Merge branch 'main' into litellm_tooling_x

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Alexsander Hamir 2026-01-19 08:37:55 -08:00
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# Claude Code - WebSearch Across All Providers
Enable Claude Code's web search tool to work with any provider (Bedrock, Azure, Vertex, etc.). LiteLLM automatically intercepts web search requests and executes them server-side.
## Proxy Configuration
Add WebSearch interception to your `litellm_config.yaml`:
```yaml
model_list:
- model_name: bedrock-sonnet
litellm_params:
model: bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0
aws_region_name: us-east-1
# Enable WebSearch interception for providers
litellm_settings:
callbacks:
- websearch_interception:
enabled_providers:
- bedrock
- azure
- vertex_ai
search_tool_name: perplexity-search # Optional: specific search tool
# Configure search provider
search_tools:
- search_tool_name: perplexity-search
litellm_params:
search_provider: perplexity
api_key: os.environ/PERPLEXITY_API_KEY
```
## Quick Start
### 1. Configure LiteLLM Proxy
Create `config.yaml`:
```yaml
model_list:
- model_name: bedrock-sonnet
litellm_params:
model: bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0
aws_region_name: us-east-1
litellm_settings:
callbacks:
- websearch_interception:
enabled_providers: [bedrock]
search_tools:
- search_tool_name: perplexity-search
litellm_params:
search_provider: perplexity
api_key: os.environ/PERPLEXITY_API_KEY
```
### 2. Start Proxy
```bash
export PERPLEXITY_API_KEY=your-key
litellm --config config.yaml
```
### 3. Use with Claude Code
```bash
export ANTHROPIC_BASE_URL=http://localhost:4000
export ANTHROPIC_API_KEY=sk-1234
claude
```
Now use web search in Claude Code - it works with any provider!
## How It Works
When Claude Code sends a web search request, LiteLLM:
1. Intercepts the native `web_search` tool
2. Converts it to LiteLLM's standard format
3. Executes the search via Perplexity/Tavily
4. Returns the final answer to Claude Code
```mermaid
sequenceDiagram
participant CC as Claude Code
participant LP as LiteLLM Proxy
participant B as Bedrock/Azure/etc
participant P as Perplexity/Tavily
CC->>LP: Request with web_search tool
Note over LP: Convert native tool<br/>to LiteLLM format
LP->>B: Request with converted tool
B-->>LP: Response: tool_use
Note over LP: Detect web search<br/>tool_use
LP->>P: Execute search
P-->>LP: Search results
LP->>B: Follow-up with results
B-->>LP: Final answer
LP-->>CC: Final answer with search results
```
**Result**: One API call from Claude Code → Complete answer with search results
## Supported Providers
| Provider | Native Web Search | With LiteLLM |
|----------|-------------------|--------------|
| **Anthropic** | ✅ Yes | ✅ Yes |
| **Bedrock** | ❌ No | ✅ Yes |
| **Azure** | ❌ No | ✅ Yes |
| **Vertex AI** | ❌ No | ✅ Yes |
| **Other Providers** | ❌ No | ✅ Yes |
## Search Providers
Configure which search provider to use. LiteLLM supports multiple search providers:
| Provider | Configuration |
|----------|---------------|
| **Perplexity** | `search_provider: perplexity` |
| **Tavily** | `search_provider: tavily` |
See [all supported search providers](../search/index.md) for the complete list.
## Configuration Options
### WebSearch Interception Parameters
| Parameter | Type | Required | Description | Example |
|-----------|------|----------|-------------|---------|
| `enabled_providers` | List[String] | Yes | List of providers to enable web search interception for | `[bedrock, azure, vertex_ai]` |
| `search_tool_name` | String | No | Specific search tool from `search_tools` config. If not set, uses first available search tool. | `perplexity-search` |
### Supported Provider Values
Use these values in `enabled_providers`:
| Provider | Value | Description |
|----------|-------|-------------|
| AWS Bedrock | `bedrock` | Amazon Bedrock Claude models |
| Azure OpenAI | `azure` | Azure-hosted models |
| Google Vertex AI | `vertex_ai` | Google Cloud Vertex AI |
| Any Other | Provider name | Any LiteLLM-supported provider |
### Complete Configuration Example
```yaml
model_list:
- model_name: bedrock-sonnet
litellm_params:
model: bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0
aws_region_name: us-east-1
- model_name: azure-gpt4
litellm_params:
model: azure/gpt-4
api_base: https://my-azure.openai.azure.com
api_key: os.environ/AZURE_API_KEY
litellm_settings:
callbacks:
- websearch_interception:
enabled_providers:
- bedrock # Enable for AWS Bedrock
- azure # Enable for Azure OpenAI
- vertex_ai # Enable for Google Vertex
search_tool_name: perplexity-search # Optional: use specific search tool
# Configure search tools
search_tools:
- search_tool_name: perplexity-search
litellm_params:
search_provider: perplexity
api_key: os.environ/PERPLEXITY_API_KEY
- search_tool_name: tavily-search
litellm_params:
search_provider: tavily
api_key: os.environ/TAVILY_API_KEY
```
**How search tool selection works:**
- If `search_tool_name` is specified → Uses that specific search tool
- If `search_tool_name` is not specified → Uses first search tool in `search_tools` list
- In example above: Without `search_tool_name`, would use `perplexity-search` (first in list)
## Related
- [Claude Code Quickstart](./claude_responses_api.md)
- [Claude Code Cost Tracking](./claude_code_customer_tracking.md)
- [Using Non-Anthropic Models](./claude_non_anthropic_models.md)

