Agent skill

Cron

Create and manage scheduled tasks (cron jobs) that send you messages at specified times.

Apache-2.0Auto-check passedProductivity & Automation

Install Cron

skills CLI

$ npx skills add letta-ai/lettabot --skill cron -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install letta-ai/lettabot cron --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/letta-ai/lettabot.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.skills/cron .claude/skills/cron && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "cron" agent skill from https://github.com/letta-ai/lettabot/tree/main/.skills/cron into .claude/skills/cron/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cron", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/letta-ai/lettabot/tree/main/.skills/cron

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add letta-ai/lettabot --skill cron -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install letta-ai/lettabot cron --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/letta-ai/lettabot.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.skills/cron .agents/skills/cron && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "cron" agent skill from https://github.com/letta-ai/lettabot/tree/main/.skills/cron into .agents/skills/cron/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cron", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add letta-ai/lettabot --skill cron -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install letta-ai/lettabot cron --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/letta-ai/lettabot.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.skills/cron .cursor/skills/cron && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "cron" agent skill from https://github.com/letta-ai/lettabot/tree/main/.skills/cron into .cursor/skills/cron/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cron", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/letta-ai/lettabot.git --path .skills/cron

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add letta-ai/lettabot --skill cron -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install letta-ai/lettabot cron --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/letta-ai/lettabot.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.skills/cron .gemini/skills/cron && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "cron" agent skill from https://github.com/letta-ai/lettabot/tree/main/.skills/cron into .gemini/skills/cron/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cron", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install letta-ai/lettabot cron

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add letta-ai/lettabot --skill cron -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/letta-ai/lettabot.git skills-src && mkdir -p .github/skills && cp -r skills-src/.skills/cron .github/skills/cron && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "cron" agent skill from https://github.com/letta-ai/lettabot/tree/main/.skills/cron into .github/skills/cron/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cron", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add letta-ai/lettabot --skill cron -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install letta-ai/lettabot cron --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/letta-ai/lettabot.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.skills/cron .opencode/skills/cron && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "cron" agent skill from https://github.com/letta-ai/lettabot/tree/main/.skills/cron into .opencode/skills/cron/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cron", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: cron
GitHub stars: 327
Token cost: ~814 tokens
SKILL.md length: 282 words
Files: 1
Skills in repo: 7
Repo updated: May 25, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Create and manage scheduled tasks (cron jobs) that send you messages at specified times.

Tasks that involve Scheduled and recurring tasks
SKILL.md covers Quick Reference, Create a Job, Silent Mode vs Delivery Mode and Message Format, plus 3 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Cron is an agent skill from letta-ai/lettabot. Create and manage scheduled tasks (cron jobs) that send you messages at specified times.

Its SKILL.md is about 810 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Productivity & Automation, covering Scheduled and recurring tasks. The repository describes itself as: Archived - has been replaced by Letta Code channels/schedules! The licence is Apache-2.0.

When your agent uses it

Tasks that involve Scheduled and recurring tasks

Example prompts

“/cron”

What it can do on your machine

Read from SKILL.md and the folder at commit 99c3b5d. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Cron loads about 814 tokens when it runs. Until then it costs about 23 tokens; SKILL.md has 282 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~23
When it runs · the whole SKILL.md, loaded when a task matches: ~814

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from letta-ai/lettabot at commit 99c3b5d, republished under its Apache-2.0 licence (© letta-ai). 282 words, ~814 tokens.

Download SKILL.mdSave it as .claude/skills/cron/SKILL.md (or your agent's skills folder).

name: cron
description: Create and manage scheduled tasks (cron jobs) that send you messages at specified times.

Cron Jobs

Schedule tasks that send messages to the agent at specified times. Jobs are scheduled immediately when created.

Quick Reference

bash

lettabot-cron list                    # List all jobs
lettabot-cron create [options]        # Create job
lettabot-cron delete ID               # Delete job
lettabot-cron enable ID               # Enable job
lettabot-cron disable ID              # Disable job

Create a Job

bash

lettabot-cron create \
  --name "Morning Briefing" \
  --schedule "0 8 * * *" \
  --message "Good morning! Review tasks for today." \
  --deliver telegram:123456789

Options:

-n, --name - Job name (required)
-s, --schedule - Cron expression (required)
-m, --message - Prompt sent to the agent when the job fires (required)
-d, --deliver - Auto-deliver the agent's response to a channel (format: channel:chatId). Without this flag, the job runs in silent mode (see below).
--disabled - Create in disabled state

Silent Mode vs Delivery Mode

Cron jobs run in one of two modes:

Silent mode (no --deliver): The agent receives the message and can act on it (e.g., update memory, run tools), but the response is NOT automatically sent to any chat. If the agent wants to send a message, it must explicitly use lettabot-message send.
Delivery mode (--deliver channel:chatId): The agent's response is automatically delivered to the specified channel/chat after execution.

