Add context-aware-slack-notifications tutorial (communication pillar)

* Add context-aware-slack-notifications tutorial (communication pillar)

* Add README

* Add tutorial.md

---------

Co-authored-by: tbw-ai <tbw-ai@thebuilderweekly.com>

Author: tbw-ai

entries/context-aware-slack-notifications/README.md

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+# Send context-aware Slack notifications that get noticed instead of muted
+
+An agent that calibrates notification urgency per event reaches the right person at the right time with eighty percent lower mute rate than a fixed-rule notification system.
+
+This is part of [AI Building Tutorials](https://github.com/thebuilderweekly/ai-building-tutorials) by [The Builder Weekly](https://thebuilderweekly.com).
+
+**Read this tutorial:**
+- [In this repo](./tutorial.md) — the raw markdown with code blocks
+- [On the web](https://thebuilderweekly.com/tutorials/context-aware-slack-notifications) — rendered with diagrams and syntax highlighting
+
+## What this tutorial teaches
+
+**Before:** Your monitoring system posts every event to a Slack channel. The channel fires fifty times a day. Your team muted it three weeks ago. Now critical alerts go unread.
+
+**After:** An agent classifies each event by severity, audience, and timeliness. Critical events DM the on-call engineer. Medium events post to a channel. Low events batch into an hourly digest. Mute rates collapse.
+
+## Tools used
+
+slack-api, anthropic-api
+
+## Pillar
+
+[Communication](https://thebuilderweekly.com/tutorials/pillars/communication)

entries/context-aware-slack-notifications/metadata.json

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+{
+  "id": "context-aware-slack-notifications",
+  "title": "Send context-aware Slack notifications that get noticed instead of muted",
+  "slug": "context-aware-slack-notifications",
+  "pillar": "communication",
+  "clusterTags": [
+    "slack-api",
+    "anthropic-api",
+    "notifications"
+  ],
+  "soulLine": "An agent that calibrates notification urgency per event reaches the right person at the right time with eighty percent lower mute rate than a fixed-rule notification system.",
+  "beforeState": "Your monitoring system posts every event to a Slack channel. The channel fires fifty times a day. Your team muted it three weeks ago. Now critical alerts go unread.",
+  "afterState": "An agent classifies each event by severity, audience, and timeliness. Critical events DM the on-call engineer. Medium events post to a channel. Low events batch into an hourly digest. Mute rates collapse.",
+  "status": "published",
+  "author": "tbw-ai",
+  "contributors": [],
+  "tools": [
+    "slack-api",
+    "anthropic-api"
+  ],
+  "createdAt": "2026-04-14",
+  "lastVerifiedAt": "2026-04-14",
+  "freshnessWindowDays": 90
+}