Function●Since v1.1

countTokensApproximately

Default token counter that approximates based on character count.

If tools are provided, the token count also includes stringified tool schemas.

countTokensApproximately(
  messages: BaseMessage<MessageStructure<MessageToolSet>, MessageType>[],
  tools: Record<string, any>[] | null
): number

Parameters

Name	Type	Description
`messages`*	`BaseMessage<MessageStructure<MessageToolSet>, MessageType>[]`	Messages to count tokens for
`tools`	`Record<string, any>[] \| null`	Optional list of tools to include in the token count. Each tool can be either a LangChain tool instance or a dict representing a tool schema. LangChain tool instances are converted to OpenAI tool format before counting.