Problem

When building activity tracking/dashboards, there's no way to get actual token usage per task. The session_status tool shows per-turn tokens (e.g., "8 in / 56 out") but not cumulative session totals.

Proposed Solution

Add cumulative token fields to session_status output:

🧮 Tokens: 8 in / 56 out (this turn)
📊 Session: 45,230 in / 32,100 out (cumulative)
💰 Cost: $1.23 (session total)

Or expose via a separate tool/API:

session_tokens -> {inputTokens: 45230, outputTokens: 32100, costUsd: 1.23}

Use Case

Tracking token usage per task for:

• Activity feed dashboards showing cost per action
• Budget monitoring
• Efficiency analysis

Current Workaround

Tracking context size deltas as a rough proxy, but this is imprecise.

Additional Context

Would enable accurate cost attribution to specific tasks/activities rather than just session-level totals.