Slack Utilities

Slack Utilities

Generic Slack helper utilities for common Slack operations.

Overview

This skill provides deterministic scripts for Slack operations:

• Fetch channel messages - Retrieve message history with time windows
• Fetch thread replies - Retrieve all replies in a thread
• Post messages - Send messages to Slack channels
• Convert timestamps - Convert Slack timestamps to ISO 8601 format

Prerequisites

Required:

• Environment variables:
• SLACK_XOXC_TOKEN - Slack cookie token
• SLACK_XOXD_TOKEN - Slack workspace token
• SLACK_WORKSPACE - Slack workspace name (default: "redhat")
• Python 3.x with requests library (pip3 install -r requirements.txt)

Scripts

Fetch Messages

Script: scripts/slack/fetch_messages.py

Purpose: Fetch Slack channel message history using Slack Web API (conversations.history)

Usage:

./scripts/slack/fetch_messages.py    [--filter-date YYYY-MM-DD]

Parameters:

• channel_id - Slack channel ID (e.g., "C08LVA9E1SS")
• time_window - Time window (e.g., "65m", "90d", "1w")
• output_path - Path to write JSON output
• --filter-date - Optional: filter to messages from this date only (YYYY-MM-DD)

Time Window Format:

• m - minutes (e.g., "65m" = last 65 minutes)
• h - hours (e.g., "2h" = last 2 hours)
• d - days (e.g., "90d" = last 90 days)
• w - weeks (e.g., "1w" = last week)

Example:

./scripts/slack/fetch_messages.py "C08LVA9E1SS" "1h" "/tmp/messages.json"
./scripts/slack/fetch_messages.py "C08LVA9E1SS" "90d" "/tmp/messages.json" --filter-date "2025-12-15"

Output Format:

• Without --filter-date: JSON summary to stdout ({"message_count": N, "output_path": "..."})
• With --filter-date: Filtered messages JSON array to stdout, saved to output file

Exit codes:

• 0 = success
• 1 = invalid params
• 2 = API error
• 4 = auth error

---

Fetch Thread Replies

Script: scripts/slack/fetch_thread_replies.py

Purpose: Fetch thread replies using Slack Web API (conversations.replies)

Usage:

./scripts/slack/fetch_thread_replies.py   

Parameters:

• channel_id - Slack channel ID
• thread_ts - Thread timestamp (e.g., "1769005300.000000")
• output_path - Path to write JSON output

Example:

./scripts/slack/fetch_thread_replies.py "C08LVA9E1SS" "1769005300.000000" "/tmp/thread.json"

Output Format: JSON array of thread messages including the parent message and all replies:

[
  {
    "ts": "1769005300.000000",
    "user": "U12345678",
    "text": "Parent message...",
    "thread_ts": "1769005300.000000"
  },
  {
    "ts": "1769005400.000000",
    "user": "U87654321",
    "text": "Reply message...",
    "thread_ts": "1769005300.000000"
  }
]

Exit codes:

• 0 = success
• 1 = invalid params
• 2 = API error
• 4 = auth error

---

Find Channel

Script: scripts/slack/find_channel.py

Purpose: Find a Slack channel ID by name using Slack Web API (conversations.list)

Usage:

./scripts/slack/find_channel.py 

Parameters:

• channel_name - Channel name to search for (with or without #)

Example:

./scripts/slack/find_channel.py my-team-alerts
./scripts/slack/find_channel.py "#general"

Output Format:

{
  "id": "C04ABCD1234",
  "name": "my-team-alerts",
  "is_private": false,
  "num_members": 12
}

Exit codes:

• 0 = success
• 1 = invalid params / channel not found
• 2 = API error
• 4 = auth error

---

Post Message

Script: scripts/slack/post_message.py

Purpose: Post messages to Slack channels using Slack Web API (chat.postMessage)

Usage:

./scripts/slack/post_message.py  

Parameters:

• channel_id - Slack channel ID
• message_text - Message to post (supports markdown)

Example:

./scripts/slack/post_message.py "C09G0CMTUNA" "Release completed successfully!"

Markdown Support: The message text supports Slack markdown formatting:

• *bold* - Bold text
• _italic_ - Italic text
• ~strikethrough~ - Strikethrough text
• ` code ` - Inline code
• `code block` - Code block
• `` - Hyperlinks

Output Format: JSON response from Slack API:

{
  "ok": true,
  "channel": "C09G0CMTUNA",
  "ts": "1704897000.123456",
  "message": {
    "text": "Release completed successfully!",
    "user": "U12345678",
    "type": "message",
    "ts": "1704897000.123456"
  }
}

Exit codes:

• 0 = success
• 1 = invalid params
• 2 = API error
• 4 = auth error

---

Convert Timestamp

Script: scripts/parsing/convert_timestamp.py

Purpose: Convert Slack timestamps to ISO 8601 format

Usage:

./scripts/parsing/convert_timestamp.py 

Parameters:

• slack_timestamp - Slack timestamp (e.g., "1704897000.123456")

Output: ISO 8601 timestamp with UTC timezone (e.g., "2025-01-10T15:30:00Z")

Example:

ISO_TIME=$(./scripts/parsing/convert_timestamp.py "1704897000.123456")
echo "$ISO_TIME"  # 2025-01-10T15:30:00Z

