Added changelog generator docs

Author: D-K-P

docs/guides/example-projects/claude-changelog-generator.mdx

@@ -0,0 +1,95 @@
+---
+title: "Changelog generator using Claude Agent SDK"
+sidebarTitle: "Claude changelog generator"
+description: "Automatically generate changelogs from your git commit history using the Claude Agent SDK and Trigger.dev."
+---
+
+## Overview
+
+This demo how to build an AI agent using the Claude Agent SDK that explores GitHub commits, investigates unclear changes by fetching diffs on demand, and generates developer-friendly changelogs.
+
+## Tech stack
+
+- **[Next.js](https://nextjs.org)** – Frontend framework using App Router
+- **[Claude Agent SDK](https://docs.anthropic.com/en/docs/agents-and-tools/claude-agent-sdk)** – Anthropic's agent SDK for building AI agents with custom tools
+- **[Trigger.dev](https://trigger.dev)** – workflow orchestration with real-time streaming, observability, and deployment
+- **[Octokit](https://github.com/octokit/octokit.js)** – GitHub API client for fetching commits and diffs
+
+## Demo video
+
+<video
+  controls
+  className="w-full aspect-video"
+  src="https://github.com/user-attachments/assets/ea151c1d-f866-4da4-90e4-96d65008d51a"
+></video>
+
+## GitHub repo
+
+<Card
+  title="View the changelog generator repo"
+  icon="GitHub"
+  href="https://github.com/triggerdotdev/examples/tree/main/changelog-generator"
+>
+  Click here to view the full open source code for this project in our examples repository on
+  GitHub. You can fork it and use it as a starting point for your own project.
+</Card>
+
+## How it works
+
+The agent workflow:
+
+1. **Receive request** – User provides a GitHub repo URL and date range
+2. **List commits** – Agent calls `list_commits` MCP tool to get all commits
+3. **Analyze commits** – Agent categorizes each commit:
+   - Skip trivial commits (typos, formatting)
+   - Include clear features/improvements directly
+   - Investigate unclear commits by fetching their diffs
+4. **Generate changelog** – Agent writes a categorized markdown changelog
+5. **Stream output** – Changelog streams to the frontend in real-time
+
+## Features
+
+- **Two-phase analysis** – Lists all commits first, then selectively fetches diffs only for ambiguous ones
+- **Custom tools** – `list_commits` and `get_commit_diff` called autonomously by Claude
+- **Real-time streaming** – Changelog streams to the frontend as it's generated via Trigger.dev Realtime
+- **Live observability** – Agent phase, turn count, and tool calls broadcast via run metadata
+- **Private repo support** – Optional GitHub token for private repositories
+
+## Relevant code
+
+| File                                                                                                                                                 | Description                            |
+| ---------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------- |
+| [`trigger/generate-changelog.ts`](https://github.com/triggerdotdev/examples/blob/main/changelog-generator/trigger/generate-changelog.ts)             | Main task with custom tools            |
+| [`trigger/changelog-stream.ts`](https://github.com/triggerdotdev/examples/blob/main/changelog-generator/trigger/changelog-stream.ts)                 | Stream definition for real-time output |
+| [`app/api/generate-changelog/route.ts`](https://github.com/triggerdotdev/examples/blob/main/changelog-generator/app/api/generate-changelog/route.ts) | API endpoint that triggers the task    |
+| [`app/response/[runId]/page.tsx`](https://github.com/triggerdotdev/examples/blob/main/changelog-generator/app/response/%5BrunId%5D/page.tsx)         | Streaming display page                 |
+
+## trigger.config.ts
+
+You need to mark the Claude Agent SDK as external in your trigger.config.ts file.
+
+```ts trigger.config.ts
+import { defineConfig } from "@trigger.dev/sdk";
+
+export default defineConfig({
+  project: process.env.TRIGGER_PROJECT_REF!,
+  runtime: "node",
+  logLevel: "log",
+  maxDuration: 300,
+  build: {
+    external: ["@anthropic-ai/claude-agent-sdk"],
+  },
+  machine: "small-2x",
+});
+```
+
+<Note>
+  Adding packages to `external` prevents them from being bundled, which is necessary for the Claude
+  Agent SDK. See the [build configuration docs](/config/config-file#external) for more details.
+</Note>
+
+## Learn more
+
+- [**Building agents with Claude Agent SDK**](/guides/ai-agents/claude-code-trigger) – Comprehensive guide for using Claude Agent SDK with Trigger.dev
+- [**Realtime**](/realtime/overview) – Stream task progress to your frontend
+- [**Scheduled tasks**](/tasks/scheduled) – Automate changelog generation on a schedule