cron

Scheduled Tasks (Cron)

You have access to scheduled task tools (mcp__cron__cron_register, mcp__cron__cron_list, mcp__cron__cron_remove) for registering recurring automated tasks using standard 5-field cron expressions (minute hour day_of_month month day_of_week).

These three tools are deferred: they are not in your direct tool list. Discover them with SearchExtraTools (e.g. search for cron), then invoke them by their full name with ExecuteExtraTool.

When to Use

• The user asks for a recurring/periodic task: reminders, periodic reports, status checks, polling.
• The user asks to manage existing scheduled tasks (list, remove).
• The user's phrasing implies "every X", "每天/每周/每月", "at 9am daily", etc.

Do NOT register a cron task just because the user mentions a time — only when they explicitly want it to repeat automatically.

Tools

If SearchExtraTools returns no mcp__cron__* tool, the built-in cron instance is disabled for this session (MetaHarness CronMiddleware: false, the {"cron": {"disabled": true}} config entry, or PERI_MCP_BUILTIN=off); tell the user instead of trying to work around it.

Cron Expression Format

Standard 5-field cron expression:

minute hour day_of_month month day_of_week

Examples:

• */5 * * * * — every 5 minutes
• 0 9 * * * — every day at 09:00
• 0 9 * * 1-5 — weekdays at 09:00
• 30 8 1 * * — the 1st of each month at 08:30

Use mcp__cron__cron_list to verify the registered task and its next fire time after registering.

Safety

mcp__cron__cron_register schedules future agent turns that fire without further user confirmation — treat it like delegating execution authority. Before registering: