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Nov 25, 2025

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v1.1.0

  • Model profiles: Chat models now expose supported features and capabilities through a .profile getter. These data are derived from models.dev, an open source project providing model capability data.
  • Model retry middleware: New middleware for automatically retrying failed model calls with configurable exponential backoff, improving agent reliability.
  • Content moderation middleware: OpenAI content moderation middleware for detecting and handling unsafe content in agent interactions. Supports checking user input, model output, and tool results.
  • Summarization middleware: Updated to support flexible trigger points using model profiles for context-aware summarization.
  • Structured output: ProviderStrategy support (native structured output) can now be inferred from model profiles.
  • SystemMessage for createAgent: Support for passing SystemMessage instances directly to createAgent’s systemPrompt parameter and a new concat method for extending system messages. Enables advanced features like cache control and structured content blocks.
  • Dynamic system prompt middleware: Return values from dynamicSystemPromptMiddleware are now purely additive. When returning a SystemMessage or string, they are merged with existing system messages rather than replacing them, making it easier to compose multiple middleware that modify the prompt.
  • Compatibility improvements: Fixed error handling for Zod v4 validation errors in structured output and tool schemas, ensuring detailed error messages are properly displayed.
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Oct 20, 2025

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v1.0.0

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