Agent skill

Slack

by CoWork-OS in CoWork-OS/CoWork-OS

A skill your agent uses when you need to control Slack from CoWork-OSS via the slack tool, including reacting to messages or pinning/unpinning items in Slack channels or DMs.

MITAuto-check passedProductivity & Automation

Install Slack

skills CLI
$ npx skills add CoWork-OS/CoWork-OS --skill slack -a claude-code

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

GitHub CLI
$ gh skill install CoWork-OS/CoWork-OS slack --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/CoWork-OS/CoWork-OS.git skills-src && mkdir -p .claude/skills && cp -r skills-src/resources/skills/slack .claude/skills/slack && 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/

Facts

Skill name
slack
GitHub stars
477
Token cost
~457 tokens
SKILL.md length
228 words
Files
1
Skills in repo
46
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when you need to control Slack from CoWork-OSS via the slack tool, including reacting to messages or pinning/unpinning items in Slack channels or DMs.

  • You need to control Slack from CoWork-OSS via the slack tool
  • SKILL.md covers Purpose, Routing, Trigger Examples and Runtime Prompt
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Including reacting to messages

What it does

Slack is an agent skill from CoWork-OS/CoWork-OS. Use when you need to control Slack from CoWork-OSS via the slack tool, including reacting to messages or pinning/unpinning items in Slack channels or DMs.

Its SKILL.md is about 460 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 Messaging and chat bots. It works with Slack. The repository describes itself as: Local-first personal agentic OS and everything app for coding, knowledge work, web design, automations, and artifacts. The licence is MIT.

When your agent uses it

  • You need to control Slack from CoWork-OSS via the slack tool
  • Including reacting to messages
  • Pinning/unpinning items in Slack channels

Example prompts

  • “/slack”

What it can do on your machine

Read from SKILL.md and the folder at commit 0ace02b. 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 loads about 457 tokens when it runs. Until then it costs about 40 tokens; SKILL.md has 228 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~40
When it runs · the whole SKILL.md, loaded when a task matches
~457

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 CoWork-OS/CoWork-OS at commit 0ace02b, republished under its MIT licence (© CoWork-OS). 228 words, ~457 tokens.

Download SKILL.mdSave it as .claude/skills/slack/SKILL.md (or your agent's skills folder).
name
slack
description
Use when you need to control Slack from CoWork-OSS via the slack tool, including reacting to messages or pinning/unpinning items in Slack channels or DMs.
version
1.0.0
metadata.author
CoWork OS Contributors <info@coworkosapp.com>

Slack

Purpose

Use when you need to control Slack from CoWork-OSS via the slack tool, including reacting to messages or pinning/unpinning items in Slack channels or DMs.

Routing

  • Use when: Use when the user asks to use when you need to control Slack from CoWork-OSS via the slack tool, including reacting to messages or pinning/unpinning items in Slack channels or DMs.
  • Do not use when: Do not use when the request is asking for planning documents, high-level strategy, or non-executable discussion; use the relevant planning or design workflow instead.
  • Outputs: Outcome from Slack: task-specific result plus concrete action notes.
  • Success criteria: Returns concrete actions and decisions matching the requested task, with no fabricated tool-side behavior.

Trigger Examples

Positive
  • Use the slack skill for this request.
  • Help me with slack.
  • Use when the user asks to use when you need to control Slack from CoWork-OSS via the slack tool, including reacting to messages or pinning/unpinning items in Slack channels or DMs.
  • Slack: provide an actionable result.
Negative
  • Do not use when the request is asking for planning documents, high-level strategy, or non-executable discussion; use the relevant planning or design workflow instead.
  • Do not use slack for unrelated requests.
  • This request is outside slack scope.
  • This is conceptual discussion only; no tool workflow is needed.

Runtime Prompt

  • Current runtime prompt length: 2221 characters.
  • Runtime prompt is defined directly in ../slack.json.

© CoWork-OS, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in resources/skills/slack of CoWork-OS/CoWork-OS.

Open the folder on GitHubat commit 0ace02b

Compare with similar skills

Slack 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 compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Slack this skillCoWork-OS/CoWork-OS477—~457Automated safety check: PassMIT
Slackhuangruiteng/CS-Notes4k10 repos~578Automated safety check: PassMIT
Slack Messaginghaojing8312/WorkClaw141—~897Automated safety check: PassApache-2.0
Im Adapter0xranx/golembot322—~1.4kAutomated safety check: PassMIT
Message Push0xranx/golembot322—~984Automated safety check: PassMIT
Developer Growth Analysisdavila7/claude-code-templates33k13 repos~3.9kAutomated safety check: PassMIT

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Works with

Questions about Slack

What does Slack do?

A skill your agent uses when you need to control Slack from CoWork-OSS via the slack tool, including reacting to messages or pinning/unpinning items in Slack channels or DMs. Slack is an agent skill from CoWork-OS/CoWork-OS. Use when you need to control Slack from CoWork-OSS via the slack tool, including reacting to messages or pinning/unpinning items in Slack channels or DMs.

When should I use Slack?

Slack fits situations like: you need to control Slack from CoWork-OSS via the slack tool; including reacting to messages; pinning/unpinning items in Slack channels.

How do I install Slack in Claude Code?

Run `npx skills add CoWork-OS/CoWork-OS --skill slack -a claude-code`. Or copy the skill folder (resources/skills/slack in CoWork-OS/CoWork-OS) into .claude/skills/slack in your project. Claude Code loads it when a task matches its description.

How do I install Slack in Codex?

Run `npx skills add CoWork-OS/CoWork-OS --skill slack -a codex`. Or copy the skill folder (resources/skills/slack in CoWork-OS/CoWork-OS) into .agents/skills/slack in your project. Codex loads it when a task matches its description.

Can I use Slack 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 CoWork-OS/CoWork-OS --skill slack -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, .gemini/skills/slack, .github/skills/slack and .opencode/skills/slack in your project.

What does Slack need to run?

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

Does Slack 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 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 use?

Slack 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 use?

About 457 tokens (SKILL.md is roughly 1.8k 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?

Skills that share tags, products or a category with Slack: Slack (huangruiteng/CS-Notes, 4k stars), Slack Messaging (haojing8312/WorkClaw, 141 stars), Im Adapter (0xranx/golembot, 322 stars) and Message Push (0xranx/golembot, 322 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Slack?

CoWork-OS (a GitHub organization) maintains it in CoWork-OS/CoWork-OS, which has 477 GitHub stars. The repository holds 46 skills in this directory. The repository was last updated on October 9, 2026.

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