Function traceTabs

packages/opencode/src/cli/cmd/run/stream.transport.ts:364–389

(trace: Trace | undefined, prev: FooterSubagentTab[], next: FooterSubagentTab[])

}

function traceTabs(trace: Trace | undefined, prev: FooterSubagentTab[], next: FooterSubagentTab[]) {
  const before = new Map(prev.map((item) => [item.sessionID, item]))
  const after = new Map(next.map((item) => [item.sessionID, item]))

  for (const [sessionID, tab] of after) {
    if (sameSubagentTab(before.get(sessionID), tab)) {
      continue
    }

    trace?.write("subagent.tab", {
      sessionID,
      tab,
    })
  }

  for (const sessionID of before.keys()) {
    if (after.has(sessionID)) {
      continue
    }

    trace?.write("subagent.tab", {
      sessionID,
      cleared: true,
    })
  }
}

function createLayer(input: StreamInput) {
  return Layer.fresh(