etylsarin/slack-notifications
src/orchestrator/plugins/slack/SKILL.md
Slack MCP integration for agent-to-human notifications and bi-directional communication. Use when agents need to post progress updates, request approvals, or read user responses via Slack channels and threads.
$ install --global
skillsauthnpx skillsauth add etylsarin/opencastle slack-notificationsInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Apr 17, 2026, 9:24 AM108.4s3 files scanned
SKILL.md
- name:
- slack-notifications
- description:
- Slack MCP integration for agent-to-human notifications and bi-directional communication. Use when agents need to post progress updates, request approvals, or read user responses via Slack channels and threads.
<!-- ⚠️ This file is managed by OpenCastle. Edits will be overwritten on update. Customize in the .opencastle/ directory instead. -->
Slack Notifications
MCP Server
Package: @kazuph/mcp-slack (stdio). Auth: SLACK_MCP_XOXB_TOKEN env var. Enable SLACK_MCP_ADD_MESSAGE_TOOL=true.
See REFERENCE.md for OAuth scopes and token setup.
Agent Notification Patterns
Progress Updates
🔄 TAS-42 — In progress — implementing unit tests
Files: 3 (PriceFilter.tsx, test, index) | ETA: ~5 min
MCP invocation example
Post an approval request:
const res = mcp_slack_conversations_add_message({
channel: 'C012345',
text: '⏳ Approval Required — TAS-42: Run DB migration?',
thread_ts: null
});
if (!res?.ok) throw new Error('Slack post failed: ' + res?.error);
Bi-Directional Communication
Approval requests are dual-channel — post to Slack AND ask in chat. First response wins.
-
Post to Slack:
⏳ Approval Required — TAS-42: Run DB migration Reply: ✅ approved | ❌ rejected | 💬 questions -
Ask in chat with the same question.
-
Chat response wins → post confirmation to Slack thread.
-
Waiting for Slack → poll thread:
// Poll for approval reply (30s interval, 10 min timeout)
const replies = mcp_slack_conversations_replies({ channel: 'C012345', ts: threadTs, limit: 20 });
for (const msg of replies?.messages || []) {
if (/\b(approved|yes|go)\b/i.test(msg.text)) return 'approved';
if (/\b(rejected|no|stop)\b/i.test(msg.text)) return 'rejected';
}
// Retry after 30s; timeout after 10 min
- If session ends before reply — Save to checkpoint with channel, thread ID, question, and timestamp. The next session's
on-session-starthook checks for replies.
Conventions
Project-specific channel mappings: .opencastle/stack/notifications-config.md. Always thread replies; one thread per task; include tracker issue ID.
Rate Limits
Write: 20/min; Read: 50/min. Batch updates; use threads; cache channel/user IDs.
See REFERENCE.md for security guidelines.
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