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---
title: "v1.81.0 - Claude Code - Web Search with all LiteLLM Providers"
slug: "v1-81-0"
date: 2026-01-18T10:00:00
authors:
- name: Krrish Dholakia
title: CEO, LiteLLM
url: https://www.linkedin.com/in/krish-d/
image_url: https://pbs.twimg.com/profile_images/1298587542745358340/DZv3Oj-h_400x400.jpg
- name: Ishaan Jaff
title: CTO, LiteLLM
url: https://www.linkedin.com/in/reffajnaahsi/
image_url: https://pbs.twimg.com/profile_images/1613813310264340481/lz54oEiB_400x400.jpg
hide_table_of_contents: false
---
import Image from '@theme/IdealImage';
import Tabs from '@theme/Tabs';
import TabItem from '@theme/TabItem';
## Deploy this version
<Tabs>
<TabItem value="docker" label="Docker">
``` showLineNumbers title="docker run litellm"
docker run \
-e STORE_MODEL_IN_DB=True \
-p 4000:4000 \
docker.litellm.ai/berriai/litellm:v1.81.0
```
</TabItem>
<TabItem value="pip" label="Pip">
``` showLineNumbers title="pip install litellm"
pip install litellm==1.81.0
```
</TabItem>
</Tabs>
---
## Key Highlights
- **Claude Code** - Support for using web search across Bedrock, Vertex AI, and all LiteLLM providers
- **Major Change** - [50MB limit on image URL downloads](#major-change---chatcompletions-image-url-download-size-limit) to improve reliability
---
## Major Change - /chat/completions Image URL Download Size Limit
To improve reliability and prevent memory issues, LiteLLM now includes a configurable **50MB limit** on image URL downloads by default. Previously, there was no limit on image downloads, which could occasionally cause memory issues with very large images.
### How It Works
Requests with image URLs exceeding 50MB will receive a helpful error message:
```bash
curl -X POST 'https://your-litellm-proxy.com/chat/completions' \
-H 'Content-Type: application/json' \
-H 'Authorization: Bearer sk-1234' \
-d '{
"model": "gpt-4o",
"messages": [
{
"role": "user",
"content": [
{
"type": "text",
"text": "What is in this image?"
},
{
"type": "image_url",
"image_url": {
"url": "https://example.com/very-large-image.jpg"
}
}
]
}
]
}'
```
**Error Response:**
```json
{
"error": {
"message": "Error: Image size (75.50MB) exceeds maximum allowed size (50.0MB). url=https://example.com/very-large-image.jpg",
"type": "ImageFetchError"
}
}
```
### Configuring the Limit
The default 50MB limit works well for most use cases, but you can easily adjust it if needed:
**Increase the limit (e.g., to 100MB):**
```bash
export MAX_IMAGE_URL_DOWNLOAD_SIZE_MB=100
```
**Disable image URL downloads (for security):**
```bash
export MAX_IMAGE_URL_DOWNLOAD_SIZE_MB=0
```
**Docker Configuration:**
```bash
docker run \
-e MAX_IMAGE_URL_DOWNLOAD_SIZE_MB=100 \
-p 4000:4000 \
docker.litellm.ai/berriai/litellm:v1.81.0
```
**Proxy Config (config.yaml):**
```yaml
general_settings:
master_key: sk-1234
# Set via environment variable
environment_variables:
MAX_IMAGE_URL_DOWNLOAD_SIZE_MB: "100"
```
### Why Add This?
This feature improves reliability by:
- Preventing memory issues from very large images
- Aligning with OpenAI's 50MB payload limit
- Validating image sizes early (when Content-Length header is available)
---
## New Models / Updated Models
#### New Model Support
| Provider | Model | Features |
| -------- | ----- | -------- |
| OpenAI | `gpt-5.2-codex` | Code generation |
| Azure | `azure/gpt-5.2-codex` | Code generation |
| Cerebras | `cerebras/zai-glm-4.7` | Reasoning, function calling |
| Replicate | All chat models | Full support for all Replicate chat models |
#### Features
- **[Anthropic](../../docs/providers/anthropic)**
- Add missing anthropic tool results in response - [PR #18945](https://github.com/BerriAI/litellm/pull/18945)
- Preserve web_fetch_tool_result in multi-turn conversations - [PR #18142](https://github.com/BerriAI/litellm/pull/18142)
- **[Gemini](../../docs/providers/gemini)**
- Add presence_penalty support for Google AI Studio - [PR #18154](https://github.com/BerriAI/litellm/pull/18154)
- Forward extra_headers in generateContent adapter - [PR #18935](https://github.com/BerriAI/litellm/pull/18935)
- Add medium value support for detail param - [PR #19187](https://github.com/BerriAI/litellm/pull/19187)
- **[Vertex AI](../../docs/providers/vertex)**
- Improve passthrough endpoint URL parsing and construction - [PR #17526](https://github.com/BerriAI/litellm/pull/17526)
- Add type object to tool schemas missing type field - [PR #19103](https://github.com/BerriAI/litellm/pull/19103)
- Keep type field in Gemini schema when properties is empty - [PR #18979](https://github.com/BerriAI/litellm/pull/18979)
- **[Bedrock](../../docs/providers/bedrock)**
- Add OpenAI-compatible service_tier parameter translation - [PR #18091](https://github.com/BerriAI/litellm/pull/18091)
- Add user auth in standard logging object for Bedrock passthrough - [PR #19140](https://github.com/BerriAI/litellm/pull/19140)
- Strip throughput tier suffixes from model names - [PR #19147](https://github.com/BerriAI/litellm/pull/19147)
- **[OCI](../../docs/providers/oci)**
- Handle OpenAI-style image_url object in multimodal messages - [PR #18272](https://github.com/BerriAI/litellm/pull/18272)
- **[Ollama](../../docs/providers/ollama)**
- Set finish_reason to tool_calls and remove broken capability check - [PR #18924](https://github.com/BerriAI/litellm/pull/18924)
- **[Watsonx](../../docs/providers/watsonx/index)**
- Allow passing scope ID for Watsonx inferencing - [PR #18959](https://github.com/BerriAI/litellm/pull/18959)
- **[Replicate](../../docs/providers/replicate)**
- Add all chat Replicate models support - [PR #18954](https://github.com/BerriAI/litellm/pull/18954)
- **[OpenRouter](../../docs/providers/openrouter)**
- Add OpenRouter support for image/generation endpoints - [PR #19059](https://github.com/BerriAI/litellm/pull/19059)
- **[Volcengine](../../docs/providers/volcano)**
- Add max_tokens settings for Volcengine models (deepseek-v3-2, glm-4-7, kimi-k2-thinking) - [PR #19076](https://github.com/BerriAI/litellm/pull/19076)
- **Azure Model Router**
- New Model - Azure Model Router on LiteLLM AI Gateway - [PR #19054](https://github.com/BerriAI/litellm/pull/19054)
- **GPT-5 Models**
- Correct context window sizes for GPT-5 model variants - [PR #18928](https://github.com/BerriAI/litellm/pull/18928)
- Correct max_input_tokens for GPT-5 models - [PR #19056](https://github.com/BerriAI/litellm/pull/19056)
- **Text Completion**
- Support token IDs (list of integers) as prompt - [PR #18011](https://github.com/BerriAI/litellm/pull/18011)
### Bug Fixes
- **[Anthropic](../../docs/providers/anthropic)**
- Prevent dropping thinking when any message has thinking_blocks - [PR #18929](https://github.com/BerriAI/litellm/pull/18929)
- Fix anthropic token counter with thinking - [PR #19067](https://github.com/BerriAI/litellm/pull/19067)
- Add better error handling for Anthropic - [PR #18955](https://github.com/BerriAI/litellm/pull/18955)
- Fix Anthropic during call error - [PR #19060](https://github.com/BerriAI/litellm/pull/19060)
- **[Gemini](../../docs/providers/gemini)**
- Fix missing `completion_tokens_details` in Gemini 3 Flash when reasoning_effort is not used - [PR #18898](https://github.com/BerriAI/litellm/pull/18898)
- Fix Gemini Image Generation imageConfig parameters - [PR #18948](https://github.com/BerriAI/litellm/pull/18948)
- **[Vertex AI](../../docs/providers/vertex)**
- Fix Vertex AI 400 Error with CachedContent model mismatch - [PR #19193](https://github.com/BerriAI/litellm/pull/19193)
- Fix Vertex AI doesn't support structured output - [PR #19201](https://github.com/BerriAI/litellm/pull/19201)
- **[Bedrock](../../docs/providers/bedrock)**
- Fix Claude Code (`/messages`) Bedrock Invoke usage and request signing - [PR #19111](https://github.com/BerriAI/litellm/pull/19111)
- Fix model ID encoding for Bedrock passthrough - [PR #18944](https://github.com/BerriAI/litellm/pull/18944)
- Respect max_completion_tokens in thinking feature - [PR #18946](https://github.com/BerriAI/litellm/pull/18946)
- Fix header forwarding in Bedrock passthrough - [PR #19007](https://github.com/BerriAI/litellm/pull/19007)
- Fix Bedrock stability model usage issues - [PR #19199](https://github.com/BerriAI/litellm/pull/19199)
---
## LLM API Endpoints
#### Features
- **[/messages (Claude Code)](../../docs/providers/anthropic)**
- Add support for Tool Search on `/messages` API across Azure, Bedrock, and Anthropic API - [PR #19165](https://github.com/BerriAI/litellm/pull/19165)
- Track end-users with Claude Code (`/messages`) for better analytics and monitoring - [PR #19171](https://github.com/BerriAI/litellm/pull/19171)
- Add web search support using LiteLLM `/search` endpoint with Claude Code (`/messages`) - [PR #19263](https://github.com/BerriAI/litellm/pull/19263), [PR #19294](https://github.com/BerriAI/litellm/pull/19294)
- **[/messages (Claude Code) - Bedrock](../../docs/providers/bedrock)**
- Add support for Prompt Caching with Bedrock Converse on `/messages` - [PR #19123](https://github.com/BerriAI/litellm/pull/19123)
- Ensure budget tokens are passed to Bedrock Converse API correctly on `/messages` - [PR #19107](https://github.com/BerriAI/litellm/pull/19107)
- **[Responses API](../../docs/response_api)**
- Add support for caching for responses API - [PR #19068](https://github.com/BerriAI/litellm/pull/19068)
- Add retry policy support to responses API - [PR #19074](https://github.com/BerriAI/litellm/pull/19074)
- **Realtime API**
- Use non-streaming method for endpoint v1/a2a/message/send - [PR #19025](https://github.com/BerriAI/litellm/pull/19025)
- **Batch API**
- Fix batch deletion and retrieve - [PR #18340](https://github.com/BerriAI/litellm/pull/18340)
#### Bugs
- **General**
- Fix responses content can't be none - [PR #19064](https://github.com/BerriAI/litellm/pull/19064)
- Fix model name from query param in realtime request - [PR #19135](https://github.com/BerriAI/litellm/pull/19135)
- Fix video status/content credential injection for wildcard models - [PR #18854](https://github.com/BerriAI/litellm/pull/18854)
---
## Management Endpoints / UI
#### Features
**Virtual Keys**
- View deleted keys for audit purposes - [PR #18228](https://github.com/BerriAI/litellm/pull/18228), [PR #19268](https://github.com/BerriAI/litellm/pull/19268)
- Add status query parameter for keys list - [PR #19260](https://github.com/BerriAI/litellm/pull/19260)
- Refetch keys after key creation - [PR #18994](https://github.com/BerriAI/litellm/pull/18994)
- Refresh keys list on delete - [PR #19262](https://github.com/BerriAI/litellm/pull/19262)
- Simplify key generate permission error - [PR #18997](https://github.com/BerriAI/litellm/pull/18997)
- Add search to key edit team dropdown - [PR #19119](https://github.com/BerriAI/litellm/pull/19119)
**Teams & Organizations**
- View deleted teams for audit purposes - [PR #18228](https://github.com/BerriAI/litellm/pull/18228), [PR #19268](https://github.com/BerriAI/litellm/pull/19268)
- Add filters to organization table - [PR #18916](https://github.com/BerriAI/litellm/pull/18916)
- Add query parameters to `/organization/list` - [PR #18910](https://github.com/BerriAI/litellm/pull/18910)
- Add status query parameter for teams list - [PR #19260](https://github.com/BerriAI/litellm/pull/19260)
- Show internal users their spend only - [PR #19227](https://github.com/BerriAI/litellm/pull/19227)
- Allow preventing team admins from deleting members from teams - [PR #19128](https://github.com/BerriAI/litellm/pull/19128)
- Refactor team member icon buttons - [PR #19192](https://github.com/BerriAI/litellm/pull/19192)
**Models + Endpoints**
- Display health information in public model hub - [PR #19256](https://github.com/BerriAI/litellm/pull/19256), [PR #19258](https://github.com/BerriAI/litellm/pull/19258)
- Quality of life improvements for Anthropic models - [PR #19058](https://github.com/BerriAI/litellm/pull/19058)
- Create reusable model select component - [PR #19164](https://github.com/BerriAI/litellm/pull/19164)
- Edit settings model dropdown - [PR #19186](https://github.com/BerriAI/litellm/pull/19186)
- Fix model hub client side exception - [PR #19045](https://github.com/BerriAI/litellm/pull/19045)
**Usage & Analytics**
- Allow top virtual keys and models to show more entries - [PR #19050](https://github.com/BerriAI/litellm/pull/19050)
- Fix Y axis on model activity chart - [PR #19055](https://github.com/BerriAI/litellm/pull/19055)
- Add Team ID and Team Name in export report - [PR #19047](https://github.com/BerriAI/litellm/pull/19047)
- Add user metrics for Prometheus - [PR #18785](https://github.com/BerriAI/litellm/pull/18785)
**SSO & Auth**
- Allow setting custom MSFT Base URLs - [PR #18977](https://github.com/BerriAI/litellm/pull/18977)
- Allow overriding env var attribute names - [PR #18998](https://github.com/BerriAI/litellm/pull/18998)
