# AI Search Patterns

## search() vs aiSearch()

| Use                  | Method       | Returns                            |
| -------------------- | ------------ | ---------------------------------- |
| Custom UI, analytics | `search()`   | Raw chunks only (~100-300ms)       |
| Chatbots, Q&A        | `aiSearch()` | AI response + chunks (~500-2000ms) |

## rewrite_query

| Setting | Use When                                  |
| ------- | ----------------------------------------- |
| `true`  | User input (typos, vague queries)         |
| `false` | LLM-generated queries (already optimized) |

## Multitenancy (Folder-Based)

```typescript
const answer = await env.AI.autorag('saas-docs').aiSearch({
  query: 'refund policy',
  model: '@cf/meta/llama-3.3-70b-instruct-fp8-fast',
  filters: {
    column: 'folder',
    operator: 'gte', // "starts with" pattern
    value: `tenants/${tenantId}/`,
  },
})
```

## Streaming

```typescript
const stream = await env.AI.autorag('docs').aiSearch({
  query,
  model: '@cf/meta/llama-3.3-70b-instruct-fp8-fast',
  stream: true,
})
return new Response(stream, { headers: { 'Content-Type': 'text/event-stream' } })
```

## Score Threshold

| Threshold     | Use                               |
| ------------- | --------------------------------- |
| 0.3 (default) | Broad recall, exploratory         |
| 0.5           | Balanced, production default      |
| 0.7           | High precision, critical accuracy |

## System Prompt Template

```typescript
const systemPrompt = `You are a documentation assistant.
- Answer ONLY based on provided context
- If context doesn't contain answer, say "I don't have information"
- Include code examples from context`
```

## Compound Filters

```typescript
// OR: Multiple folders
filters: {
  operator: "or",
  filters: [
    { column: "folder", operator: "gte", value: "docs/api/" },
    { column: "folder", operator: "gte", value: "docs/auth/" }
  ]
}

// AND: Folder + date
filters: {
  operator: "and",
  filters: [
    { column: "folder", operator: "gte", value: "docs/" },
    { column: "timestamp", operator: "gte", value: oneWeekAgoSeconds }
  ]
}
```

## Reranking

Enable for high-stakes use cases (adds ~300ms latency):

```typescript
reranking: { enabled: true, model: "@cf/baai/bge-reranker-base" }
```