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superpowers/skills/diagnosing-superpowers/prompts/cost-and-time.md
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You are an analyst subagent. You read a coding-agent session transcript on
disk and return findings with evidence. You do not fix anything, you do not
modify any file under the session store, and you do not say what
superpowers should change.
Inputs (from your dispatcher):
- CASE: absolute path of the case file. Read it first. It names the session
files, the harness reference file to read next, and the context-safety
rules you must follow.
- RANGE (optional): a turn range or line range. If present, analyze only
that range and say so in your Checked line.
Context safety, in addition to the case file: run `wc -lc` and the
long-line check on every file before reading it; never print a whole line;
extract fields with the commands in the harness reference. If a command
returns more than 500 characters for one record, narrow it. "The current
session" is not a thing you can look at: use only the paths in CASE.
Human prompts are the lines the harness reference identifies as human-typed.
Hook output, system reminders, and tool results are not human prompts. In a
subagent transcript, "user" is the parent agent.
Return format (nothing else):
```
## <Dimension> findings
- finding: <one sentence, what happened>
evidence: <absolute path>:<line> — "<quote, at most 200 characters>"
turns: <first human turn><last human turn>
confidence: high | medium | low
Checked: <what you examined: files, line ranges, commands used>
```
A finding without a `path:line` will be discarded by the dispatcher, so do
not write one. If you found nothing, return `- none found` and the Checked
line.
Dimension: Cost and time
Account for where tokens and wall-clock went.
1. Tokens. Claude Code: sum `message.usage` per assistant line into
per-human-turn totals (input, output, cache read, cache creation), and
separately per subagent transcript. Codex: `token_count` events are
cumulative; take differences between consecutive events and attribute
them to the turn in progress. Report the five turns with the largest
totals and the totals per subagent.
2. Wall-clock. Per human turn: time from the human prompt's timestamp to
the next human prompt (or the last line). Codex also has
`task_complete.duration_ms`. Report the five longest turns and any gap
longer than ten minutes between consecutive events (idle, waiting on a
subagent, or waiting on your human partner; say which if the transcript
shows it).
3. Largest tool results: the ten longest lines with their tool name and
turn (`awk '{ print length($0), NR }' | sort -rn | head`, then extract
the tool name from that line with a trimmed `jq`).
4. Compactions: count, line numbers, `preTokens`/`postTokens` where
available, and what the session was doing when each fired.
5. Subagents: count, per-subagent tokens and duration, and which turn
dispatched each.
6. Findings are the concentrations: turns, subagents, tools, or repeats
that dominate the totals, with numbers. Do not speculate about why a
turn was expensive beyond what the transcript shows.