Imported from abdullahbeam/nexus-design-abdullah (00-system/skills/slack/slack-master/SKILL.md). Install upstream with npx skills add abdullahbeam/nexus-design-abdullah --skill slack-master. Copyright stays with the author.

Slack Master

This is NOT a user-facing skill. It's a shared resource library referenced by Slack integration skills.

Purpose

Provides shared resources to eliminate duplication across:

slack-connect - Meta-skill for Slack workspace operations
slack-send-message - Send messages to channels/DMs
slack-list-channels - List available channels
slack-search-messages - Search message history
And 29 other operation skills...

Instead of loading this skill, users directly invoke the specific skill they need above.

Architecture: DRY Principle

Problem solved: Slack skills would have duplicated content (setup instructions, API docs, auth flow, error handling).

Solution: Extract shared content into slack-master/references/ and slack-master/scripts/, then reference from each skill.

Result: Single source of truth, reduced context per skill.

Authentication Model: User OAuth

This integration uses User OAuth (not Bot OAuth) for team-wide deployment:

┌─────────────────────────────────────────────────────────────┐
│  USER OAUTH (Per-User Authentication)                       │
├─────────────────────────────────────────────────────────────┤
│  • Each team member authenticates with their own account    │
│  • Messages sent appear as the user (not a bot)             │
│  • Users only see channels/DMs they have access to          │
│  • No cross-user data exposure possible                     │
│  • Token type: xoxp- (user tokens)                          │
└─────────────────────────────────────────────────────────────┘

Why User OAuth?

Messages appear from the actual user, not a bot
Respects existing channel permissions
No need for bot installation in every channel
Each user controls their own access

Shared Resources

All Slack skills reference these resources (progressive disclosure).

references/

setup-guide.md - Complete setup wizard

Creating a Slack App with User OAuth
Configuring OAuth scopes
Getting client ID and secret
Running the OAuth flow

api-reference.md - Slack API patterns

Base URL and authentication
All 32 API endpoints documented
Request/response examples
Rate limiting info

error-handling.md - Troubleshooting

Common errors and solutions
HTTP error codes
Token expiration handling
Scope issues

authentication.md - User OAuth flow

OAuth 2.0 authorization flow
Token exchange process
Token refresh (Slack tokens don't expire normally)
Per-user token storage

scripts/

Authentication & Configuration

check_slack_config.py - Pre-flight validation

python check_slack_config.py [--json]

Argument	Required	Default	Description
`--json`	No	False	Output structured JSON for AI consumption

Exit codes: 0=configured, 1=partial, 2=not configured

When to Use: Run this FIRST before any Slack operation. Use to validate user token is configured, diagnose authentication issues, or check if OAuth setup is needed.

setup_slack.py - Interactive OAuth wizard

python setup_slack.py

No arguments - runs interactively. Guides through OAuth authorization, gets user token, saves to .env.

When to Use: Use when Slack integration needs initial setup, when check_slack_config.py returns exit code 2, or when user needs to re-authenticate.

slack_client.py - Shared API client

from slack_client import get_client
client = get_client()
result = client.post('chat.postMessage', {'channel': 'C123', 'text': 'Hello'})

Provides:

Automatic token loading from .env
Request formatting for Slack API
Error handling and response parsing
Rate limit awareness

When to Use: Import this in all Slack operation scripts for consistent API access.

Message Operations

send_message.py - Send message (chat.postMessage)

python send_message.py --channel CHANNEL --text "Message" [--thread-ts TS] [--json]

update_message.py - Update message (chat.update)

python update_message.py --channel CHANNEL --ts TIMESTAMP --text "New text" [--json]

delete_message.py - Delete message (chat.delete)

python delete_message.py --channel CHANNEL --ts TIMESTAMP [--json]

schedule_message.py - Schedule message (chat.scheduleMessage)

python schedule_message.py --channel CHANNEL --text "Message" --post-at UNIX_TS [--json]

Channel Operations

list_channels.py - List channels (conversations.list)

python list_channels.py [--types public,private] [--limit N] [--json]

channel_info.py - Get channel info (conversations.info)

python channel_info.py --channel CHANNEL [--json]

channel_history.py - Get messages (conversations.history)

python channel_history.py --channel CHANNEL [--limit N] [--oldest TS] [--latest TS] [--json]

create_channel.py - Create channel (conversations.create)

python create_channel.py --name NAME [--is-private] [--json]

User Operations

list_users.py - List workspace users (users.list)

python list_users.py [--limit N] [--json]

user_info.py - Get user info (users.info)

python user_info.py --user USER_ID [--json]

