Add slack-summarizer extension

extensions/slack-summarizer/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+
+# Raycast specific files
+raycast-env.d.ts
+.raycast-swift-build
+.swiftpm
+compiled_raycast_swift
+
+# misc
+.DS_Store

extensions/slack-summarizer/.prettierrc

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+{
+  "printWidth": 120,
+  "singleQuote": false
+}

extensions/slack-summarizer/CHANGELOG.md

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+# Slack Summaries Changelog
+
+## [Initial Version] - {PR_MERGE_DATE}

extensions/slack-summarizer/README.md

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+# Slack Summarizer – Raycast Extension
+
+Summarize any Slack channel or thread directly from **Raycast** using OpenAI.
+Perfect for catching-up after vacations, keeping stakeholders in the loop, or turning noisy discussions into succinct, bullet-point briefs.
+
+---
+
+## ✨ Features
+
+| Command                     | What it does                                                                                                     |
+| --------------------------- | ---------------------------------------------------------------------------------------------------------------- |
+| **Summarize Slack Channel** | Picks every standalone message and thread in a channel over the last *n* days and generates a concise digest.    |
+| **Summarize Slack Thread**  | Takes a single thread URL (or timestamp) and produces an executive summary, highlighting decisions & next steps. |
+| **Open in HTML** *(Thread)* | Renders the markdown summary in a clean HTML sheet—handy for sharing or copy-pasting elsewhere.                  |
+
+Both commands respect a **custom OpenAI prompt** so you can fine-tune tone, detail level, language, etc.
+
+## ⚙️ Requirements
+
+- A **Slack workspace** where the Raycast Slack App can be installed with the scopes below.
+
+- An **OpenAI API key**.
+
+### Slack OAuth scopes
+
+`channels:read`,
+`channels:history`,
+`groups:read`,
+`groups:history`,
+`im:read`,
+`im:history`,
+`mpim:read`,
+`mpim:history`,
+`users:read`,
+`search:read`
+
+> The extension uses a PKCE OAuth flow; **no server is required**.
+> Tokens are stored in Raycast’s local secure storage.
+
+## Setup
+
+### Raycast Preferences
+   Open Raycast → *Extensions* → *Slack Summarizer* and set:
+
+   | Preference                   | Description                                            |
+   | ---------------------------- | ------------------------------------------------------ |
+   | **OpenAI API Key**           | `sk-...` key from your OpenAI dashboard                |
+   | **Default OpenAI Model**     | E.g. `gpt-4.1`, or `o3`             |
+
+
+### Authorize Slack
+   Launch either command; the first run triggers an OAuth browser window.
+   Select the workspace → grant the requested scopes → done.
+
+## 📝 Custom Prompt Tips
+
+The *Custom Prompt* preference is pre-pended to every request.
+Examples:
+
+* `Provide a short TL;DR at the top, then bullet points.`
+* `Focus only on action items and decisions; omit pleasantries.`
+
+## 🚧 Limitations
+
+* Large channels (> 1,000 messages) may hit Slack rate limits – exponential back-off is built-in, but huge digests can take time.
+* Slack attachments (files, images) are ignored; only text is summarized.
+
+## 📜 License
+
+MIT © 2025 – Contributors.

extensions/slack-summarizer/eslint.config.js

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+const { defineConfig } = require("eslint/config");
+const raycastConfig = require("@raycast/eslint-config");
+
+module.exports = defineConfig([
+  ...raycastConfig,
+]);