What's Changed

This release updates the package for compatibility with LangChain v1.0. See the v1.0 release notes for details on what's new.

What's Changed

This release updates the package for compatibility with LangChain v1.0. See the v1.0 release notes for details on what's new.

What's Changed

This release updates the package for compatibility with LangChain v1.0. See the v1.0 release notes for details on what's new.

What's Changed

This release updates the package for compatibility with LangChain v1.0. See the v1.0 release notes for details on what's new.

What's Changed

This release updates the package for compatibility with LangChain v1.0. See the v1.0 release notes for details on what's new.

What's Changed

This release updates the package for compatibility with LangChain v1.0. See the v1.0 release notes for details on what's new.

What's Changed

This release updates the package for compatibility with LangChain v1.0. See the v1.0 release notes for details on what's new.

🚀 New Features

• Context Editing Middleware (#9118): Added middleware for editing conversation context dynamically
• Tool Call Limit Middleware (#9121): Implemented middleware to limit the number of tool calls during agent execution
• Retry Model Request Hook (#9128): Added retry functionality for model requests in middleware
• Call Count Tracking (#9090): Introduced call counts through private state for better monitoring and control
• Custom Interrupted Tool Descriptions (#9116): Added ability to pass in a description factory for interrupted tool calls
• PII Redaction Middleware (#9058): Added middleware for automatically redacting personally identifiable information
• Perplexity Support: Added Perplexity provider support to universal chat model

🐛 Bug Fixes

• LLM Tool Selector Implementation (#9127): Updated implementation of LLMToolSelector middleware for improved reliability
• LangGraph Integration (#9117): Fixed integration issues with LangGraph
• Tool Instance Handling (#9119): Fixed tools in ModelRequest to return tool instances instead of serialized objects
• TypeScript Type Inference (#9087): Exported all symbols to enable proper TypeScript type inference
• Prompt Caching Immutability (#9086): Fixed PromptCachingMiddleware to return new message objects instead of modifying existing ones
• Input Type Support (#9080): Improved input types to support a wider range of type definitions
• Tools Node Creation (#9074): Fixed to only create tools node for client-provided tools
• Planning Middleware Adjustments (#9070): Minor improvements to planning middleware behavior
• Hub Prompt Schema Binding (#9057): Fixed schema binding for various types of pulled hub prompts

🚀 New Features

• Todo Middleware (#9051): Added new todo middleware functionality for agent workflows
• LLM Tool Selector Middleware (#9050): Implemented llmToolSelectorMiddleware (bigTool) for intelligent tool selection
• Middleware Tool Definition (#9046): Middleware can now define their own tools dynamically
• Dynamic Prompt Middleware (#8993): Added built-in middleware for dynamic prompt generation
• Unsupported Model Behavior (#9039): Added unsupportedModelBehavior property to anthropic middleware

🐛 Bug Fixes

• System Prompt Consistency (#9045): Fixed system prompt handling across all agent components
• Zod Interoperability (#9029): Improved compatibility between Zod v3 and v4
• Structured Output Handling (#9033): Improved structured output processing for agents
• Graph Support for Jumps (#9035): Added statically typed graph support for agent jumps
• Tool Configuration Naming (#9034): Renamed toolConfigs to interruptOn for clarity
• LLM Property Removal (#9017): Removed llm prop from middleware agent
• Message Handling: Fixed grabbing last AIMessage from list instead of just looking at last message
• Memory Saver Export (#8996): Removed incorrect MemorySaver re-export
• Middleware Naming (#8912): Fixed "middlewares" property naming to "middleware"
• Cache Control Verification: Actually verify cache control values in usage response
• Message Instance Checking (#8905): Use isInstance for message validation

📦 Dependency and Build Fixes

• OpenAI Provider Dependency (#8920): Removed dependency to openai provider package (alpha.6)
• Internal ESLint Package (#8770): Created internal ESLint package (alpha.6)
• Zod v4 Support (#8792): Updated to support Zod v4 (alpha.6)
• Test Console Logs (#8998): Removed console logs in test files (alpha.7)

🚀 New Features

• Google AI Standard Content (#9024): Added comprehensive standard content support for Google GenAI and Vertex AI
• AWS Bedrock Standard Content (#9013): Implemented standard content support for AWS Bedrock Converse
• Server Tool Blocks (#9000): Added server tool blocks to standard content system
• Zod Interoperability (#9029): Improved compatibility between Zod v3 and v4

🐛 Bug Fixes

• Response Metadata Type Mismatch (#9010): Fixed type mismatches in response metadata
• Message Index Cleanup (#8972): Refined message exports

🔧 Technical Improvements

• Google AI Integration: Significantly enhanced Google GenAI and Vertex AI block translators
• AWS Bedrock Integration: Major improvements to Bedrock Converse support
• Content Index Updates: Enhanced content module exports