- Fix SCIM GET /Users error and enforce SCIM 2.0 compliance - [PR #17420](https://github.com/BerriAI/litellm/pull/17420)
- Feature flag for SCIM compliance fix - [PR #18878](https://github.com/BerriAI/litellm/pull/18878)
**General UI**
- Add allowClear to dropdown components for better UX - [PR #18778](https://github.com/BerriAI/litellm/pull/18778)
- Add community engagement buttons - [PR #19114](https://github.com/BerriAI/litellm/pull/19114)
- UI Feedback Form - why LiteLLM - [PR #18999](https://github.com/BerriAI/litellm/pull/18999)
- Refactor user and team table filters to reusable component - [PR #19010](https://github.com/BerriAI/litellm/pull/19010)
- Adjusting new badges - [PR #19278](https://github.com/BerriAI/litellm/pull/19278)
#### Bugs
- Container API routes return 401 for non-admin users - routes missing from openai_routes - [PR #19115](https://github.com/BerriAI/litellm/pull/19115)
- Allow routing to regional endpoints for Containers API - [PR #19118](https://github.com/BerriAI/litellm/pull/19118)
- Fix Azure Storage circular reference error - [PR #19120](https://github.com/BerriAI/litellm/pull/19120)
- Fix prompt deletion fails with Prisma FieldNotFoundError - [PR #18966](https://github.com/BerriAI/litellm/pull/18966)
---
## AI Integrations
### Logging
- **[OpenTelemetry](../../docs/proxy/logging#opentelemetry)**
- Update semantic conventions to 1.38 (gen_ai attributes) - [PR #18793](https://github.com/BerriAI/litellm/pull/18793)
- **[LangSmith](../../docs/proxy/logging#langsmith)**
- Hoist thread grouping metadata (session_id, thread) - [PR #18982](https://github.com/BerriAI/litellm/pull/18982)
- **[Langfuse](../../docs/proxy/logging#langfuse)**
- Include Langfuse logger in JSON logging when Langfuse callback is used - [PR #19162](https://github.com/BerriAI/litellm/pull/19162)
- **[Logfire](../../docs/observability/logfire)**
- Add ability to customize Logfire base URL through env var - [PR #19148](https://github.com/BerriAI/litellm/pull/19148)
- **General Logging**
- Enable JSON logging via configuration and add regression test - [PR #19037](https://github.com/BerriAI/litellm/pull/19037)
- Fix header forwarding for embeddings endpoint - [PR #18960](https://github.com/BerriAI/litellm/pull/18960)
- Preserve llm_provider-* headers in error responses - [PR #19020](https://github.com/BerriAI/litellm/pull/19020)
- Fix turn_off_message_logging not redacting request messages in proxy_server_request field - [PR #18897](https://github.com/BerriAI/litellm/pull/18897)
### Guardrails
- **[Grayswan](../../docs/proxy/guardrails/grayswan)**
- Implement fail-open option (default: True) - [PR #18266](https://github.com/BerriAI/litellm/pull/18266)
- **[Pangea](../../docs/proxy/guardrails/pangea)**
- Respect `default_on` during initialization - [PR #18912](https://github.com/BerriAI/litellm/pull/18912)
- **[Panw Prisma AIRS](../../docs/proxy/guardrails/panw_prisma_airs)**
- Add custom violation message support - [PR #19272](https://github.com/BerriAI/litellm/pull/19272)
- **General Guardrails**
- Fix SerializationIterator error and pass tools to guardrail - [PR #18932](https://github.com/BerriAI/litellm/pull/18932)
- Properly handle custom guardrails parameters - [PR #18978](https://github.com/BerriAI/litellm/pull/18978)
- Use clean error messages for blocked requests - [PR #19023](https://github.com/BerriAI/litellm/pull/19023)
- Guardrail moderation support with responses API - [PR #18957](https://github.com/BerriAI/litellm/pull/18957)
- Fix model-level guardrails not taking effect - [PR #18895](https://github.com/BerriAI/litellm/pull/18895)
---
## Spend Tracking, Budgets and Rate Limiting
- **Cost Calculation Fixes**
- Include IMAGE token count in cost calculation for Gemini models - [PR #18876](https://github.com/BerriAI/litellm/pull/18876)
- Fix negative text_tokens when using cache with images - [PR #18768](https://github.com/BerriAI/litellm/pull/18768)
- Fix image tokens spend logging for `/images/generations` - [PR #19009](https://github.com/BerriAI/litellm/pull/19009)
- Fix incorrect `prompt_tokens_details` in Gemini Image Generation - [PR #19070](https://github.com/BerriAI/litellm/pull/19070)
- Fix case-insensitive model cost map lookup - [PR #18208](https://github.com/BerriAI/litellm/pull/18208)
- **Pricing Updates**
- Correct pricing for `openrouter/openai/gpt-oss-20b` - [PR #18899](https://github.com/BerriAI/litellm/pull/18899)
- Add pricing for `azure_ai/claude-opus-4-5` - [PR #19003](https://github.com/BerriAI/litellm/pull/19003)
- Update Novita models prices - [PR #19005](https://github.com/BerriAI/litellm/pull/19005)
- Fix Azure Grok prices - [PR #19102](https://github.com/BerriAI/litellm/pull/19102)
- Fix GCP GLM-4.7 pricing - [PR #19172](https://github.com/BerriAI/litellm/pull/19172)
- Sync DeepSeek chat/reasoner to V3.2 pricing - [PR #18884](https://github.com/BerriAI/litellm/pull/18884)
- Correct cache_read pricing for gemini-2.5-pro models - [PR #18157](https://github.com/BerriAI/litellm/pull/18157)
- **Budget & Rate Limiting**
- Correct budget limit validation operator (>=) for team members - [PR #19207](https://github.com/BerriAI/litellm/pull/19207)
- Fix TPM 25% limiting by ensuring priority queue logic - [PR #19092](https://github.com/BerriAI/litellm/pull/19092)
- Cleanup spend logs cron verification, fix, and docs - [PR #19085](https://github.com/BerriAI/litellm/pull/19085)
---
## MCP Gateway
- Prevent duplicate MCP reload scheduler registration - [PR #18934](https://github.com/BerriAI/litellm/pull/18934)
- Forward MCP extra headers case-insensitively - [PR #18940](https://github.com/BerriAI/litellm/pull/18940)
- Fix MCP REST auth checks - [PR #19051](https://github.com/BerriAI/litellm/pull/19051)
- Fix generating two telemetry events in responses - [PR #18938](https://github.com/BerriAI/litellm/pull/18938)
- Fix MCP chat completions - [PR #19129](https://github.com/BerriAI/litellm/pull/19129)
---
## Performance / Loadbalancing / Reliability improvements
- **Performance Improvements**
- Remove bottleneck causing high CPU usage & overhead under heavy load - [PR #19049](https://github.com/BerriAI/litellm/pull/19049)
- Add CI enforcement for O(1) operations in `_get_model_cost_key` to prevent performance regressions - [PR #19052](https://github.com/BerriAI/litellm/pull/19052)
- Fix Azure embeddings JSON parsing to prevent connection leaks and ensure proper router cooldown - [PR #19167](https://github.com/BerriAI/litellm/pull/19167)
- Do not fallback to token counter if `disable_token_counter` is enabled - [PR #19041](https://github.com/BerriAI/litellm/pull/19041)
- **Reliability**
- Add fallback endpoints support - [PR #19185](https://github.com/BerriAI/litellm/pull/19185)
- Fix stream_timeout parameter functionality - [PR #19191](https://github.com/BerriAI/litellm/pull/19191)
- Fix model matching priority in configuration - [PR #19012](https://github.com/BerriAI/litellm/pull/19012)
- Fix num_retries in litellm_params as per config - [PR #18975](https://github.com/BerriAI/litellm/pull/18975)
- Handle exceptions without response parameter - [PR #18919](https://github.com/BerriAI/litellm/pull/18919)
- **Infrastructure**
- Add Custom CA certificates to boto3 clients - [PR #18942](https://github.com/BerriAI/litellm/pull/18942)
- Update boto3 to 1.40.15 and aioboto3 to 15.5.0 - [PR #19090](https://github.com/BerriAI/litellm/pull/19090)
- Make keepalive_timeout parameter work for Gunicorn - [PR #19087](https://github.com/BerriAI/litellm/pull/19087)
- **Helm Chart**
- Fix mount config.yaml as single file in Helm chart - [PR #19146](https://github.com/BerriAI/litellm/pull/19146)
- Sync Helm chart versioning with production standards and Docker versions - [PR #18868](https://github.com/BerriAI/litellm/pull/18868)
---
## Database Changes
### Schema Updates
| Table | Change Type | Description | PR |
| ----- | ----------- | ----------- | -- |
| `LiteLLM_ProxyModelTable` | New Columns | Added `created_at` and `updated_at` timestamp fields | [PR #18937](https://github.com/BerriAI/litellm/pull/18937) |
---
## Documentation Updates
- Add LiteLLM architecture md doc - [PR #19057](https://github.com/BerriAI/litellm/pull/19057), [PR #19252](https://github.com/BerriAI/litellm/pull/19252)
- Add troubleshooting guide - [PR #19096](https://github.com/BerriAI/litellm/pull/19096), [PR #19097](https://github.com/BerriAI/litellm/pull/19097), [PR #19099](https://github.com/BerriAI/litellm/pull/19099)
- Add structured issue reporting guides for CPU and memory issues - [PR #19117](https://github.com/BerriAI/litellm/pull/19117)
- Add Redis requirement warning for high-traffic deployments - [PR #18892](https://github.com/BerriAI/litellm/pull/18892)
- Update load balancing and routing with enable_pre_call_checks - [PR #18888](https://github.com/BerriAI/litellm/pull/18888)
- Updated pass_through with guided param - [PR #18886](https://github.com/BerriAI/litellm/pull/18886)
- Update message content types link and add content types table - [PR #18209](https://github.com/BerriAI/litellm/pull/18209)
- Add Redis initialization with kwargs - [PR #19183](https://github.com/BerriAI/litellm/pull/19183)
- Improve documentation for routing LLM calls via SAP Gen AI Hub - [PR #19166](https://github.com/BerriAI/litellm/pull/19166)
- Deleted Keys and Teams docs - [PR #19291](https://github.com/BerriAI/litellm/pull/19291)
- Claude Code end user tracking guide - [PR #19176](https://github.com/BerriAI/litellm/pull/19176)
- Add MCP troubleshooting guide - [PR #19122](https://github.com/BerriAI/litellm/pull/19122)
- Add auth message UI documentation - [PR #19063](https://github.com/BerriAI/litellm/pull/19063)
- Add guide for mounting custom callbacks in Helm/K8s - [PR #19136](https://github.com/BerriAI/litellm/pull/19136)
---
## Bug Fixes
- Fix Swagger UI path execute error with server_root_path in OpenAPI schema - [PR #18947](https://github.com/BerriAI/litellm/pull/18947)
- Normalize OpenAI SDK BaseModel choices/messages to avoid Pydantic serializer warnings - [PR #18972](https://github.com/BerriAI/litellm/pull/18972)
- Add contextual gap checks and word-form digits - [PR #18301](https://github.com/BerriAI/litellm/pull/18301)
- Clean up orphaned files from repository root - [PR #19150](https://github.com/BerriAI/litellm/pull/19150)
- Include proxy/prisma_migration.py in non-root - [PR #18971](https://github.com/BerriAI/litellm/pull/18971)
- Update prisma_migration.py - [PR #19083](https://github.com/BerriAI/litellm/pull/19083)
---
## New Contributors
* @yogeshwaran10 made their first contribution in [PR #18898](https://github.com/BerriAI/litellm/pull/18898)
* @theonlypal made their first contribution in [PR #18937](https://github.com/BerriAI/litellm/pull/18937)
* @jonmagic made their first contribution in [PR #18935](https://github.com/BerriAI/litellm/pull/18935)
* @houdataali made their first contribution in [PR #19025](https://github.com/BerriAI/litellm/pull/19025)
* @hummat made their first contribution in [PR #18972](https://github.com/BerriAI/litellm/pull/18972)
* @berkeyalciin made their first contribution in [PR #18966](https://github.com/BerriAI/litellm/pull/18966)
* @MateuszOssGit made their first contribution in [PR #18959](https://github.com/BerriAI/litellm/pull/18959)
* @xfan001 made their first contribution in [PR #18947](https://github.com/BerriAI/litellm/pull/18947)
* @nulone made their first contribution in [PR #18884](https://github.com/BerriAI/litellm/pull/18884)
* @debnil-mercor made their first contribution in [PR #18919](https://github.com/BerriAI/litellm/pull/18919)
* @hakhundov made their first contribution in [PR #17420](https://github.com/BerriAI/litellm/pull/17420)
* @rohanwinsor made their first contribution in [PR #19078](https://github.com/BerriAI/litellm/pull/19078)
* @pgolm made their first contribution in [PR #19020](https://github.com/BerriAI/litellm/pull/19020)
* @vikigenius made their first contribution in [PR #19148](https://github.com/BerriAI/litellm/pull/19148)
* @burnerburnerburnerman made their first contribution in [PR #19090](https://github.com/BerriAI/litellm/pull/19090)
* @yfge made their first contribution in [PR #19076](https://github.com/BerriAI/litellm/pull/19076)
* @danielnyari-seon made their first contribution in [PR #19083](https://github.com/BerriAI/litellm/pull/19083)
* @guilherme-segantini made their first contribution in [PR #19166](https://github.com/BerriAI/litellm/pull/19166)
* @jgreek made their first contribution in [PR #19147](https://github.com/BerriAI/litellm/pull/19147)
* @anand-kamble made their first contribution in [PR #19193](https://github.com/BerriAI/litellm/pull/19193)
* @neubig made their first contribution in [PR #19162](https://github.com/BerriAI/litellm/pull/19162)
---
## Full Changelog
**[View complete changelog on GitHub](https://github.com/BerriAI/litellm/compare/v1.80.15.rc.1...v1.81.0.rc.1)**

