cost-conversation
Per-conversation cost view — list every session in cost-tracking with started-at, message count, top model, and total cost
What this skill does
# Cost per Conversation
`cost-report` and `cost-optimize` aggregate by **agent** and **model**. This skill aggregates by **conversation (session)** — a different lens that surfaces *which conversations cost the most*. Useful for retrospectives ("which sessions ran long on Opus?") and for evaluating whether a given project's session pattern is sustainable.
## When to use
- After multiple sessions, to see total spend per conversation.
- Before scoping a long session, to understand typical cost-per-conversation.
- For per-project rollups via `CONV_NAMESPACE=cost-tracking-<project>`.
## Steps
1. **Run the script** from anywhere:
```bash
node plugins/ruflo-cost-tracker/scripts/conversation.mjs
```
Optional env:
- `CONV_FORMAT=json` — emit JSON instead of markdown
- `CONV_LIMIT=20` — show only the most recent N conversations
- `CONV_NAMESPACE=cost-tracking` — override target namespace
2. **Inspect the markdown table** — total cost across all conversations, per-tier rollup, then a per-session table (started-at, sessionId prefix, message count, top model, cost).
## Cross-references
- `cost-track` — the producer that populates `cost-tracking:session-*`
- `cost-report` — same data, per-agent / per-model lens
- `cost-trend` — drift across bench runs (different axis: corpus runs vs conversations)
- `cost-budget-check` — sums across conversations to evaluate the budget threshold
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