tokenol 0.1.0

Audit Claude Code JSONL session logs: track cost, cache health, context blow-ups, and 5h-window pressure.

tokenol

Audit Claude Code JSONL session logs for cost, cache health, context blow-ups, and 5-hour rate-limit pressure.

tokenol parses the session transcripts that Claude Code writes to ~/.claude*/projects/**/*.jsonl and produces per-day, per-session, per-project, and per-model rollups — plus a live burn-rate view for the active 5-hour window.

Why tokenol

Claude Code bills you for everything the model reads — input, output, and cache creation/reads. When the prompt cache is working, 95%+ of your context tokens cost a tenth of full input price. When it isn't — idle gaps past the 5-minute TTL, context compaction, two sessions in the same repo thrashing each other — the same conversation can cost 10× more without looking any different.

tokenol tells you which sessions, projects, and hours did that, and usually why. You run it locally over the JSONL logs Claude Code already writes; nothing is uploaded anywhere.

Dashboard

Session drill-down — pattern detection + cost-per-turn small multiples:

Project page — cache efficiency trend, verdict distribution, top turns:

Install

pipx install tokenol

Requires Python 3.10+.

Quick start

# Daily token / cost aggregates over the last 14 days
tokenol daily

# Hourly breakdown for today
tokenol hourly

# Top 10 most expensive sessions in the last 30 days
tokenol sessions --since 30d --top 10 --sort cost

# Per-project rollup
tokenol projects

# Live view: burn rate + projected end-of-window cost
tokenol live --last 20m

All commands scan every JSONL file under $CLAUDE_CONFIG_DIR (falling back to the standard ~/.claude* locations) and deduplicate turns using the same message.id:requestId compound key that ccusage uses.

Scanning multiple projects

If you use workspace isolation (one ~/.claude-<project> directory per repo, pointed at via CLAUDE_CONFIG_DIR), tokenol by default only sees the currently-active project. Pass --all-projects (or -A) to any command to scan every ~/.claude* directory and get a cross-project view:

# Total spend across every project in the last 14 days
tokenol daily --since 14d --all-projects

# Which sessions cost the most, globally
tokenol sessions --since 30d --top 10 -A

You can also set CLAUDE_CONFIG_DIR to a colon- or comma-separated list of paths to scan a specific subset.

Commands

Command	What it shows
daily	Per-day tokens (input, output, cache read/creation), cost, turn count
hourly	Per-hour breakdown for a single day (defaults to today)
live	Active 5-hour window burn rate, recent-activity rate, projected final cost
sessions	Per-session detail table with blow-up verdict (RUNAWAY, CONTEXT_CREEP, …)
projects	Per-project rollup grouped by cwd
models	Per-model rollup with tool-use counts and error rates
verify	Cross-check tokenol totals against ccusage --json (if installed)
serve	Launch a local browser dashboard with live burn-rate gauge and all panels

Every command accepts:

• --since 14d — lookback window (e.g. 7d, 30d, or an ISO date)
• --all-projects / -A — scan every ~/.claude* directory (ignores CLAUDE_CONFIG_DIR)
• --strict — exit non-zero if any cost-computation assumption fired
• --show-assumptions — always print the assumption footer
• --log-level debug|info|warning

tokenol sessions additionally takes --sort (cost, input, output, cache_read, turns, max_input, duration) and --top.

tokenol live takes --last 20m|2h|30s and exits non-zero if the projected window cost exceeds the configured reference.

Live dashboard

# Install with dashboard dependencies
pipx install 'tokenol[serve]'

# Start the dashboard (binds to http://127.0.0.1:8787)
tokenol serve

# Cross-project view, faster tick, custom reference threshold
tokenol serve --all-projects --tick 2s --reference 25

# Open browser automatically
tokenol serve --open

The dashboard updates via SSE as Claude Code writes events to disk. Main page layout (top to bottom):

Panel	What it shows
Topbar	Today's cost · sessions · output · last-active time; global period selector (Today / 7D / 30D / All)
Efficiency tiles	Hit% · $/kW · Ctx · Cache reuse — each with a delta chip vs 7-day median and colour-coded threshold
Hour By Hour	Hourly metric timeline with day-picker, metric pills, project/model filters, and click-to-drilldown
Daily History	30-day metric history with 7-day moving average overlay; range pills (7D / 30D / 90D / All)
Models	Per-model cost, turns, output, and efficiency metrics; local range override; click row → /model/<name>
Recent Activity	Active projects in the last 60 min with Ctx used, $/kW, hit%, verdict; sortable; click row → /project/<cwd>

Keyboard shortcuts: ? Glossary · / Find · , Settings · Esc close/back · g t scroll to top · ↑↓ Enter table row navigation · ← → chart cursor.