View file

@ -122,6 +122,7 @@ const sidebars = {
items: [
"tutorials/claude_responses_api",
"tutorials/claude_code_customer_tracking",
"tutorials/claude_code_websearch",
"tutorials/claude_mcp",
"tutorials/claude_non_anthropic_models",
]

View file

@ -329,6 +329,11 @@ ANTHROPIC_WEB_SEARCH_TOOL_MAX_USES = {
"medium": 5,
"high": 10,
}
# LiteLLM standard web search tool name
# Used for web search interception across providers
LITELLM_WEB_SEARCH_TOOL_NAME = "litellm_web_search"
DEFAULT_IMAGE_ENDPOINT_MODEL = "dall-e-2"
DEFAULT_VIDEO_ENDPOINT_MODEL = "sora-2"

View file

@ -143,6 +143,34 @@ class CustomLogger: # https://docs.litellm.ai/docs/observability/custom_callbac
async def async_log_pre_api_call(self, model, messages, kwargs):
pass
async def async_pre_request_hook(
self, model: str, messages: List, kwargs: Dict
) -> Optional[Dict]:
"""
Hook called before making the API request to allow modifying request parameters.
This is specifically designed for modifying the request before it's sent to the provider.
Unlike async_log_pre_api_call (which is for logging), this hook is meant for transformations.
Args:
model: The model name
messages: The messages list
kwargs: The request parameters (tools, stream, temperature, etc.)
Returns:
Optional[Dict]: Modified kwargs to use for the request, or None if no modifications
Example:
```python
async def async_pre_request_hook(self, model, messages, kwargs):
# Convert native tools to standard format
if kwargs.get("tools"):
kwargs["tools"] = convert_tools(kwargs["tools"])
return kwargs
```
"""
pass
async def async_log_success_event(self, kwargs, response_obj, start_time, end_time):
pass

View file

@ -21,7 +21,12 @@ from typing import (
import litellm
from litellm._logging import print_verbose, verbose_logger
from litellm.integrations.custom_logger import CustomLogger
from litellm.proxy._types import LiteLLM_TeamTable, LiteLLM_UserTable, UserAPIKeyAuth
from litellm.proxy._types import (
LiteLLM_DeletedVerificationToken,
LiteLLM_TeamTable,
LiteLLM_UserTable,
UserAPIKeyAuth,
)
from litellm.types.integrations.prometheus import *
from litellm.types.integrations.prometheus import _sanitize_prometheus_label_name
from litellm.types.utils import StandardLoggingPayload
@ -2153,7 +2158,7 @@ class PrometheusLogger(CustomLogger):
self,
data_fetch_function: Callable[..., Awaitable[Tuple[List[Any], Optional[int]]]],
set_metrics_function: Callable[[List[Any]], Awaitable[None]],
data_type: Literal["teams", "keys"],
data_type: Literal["teams", "keys", "users"],
):
"""
Generic method to initialize budget metrics for teams or API keys.
@ -2245,7 +2250,7 @@ class PrometheusLogger(CustomLogger):
async def fetch_keys(
page_size: int, page: int
) -> Tuple[List[Union[str, UserAPIKeyAuth]], Optional[int]]:
) -> Tuple[List[Union[str, UserAPIKeyAuth, LiteLLM_DeletedVerificationToken]], Optional[int]]:
key_list_response = await _list_key_helper(
prisma_client=prisma_client,
page=page,

View file

@ -7,6 +7,98 @@ Server-side WebSearch tool execution for models that don't natively support it (
User makes **ONE** `litellm.messages.acreate()` call → Gets final answer with search results.
The agentic loop happens transparently on the server.
## LiteLLM Standard Web Search Tool
LiteLLM defines a standard web search tool format (`litellm_web_search`) that all native provider tools are converted to. This enables consistent interception across providers.
**Standard Tool Definition** (defined in `tools.py`):
```python
{
"name": "litellm_web_search",
"description": "Search the web for information...",
"input_schema": {
"type": "object",
"properties": {
"query": {"type": "string", "description": "The search query"}
},
"required": ["query"]
}
}
```
**Tool Name Constant**: `LITELLM_WEB_SEARCH_TOOL_NAME = "litellm_web_search"` (defined in `litellm/constants.py`)
### Supported Tool Formats
The interception system automatically detects and handles:
| Tool Format | Example | Provider | Detection Method | Future-Proof |
|-------------|---------|----------|------------------|-------------|
| **LiteLLM Standard** | `name="litellm_web_search"` | Any | Direct name match | N/A |
| **Anthropic Native** | `type="web_search_20250305"` | Bedrock, Claude API | Type prefix: `startswith("web_search_")` | ✅ Yes (web_search_2026, etc.) |
| **Claude Code CLI** | `name="web_search"`, `type="web_search_20250305"` | Claude Code | Name + type check | ✅ Yes (version-agnostic) |
| **Legacy** | `name="WebSearch"` | Custom | Name match | N/A (backwards compat) |
**Future Compatibility**: The `startswith("web_search_")` check in `tools.py` automatically supports future Anthropic web search versions.
### Claude Code CLI Integration
Claude Code (Anthropic's official CLI) sends web search requests using Anthropic's native tool format:
```python
{
"type": "web_search_20250305",
"name": "web_search",
"max_uses": 8
}
```
**What Happens:**
1. Claude Code sends native `web_search_20250305` tool to LiteLLM proxy
2. LiteLLM intercepts and converts to `litellm_web_search` standard format
3. Bedrock receives converted tool (NOT native format)
4. Model returns `tool_use` block for `litellm_web_search` (not `server_tool_use`)
5. LiteLLM's agentic loop intercepts the `tool_use`
6. Executes `litellm.asearch()` using configured provider (Perplexity, Tavily, etc.)
7. Returns final answer to Claude Code user
**Without Interception**: Bedrock would receive native tool → try to execute natively → return `web_search_tool_result_error` with `invalid_tool_input`
**With Interception**: LiteLLM converts → Bedrock returns tool_use → LiteLLM executes search → Returns final answer ✅
### Native Tool Conversion
Native tools are converted to LiteLLM standard format **before** sending to the provider:
1. **Conversion Point** (`litellm/llms/anthropic/experimental_pass_through/messages/handler.py`):
- In `anthropic_messages()` function (lines 60-127)
- Runs BEFORE the API request is made
- Detects native web search tools using `is_web_search_tool()`
- Converts to `litellm_web_search` format using `get_litellm_web_search_tool()`
- Prevents provider from executing search natively (avoids `web_search_tool_result_error`)
2. **Response Detection** (`transformation.py`):
- Detects `tool_use` blocks with any web search tool name
- Handles: `litellm_web_search`, `WebSearch`, `web_search`
- Extracts search queries for execution
**Example Conversion**:
```python
# Input (Claude Code's native tool)
{
"type": "web_search_20250305",
"name": "web_search",
"max_uses": 8
}
# Output (LiteLLM standard)
{
"name": "litellm_web_search",
"description": "Search the web for information...",
"input_schema": {...}
}
```
---
## Request Flow
@ -63,6 +155,9 @@ sequenceDiagram
| Component | File | Purpose |
|-----------|------|---------|
| **WebSearchInterceptionLogger** | `handler.py` | CustomLogger that implements agentic loop hooks |
| **Tool Standardization** | `tools.py` | Standard tool definition, detection, and utilities |
| **Tool Name Constant** | `constants.py` | `LITELLM_WEB_SEARCH_TOOL_NAME = "litellm_web_search"` |
| **Tool Conversion** | `anthropic/.../ handler.py` | Converts native tools to LiteLLM standard before API call |
| **Transformation Logic** | `transformation.py` | Detect tool_use, build tool_result messages, format search responses |
| **Agentic Loop Hooks** | `integrations/custom_logger.py` | Base hooks: `async_should_run_agentic_loop()`, `async_run_agentic_loop()` |
| **Hook Orchestration** | `llms/custom_httpx/llm_http_handler.py` | `_call_agentic_completion_hooks()` - calls hooks after response |
@ -74,7 +169,10 @@ sequenceDiagram
## Configuration
```python
from litellm.integrations.websearch_interception import WebSearchInterceptionLogger
from litellm.integrations.websearch_interception import (
WebSearchInterceptionLogger,
get_litellm_web_search_tool,
)
from litellm.types.utils import LlmProviders
# Enable for Bedrock with specific search tool
@ -85,13 +183,25 @@ litellm.callbacks = [
)
]
# Make request (streaming or non-streaming both work)
# Make request with LiteLLM standard tool (recommended)
response = await litellm.messages.acreate(
model="bedrock/us.anthropic.claude-3-5-sonnet-20241022-v2:0",
model="bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0",
messages=[{"role": "user", "content": "What is LiteLLM?"}],
tools=[{"name": "WebSearch", ...}],
tools=[get_litellm_web_search_tool()], # LiteLLM standard
max_tokens=1024,
stream=True # Auto-converted to non-streaming
)
# OR send native tools - they're auto-converted to LiteLLM standard
response = await litellm.messages.acreate(
model="bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0",
messages=[{"role": "user", "content": "What is LiteLLM?"}],
tools=[{
"type": "web_search_20250305", # Native Anthropic format
"name": "web_search",
"max_uses": 8
}],
max_tokens=1024,
stream=True # Streaming is automatically converted to non-streaming for WebSearch
)
```

View file

@ -8,5 +8,13 @@ support server-side tool calling (e.g., Bedrock/Claude).
from litellm.integrations.websearch_interception.handler import (
WebSearchInterceptionLogger,
)
from litellm.integrations.websearch_interception.tools import (
get_litellm_web_search_tool,
is_web_search_tool,
)
__all__ = ["WebSearchInterceptionLogger"]
__all__ = [
"WebSearchInterceptionLogger",
"get_litellm_web_search_tool",
"is_web_search_tool",
]