File Operations

upload_file.py - Upload file (files.upload)

python upload_file.py --file PATH --channels C1,C2 [--title TITLE] [--json]

list_files.py - List files (files.list)

python list_files.py [--channel CHANNEL] [--user USER] [--limit N] [--json]

Search Operations

search_messages.py - Search messages (search.messages)

python search_messages.py --query "search terms" [--count N] [--json]

search_files.py - Search files (search.files)

python search_files.py --query "search terms" [--count N] [--json]

Intelligent Error Detection Flow

When a Slack skill fails due to missing configuration, the AI should:

Step 1: Run Config Check with JSON Output

python 00-system/skills/slack/slack-master/scripts/check_slack_config.py --json

Step 2: Parse the `ai_action` Field

The JSON output includes an ai_action field that tells the AI what to do:

ai_action	What to Do
`proceed_with_operation`	Config OK, continue with the original operation
`run_oauth_setup`	Run: `python setup_slack.py` to authorize
`check_scopes`	Token exists but missing required scopes
`token_revoked`	User revoked access, need to re-authorize

Step 3: Help User Fix Issues

If ai_action is run_oauth_setup:

Tell user: "Slack integration needs setup. Let's authorize your account."
Run: python 00-system/skills/slack/slack-master/scripts/setup_slack.py
User will be guided through OAuth flow
Token saved to .env
Re-run config check to verify

JSON Output Structure

{
  "status": "not_configured",
  "exit_code": 2,
  "ai_action": "run_oauth_setup",
  "missing": [
    {"item": "SLACK_USER_TOKEN", "required": true, "location": ".env"}
  ],
  "fix_instructions": [...],
  "setup_wizard": "python 00-system/skills/slack/slack-master/scripts/setup_slack.py"
}

How Skills Reference This

Each skill loads shared resources only when needed (progressive disclosure):

slack-connect uses:

check_slack_config.py (validate before any operation)
All API scripts based on user request
All references as needed

slack-send-message uses:

check_slack_config.py (validate before sending)
send_message.py (core functionality)
error-handling.md (troubleshooting)

Environment Variables

Required in .env:

# Slack User OAuth Token (starts with xoxp-)
SLACK_USER_TOKEN=[REDACTED slack-token]

# Optional: For OAuth setup flow
SLACK_CLIENT_ID=your-client-id
SLACK_CLIENT_SECRET=your-client-secret

Required OAuth Scopes (User Token)

channels:read        # List public channels
channels:write       # Create/manage public channels
channels:history     # Read public channel messages
groups:read          # List private channels
groups:write         # Create/manage private channels
groups:history       # Read private channel messages
im:read              # List DMs
im:write             # Manage DMs
im:history           # Read DM messages
mpim:read            # List group DMs
mpim:write           # Manage group DMs
mpim:history         # Read group DM messages
chat:write           # Send messages
users:read           # List users
users:read.email     # Get user emails
files:read           # List/download files
files:write          # Upload files
reactions:read       # Get reactions
reactions:write      # Add/remove reactions
pins:read            # List pinned items
pins:write           # Pin/unpin items
search:read          # Search messages/files
reminders:read       # List reminders
reminders:write      # Create/delete reminders
team:read            # Get team info

API Base URL

All API requests go to: https://slack.com/api/

Version: 1.0 Created: 2025-12-17 Status: Production Ready

slack-master

About

Slack Master

Purpose

Architecture: DRY Principle

Authentication Model: User OAuth

Shared Resources

references/

scripts/

Authentication & Configuration

Message Operations

Channel Operations

User Operations

File Operations

Search Operations

Intelligent Error Detection Flow

Step 1: Run Config Check with JSON Output

Step 2: Parse the `ai_action` Field

Step 3: Help User Fix Issues

JSON Output Structure

How Skills Reference This

Environment Variables

Required OAuth Scopes (User Token)

API Base URL

Use it

Manifest

Reviews

About

Slack Master

Purpose

Architecture: DRY Principle

Authentication Model: User OAuth

Shared Resources

references/

scripts/

Authentication & Configuration

Message Operations

Channel Operations

User Operations

File Operations

Search Operations

Intelligent Error Detection Flow

Step 1: Run Config Check with JSON Output

Step 2: Parse the ai_action Field

Step 3: Help User Fix Issues

JSON Output Structure

How Skills Reference This

Environment Variables

Required OAuth Scopes (User Token)

API Base URL

Use it

Manifest

Reviews

Step 2: Parse the `ai_action` Field