Efficiency metric glossary

Metric	Definition	Target
Hit%	cache_read / (cache_read + cache_creation + input)	≥ 95%
$/kW	cost × 1000 / output_tokens — dollars per 1k output tokens	< $0.20
Ctx	cache_read / output as N:1 — context tokens read per output token	< 400:1
Cache reuse	cache_read / cache_creation as N:1 — low = cache thrashing	> 50:1
Ctx used	Latest turn's visible context ÷ model context window	< 85%

Preferences

User preferences (tick cadence and threshold overrides) are saved to:

$XDG_CONFIG_HOME/tokenol/prefs.json   # default: ~/.config/tokenol/prefs.json

Shape:

{
  "tick_seconds": 300,
  "reference_usd": 50.0,
  "thresholds": {
    "hit_rate_good_pct": 95,
    "hit_rate_red_pct": 85,
    "cost_per_kw_good": 0.20,
    "cost_per_kw_red": 0.40,
    "ctx_ratio_red": 400.0,
    "cache_reuse_good": 50.0,
    "cache_reuse_red": 20.0
  }
}

Reset to defaults via the Settings modal (POST /api/prefs {"thresholds": "reset"}).

Session drill-down

Click any session to open the drill-down page (/session/<id>). It shows:

• What likely went wrong — automated pattern cards at the top of the page, each with a headline, the measurable signal that triggered it, and a suggested fix. Five patterns are detected:

  Pattern	Signal
  Idle expiry	Gap ≥ 1 h between turns + next turn was ≥ 80% cache_creation — the 5-minute prompt-cache TTL expired
  Compaction re-inflation	Visible-token count dropped then climbed back to ≥ 80% of the previous peak — compacting but immediately refilling the context
  Context ceiling plateau	≥ 20 consecutive turns at ≥ 90% of the model's context window — paying near-full-context input rates throughout
  Sidechain explosion	Sidechain/task-agent work accounts for > 40% of session cost
  Tool error storm	> 20% error rate across any 10-turn window

• Cost per turn — stacked bar chart (input / output / cache_read / cache_creation). Toggle "All" or "Top 30" to focus on the most expensive turns. Click any bar to open the per-turn detail modal.

• Per-turn modal — cost component breakdown, token counts, tool call results (✓/✗), first 500 chars of the user prompt and assistant preview. Navigate with ← / → or close with Esc.

What it detects

For every session, tokenol computes a blow-up verdict against spec-defined thresholds:

Verdict (table label)	Trigger
RUNAWAY_WINDOW (runaway)	Any 5-hour window costs ≥ $50
CONTEXT_CREEP (ctx-creep)	Max single-turn input ≥ 500k and growth ≥ 2k/turn
TOOL_ERROR_STORM (tool-errs)	≥ 10 tool uses with > 30% error rate
SIDECHAIN_HEAVY (sidechain)	Sidechain session costing > $5
OK (ok)	Everything else

Daily efficiency columns

The tokenol daily report shows these cost/cache efficiency ratios:

Column	Meaning	Target
$/kW	USD per 1,000 output tokens	< $0.20
Ctx	Context tokens read per output token (N:1)	lower is better
Cache reuse	Cache reads per cache-creation token (N:1)	> 50:1
Hit%	% of context served from prompt cache	≥ 95%

Pricing

Flat per-model rates (no 1M-token tier surcharge — matches ccusage's default behaviour). The current registry lives in src/tokenol/metrics/cost.py. When a turn's model isn't in the registry, tokenol records an UNKNOWN_MODEL_FALLBACK assumption tag and uses a conservative default; run with --show-assumptions or --strict to surface these.

See docs/METRICS.md for metric definitions and docs/ASSUMPTIONS.md for the full list of assumption tags.

Development

git clone https://github.com/farhanferoz/tokenol
cd tokenol
uv sync --extra dev
uv run pytest
uv run ruff check

Licence

MIT