# Task ID: 77

**Title:** Implement passthrough and paginate Stages

**Status:** done

**Dependencies:** 71 ✓

**Priority:** high

**Description:** Create the built-in passthrough (no-op) and paginate (large response splitting) stages that form the default proxymodel.

**Details:**

Create `src/mcplocal/src/proxymodel/stages/passthrough.ts`:

```typescript
import type { StageHandler } from '../types';

const handler: StageHandler = async (content, ctx) => {
  return { content };
};
export default handler;
```

Create `src/mcplocal/src/proxymodel/stages/paginate.ts`:

```typescript
import type { StageHandler, Section } from '../types';

const handler: StageHandler = async (content, ctx) => {
  const pageSize = (ctx.config.pageSize as number) ?? 8000;
  
  if (content.length <= pageSize) {
    return { content };
  }
  
  const pages: Section[] = [];
  let offset = 0;
  let pageNum = 1;
  
  while (offset < content.length) {
    const pageContent = content.slice(offset, offset + pageSize);
    pages.push({
      id: `page-${pageNum}`,
      title: `Page ${pageNum}`,
      content: pageContent,
    });
    offset += pageSize;
    pageNum++;
  }
  
  return {
    content: `Content split into ${pages.length} pages (${content.length} chars total). Use section parameter to read specific pages.`,
    sections: pages,
  };
};
export default handler;
```

**Test Strategy:**

passthrough: verify content returned unchanged. paginate: verify content under threshold returns unchanged, content over threshold splits correctly, page boundaries are correct, section IDs are sequential.