Agent skill

Slack Message Check

Check Slack for important messages and activity. An agent skill from itseffi/agentic-os.

MITAuto-check passedProductivity & Automation

Install Slack Message Check

skills CLI

$ npx skills add itseffi/agentic-os --skill slack-message-check -a claude-code

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

GitHub CLI

$ gh skill install itseffi/agentic-os slack-message-check --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/itseffi/agentic-os.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/slack-message-check .claude/skills/slack-message-check && 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 "slack-message-check" agent skill from https://github.com/itseffi/agentic-os/tree/main/.agents/skills/slack-message-check into .claude/skills/slack-message-check/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "slack-message-check", 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/itseffi/agentic-os/tree/main/.agents/skills/slack-message-check

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 itseffi/agentic-os --skill slack-message-check -a codex

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

GitHub CLI

$ gh skill install itseffi/agentic-os slack-message-check --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/itseffi/agentic-os.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/slack-message-check .agents/skills/slack-message-check && 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 "slack-message-check" agent skill from https://github.com/itseffi/agentic-os/tree/main/.agents/skills/slack-message-check into .agents/skills/slack-message-check/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "slack-message-check", 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 itseffi/agentic-os --skill slack-message-check -a cursor

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

GitHub CLI

$ gh skill install itseffi/agentic-os slack-message-check --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/itseffi/agentic-os.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/slack-message-check .cursor/skills/slack-message-check && 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 "slack-message-check" agent skill from https://github.com/itseffi/agentic-os/tree/main/.agents/skills/slack-message-check into .cursor/skills/slack-message-check/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "slack-message-check", 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/itseffi/agentic-os.git --path .agents/skills/slack-message-check

--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 itseffi/agentic-os --skill slack-message-check -a gemini-cli

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

GitHub CLI

$ gh skill install itseffi/agentic-os slack-message-check --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/itseffi/agentic-os.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/slack-message-check .gemini/skills/slack-message-check && 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 "slack-message-check" agent skill from https://github.com/itseffi/agentic-os/tree/main/.agents/skills/slack-message-check into .gemini/skills/slack-message-check/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "slack-message-check", 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 itseffi/agentic-os slack-message-check

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 itseffi/agentic-os --skill slack-message-check -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/itseffi/agentic-os.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/slack-message-check .github/skills/slack-message-check && 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 "slack-message-check" agent skill from https://github.com/itseffi/agentic-os/tree/main/.agents/skills/slack-message-check into .github/skills/slack-message-check/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "slack-message-check", 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 itseffi/agentic-os --skill slack-message-check -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 itseffi/agentic-os slack-message-check --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/itseffi/agentic-os.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/slack-message-check .opencode/skills/slack-message-check && 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 "slack-message-check" agent skill from https://github.com/itseffi/agentic-os/tree/main/.agents/skills/slack-message-check into .opencode/skills/slack-message-check/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "slack-message-check", 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: slack-message-check
GitHub stars: 115
Token cost: ~465 tokens
SKILL.md length: 201 words
Files: 2
Skills in repo: 29
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Check Slack for important messages and activity. An agent skill from itseffi/agentic-os.

Works in 5 steps: List Relevant Channels → Check Priority Channels → Summarize Activity → …
Asks about Slack updates
SKILL.md covers Instructions, Example Flow, Notes and When to Use, plus 1 more section
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Slack Message Check is an agent skill from itseffi/agentic-os. Check Slack for important messages and activity. Use during daily planning or when user asks about Slack updates.

Its SKILL.md is about 470 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).

It sits in Productivity & Automation, covering Calendar and scheduling. It works with Slack. The repository describes itself as: Agentic personal OS to automate high-leverage workflows with Codex, Claude Code, Pi, OpenClaw and other coding agents/ runtime platforms. The licence is MIT.

When your agent uses it

Asks about Slack updates
Tasks that involve Calendar and scheduling

Example prompts

“/slack-message-check”

Workflow steps

5 steps, taken from the step headings in SKILL.md.

List Relevant Channels
Check Priority Channels
Summarize Activity
Offer Actions
Continue Daily Flow

What it can do on your machine

Read from SKILL.md and the folder at commit e54d0ac. 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.
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

Slack Message Check loads about 465 tokens when it runs. Until then it costs about 33 tokens; SKILL.md has 201 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~33
When it runs · the whole SKILL.md, loaded when a task matches: ~465

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 itseffi/agentic-os at commit e54d0ac, republished under its MIT licence (© itseffi). 201 words, ~465 tokens.

Download SKILL.mdSave it as .claude/skills/slack-message-check/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.

name: slack-message-check
description: Check Slack for important messages and activity. Use during daily planning or when user asks about Slack updates.