View file

@ -12,7 +12,12 @@ from typing import Any, Dict, List, Optional, Tuple, Union, cast
import litellm
from litellm._logging import verbose_logger
from litellm.anthropic_interface import messages as anthropic_messages
from litellm.constants import LITELLM_WEB_SEARCH_TOOL_NAME
from litellm.integrations.custom_logger import CustomLogger
from litellm.integrations.websearch_interception.tools import (
get_litellm_web_search_tool,
is_web_search_tool,
)
from litellm.integrations.websearch_interception.transformation import (
WebSearchTransformation,
)
@ -57,6 +62,55 @@ class WebSearchInterceptionLogger(CustomLogger):
for p in enabled_providers
]
self.search_tool_name = search_tool_name
self._request_has_websearch = False # Track if current request has web search
async def async_pre_call_deployment_hook(
self, kwargs: Dict[str, Any], call_type: Optional[Any]
) -> Optional[dict]:
"""
Pre-call hook to convert native Anthropic web_search tools to regular tools.
This prevents Bedrock from trying to execute web search server-side (which fails).
Instead, we convert it to a regular tool so the model returns tool_use blocks
that we can intercept and execute ourselves.
"""
# Check if this is for an enabled provider
custom_llm_provider = kwargs.get("litellm_params", {}).get("custom_llm_provider", "")
if custom_llm_provider not in self.enabled_providers:
return None
# Check if request has tools with native web_search
tools = kwargs.get("tools")
if not tools:
return None
# Check if any tool is a web search tool (native or already LiteLLM standard)
has_websearch = any(is_web_search_tool(t) for t in tools)
if not has_websearch:
return None
verbose_logger.debug(
"WebSearchInterception: Converting native web_search tools to LiteLLM standard"
)
# Convert native/custom web_search tools to LiteLLM standard
converted_tools = []
for tool in tools:
if is_web_search_tool(tool):
# Convert to LiteLLM standard web search tool
converted_tool = get_litellm_web_search_tool()
converted_tools.append(converted_tool)
verbose_logger.debug(
f"WebSearchInterception: Converted {tool.get('name', 'unknown')} "
f"(type={tool.get('type', 'none')}) to {LITELLM_WEB_SEARCH_TOOL_NAME}"
)
else:
# Keep other tools as-is
converted_tools.append(tool)
# Return modified kwargs with converted tools
return {"tools": converted_tools}
@classmethod
def from_config_yaml(
@ -104,6 +158,83 @@ class WebSearchInterceptionLogger(CustomLogger):
search_tool_name=search_tool_name,
)
async def async_pre_request_hook(
self, model: str, messages: List[Dict], kwargs: Dict
) -> Optional[Dict]:
"""
Pre-request hook to convert native web search tools to LiteLLM standard.
This hook is called before the API request is made, allowing us to:
1. Detect native web search tools (web_search_20250305, etc.)
2. Convert them to LiteLLM standard format (litellm_web_search)
3. Convert stream=True to stream=False for interception
This prevents providers like Bedrock from trying to execute web search
natively (which fails), and ensures our agentic loop can intercept tool_use.
Returns:
Modified kwargs dict with converted tools, or None if no modifications needed
"""
# Check if this request is for an enabled provider
custom_llm_provider = kwargs.get("litellm_params", {}).get(
"custom_llm_provider", ""
)
verbose_logger.debug(
f"WebSearchInterception: Pre-request hook called"
f" - custom_llm_provider={custom_llm_provider}"
f" - enabled_providers={self.enabled_providers}"
)
if custom_llm_provider not in self.enabled_providers:
verbose_logger.debug(
f"WebSearchInterception: Skipping - provider {custom_llm_provider} not in {self.enabled_providers}"
)
return None
# Check if request has tools
tools = kwargs.get("tools")
if not tools:
return None
# Check if any tool is a web search tool
has_websearch = any(is_web_search_tool(t) for t in tools)
if not has_websearch:
return None
verbose_logger.debug(
f"WebSearchInterception: Pre-request hook triggered for provider={custom_llm_provider}"
)
# Convert native web search tools to LiteLLM standard
converted_tools = []
for tool in tools:
if is_web_search_tool(tool):
standard_tool = get_litellm_web_search_tool()
converted_tools.append(standard_tool)
verbose_logger.debug(
f"WebSearchInterception: Converted {tool.get('name', 'unknown')} "
f"(type={tool.get('type', 'none')}) to {LITELLM_WEB_SEARCH_TOOL_NAME}"
)
else:
converted_tools.append(tool)
# Update kwargs with converted tools
kwargs["tools"] = converted_tools
verbose_logger.debug(
f"WebSearchInterception: Tools after conversion: {[t.get('name') for t in converted_tools]}"
)
# Convert stream=True to stream=False for WebSearch interception
if kwargs.get("stream"):
verbose_logger.debug(
"WebSearchInterception: Converting stream=True to stream=False"
)
kwargs["stream"] = False
kwargs["_websearch_interception_converted_stream"] = True
return kwargs
async def async_should_run_agentic_loop(
self,
response: Any,
@ -128,11 +259,11 @@ class WebSearchInterceptionLogger(CustomLogger):
)
return False, {}
# Check if tools include WebSearch
has_websearch_tool = any(t.get("name") == "WebSearch" for t in (tools or []))
# Check if tools include any web search tool (LiteLLM standard or native)
has_websearch_tool = any(is_web_search_tool(t) for t in (tools or []))
if not has_websearch_tool:
verbose_logger.debug(
"WebSearchInterception: No WebSearch tool in request"
"WebSearchInterception: No web search tool in request"
)
return False, {}

View file

@ -0,0 +1,95 @@
"""
LiteLLM Web Search Tool Definition
This module defines the standard web search tool used across LiteLLM.
Native provider tools (like Anthropic's web_search_20250305) are converted
to this format for consistent interception and execution.
"""
from typing import Any, Dict
from litellm.constants import LITELLM_WEB_SEARCH_TOOL_NAME
def get_litellm_web_search_tool() -> Dict[str, Any]:
"""
Get the standard LiteLLM web search tool definition.
This is the canonical tool definition that all native web search tools
(like Anthropic's web_search_20250305, Claude Code's web_search, etc.)
are converted to for interception.
Returns:
Dict containing the Anthropic-style tool definition with:
- name: Tool name
- description: What the tool does
- input_schema: JSON schema for tool parameters
Example:
>>> tool = get_litellm_web_search_tool()
>>> tool['name']
'litellm_web_search'
"""
return {
"name": LITELLM_WEB_SEARCH_TOOL_NAME,
"description": (
"Search the web for information. Use this when you need current "
"information or answers to questions that require up-to-date data."
),
"input_schema": {
"type": "object",
"properties": {
"query": {
"type": "string",
"description": "The search query to execute"
}
},
"required": ["query"]
}
}
def is_web_search_tool(tool: Dict[str, Any]) -> bool:
"""
Check if a tool is a web search tool (native or LiteLLM standard).
Detects:
- LiteLLM standard: name == "litellm_web_search"
- Anthropic native: type starts with "web_search_" (e.g., "web_search_20250305")
- Claude Code: name == "web_search" with a type field
- Custom: name == "WebSearch" (legacy format)
Args:
tool: Tool dictionary to check
Returns:
True if tool is a web search tool
Example:
>>> is_web_search_tool({"name": "litellm_web_search"})
True
>>> is_web_search_tool({"type": "web_search_20250305", "name": "web_search"})
True
>>> is_web_search_tool({"name": "calculator"})
False
"""
tool_name = tool.get("name", "")
tool_type = tool.get("type", "")
# Check for LiteLLM standard tool
if tool_name == LITELLM_WEB_SEARCH_TOOL_NAME:
return True
# Check for native Anthropic web_search_* types
if tool_type.startswith("web_search_"):
return True
# Check for Claude Code's web_search with a type field
if tool_name == "web_search" and tool_type:
return True
# Check for legacy WebSearch format
if tool_name == "WebSearch":
return True
return False

View file

@ -7,6 +7,7 @@ Transforms between Anthropic tool_use format and LiteLLM search format.
from typing import Any, Dict, List, Tuple
from litellm._logging import verbose_logger
from litellm.constants import LITELLM_WEB_SEARCH_TOOL_NAME
from litellm.llms.base_llm.search.transformation import SearchResponse
@ -94,17 +95,21 @@ class WebSearchTransformation:
block_id = getattr(block, "id", None)
block_input = getattr(block, "input", {})
if block_type == "tool_use" and block_name == "WebSearch":
# Check for LiteLLM standard or legacy web search tools
# Handles: litellm_web_search, WebSearch, web_search
if block_type == "tool_use" and block_name in (
LITELLM_WEB_SEARCH_TOOL_NAME, "WebSearch", "web_search"
):
# Convert to dict for easier handling
tool_call = {
"id": block_id,
"type": "tool_use",
"name": "WebSearch",
"name": block_name, # Preserve original name
"input": block_input,
}
tool_calls.append(tool_call)
verbose_logger.debug(
f"WebSearchInterception: Found WebSearch tool_use with id={tool_call['id']}"
f"WebSearchInterception: Found {block_name} tool_use with id={tool_call['id']}"
)
return len(tool_calls) > 0, tool_calls

