Describe the bug

Usage object contains number of requests but doesn't contain token amounts

Repro steps

const context = new RunContext();
const result = await run(agent, mutableHistory, { context });

console.log(context.usage)
Usage {requests: 3, inputTokens: 0, outputTokens: 0, totalTokens: 0, inputTokensDetails: Array(0), …}

Expected behavior

Usage contains the number of requests. Does not contain the token details