slack
Send messages, manage channels, reactions, and files in Slack with declarative channel-level permissions
Skill by mrjf
Install
Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.
npx agentmarket install skill/mrjf-slack
Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.
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About
Use cases: productivity
Reviews
Write a reviewNo reviews yet. Installed it? Reviews come from verified installers only. How reviews work
Permissions
What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.
- Tools
- No tools found
- Secrets
- None asked for
- Install scripts
- None found
- Runs as
- Node.js package
Network hosts it talks to 1
codeload.github.com· found in install command
Files it touches
~/.claude/skills/slack
Tools it pre-approves 1
From allowed-tools in SKILL.md: the agent may use these without asking you each time.
Bash(./scripts/*)
What's inside
- Skill name
slack- Description
- Send messages, manage channels, reactions, and files in Slack with declarative channel-level permissions
- License
- MIT
- Allowed tools
- Bash(./scripts/*)
- Instructions
- 48 lines in SKILL.md · view on GitHub
Before installing
- Ships executable scripts
- Pre-approves some shell commands
Files (50)
- BAND.md
- SKILL.md
- settings.json · deploy/
- band-config.schema.json · schemas/
- channel.json · schemas/defs/
- message-result.json · schemas/defs/
- ok.json · schemas/defs/
- reaction-result.json · schemas/defs/
- ts.json · schemas/defs/
- channel-info.json · schemas/input/
- channel-list.json · schemas/input/
- file-upload.json · schemas/input/
- message-list.json · schemas/input/
- message-search.json · schemas/input/
- message-send.json · schemas/input/
- reaction-add.json · schemas/input/
- reaction-remove.json · schemas/input/
- thread-reply.json · schemas/input/
- channel-info.json · schemas/output/
- channel-list.json · schemas/output/
- file-upload.json · schemas/output/
- message-list.json · schemas/output/
- message-search.json · schemas/output/
- message-send.json · schemas/output/
- reaction-add.json · schemas/output/
- reaction-remove.json · schemas/output/
- thread-reply.json · schemas/output/
- slack-perms.sh · scripts/_lib/
- channel-info · scripts/
- channel-list · scripts/
- file-upload · scripts/
- message-list · scripts/
- message-search · scripts/
- message-send · scripts/
- reaction-add · scripts/
- reaction-remove · scripts/
- run.sh · scripts/resources/channel-info/
- run.sh · scripts/resources/channel-list/
- run.sh · scripts/resources/file-upload/
- run.sh · scripts/resources/message-list/
- run.sh · scripts/resources/message-search/
- run.sh · scripts/resources/message-send/
- run.sh · scripts/resources/reaction-add/
- run.sh · scripts/resources/reaction-remove/
- run.sh · scripts/resources/thread-reply/
- thread-reply · scripts/
- slack-helpers.ts · test/
- slack-skill-messages.test.ts · test/
- slack-skill-permissions.test.ts · test/
- slack-skill-structure.test.ts · test/
SKILL.md (first lines)
# Slack Send messages, manage channels, reactions, and files in Slack. All operations respect declarative channel-level and feature-level permissions defined in the `slack` section of `BAND.md`. **IMPORTANT: You MUST use ONLY the scripts provided below for ALL Slack operations. Do NOT use `curl`, the Slack API directly, any Slack CLI, SDK, or any other tool. Every Slack interaction must go through `./scripts/<script-name>`. If a script doesn't exist for what you need, say so — do not work around it.** Run scripts with `./scripts/<script-name>`, e.g. `./scripts/channel-list --limit=5`. Use `--help` on any script to see its parameters. ## Permissions Scripts enforce restrictions from the `slack` config section in `BAND.md` before making any API call. This provides application-level authorization on top of Slack API scopes: - **channels.allow** — If set, ONLY these channels work. Empty means none allowed. - **channels.deny** — Always blocked. Deny takes precedence over allow. - **dm** — Direct messages (default: disabled). - **threads** — Thread replies (default: disabled). - **reactions** — Adding/removing reactions (default: disabled). - **files** — File uploads (default: disabled). - **search** — Message search (default: disabled). ## Available scripts ### Messages - **`message-send`** — Send a message to a channel. Input: `channel`, `text`, `thread_ts` - **`message-list`** — List recent messages in a channel. Input: `channel`, `limit` - **`message-search`** — Search messages. Requires `SLACK_USER_TOKEN`. Input: `query`, `channel`, `limit` ### Channels - **`channel-list`** — List channels. Input: `types`, `limit` - **`channel-info`** — Get channel details. Input: `channel` ### Threads - **`thread-reply`** — Reply to a thread. Input: `channel`, `thread_ts`, `text` ### Reactions - **`reaction-add`** — Add a reaction to a message. Input: `channel`, `timestamp`, `emoji` - **`reaction-remove`** — Remove a reaction from a message. Input: `channel`, `timestamp`, `emoji` ### Files - **`file-upload`** — Upload a file to a channel. Input: `channel`, `filename`, `content`, `title` ## Notes - `message-search` requires a user token (`xoxp-`), not a bot token. Set `SLACK_USER_TOKEN` for search. - Channel references accept `#channel-name` or Slack channel IDs (e.g., `C01234ABCDE`). - Execution target is `local-lima` — scripts run in an isolated Lima VM.
From mrjf/bands, MIT.
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Signals
- Stars
- 8
- Forks
- 0
- Open issues
- 8
- Last commit (this folder)
- May 16, 2026 (5 months ago)
From GitHub (fetched Oct 24, 2026).
Details
- License
- MIT
- Repository
- github.com/mrjf/bands
- First seen
- Oct 24, 2026
- Last checked
- Oct 24, 2026
- Source
- GitHubgithub-graphql
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Cite this page
slack skill. Agent Mart. https://agentmart.dev/skills/mrjf-slack (last updated 2026-10-24)