View file

@ -0,0 +1,246 @@
"""
Fake Streaming Iterator for Anthropic Messages
This module provides a fake streaming iterator that converts non-streaming
Anthropic Messages responses into proper streaming format.
Used when WebSearch interception converts stream=True to stream=False but
the LLM doesn't make a tool call, and we need to return a stream to the user.
"""
import json
from typing import Any, Dict, List, cast
from litellm.types.llms.anthropic_messages.anthropic_response import (
AnthropicMessagesResponse,
)
class FakeAnthropicMessagesStreamIterator:
"""
Fake streaming iterator for Anthropic Messages responses.
Used when we need to convert a non-streaming response to a streaming format,
such as when WebSearch interception converts stream=True to stream=False but
the LLM doesn't make a tool call.
This creates a proper Anthropic-style streaming response with multiple events:
- message_start
- content_block_start (for each content block)
- content_block_delta (for text content, chunked)
- content_block_stop
- message_delta (for usage)
- message_stop
"""
def __init__(self, response: AnthropicMessagesResponse):
self.response = response
self.chunks = self._create_streaming_chunks()
self.current_index = 0
def _create_streaming_chunks(self) -> List[bytes]:
"""Convert the non-streaming response to streaming chunks"""
chunks = []
# Cast response to dict for easier access
response_dict = cast(Dict[str, Any], self.response)
# 1. message_start event
usage = response_dict.get("usage", {})
message_start = {
"type": "message_start",
"message": {
"id": response_dict.get("id"),
"type": "message",
"role": response_dict.get("role", "assistant"),
"model": response_dict.get("model"),
"content": [],
"stop_reason": None,
"stop_sequence": None,
"usage": {
"input_tokens": usage.get("input_tokens", 0) if usage else 0,
"output_tokens": 0
}
}
}
chunks.append(f"event: message_start\ndata: {json.dumps(message_start)}\n\n".encode())
# 2-4. For each content block, send start/delta/stop events
content_blocks = response_dict.get("content", [])
if content_blocks:
for index, block in enumerate(content_blocks):
# Cast block to dict for easier access
block_dict = cast(Dict[str, Any], block)
block_type = block_dict.get("type")
if block_type == "text":
# content_block_start
content_block_start = {
"type": "content_block_start",
"index": index,
"content_block": {
"type": "text",
"text": ""
}
}
chunks.append(f"event: content_block_start\ndata: {json.dumps(content_block_start)}\n\n".encode())
# content_block_delta (send full text as one delta for simplicity)
text = block_dict.get("text", "")
content_block_delta = {
"type": "content_block_delta",
"index": index,
"delta": {
"type": "text_delta",
"text": text
}
}
chunks.append(f"event: content_block_delta\ndata: {json.dumps(content_block_delta)}\n\n".encode())
# content_block_stop
content_block_stop = {
"type": "content_block_stop",
"index": index
}
chunks.append(f"event: content_block_stop\ndata: {json.dumps(content_block_stop)}\n\n".encode())
elif block_type == "thinking":
# content_block_start for thinking
content_block_start = {
"type": "content_block_start",
"index": index,
"content_block": {
"type": "thinking",
"thinking": "",
"signature": ""
}
}
chunks.append(f"event: content_block_start\ndata: {json.dumps(content_block_start)}\n\n".encode())
# content_block_delta for thinking text
thinking_text = block_dict.get("thinking", "")
if thinking_text:
content_block_delta = {
"type": "content_block_delta",
"index": index,
"delta": {
"type": "thinking_delta",
"thinking": thinking_text
}
}
chunks.append(f"event: content_block_delta\ndata: {json.dumps(content_block_delta)}\n\n".encode())
# content_block_delta for signature (if present)
signature = block_dict.get("signature", "")
if signature:
signature_delta = {
"type": "content_block_delta",
"index": index,
"delta": {
"type": "signature_delta",
"signature": signature
}
}
chunks.append(f"event: content_block_delta\ndata: {json.dumps(signature_delta)}\n\n".encode())
# content_block_stop
content_block_stop = {
"type": "content_block_stop",
"index": index
}
chunks.append(f"event: content_block_stop\ndata: {json.dumps(content_block_stop)}\n\n".encode())
elif block_type == "redacted_thinking":
# content_block_start for redacted_thinking
content_block_start = {
"type": "content_block_start",
"index": index,
"content_block": {
"type": "redacted_thinking"
}
}
chunks.append(f"event: content_block_start\ndata: {json.dumps(content_block_start)}\n\n".encode())
# content_block_stop (no delta for redacted thinking)
content_block_stop = {
"type": "content_block_stop",
"index": index
}
chunks.append(f"event: content_block_stop\ndata: {json.dumps(content_block_stop)}\n\n".encode())
elif block_type == "tool_use":
# content_block_start
content_block_start = {
"type": "content_block_start",
"index": index,
"content_block": {
"type": "tool_use",
"id": block_dict.get("id"),
"name": block_dict.get("name"),
"input": {}
}
}
chunks.append(f"event: content_block_start\ndata: {json.dumps(content_block_start)}\n\n".encode())
# content_block_delta (send input as JSON delta)
input_data = block_dict.get("input", {})
content_block_delta = {
"type": "content_block_delta",
"index": index,
"delta": {
"type": "input_json_delta",
"partial_json": json.dumps(input_data)
}
}
chunks.append(f"event: content_block_delta\ndata: {json.dumps(content_block_delta)}\n\n".encode())
# content_block_stop
content_block_stop = {
"type": "content_block_stop",
"index": index
}
chunks.append(f"event: content_block_stop\ndata: {json.dumps(content_block_stop)}\n\n".encode())
# 5. message_delta event (with final usage and stop_reason)
message_delta = {
"type": "message_delta",
"delta": {
"stop_reason": response_dict.get("stop_reason"),
"stop_sequence": response_dict.get("stop_sequence")
},
"usage": {
"output_tokens": usage.get("output_tokens", 0) if usage else 0
}
}
chunks.append(f"event: message_delta\ndata: {json.dumps(message_delta)}\n\n".encode())
# 6. message_stop event
message_stop = {
"type": "message_stop",
"usage": usage if usage else {}
}
chunks.append(f"event: message_stop\ndata: {json.dumps(message_stop)}\n\n".encode())
return chunks
def __aiter__(self):
return self
async def __anext__(self):
if self.current_index >= len(self.chunks):
raise StopAsyncIteration
chunk = self.chunks[self.current_index]
self.current_index += 1
return chunk
def __iter__(self):
return self
def __next__(self):
if self.current_index >= len(self.chunks):
raise StopIteration
chunk = self.chunks[self.current_index]
self.current_index += 1
return chunk

View file

@ -33,6 +33,70 @@ base_llm_http_handler = BaseLLMHTTPHandler()
#################################################
async def _execute_pre_request_hooks(
model: str,
messages: List[Dict],
tools: Optional[List[Dict]],
stream: Optional[bool],
custom_llm_provider: Optional[str],
**kwargs,
) -> Dict:
"""
Execute pre-request hooks from CustomLogger callbacks.
Allows CustomLoggers to modify request parameters before the API call.
Used for WebSearch tool conversion, stream modification, etc.
Args:
model: Model name
messages: List of messages
tools: Optional tools list
stream: Optional stream flag
custom_llm_provider: Provider name (if not set, will be extracted from model)
**kwargs: Additional request parameters
Returns:
Dict containing all (potentially modified) request parameters including tools, stream
"""
# If custom_llm_provider not provided, extract from model
if not custom_llm_provider:
try:
_, custom_llm_provider, _, _ = litellm.get_llm_provider(model=model)
except Exception:
# If extraction fails, continue without provider
pass
# Build complete request kwargs dict
request_kwargs = {
"tools": tools,
"stream": stream,
"litellm_params": {
"custom_llm_provider": custom_llm_provider,
},
**kwargs,
}
if not litellm.callbacks:
return request_kwargs
from litellm.integrations.custom_logger import CustomLogger as _CustomLogger
for callback in litellm.callbacks:
if not isinstance(callback, _CustomLogger):
continue
# Call the pre-request hook
modified_kwargs = await callback.async_pre_request_hook(
model, messages, request_kwargs
)
# If hook returned modified kwargs, use them
if modified_kwargs is not None:
request_kwargs = modified_kwargs
return request_kwargs
@client
async def anthropic_messages(
max_tokens: int,
@ -57,39 +121,24 @@ async def anthropic_messages(
"""
Async: Make llm api request in Anthropic /messages API spec
"""
# WebSearch Interception: Convert stream=True to stream=False if WebSearch interception is enabled
# This allows transparent server-side agentic loop execution for streaming requests
if stream and tools and any(t.get("name") == "WebSearch" for t in tools):
# Extract provider using litellm's helper function
try:
_, provider, _, _ = litellm.get_llm_provider(
model=model,
custom_llm_provider=custom_llm_provider,
api_base=api_base,
api_key=api_key,
)
except Exception:
# Fallback to simple split if helper fails
provider = model.split("/")[0] if "/" in model else ""
# Execute pre-request hooks to allow CustomLoggers to modify request
request_kwargs = await _execute_pre_request_hooks(
model=model,
messages=messages,
tools=tools,
stream=stream,
custom_llm_provider=custom_llm_provider,
**kwargs,
)
# Check if WebSearch interception is enabled in callbacks
from litellm._logging import verbose_logger
from litellm.integrations.websearch_interception import (
WebSearchInterceptionLogger,
)
if litellm.callbacks:
for callback in litellm.callbacks:
if isinstance(callback, WebSearchInterceptionLogger):
# Check if provider is enabled for interception
if provider in callback.enabled_providers:
verbose_logger.debug(
f"WebSearchInterception: Converting stream=True to stream=False for WebSearch interception "
f"(provider={provider})"
)
stream = False
break
# Extract modified parameters
tools = request_kwargs.pop("tools", tools)
stream = request_kwargs.pop("stream", stream)
# Remove litellm_params from kwargs (only needed for hooks)
request_kwargs.pop("litellm_params", None)
# Merge back any other modifications
kwargs.update(request_kwargs)
local_vars = locals()
loop = asyncio.get_event_loop()
kwargs["is_async"] = True
@ -206,6 +255,11 @@ def anthropic_messages_handler(
"model": original_model,
"custom_llm_provider": custom_llm_provider,
}
# Check if stream was converted for WebSearch interception
# This is set in the async wrapper above when stream=True is converted to stream=False
if kwargs.get("_websearch_interception_converted_stream", False):
litellm_logging_obj.model_call_details["websearch_interception_converted_stream"] = True
if litellm_params.mock_response and isinstance(litellm_params.mock_response, str):

View file

@ -4418,6 +4418,41 @@ class BaseLLMHTTPHandler:
f"LiteLLM.AgenticHookError: Exception in agentic completion hooks: {str(e)}"
)
# Check if we need to convert response to fake stream
# This happens when:
# 1. Stream was originally True but converted to False for WebSearch interception
# 2. No agentic loop ran (LLM didn't use the tool)
# 3. We have a non-streaming response that needs to be converted to streaming
websearch_converted_stream = (
logging_obj.model_call_details.get("websearch_interception_converted_stream", False)
if logging_obj is not None
else False
)
if websearch_converted_stream:
from typing import cast
from litellm._logging import verbose_logger
from litellm.llms.anthropic.experimental_pass_through.messages.fake_stream_iterator import (
FakeAnthropicMessagesStreamIterator,
)
from litellm.types.llms.anthropic_messages.anthropic_response import (
AnthropicMessagesResponse,
)
verbose_logger.debug(
"WebSearchInterception: No tool call made, converting non-streaming response to fake stream"
)
# Convert the non-streaming response to a fake stream
# The response should be an AnthropicMessagesResponse (dict)
if isinstance(response, dict):
# Create a fake streaming iterator
fake_stream = FakeAnthropicMessagesStreamIterator(
response=cast(AnthropicMessagesResponse, response)
)
return fake_stream
return None
def _handle_error(

View file

@ -46,7 +46,21 @@ model_list:
api_base: https://krish-mh44t553-eastus2.services.ai.azure.com
api_key: os.environ/AZURE_ANTHROPIC_API_KEY
# Search Tools Configuration - Define search providers for WebSearch interception
# search_tools:
# - search_tool_name: "my-perplexity-search"
# litellm_params:
# search_provider: "perplexity" # Can be: perplexity, brave, etc.
litellm_settings:
callbacks: ["websearch_interception"]
# WebSearch Interception - Automatically intercepts and executes WebSearch tool calls
# for models that don't natively support web search (e.g., Bedrock/Claude)
websearch_interception_params:
enabled_providers: ["bedrock"] # List of providers to enable interception for
search_tool_name: "my-perplexity-search" # Optional: Name of search tool from search_tools config
general_settings:
store_prompts_in_spend_logs: true
forward_client_headers_to_llm_api: true
forward_client_headers_to_llm_api: true