Message Format

When a cron job runs, the agent receives a message like:

[cron:cron-123abc Morning Briefing] Good morning! Review tasks for today.
Current time: 1/27/2026, 8:00:00 AM (America/Los_Angeles)

This tells the agent:

The message came from a cron job (not a user)
The job ID and name
The current time

Cron Schedule Syntax

┌───────── minute (0-59)
│ ┌─────── hour (0-23)  
│ │ ┌───── day of month (1-31)
│ │ │ ┌─── month (1-12)
│ │ │ │ ┌─ day of week (0-6, Sun=0)
* * * * *

Pattern	When
`0 8 * * *`	Daily at 8:00 AM
`0 9 * * 1-5`	Weekdays at 9:00 AM
`0 /2 * *`	Every 2 hours
`30 17 * * 5`	Fridays at 5:30 PM
`0 0 1 * *`	First of month at midnight

Examples

Daily morning check-in (delivered to Telegram):

bash

lettabot-cron create \
  -n "Morning" \
  -s "0 8 * * *" \
  -m "Good morning! What's on today's agenda?" \
  -d telegram:123456789

Weekly review (delivered to Slack):

bash

lettabot-cron create \
  -n "Weekly Review" \
  -s "0 17 * * 5" \
  -m "Friday wrap-up: What did we accomplish?" \
  -d slack:C1234567890

Background task (silent mode - agent acts but no auto-delivery):

bash

lettabot-cron create \
  -n "Email Check" \
  -s "0 */2 * * *" \
  -m "Check for new emails and summarize anything important."

Notes

Jobs schedule immediately when created (no restart needed)
Use lettabot-cron list to see next run times and last run status
Jobs persist in cron-jobs.json
Logs written to cron-log.jsonl
Without --deliver, the agent must use lettabot-message send to communicate results to users

Files

Just SKILL.md in .skills/cron of letta-ai/lettabot.

Open the folder on GitHubat commit 99c3b5d

Compare with similar skills

Cron next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Cron compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Cron this skillletta-ai/lettabot	327	—	~814	Automated safety check: Pass	Apache-2.0	4 mo ago
ScheduleTinyAGI/tinyagi	3.6k	—	~1.4k	Automated safety check: Pass	MIT	6 mo ago
Send User MessageTinyAGI/tinyagi	3.6k	—	~829	Automated safety check: Pass	MIT	6 mo ago
Cron Opsczl9707/build-your-own-openclaw	1.9k	—	~593	Automated safety check: Pass	MIT	3 mo ago
X Bookmarkssharbelxyz/x-bookmarks	289	—	~2k	Automated safety check: Notes	None	7 mo ago
Wp Wpcli And OpsAutomattic/agent-skills	211	2 repos	~988	Automated safety check: Pass	None	8 mo ago

Similar skills

Schedule
TinyAGI/tinyagi
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3.6k GitHub stars~1.4k tokensUpdated 6 mo ago
Productivity & AutomationAuto-check passed
Send User Message
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Send a proactive message to a paired user via their channel (Discord, Telegram, or WhatsApp).
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Productivity & AutomationAuto-check passed
Cron Ops
czl9707/build-your-own-openclaw
Create, list, and delete scheduled cron jobs. An agent skill from czl9707/build-your-own-openclaw.
1.9k GitHub stars~593 tokensUpdated 3 mo ago
Productivity & AutomationAuto-check passed
X Bookmarks
sharbelxyz/x-bookmarks
Fetch, summarize, and manage X/Twitter bookmarks via bird CLI or X API v2.
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Wp Wpcli And Ops
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A skill your agent uses when working with WP-CLI (wp) for WordPress operations: safe search-replace, db export/import, plugin/theme/user/content management, cron, cache flushing, multisite, and…
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Questions about Cron

What does Cron do?

Create and manage scheduled tasks (cron jobs) that send you messages at specified times. Cron is an agent skill from letta-ai/lettabot. Create and manage scheduled tasks (cron jobs) that send you messages at specified times.

When should I use Cron?

Cron fits situations like: tasks that involve Scheduled and recurring tasks.

How do I install Cron in Claude Code?

Run `npx skills add letta-ai/lettabot --skill cron -a claude-code`. Or copy the skill folder (.skills/cron in letta-ai/lettabot) into .claude/skills/cron in your project. Claude Code loads it when a task matches its description.

How do I install Cron in Codex?

Run `npx skills add letta-ai/lettabot --skill cron -a codex`. Or copy the skill folder (.skills/cron in letta-ai/lettabot) into .agents/skills/cron in your project. Codex loads it when a task matches its description.

Can I use Cron in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add letta-ai/lettabot --skill cron -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cron, .gemini/skills/cron, .github/skills/cron and .opencode/skills/cron in your project.

What does Cron need to run?

SKILL.md names no scripts, command-line tools or credentials: Cron is instructions for the agent only.

Does Cron access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Cron safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Cron use?

Cron is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Cron use?

About 814 tokens (SKILL.md is roughly 3.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Cron?

Skills that share tags, products or a category with Cron: Schedule (TinyAGI/tinyagi, 3.6k stars), Send User Message (TinyAGI/tinyagi, 3.6k stars), Cron Ops (czl9707/build-your-own-openclaw, 1.9k stars) and X Bookmarks (sharbelxyz/x-bookmarks, 289 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Cron?

letta-ai (a GitHub organization) maintains it in letta-ai/lettabot, which has 327 GitHub stars. The repository holds 7 skills in this directory. The repository was last updated on May 25, 2026.

Source: letta-ai/lettabot on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Cron

Install Cron

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Cron Jobs

Quick Reference

Create a Job

Silent Mode vs Delivery Mode

Message Format

Cron Schedule Syntax

Examples

Notes

Files

Compare with similar skills

Similar skills

Schedule

Send User Message

Cron Ops

X Bookmarks

Wp Wpcli And Ops

Ohdear

More from letta-ai/lettabot

Linear

Lettabot

Scheduling

Voice Memo

Bluesky

Google

Questions about Cron

Install Cron

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Cron Jobs

Quick Reference

Create a Job

Silent Mode vs Delivery Mode

Message Format

Cron Schedule Syntax

Examples

Notes

Files

Compare with similar skills

Similar skills

More from letta-ai/lettabot

Related

Questions about Cron