Five articles built the runtime. The sixth made it observable. This one introduces the agent primitive: runAgent plus AgentScope, with budgets, replayable events, and structured cancellation in the box.

The whole loop:

import { runAgent, AgentToolCalls, OpenAITokens } from "@workit/core/ai";

import { CostBudget, run } from "@workit/core";

const { result, events } = await runAgent(async (agent, ctx) => {