--- title: AI SDK Core description: Reference documentation for the AI SDK Core url: "https://ai-sdk.dev/docs/reference/ai-sdk-core" docs_index: /llms.txt --- > For an index of all documentation, see [/llms.txt](/llms.txt). [AI SDK Core](/docs/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()](/docs/reference/ai-sdk-core/generate-text) Generate text and call tools from a language model. #### [streamText()](/docs/reference/ai-sdk-core/stream-text) Stream text and call tools from a language model. #### [Output](/docs/reference/ai-sdk-core/output) Structured output types for generateText and streamText. #### [embed()](/docs/reference/ai-sdk-core/embed) Generate an embedding for a single value using an embedding model. #### [embedMany()](/docs/reference/ai-sdk-core/embed-many) Generate embeddings for several values using an embedding model (batch embedding). #### [generateImage()](/docs/reference/ai-sdk-core/generate-image) Generate images based on a given prompt using an image model. #### [experimental\_generateVideo()](/docs/reference/ai-sdk-core/generate-video) Generate videos based on a given prompt using a video model. #### [experimental\_startBatch()](/docs/reference/ai-sdk-core/start-batch) Start an asynchronous text-generation batch. #### [experimental\_getBatchStatus()](/docs/reference/ai-sdk-core/get-batch-status) Retrieve the status of an asynchronous batch. #### [experimental\_getBatchResults()](/docs/reference/ai-sdk-core/get-batch-results) Retrieve terminal results from an asynchronous batch. #### [experimental\_cancelBatch()](/docs/reference/ai-sdk-core/cancel-batch) Request cancellation of an asynchronous batch. #### [experimental\_listBatches()](/docs/reference/ai-sdk-core/list-batches) List asynchronous batches and their latest statuses. #### [transcribe()](/docs/reference/ai-sdk-core/transcribe) Generate a transcript from an audio file. #### [experimental\_streamTranscribe()](/docs/reference/ai-sdk-core/stream-transcribe) Stream a transcript from live raw audio. #### [experimental\_streamTranslate()](/docs/reference/ai-sdk-core/stream-translate) Stream a speech-to-speech translation from live raw audio. #### [generateSpeech()](/docs/reference/ai-sdk-core/generate-speech) Generate speech audio from text. #### [experimental\_streamSpeech()](/docs/reference/ai-sdk-core/stream-speech) Stream speech audio from text or a text stream. #### [uploadFile()](/docs/reference/ai-sdk-core/upload-file) Upload a file to a provider and get a provider reference. #### [uploadSkill()](/docs/reference/ai-sdk-core/upload-skill) Upload a skill to a provider and get a provider reference. It also contains the following helper functions: #### [toolSearch()](/docs/reference/ai-sdk-core/tool-search) Search deferred tools and load their definitions on demand. #### [tool()](/docs/reference/ai-sdk-core/tool) Type inference helper function for tools. #### [experimental\_getRealtimeToolDefinitions()](/docs/reference/ai-sdk-core/get-realtime-tool-definitions) Convert AI SDK tools into realtime tool definitions. #### [Experimental\_SandboxSession](/docs/reference/ai-sdk-core/sandbox) Experimental execution environment interface passed to tool execution. #### [filterActiveTools()](/docs/reference/ai-sdk-core/filter-active-tools) Filters a tool set to only the currently active tools. #### [createMCPClient()](/docs/reference/ai-sdk-core/create-mcp-client) Creates a client for connecting to MCP servers. #### [MCP Events](/docs/reference/ai-sdk-core/mcp-events) Experimental event methods, webhook delivery, and subscription types. #### [MCP Apps](/docs/reference/ai-sdk-core/mcp-apps) Helpers for rendering interactive MCP tool UIs and filtering app-visible tools. #### [jsonSchema()](/docs/reference/ai-sdk-core/json-schema) Creates AI SDK compatible JSON schema objects. #### [zodSchema()](/docs/reference/ai-sdk-core/zod-schema) Creates AI SDK compatible Zod schema objects. #### [createProviderRegistry()](/docs/reference/ai-sdk-core/provider-registry) Creates a registry for using models from multiple providers. #### [cosineSimilarity()](/docs/reference/ai-sdk-core/cosine-similarity) Calculates the cosine similarity between two vectors, e.g. embeddings. #### [simulateReadableStream()](/docs/reference/ai-sdk-core/simulate-readable-stream) Creates a ReadableStream that emits values with configurable delays. #### [wrapLanguageModel()](/docs/reference/ai-sdk-core/wrap-language-model) Wraps a language model with middleware. #### [wrapImageModel()](/docs/reference/ai-sdk-core/wrap-image-model) Wraps an image model with middleware. #### [extractReasoningMiddleware()](/docs/reference/ai-sdk-core/extract-reasoning-middleware) Extracts reasoning from the generated text and exposes it as a \`reasoning\` property on the result. #### [extractJsonMiddleware()](/docs/reference/ai-sdk-core/extract-json-middleware) Extracts JSON from text content by stripping markdown code fences. #### [isStepCount()](/docs/reference/ai-sdk-core/is-step-count) Creates a stop condition that triggers after a specified number of steps. #### [hasToolCall()](/docs/reference/ai-sdk-core/has-tool-call) Creates a stop condition that triggers when any specified tool is called. #### [isLoopFinished()](/docs/reference/ai-sdk-core/loop-finished) Creates a stop condition that lets the agent loop run until it naturally finishes. #### [simulateStreamingMiddleware()](/docs/reference/ai-sdk-core/simulate-streaming-middleware) Simulates streaming behavior with responses from non-streaming language models. #### [defaultSettingsMiddleware()](/docs/reference/ai-sdk-core/default-settings-middleware) Applies default settings to a language model. #### [defaultInstructionsMiddleware()](/docs/reference/ai-sdk-core/default-instructions-middleware) Applies default instructions to a language model. #### [smoothStream()](/docs/reference/ai-sdk-core/smooth-stream) Smooths text and reasoning streaming output. #### [generateId()](/docs/reference/ai-sdk-core/generate-id) Helper function for generating unique IDs #### [createIdGenerator()](/docs/reference/ai-sdk-core/create-id-generator) Creates an ID generator --- For a semantic overview of all documentation, see [/sitemap.md](/sitemap.md) For an index of all available documentation, see [/llms.txt](/llms.txt) For agent-facing discovery, including API and MCP surfaces, see [/agents.md](/agents.md)