a specific IANA timezone. Without `tz`, the server's local timezone is used.
+
+## Mode
+
+- `mode="reminder"`: send the message directly to the user when the job fires
+- `mode="task"`: send the message back through the agent so it can perform work and report the result; when created from a chat session, the task reuses that session's context by default
+- If `mode` is omitted, the tool defaults to `reminder`