Slack automation CLI for AI agents (TypeScript + Bun).

Guiding principle:

• token-efficient output by default (compact JSON, minimal duplication, and empty/null fields pruned) so LLMs can consume results cheaply.
• zero-config auth -- Auth just works if you have Slack Desktop (with fallbacks available). No Python dependency.

• Read: fetch a message, detect threads, list full threads
• Search: messages + files (with filters)
• Artifacts: auto-download snippets/images/files to local paths for agents
• Write: reply in thread, add reactions
• Canvas: fetch Slack canvases as Markdown

curl -fsSL https://raw.githubusercontent.com/stablyai/agent-slack/master/install.sh | sh

This repo ships an agent skill at skills/agent-slack/ compatible with Claude Code, Codex, Cursor, etc

Install via skills.sh (recommended):

npx skills add stablyai/agent-slack

agent-slack
├── auth
│   ├── whoami
│   ├── test
│   ├── import-desktop
│   ├── import-chrome
│   └── parse-curl
├── message
│   ├── get   <target>             # fetch 1 message (+ thread meta )
│   ├── list  <target>             # fetch full thread
│   ├── send  <target> <text>      # send / reply (does the right thing)
│   └── react
│       ├── add    <target> <emoji>
│       └── remove <target> <emoji>
├── user
│   ├── list
│   └── get <user>
├── search
│   ├── all      <query>           # messages + files
│   ├── messages <query>
│   └── files    <query>
└── canvas
    └── get <canvas-url-or-id>     # canvas → markdown

Notes:

• Output is always JSON and aggressively pruned (null/empty fields removed).
• Attached files are auto-downloaded and returned as absolute local paths.

On macOS, authentication happens automatically:

• Default: reads Slack Desktop local data (no need to quit Slack)
• Fallback: if that fails, tries Chrome extraction (if Slack is open in Chrome)

You can also run manual imports:

agent-slack auth whoami
agent-slack auth import-desktop
agent-slack auth import-chrome
agent-slack auth test

Alternatively, set env vars:

export SLACK_TOKEN="xoxc-..."      # browser token
export SLACK_COOKIE_D="xoxd-..."   # cookie d
agent-slack auth test

Or use a standard Slack token (xoxb/xoxp):

export SLACK_TOKEN="xoxb-..."
agent-slack auth test

message get / message list accept either a Slack message URL or a channel reference:

• URL: https://workspace.slack.com/archives/<channel>/p<digits>[?thread_ts=...]
• Channel: #general (or bare general) or a channel ID like C0123...

In practice:

# Get a single message by channel + ts
agent-slack message get "#general" --ts "1770165109.628379"

# List a full thread by channel + thread root ts
agent-slack message list "#general" --thread-ts "1770165109.000001"

If you have multiple workspaces configured and you use a channel name (#channel / channel), you must pass --workspace (or set SLACK_WORKSPACE_URL):

agent-slack message get "#general" --workspace "https://stablygroup.slack.com" --ts "1770165109.628379"

# Single message (+ thread summary if threaded)
agent-slack message get "https://workspace.slack.com/archives/C123/p1700000000000000"

# Full thread for a message
agent-slack message list "https://workspace.slack.com/archives/C123/p1700000000000000"

Optional:

# Include reactions + which users reacted
agent-slack message get "https://workspace.slack.com/archives/C123/p1700000000000000" --include-reactions

message get fetches a single message. If the message is in a thread, it also returns thread metadata (reply count, participants) but not the full thread contents:

{
  "message": { "ts": "...", "text": "...", "user": "U123", ... },
  "thread": { "replyCount": 5, "participants": ["U123", "U456"] }
}

message list fetches all messages in a thread (or channel history if no thread). Use this when you need the full conversation:

{
  "messages": [
    { "ts": "...", "text": "...", "user": "U123", ... },
    { "ts": "...", "text": "...", "user": "U456", ... }
  ]
}

When to use which:

• Use get to check a single message or see if there's a thread worth expanding
• Use list to read an entire thread conversation

message get/list auto-download attached files to an agent-friendly temp directory and return absolute paths in message.files[].path:

• macOS default: ~/.agent-slack/tmp/downloads/

Agents can read those paths directly (e.g. snippets as .txt, images as .png).

# Search both messages and files
agent-slack search all "smoke tests failed" --channel "#alerts" --after 2026-01-01 --before 2026-02-01

# Search messages only
agent-slack search messages "stably ai" --user "@stablyai" --channel general

# Search files only (downloads files and returns local paths)
agent-slack search files "testing" --content-type snippet --limit 10

Tips:

• For reliable results, include --channel ... (channel-scoped search scans history/files and filters locally).
• Use --workspace https://...slack.com when using #channel names across multiple workspaces.

# List users (email requires appropriate Slack scopes; fields are pruned if missing)
agent-slack user list --workspace "https://workspace.slack.com" --limit 200 | jq .

# Get one user by id or handle
agent-slack user get U12345678 --workspace "https://workspace.slack.com" | jq .
agent-slack user get "@alice" --workspace "https://workspace.slack.com" | jq .

agent-slack canvas get "https://workspace.slack.com/docs/T123/F456"
agent-slack canvas get "F456" --workspace "https://workspace.slack.com"

See CONTRIBUTING.md.

Code. Ship. Test.

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