Function buildSessionSummary

src/parser.ts:1272–1404

(
  sessionId: string,
  project: string,
  turns: ClassifiedTurn[],
  mcpInventory?: string[],
)

}

function buildSessionSummary(
  sessionId: string,
  project: string,
  turns: ClassifiedTurn[],
  mcpInventory?: string[],
): SessionSummary {
  const modelBreakdown: SessionSummary['modelBreakdown'] = Object.create(null)
  const toolBreakdown: SessionSummary['toolBreakdown'] = Object.create(null)
  const mcpBreakdown: SessionSummary['mcpBreakdown'] = Object.create(null)
  const bashBreakdown: SessionSummary['bashBreakdown'] = Object.create(null)
  const categoryBreakdown: SessionSummary['categoryBreakdown'] = Object.create(null)
  const skillBreakdown: SessionSummary['skillBreakdown'] = Object.create(null)
  const subagentBreakdown: SessionSummary['subagentBreakdown'] = Object.create(null)

  let totalCost = 0
  let totalSavings = 0
  let totalInput = 0
  let totalOutput = 0
  let totalReasoning = 0
  let totalCacheRead = 0
  let totalCacheWrite = 0
  let apiCalls = 0
  let firstTs = ''
  let lastTs = ''

  for (const turn of turns) {
    const turnCost = turn.assistantCalls.reduce((s, c) => s + c.costUSD, 0)
    const turnSavings = turn.assistantCalls.reduce((s, c) => s + (c.savingsUSD ?? 0), 0)

    if (!categoryBreakdown[turn.category]) {
      categoryBreakdown[turn.category] = { turns: 0, costUSD: 0, savingsUSD: 0, retries: 0, editTurns: 0, oneShotTurns: 0 }
    }
    categoryBreakdown[turn.category].turns++
    categoryBreakdown[turn.category].costUSD += turnCost
    categoryBreakdown[turn.category].savingsUSD += turnSavings
    if (turn.hasEdits) {
      categoryBreakdown[turn.category].editTurns++
      categoryBreakdown[turn.category].retries += turn.retries
      if (turn.retries === 0) categoryBreakdown[turn.category].oneShotTurns++
    }

    if (turn.subCategory) {
      const skillKey = turn.subCategory
      if (!skillBreakdown[skillKey]) {
        skillBreakdown[skillKey] = { turns: 0, costUSD: 0, savingsUSD: 0, editTurns: 0, oneShotTurns: 0 }
      }
      skillBreakdown[skillKey].turns++
      skillBreakdown[skillKey].costUSD += turnCost
      skillBreakdown[skillKey].savingsUSD += turnSavings
      if (turn.hasEdits) {
        skillBreakdown[skillKey].editTurns++
        if (turn.retries === 0) skillBreakdown[skillKey].oneShotTurns++
      }
    }

    for (const call of turn.assistantCalls) {
      const callSavings = call.savingsUSD ?? 0
      totalCost += call.costUSD