Slack Timestamp Format: Slack timestamps are Unix timestamps (seconds since epoch) with microseconds:

• Format: SSSSSSSSSS.MMMMMM
• Example: 1704897000.123456
• 1704897000 = Unix timestamp (seconds)
• .123456 = Microseconds (not used in conversion)

Exit codes:

• 0 = success
• 1 = invalid params
• 3 = parsing error

---

Usage Notes

Authentication:

• All scripts that interact with Slack require SLACK_XOXC_TOKEN and SLACK_XOXD_TOKEN
• Tokens can be provided via environment variables or command-line arguments
• Default workspace is "redhat" (can be overridden with SLACK_WORKSPACE)

Error Handling:

• All scripts use consistent exit codes (see each script's documentation)
• Errors are written to stderr
• Success output written to stdout (JSON or plain text)

Output Formats:

• fetchmessages and fetchthread_replies: JSON array of messages
• post_message: JSON response from Slack API
• convert_timestamp: ISO 8601 timestamp string

Integration with Other Skills

These utilities are designed to be imported and used by product-specific skills:

# In a product-specific skill
import sys
sys.path.append('/path/to/slack-utilities/scripts')
from slack.fetch_messages import fetch_messages
from parsing.convert_timestamp import convert_timestamp

Or called as standalone scripts:

# Fetch recent messages
/path/to/slack-utilities/scripts/slack/fetch_messages.py "C08LVA9E1SS" "1h" "/tmp/out.json"

Common Workflows

Example 1: Fetch and Parse Recent Messages

# Fetch messages from last hour
./scripts/slack/fetch_messages.py "C08LVA9E1SS" "1h" "/tmp/messages.json"

# Parse the output
cat /tmp/messages.json | jq '.[].text'

Example 2: Fetch Thread Conversation

# First, find a message with replies
MESSAGES=$(./scripts/slack/fetch_messages.py "C08LVA9E1SS" "1d" "/tmp/messages.json")
THREAD_TS=$(echo "$MESSAGES" | jq -r '.[0].thread_ts')

# Fetch the full thread
./scripts/slack/fetch_thread_replies.py "C08LVA9E1SS" "$THREAD_TS" "/tmp/thread.json"

Example 3: Post Status Update

# Post a simple message
./scripts/slack/post_message.py "C09G0CMTUNA" "Build completed successfully"

# Post a formatted message
./scripts/slack/post_message.py "C09G0CMTUNA" "*Build Status:* Success\n\`\`\`Version: 3.2.3-2025101401\`\`\`"

Example 4: Convert Timestamps for Display

# Fetch messages
./scripts/slack/fetch_messages.py "C08LVA9E1SS" "1h" "/tmp/messages.json"

# Convert timestamps to human-readable format
cat /tmp/messages.json | jq -r '.[].ts' | while read ts; do
    echo "Message at: $(./scripts/parsing/convert_timestamp.py $ts)"
done

Troubleshooting

Authentication errors (exit code 4):

• Check that SLACK_XOXC_TOKEN and SLACK_XOXD_TOKEN are set
• Verify tokens are valid and not expired
• Ensure workspace name matches your Slack workspace

API errors (exit code 2):

• Check network connectivity
• Verify channel IDs are correct (should start with 'C')
• Check Slack API status at https://status.slack.com
• For post_message: Ensure bot has permission to post to the channel

Parsing errors (exit code 3):

• Verify timestamp format is correct (Unix timestamp with microseconds)
• Check that message JSON is valid

No messages returned:

• Verify the channel ID is correct
• Check the time window is appropriate (may be too short)
• Ensure the bot has access to the channel
• For private channels, the bot must be invited

Dependencies

Python packages:

• requests>=2.31.0 - For Slack API calls

Install Python dependencies:

pip3 install -r requirements.txt

Testing

Run the test suite:

cd tests/
pip3 install -r ../requirements-test.txt
pytest -v

Test timestamp conversion (no auth needed):

./scripts/parsing/convert_timestamp.py "1704897000.123456"
# Expected: 2024-01-10T14:30:00Z

Security Considerations

Token Management:

• Never commit Slack tokens to version control
• Use environment variables or secret management systems
• Rotate tokens regularly
• Limit token permissions to only what's needed

Channel Access:

• Ensure the bot only has access to authorized channels
• Review channel permissions before posting
• Be cautious when posting to public channels

Data Handling:

• Slack message data may contain sensitive information
• Don't log or store tokens in plaintext
• Clean up temporary files after use

Version History

v2.0.0 (2025-02-18)

• Replaced slackdump wrappers with direct Slack Web API calls
• Added --filter-date flag on fetch_messages.py
• Added filter_messages_by_date() function
• Added test infrastructure (pytest)
• Removed slackdump dependency

v1.0.0 (2025-02-12)

• Initial release
• Extracted from aipcc-claudio downstream project
• Scripts: fetchmessages, fetchthreadreplies, postmessage, convert_timestamp
• Generic utilities for any Slack-based workflow

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: aipcc-cicd
• Source: aipcc-cicd/claudio-skills
• License: Apache-2.0

Install and usage instructions live in the source repository linked above.