📁 ai-sdk/docs/reference/ai-sdk-core
File: ai-sdk-core.md | Updated: 11/15/2025
Source: https://ai-sdk.dev/docs/reference/ai-sdk-core
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AI SDK 5.x
Model Context Protocol (MCP) Tools
Experimental_StdioMCPTransport
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AI SDK Core is a set of functions that allow you to interact with language models and other AI models. These functions are designed to be easy-to-use and flexible, allowing you to generate text, structured data, and embeddings from language models and other AI models.
AI SDK Core contains the following main functions:
generateText()
Generate text and call tools from a language model.
streamText()
Stream text and call tools from a language model.
generateObject()
Generate structured data from a language model.
streamObject()
Stream structured data from a language model.
embed()
Generate an embedding for a single value using an embedding model.
embedMany()
Generate embeddings for several values using an embedding model (batch embedding).
experimental_generateImage()
Generate images based on a given prompt using an image model.
experimental_transcribe()
Generate a transcript from an audio file.
experimental_generateSpeech()
Generate speech audio from text.
It also contains the following helper functions:
tool()
Type inference helper function for tools.
experimental_createMCPClient()
Creates a client for connecting to MCP servers.
jsonSchema()
Creates AI SDK compatible JSON schema objects.
zodSchema()
Creates AI SDK compatible Zod schema objects.
createProviderRegistry()
Creates a registry for using models from multiple providers.
cosineSimilarity()
Calculates the cosine similarity between two vectors, e.g. embeddings.
simulateReadableStream()
Creates a ReadableStream that emits values with configurable delays.
wrapLanguageModel()
Wraps a language model with middleware.
extractReasoningMiddleware()
Extracts reasoning from the generated text and exposes it as a `reasoning` property on the result.
simulateStreamingMiddleware()
Simulates streaming behavior with responses from non-streaming language models.
defaultSettingsMiddleware()
Applies default settings to a language model.
smoothStream()
Smooths text streaming output.
generateId()
Helper function for generating unique IDs
createIdGenerator()
Creates an ID generator
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