8
poetry.lock generated
View file

@ -3081,15 +3081,15 @@ files = [
[[package]]
name = "litellm-proxy-extras"
version = "0.4.21"
version = "0.4.23"
description = "Additional files for the LiteLLM Proxy. Reduces the size of the main litellm package."
optional = true
python-versions = "!=2.7.*,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,!=3.7.*,>=3.8"
groups = ["main"]
markers = "extra == \"proxy\""
files = [
{file = "litellm_proxy_extras-0.4.21-py3-none-any.whl", hash = "sha256:83a1734e9773610945230606012e602bbcbfba1c60fde836d51102c1a296f166"},
{file = "litellm_proxy_extras-0.4.21.tar.gz", hash = "sha256:fa0e012984aa8e5114f88f4bad53d6abb589e5ca3eab445f74f8ddeceb62d848"},
{file = "litellm_proxy_extras-0.4.23-py3-none-any.whl", hash = "sha256:dfda21203dde9fd97cf364396a9b5be0cfdf00fa9846439ee33ce11b7a52f9ce"},
{file = "litellm_proxy_extras-0.4.23.tar.gz", hash = "sha256:8e3f95576dc2a296e7f73d8c87e73628bd899b4644c45863960fe3c3762d8f64"},
]
[[package]]
@ -7981,4 +7981,4 @@ utils = ["numpydoc"]
[metadata]
lock-version = "2.1"
python-versions = ">=3.9,<4.0"
content-hash = "ea62b77c662ab9fc486e421c576f0868bcde16d62a24703ee1f4916a0465ffb2"
content-hash = "2d6b3d8d44919c29315b5e645befbf745a276714a2454c563d460a6a001b90af"

View file

@ -1,6 +1,6 @@
[tool.poetry]
name = "litellm"
version = "1.80.17"
version = "1.81.0"
description = "Library to easily interface with LLM API providers"
authors = ["BerriAI"]
license = "MIT"
@ -167,7 +167,7 @@ requires = ["poetry-core", "wheel"]
build-backend = "poetry.core.masonry.api"
[tool.commitizen]
version = "1.80.17"
version = "1.81.0"
version_files = [
"pyproject.toml:^version"
]

View file

@ -1,33 +0,0 @@
import json
import os
import sys
from datetime import datetime
import pytest
sys.path.insert(
0, os.path.abspath("../../")
) # Adds the parent directory to the system-path
import litellm
@pytest.mark.asyncio()
async def test_aiohttp_openai():
litellm.set_verbose = True
response = await litellm.acompletion(
model="aiohttp_openai/fake-model",
messages=[{"role": "user", "content": "Hello, world!"}],
api_base="https://exampleopenaiendpoint-production.up.railway.app/v1/chat/completions",
api_key="fake-key",
)
print(response)
@pytest.mark.asyncio()
async def test_aiohttp_openai_gpt_4o():
litellm.set_verbose = True
response = await litellm.acompletion(
model="aiohttp_openai/gpt-4o",
messages=[{"role": "user", "content": "Hello, world!"}],
)
print(response)

View file

@ -30,6 +30,7 @@ def test_deepseek_mock_completion(stream):
messages=[{"role": "user", "content": "Hello, world!"}],
api_base="https://exampleopenaiendpoint-production.up.railway.app/v1/chat/completions",
stream=stream,
mock_response="Hello! How can I help you today?",
)
print(f"response: {response}")
if stream:

View file

@ -1358,9 +1358,10 @@ def test_router_fallbacks_with_custom_model_costs():
"model_name": "claude-sonnet-4-5-20250929",
"litellm_params": {
"model": "claude-sonnet-4-5-20250929",
"api_key": os.environ["ANTHROPIC_API_KEY"],
"api_key": os.environ.get("ANTHROPIC_API_KEY", "fake-key"),
"input_cost_per_token": 30,
"output_cost_per_token": 60,
"mock_response": "Hello! How can I help you today?",
},
},
{
@ -1371,6 +1372,7 @@ def test_router_fallbacks_with_custom_model_costs():
"output_cost_per_token": 0.000015, # 15$/M
"api_base": "https://exampleopenaiendpoint-production.up.railway.app",
"api_key": "my-fake-key",
"mock_response": "Hello! How can I help you today?",
},
},
]