Slack Message Check

Check Slack channels for important messages and summarize activity.

Instructions

Step 1: List Relevant Channels

Call slack_list_channels to see available channels.

Step 2: Check Priority Channels

For each important channel (determined by user preferences or channel activity):

Call slack_get_channel_history with limit of 20 messages
Filter for messages since last check

Step 3: Summarize Activity

Present findings to user:

Slack activity since yesterday:

**#general** (3 new messages)
- @alice mentioned the deployment schedule

**#engineering** (12 new messages)  
- Discussion about API changes
- @bob asked for review on PR #234

**DMs** (2 unread)
- @carol: Question about meeting time

Step 4: Offer Actions

Option	Description
Create task	Turn a message into a task
Reply	Draft a response
Mark read	Continue without action

Step 5: Continue Daily Flow

After Slack check, continue with normal planning workflow.

Example Flow

User: "What should I work on today?"

Agent:

Checks Slack for new activity
"You have 5 new messages across 2 channels..."
Summarizes key items
Offers to create tasks from actionable messages
Continues with task planning

Notes

Focus on actionable messages, not all activity
Prioritize DMs and mentions over general channel noise
Respect user's channel preferences if configured

When to Use

Use this skill when the task directly matches the workflow described above.

When Not to Use

Do not use this skill when the request is unrelated, low-stakes, or better handled by a simpler direct response.

Files

SKILL.md and 1 other file in .agents/skills/slack-message-check of itseffi/agentic-os.

SKILL.md
agents/openai.yaml

Open the folder on GitHubat commit e54d0ac

Compare with similar skills

Slack Message Check 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.

Slack Message Check compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Slack Message Check this skillitseffi/agentic-os	115	—	~465	Automated safety check: Pass	MIT	yesterday
Composio Cloud Toolsquarqlabs/argus	277	—	~543	Automated safety check: Pass	Apache-2.0	4 mo ago
Calendar Automationclaude-office-skills/skills	499	—	~2.7k	Automated safety check: Pass	MIT	8 mo ago
Management Talkthananon/9arm-skills	3.2k	—	~3.2k	Automated safety check: Pass	None	3 mo ago
Slackhuangruiteng/CS-Notes	4k	10 repos	~578	Automated safety check: Pass	MIT	2 days ago
Composioyc-software/qm	15k	—	~1.6k	Automated safety check: Pass	MIT	today

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Questions about Slack Message Check

What does Slack Message Check do?

Check Slack for important messages and activity. An agent skill from itseffi/agentic-os. Slack Message Check is an agent skill from itseffi/agentic-os. Check Slack for important messages and activity.

When should I use Slack Message Check?

Slack Message Check fits situations like: asks about Slack updates; tasks that involve Calendar and scheduling.

How do I install Slack Message Check in Claude Code?

Run `npx skills add itseffi/agentic-os --skill slack-message-check -a claude-code`. Or copy the skill folder (.agents/skills/slack-message-check in itseffi/agentic-os) into .claude/skills/slack-message-check in your project. Claude Code loads it when a task matches its description.

How do I install Slack Message Check in Codex?

Run `npx skills add itseffi/agentic-os --skill slack-message-check -a codex`. Or copy the skill folder (.agents/skills/slack-message-check in itseffi/agentic-os) into .agents/skills/slack-message-check in your project. Codex loads it when a task matches its description.

Can I use Slack Message Check 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 itseffi/agentic-os --skill slack-message-check -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/slack-message-check, .gemini/skills/slack-message-check, .github/skills/slack-message-check and .opencode/skills/slack-message-check in your project.

What does Slack Message Check need to run?

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

Does Slack Message Check 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 Slack Message Check 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 Slack Message Check use?

Slack Message Check is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Slack Message Check use?

About 465 tokens (SKILL.md is roughly 1.9k 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 Slack Message Check?

Skills that share tags, products or a category with Slack Message Check: Composio Cloud Tools (quarqlabs/argus, 277 stars), Calendar Automation (claude-office-skills/skills, 499 stars), Management Talk (thananon/9arm-skills, 3.2k stars) and Slack (huangruiteng/CS-Notes, 4k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Slack Message Check?

itseffi (a GitHub user) maintains it in itseffi/agentic-os, which has 115 GitHub stars. The repository holds 29 skills in this directory. The repository was last updated on October 7, 2026.

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

Install Slack Message Check

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Slack Message Check

Instructions

Step 1: List Relevant Channels

Step 2: Check Priority Channels

Step 3: Summarize Activity

Step 4: Offer Actions

Step 5: Continue Daily Flow

Example Flow

Notes

When to Use

When Not to Use

Files

Compare with similar skills

Similar skills

More from itseffi/agentic-os

Related

Questions about Slack Message Check