Content block to represent an invalid tool call

Represents a request to call a tool.

Content block to represent partial data of a tool call

Annotation for citing data from a document.

Provider-specific content block.

Reasoning output from a LLM.

Text output from a LLM.

Represents an action with a name and arguments.

Represents an action request with a name, arguments, and description.

Base middleware interface.

Type bag that encapsulates all agent type parameters.

Response when a human approves the action.

Configuration for clearing tool outputs when token limits are exceeded.

LangChain Messages

Protocol describing a context editing strategy.

Configuration for the Context Editing Middleware.

Default type configuration for agents.

LangChain Documents

Response when a human edits the action.

Information about a tool call that has been executed.

Request for human feedback on a sequence of actions requested by a model.

Response payload for a HITLRequest.

Represents information about an interrupt.

Type bag that encapsulates all middleware type parameters.

Configuration for modifying a model call at runtime.

Options for configuring the OpenAI Moderation middleware.

Represents a detected PII match in content

ReactAgent is a production-ready ReAct (Reasoning + Acting) agent that combines

Configuration for a redaction rule

Response when a human rejects the action.

Resolved redaction rule with a concrete detector function

Policy for reviewing a HITL request.

Information about a tool call that has been executed.

Represents a tool call request for the wrapToolCall hook.

Options for configuring the Tool Emulator middleware.

Information about a tool result from a tool execution.

Branded type for ToolStrategy arrays that preserves type information

Interface for objects that can be serialized.

Content block for audio data

Content block for multimodal data

Content block for file data

Content block for image data

Content block for plain text data

Content block for video data

Hook type for the afterAgent lifecycle event.

Hook type for the afterModel lifecycle event.

Hook type for the beforeAgent lifecycle event.

Hook type for the beforeModel lifecycle event.

Built-in PII types

Helper type to combine agent tools with middleware tools into a single readonly array.

Union of all possible decision types.

Default type configuration for middleware.

Function type that dynamically generates a description for a tool call approval request.

Type helper to extract union type from an array of Zod schemas

Helper type to infer the full merged context from an agent, including:

Shorthand helper to extract the raw Context schema type from an AgentTypeConfig or ReactAgent.

Shorthand helper to extract the Middleware type from an AgentTypeConfig or ReactAgent.

Shorthand helper to extract the Response type from an AgentTypeConfig or ReactAgent.

Helper type to infer the full merged state from an agent, including:

Shorthand helper to extract the raw State schema type from an AgentTypeConfig or ReactAgent.

Shorthand helper to extract the Tools type from an AgentTypeConfig or ReactAgent.

Helper type to extract any property from an AgentTypeConfig or ReactAgent.

Helper type to extract input type from context schema (with optional defaults)

Helper type to infer merged input state from an array of middleware (includes built-in state)

Helper type to infer merged state from an array of middleware (includes built-in state)

Helper type to infer the context schema type from a middleware

Helper type to infer the input context schema type from a middleware (with optional defaults)

Helper type to infer merged input context from an array of middleware (with optional defaults)

Helper type to infer merged context from an array of middleware

Shorthand helper to extract the ContextSchema type from a MiddlewareTypeConfig or AgentMiddleware.

Shorthand helper to extract the FullContext type from a MiddlewareTypeConfig or AgentMiddleware.

Helper type to infer the input state schema type from a middleware (all properties optional)

Helper type to infer merged input state from an array of middleware (with optional defaults)

Shorthand helper to extract the Schema type from a MiddlewareTypeConfig or AgentMiddleware.

Helper type to infer the state schema type from a middleware

Helper type to infer merged state from an array of middleware (just the middleware states)

Helper type to infer tools from a single middleware instance.

Helper type to infer and merge tools from an array of middleware.

Shorthand helper to extract the Tools type from a MiddlewareTypeConfig or AgentMiddleware.

Helper type to extract any property from a MiddlewareTypeConfig or AgentMiddleware.

jump targets (internal)

Result type for middleware functions.

Custom detector function that takes content and returns matches

Strategy for handling detected PII

Helper type to resolve an AgentTypeConfig from either:

Helper type to resolve a MiddlewareTypeConfig from either:

Special type to indicate that no response format is provided.

Runtime information available to middleware (readonly).

Handler function type for wrapping tool calls.

Runtime context automatically injected into tools.

Helper type to convert an array of tools (ClientTool | ServerTool)[] to a MessageToolSet.

Base input type for .invoke and .stream methods.

Handler function type for wrapping model calls.

Wrapper function type for the wrapModelCall hook.

Wrapper function type for the wrapToolCall hook.