View file

@ -323,3 +323,632 @@ async def test_websearch_interception_streaming():
import traceback
traceback.print_exc()
return False
async def test_websearch_interception_no_tool_call_streaming():
"""
Test WebSearch interception when LLM doesn't make a tool call with streaming.
This tests the scenario where:
1. User requests stream=True
2. WebSearch tool is provided
3. LLM decides NOT to use the tool (just responds with text)
4. System should return a fake stream
"""
print("\n" + "="*80)
print("E2E TEST 3: WebSearch Interception (No Tool Call, Streaming)")
print("="*80)
# Router already initialized from test 1
print("\n✅ Using existing router configuration")
print("✅ WebSearch interception already enabled for Bedrock")
try:
# Make request with WebSearch tool AND stream=True
# Use a query that the LLM will answer directly without using the tool
print("\n📞 Making litellm.messages.acreate() call with stream=True...")
print(f" Model: bedrock/us.anthropic.claude-3-5-sonnet-20241022-v2:0")
print(f" Query: 'What is 2+2?'")
print(f" Tools: WebSearch")
print(f" Stream: True")
response = await messages.acreate(
model="bedrock/us.anthropic.claude-3-5-sonnet-20241022-v2:0",
messages=[{"role": "user", "content": "What is 2+2? Just give me the answer, no need to search."}],
tools=[
{
"name": "WebSearch",
"description": "Search the web for information",
"input_schema": {
"type": "object",
"properties": {
"query": {
"type": "string",
"description": "The search query",
}
},
"required": ["query"],
},
}
],
max_tokens=1024,
stream=True, # REQUEST STREAMING
)
print("\n✅ Received response!")
# Check if response is actually a stream (async generator or async iterator)
import inspect
is_async_gen = inspect.isasyncgen(response)
is_async_iter = hasattr(response, '__aiter__') and hasattr(response, '__anext__')
is_stream = is_async_gen or is_async_iter
if not is_stream:
print("\n❌ TEST 3 FAILED: Response is NOT a stream")
print(f"❌ Expected a fake stream when LLM doesn't use the tool")
print(f"❌ Response type: {type(response)}")
return False
print(f"✅ Response is a stream (async_gen={is_async_gen}, async_iter={is_async_iter})")
print("\n📦 Consuming stream chunks:")
chunks = []
chunk_count = 0
async for chunk in response:
chunk_count += 1
print(f"\n--- Chunk {chunk_count} ---")
print(f" Type: {type(chunk)}")
print(f" Content: {chunk[:200] if isinstance(chunk, bytes) else str(chunk)[:200]}...")
chunks.append(chunk)
print(f"\n✅ Received {len(chunks)} stream chunk(s)")
if len(chunks) > 0:
print("\n" + "="*80)
print("✅ TEST 3 PASSED!")
print("="*80)
print("✅ User made ONE litellm.messages.acreate() call with stream=True")
print("✅ LLM didn't use the WebSearch tool")
print("✅ Got back a fake stream (not a non-streaming response)")
print("✅ WebSearch interception handles no-tool-call case correctly!")
print("="*80)
return True
else:
print("\n❌ TEST 3 FAILED: No chunks received")
return False
except Exception as e:
print(f"\n❌ Test 3 failed with error: {str(e)}")
import traceback
traceback.print_exc()
return False
async def test_claude_code_native_websearch():
"""
Test WebSearch interception with Claude Code's native web_search_20250305 tool.
This tests the exact request format that Claude Code sends:
- tools: [{'type': 'web_search_20250305', 'name': 'web_search', 'max_uses': 8}]
- Model: bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0
"""
print("\n" + "="*80)
print("E2E TEST: Claude Code Native WebSearch (web_search_20250305)")
print("="*80)
# Router already initialized from test 1
print("\n✅ Using existing router configuration")
print("✅ WebSearch interception already enabled for Bedrock")
try:
# Make request with Claude Code's exact native web_search tool format
print("\n📞 Making litellm.messages.acreate() call...")
print(f" Model: bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0")
print(f" Query: 'Perform a web search for the query: litellm what is it'")
print(f" Tools: Native web_search_20250305")
print(f" Stream: False")
response = await messages.acreate(
model="bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0",
messages=[{"role": "user", "content": "Perform a web search for the query: litellm what is it"}],
tools=[
{
"type": "web_search_20250305",
"name": "web_search",
"max_uses": 8
}
],
max_tokens=1024,
stream=False,
)
print("\n✅ Received response!")
# Handle both dict and object responses
if isinstance(response, dict):
response_id = response.get("id")
response_model = response.get("model")
response_stop_reason = response.get("stop_reason")
response_content = response.get("content", [])
else:
response_id = response.id
response_model = response.model
response_stop_reason = response.stop_reason
response_content = response.content
print(f"\n📄 Response ID: {response_id}")
print(f"📄 Model: {response_model}")
print(f"📄 Stop Reason: {response_stop_reason}")
print(f"📄 Content blocks: {len(response_content)}")
# Debug: Print all content block types
for i, block in enumerate(response_content):
block_type = block.get("type") if isinstance(block, dict) else block.type
print(f" Block {i}: type={block_type}")
if block_type == "tool_use":
block_name = block.get("name") if isinstance(block, dict) else block.name
print(f" name={block_name}")
# Validate response
assert response is not None, "Response should not be None"
assert response_content is not None, "Response should have content"
assert len(response_content) > 0, "Response should have at least one content block"
# Check if response contains tool_use (means interception didn't work)
has_tool_use = any(
(block.get("type") if isinstance(block, dict) else block.type) == "tool_use"
for block in response_content
)
# Check if we got a text response
has_text = any(
(block.get("type") if isinstance(block, dict) else block.type) == "text"
for block in response_content
)
if has_tool_use:
print("\n❌ TEST FAILED: Interception did not work")
print(f"❌ Stop reason: {response_stop_reason}")
print("❌ Response contains tool_use blocks")
return False
elif has_text and response_stop_reason != "tool_use":
text_block = next(
block for block in response_content
if (block.get("type") if isinstance(block, dict) else block.type) == "text"
)
text_content = text_block.get("text") if isinstance(text_block, dict) else text_block.text
print(f"\n📝 Response Text:")
print(f" {text_content[:200]}...")
if "litellm" in text_content.lower():
print("\n" + "="*80)
print("✅ TEST PASSED!")
print("="*80)
print("✅ Claude Code's native web_search_20250305 tool was intercepted")
print("✅ Tool was converted to LiteLLM standard format")
print("✅ User made ONE litellm.messages.acreate() call")
print("✅ Got back final answer with search results")
print("✅ Agentic loop executed transparently")
print("✅ WebSearch interception working with Claude Code!")
print("="*80)
return True
else:
print("\n⚠️ Got text response but doesn't mention LiteLLM")
return False
else:
print("\n❌ Unexpected response format")
return False
except Exception as e:
print(f"\n❌ Test failed with error: {str(e)}")
import traceback
traceback.print_exc()
return False
if __name__ == "__main__":
import asyncio
async def run_all_tests():
"""Run all E2E tests"""
test_results = []
# Test 1: Non-streaming
result1 = await test_websearch_interception_non_streaming()
test_results.append(("Non-Streaming", result1))
# Test 2: Streaming
result2 = await test_websearch_interception_streaming()
test_results.append(("Streaming", result2))
# Test 3: No tool call with streaming
result3 = await test_websearch_interception_no_tool_call_streaming()
test_results.append(("No Tool Call Streaming", result3))
# Test 4: Claude Code native web_search
result4 = await test_claude_code_native_websearch()
test_results.append(("Claude Code Native WebSearch", result4))
# Print summary
print("\n" + "="*80)
print("TEST SUMMARY")
print("="*80)
for test_name, result in test_results:
status = "✅ PASSED" if result else "❌ FAILED"
print(f"{test_name}: {status}")
print("="*80)
# Return overall result
return all(result for _, result in test_results)
result = asyncio.run(run_all_tests())
import sys
sys.exit(0 if result else 1)
async def test_litellm_standard_websearch_tool():
"""
PRIORITY TEST #1: Test with the canonical litellm_web_search tool format.
This validates that using get_litellm_web_search_tool() directly
works end-to-end without any conversion needed.
"""
print("\n" + "="*80)
print("E2E TEST: LiteLLM Standard WebSearch Tool")
print("="*80)
from litellm.integrations.websearch_interception import get_litellm_web_search_tool
print("\n✅ Using existing router configuration")
print("✅ WebSearch interception already enabled for Bedrock")
try:
print("\n📞 Making litellm.messages.acreate() call...")
print(f" Model: bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0")
print(f" Query: 'What is the latest news about AI?'")
print(f" Tool: litellm_web_search (standard format, no conversion needed)")
print(f" Stream: False")
response = await messages.acreate(
model="bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0",
messages=[{"role": "user", "content": "What is the latest news about AI? Give me a brief overview."}],
tools=[get_litellm_web_search_tool()],
max_tokens=1024,
stream=False,
)
print("\n✅ Received response!")
if isinstance(response, dict):
response_id = response.get("id")
response_stop_reason = response.get("stop_reason")
response_content = response.get("content", [])
else:
response_id = response.id
response_stop_reason = response.stop_reason
response_content = response.content
print(f"\n📄 Response ID: {response_id}")
print(f"📄 Stop Reason: {response_stop_reason}")
print(f"📄 Content blocks: {len(response_content)}")
for i, block in enumerate(response_content):
block_type = block.get("type") if isinstance(block, dict) else block.type
print(f" Block {i}: type={block_type}")
has_tool_use = any(
(block.get("type") if isinstance(block, dict) else block.type) == "tool_use"
for block in response_content
)
has_text = any(
(block.get("type") if isinstance(block, dict) else block.type) == "text"
for block in response_content
)
if has_tool_use:
print("\n❌ TEST FAILED: Interception did not work")
return False
elif has_text and response_stop_reason != "tool_use":
text_block = next(
block for block in response_content
if (block.get("type") if isinstance(block, dict) else block.type) == "text"
)
text_content = text_block.get("text") if isinstance(text_block, dict) else text_block.text
print(f"\n📝 Response Text: {text_content[:200]}...")
print("\n" + "="*80)
print("✅ TEST PASSED!")
print("="*80)
print("✅ LiteLLM standard tool format works without conversion")
print("✅ Agentic loop executed transparently")
print("="*80)
return True
else:
print("\n❌ Unexpected response format")
return False
except Exception as e:
print(f"\n❌ Test failed with error: {str(e)}")
import traceback
traceback.print_exc()
return False
async def test_claude_code_native_websearch_streaming():
"""
PRIORITY TEST #2: Test Claude Code's native tool WITH stream=True.
Validates:
- Native tool conversion (web_search_20250305 litellm_web_search)
- Stream=True Stream=False conversion
- Agentic loop executes with both conversions
"""
print("\n" + "="*80)
print("E2E TEST: Claude Code Native WebSearch + Streaming")
print("="*80)
print("\n✅ Using existing router configuration")
print("✅ WebSearch interception already enabled for Bedrock")
try:
print("\n📞 Making litellm.messages.acreate() call with stream=True...")
print(f" Model: bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0")
print(f" Tool: Native web_search_20250305")
print(f" Stream: True (will be converted to False)")
response = await messages.acreate(
model="bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0",
messages=[{"role": "user", "content": "Search for the latest AI developments."}],
tools=[{"type": "web_search_20250305", "name": "web_search", "max_uses": 8}],
max_tokens=1024,
stream=True,
)
print("\n✅ Received response!")
import inspect
is_stream = inspect.isasyncgen(response)
if is_stream:
print("\n⚠️ Response is a stream (stream conversion didn't work)")
return False
print("✅ Response is NOT a stream (conversion worked!)")
if isinstance(response, dict):
response_stop_reason = response.get("stop_reason")
response_content = response.get("content", [])
else:
response_stop_reason = response.stop_reason
response_content = response.content
has_tool_use = any(
(block.get("type") if isinstance(block, dict) else block.type) == "tool_use"
for block in response_content
)
has_text = any(
(block.get("type") if isinstance(block, dict) else block.type) == "text"
for block in response_content
)
if has_tool_use:
print("\n❌ TEST FAILED: Interception did not work")
return False
elif has_text and response_stop_reason != "tool_use":
print("\n" + "="*80)
print("✅ TEST PASSED!")
print("="*80)
print("✅ Native tool converted to litellm_web_search")
print("✅ Stream=True converted to Stream=False")
print("✅ Both conversions working together!")
print("="*80)
return True
else:
print("\n❌ Unexpected response format")
return False
except Exception as e:
print(f"\n❌ Test failed with error: {str(e)}")
import traceback
traceback.print_exc()
return False
def test_is_web_search_tool_detection():
"""
PRIORITY TEST #3: Unit test for is_web_search_tool() utility.
Validates detection of all supported formats including future versions.
"""
print("\n" + "="*80)
print("UNIT TEST: Web Search Tool Detection")
print("="*80)
from litellm.integrations.websearch_interception import is_web_search_tool
test_cases = [
({"name": "litellm_web_search"}, True, "LiteLLM standard tool"),
({"type": "web_search_20250305", "name": "web_search", "max_uses": 8}, True, "Current Anthropic native (2025)"),
({"type": "web_search_2026", "name": "web_search"}, True, "Future Anthropic native (2026)"),
({"type": "web_search_20270615", "name": "web_search"}, True, "Future Anthropic native (2027)"),
({"name": "web_search", "type": "web_search_20250305"}, True, "Claude Code format"),
({"name": "WebSearch"}, True, "Legacy WebSearch"),
({"name": "calculator"}, False, "Non-web-search tool"),
({"name": "some_tool", "type": "function"}, False, "Other tool with type"),
({"type": "custom_tool"}, False, "Custom tool type"),
]
passed = 0
failed = 0
for tool, expected, description in test_cases:
result = is_web_search_tool(tool)
if result == expected:
print(f" ✅ PASS: {description}")
passed += 1
else:
print(f" ❌ FAIL: {description}")
print(f" Tool: {tool}")
print(f" Expected: {expected}, Got: {result}")
failed += 1
print(f"\n📊 Results: {passed} passed, {failed} failed")
if failed == 0:
print("\n" + "="*80)
print("✅ ALL DETECTION TESTS PASSED!")
print("="*80)
print("✅ Detects all current formats")
print("✅ Future-proof for new web_search_* versions")
print("="*80)
return True
else:
print("\n❌ Some detection tests failed")
return False
async def test_pre_request_hook_modifies_request_body():
"""
Unit test to verify async_pre_request_hook correctly modifies request body.
Tests that:
1. WebSearchInterceptionLogger is active
2. Native web_search_20250305 tool is converted to litellm_web_search
3. Stream is converted from True to False
4. Modified parameters reach the API call
"""
import asyncio
from unittest.mock import AsyncMock, patch, MagicMock
from litellm.constants import LITELLM_WEB_SEARCH_TOOL_NAME
litellm._turn_on_debug()
print("\n" + "="*80)
print("UNIT TEST: Pre-Request Hook Modifies Request Body")
print("="*80)
# Initialize WebSearchInterceptionLogger
litellm.callbacks = [
WebSearchInterceptionLogger(
enabled_providers=[LlmProviders.BEDROCK],
search_tool_name="test-search-tool"
)
]
print("✅ WebSearchInterceptionLogger initialized")
# Track what actually gets sent to the API
captured_request = {}
def mock_anthropic_messages_handler(
max_tokens,
messages,
model,
metadata=None,
stop_sequences=None,
stream=None,
system=None,
temperature=None,
thinking=None,
tool_choice=None,
tools=None,
top_k=None,
top_p=None,
container=None,
api_key=None,
api_base=None,
client=None,
custom_llm_provider=None,
**kwargs
):
"""Mock handler that captures the actual request parameters"""
# Capture what gets sent to the handler (after hook modifications)
captured_request['tools'] = tools
captured_request['stream'] = stream
captured_request['max_tokens'] = max_tokens
captured_request['model'] = model
# Return a mock response (non-streaming)
from litellm.types.llms.anthropic_messages.anthropic_response import AnthropicMessagesResponse
return AnthropicMessagesResponse(
id="msg_test",
type="message",
role="assistant",
content=[{
"type": "text",
"text": "Test response"
}],
model="claude-sonnet-4-5",
stop_reason="end_turn",
usage={
"input_tokens": 10,
"output_tokens": 20
}
)
# Patch the anthropic_messages_handler function (called after hooks)
with patch('litellm.llms.anthropic.experimental_pass_through.messages.handler.anthropic_messages_handler',
side_effect=mock_anthropic_messages_handler):
print("\n📝 Making request with native web_search_20250305 tool (stream=True)...")
# Make the request with native tool format
response = await messages.acreate(
model="bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0",
messages=[{"role": "user", "content": "Test query"}],
tools=[{
"type": "web_search_20250305",
"name": "web_search",
"max_uses": 8
}],
max_tokens=100,
stream=True # Should be converted to False
)
print("\n🔍 Verifying request modifications...")
# Verify tool was converted
tools = captured_request.get('tools')
print(f"\n Captured tools: {tools}")
if tools and len(tools) > 0:
tool = tools[0]
tool_name = tool.get('name')
if tool_name == LITELLM_WEB_SEARCH_TOOL_NAME:
print(f" ✅ Tool converted: web_search_20250305 → {LITELLM_WEB_SEARCH_TOOL_NAME}")
else:
print(f" ❌ Tool NOT converted: expected {LITELLM_WEB_SEARCH_TOOL_NAME}, got {tool_name}")
return False
else:
print(" ❌ No tools captured in request")
return False
# Verify stream was converted
stream = captured_request.get('stream')
print(f" Captured stream: {stream}")
if stream is False:
print(" ✅ Stream converted: True → False")
else:
print(f" ❌ Stream NOT converted: expected False, got {stream}")
return False
print("\n" + "="*80)
print("✅ PRE-REQUEST HOOK TEST PASSED!")
print("="*80)
print("✅ CustomLogger is active")
print("✅ async_pre_request_hook modifies request body")
print("✅ Tool conversion works correctly")
print("✅ Stream conversion works correctly")
print("="*80)
return True