wattage

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A token-spend profiler and cost-regression gate for AI agents.

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**A Kill-A-Watt meter for your AI agents.** Point it at a trace and it tells
you exactly where your tokens are being burned and wasted, prices each waste
pattern in real dollars, prescribes a fix, and can fail your CI when a change
makes your agent measurably more expensive.

![wattage report demo](https://raw.githubusercontent.com/faizannraza/wattage/main/docs/assets/demo.gif)

*A real captured agent trace (see [provenance](benchmarks/traces/README.md)) —
Wattage catches a stable prompt prefix being re-sent instead of cached, prices
the waste, and prescribes the fix. Regenerate this GIF with
`vhs docs/assets/demo.tape` (see the tape file for the exact command).*

## Install and run

```bash
uvx wattage report trace.json
```

No config file, no API key, fully offline — point it at an [OTLP JSON](https://opentelemetry.io/docs/specs/otlp/)
trace export and it prices every call and runs every detector. Don't have a
trace yet? [Getting your first trace](docs/getting-started.md) covers both
"I already have OTel traces" and "I have zero instrumentation" (a runnable,
5-minute path from nothing to a real, priced report). Or try it right now
against the fixture shipped in this repo:

```bash
git clone https://github.com/faizannraza/wattage
cd wattage && uv sync
uv run wattage report examples/sample_trace.json
```

```
╭──── ⚡ wattage — examples/sample_trace.json ────╮
│ Token Efficiency: A (100)   Total cost: $0.0602 │
│ quality: unmeasured                             │
╰─────────────────────────────────────────────────╯
      Token breakdown
┏━━━━━━━━━━━━━━━━┳━━━━━━━━┓
┃ Category       ┃ Tokens ┃
┡━━━━━━━━━━━━━━━━╇━━━━━━━━┩
│ input          │  18450 │
│ output         │    320 │
│ cache_read     │      0 │
│ cache_creation │      0 │
│ reasoning      │      0 │
└────────────────┴────────┘
No findings — this trace looks efficient.
pricing: 2026-07-18-verified
```

Or get a self-contained, shareable HTML flame graph instead of the terminal
view:

```bash
uv run wattage report examples/sample_trace.json --html report.html
```

## The evidence, not a marketing claim

Wattage's standout feature is the **convergence engine** — the
`nonconvergence` detector, which catches an agent thrashing through a loop
without making real progress, including patterns a naive exact-match
duplicate detector structurally cannot see (a retry with a fresh timestamp
each time, an oscillation between two strategies, a "productive-looking"
stall where every call is technically unique but nothing is actually
learned).

Rather than assert that, we built a hand-reviewed set of 10 labeled
synthetic loops and benchmarked Wattage's classifier against a real
SHA-256 exact-match baseline implementation:

| Classifier | Precision | Recall | F1 |
|---|---|---|---|
| **Wattage** | 1.00 | 1.00 | **1.00** |
| SHA-256 exact-match | 1.00 | 0.14 | 0.25 |

Reproduce it yourself — no cherry-picking, no hidden setup:

```bash
uv run python -m benchmarks.harness
```

And on a genuine captured agent trace (not synthetic — see
[`benchmarks/traces/README.md`](benchmarks/traces/README.md) for provenance),
Wattage's `prefix_churn` fix simulation shows a **44.7% cost reduction**
(`$0.000199 → $0.000110`) from enabling prompt caching on the stable prefix —
small dollar figures because it's a 3-turn demo trace, but the mechanism is
identical at production scale. Run it against your own traces for numbers
that matter:

```bash
uv run python -c "from benchmarks.frontier import build_frontier; print(build_frontier())"
```

Full methodology: [The Convergence Engine](docs/convergence.md).

## The badge

```bash
uv run wattage badge trace.json --out wattage-badge.svg
```

```markdown
![Wattage](https://raw.githubusercontent.com/faizannraza/wattage/main/wattage-badge.svg)
```

Wire `--badge-out` into your CI job (see below) so it regenerates on every
merge to your default branch, and the badge in your README stays live.

## How it works

Three surfaces, one normalized data model underneath
(`sessions → tasks → loops → iterations → calls`), built from
[OpenTelemetry GenAI semantic-convention](https://opentelemetry.io/docs/specs/semconv/gen-ai/)
traces:

- **`wattage report`** — ingests a trace, prices every call against a
  vendored, dated pricing snapshot, and runs eight detectors:

| Detector | Catches |
  |---|---|
  | `prefix_churn` | Stable context re-sent instead of cached |
  | `cache_gap` | Caching attempted but under-redeemed by later reads |
  | `verbosity` | Output far beyond what the step needed |
  | `redundant_tool_calls` | The same tool call repeated (exact or fuzzy) |
  | `nonconvergence` | Loops that thrash, oscillate, or stall without progress |
  | `retrieval_thrash` | Repeated retrieval that never yields relevant results |
  | `model_mismatch` | A pricier model doing work a cheaper one could handle |
  | `reasoning_overspend` | Heavy reasoning-token spend on a simple step |

Every finding is priced in real dollars, includes a concrete fix, and is
  tagged with a `quality_risk` tier (`none` / `low` / `review`) — a fix that
  could plausibly change output quality (a model downgrade, less reasoning)
  only counts toward your score once a `--quality` map backs it with real
  evidence. Full detail: [Detectors](docs/detectors/index.md).

- **`wattage score` / `wattage badge`** — a single 0–100 Token Efficiency
  grade for a README badge or a CI gate.

- **`wattage ci`** — the cost-regression gate (below).

Wattage never fabricates a number: an unpriced model leaves that call's cost
at zero (and fails `wattage ci` loudly, exit code 4) rather than guessing;
an unmeasured quality signal is reported as `unmeasured`, not assumed fine.

## CI integration

```yaml
# .github/workflows/wattage.yml
name: Wattage
on:
  pull_request:
    paths: ["agents/**", "prompts/**", "src/**"]
concurrency:
  group: wattage-${{ github.ref }}
  cancel-in-progress: true
jobs:
  token-efficiency:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Generate trace fixture
        run: python scripts/run_agent_fixture.py > trace.json
      - name: Wattage cost-regression gate
        uses: faizannraza/wattage/action@v0.1.0
        with:
          source: trace.json
          baseline: .wattage/baseline.json
          fail-on: "score_below:80,cost_delta_pct_above:5,any_critical:true"
          pr-comment: "true"
```

Fails the build (exit code 1) when your agent regresses past the threshold
you set, posts a per-detector delta table as a PR comment, and emits SARIF
(shows up in GitHub's Security tab) and JUnit XML for any other CI system.
The baseline is a small committed JSON file — noise-floor protection is
structural, not statistical: it only ever updates on a run that actually
passed the gate.

**This is only half the setup.** A PR job runs on a throwaway checkout, so
it can't be the thing that updates `.wattage/baseline.json` on disk — that
update needs a second workflow, triggered on push to your default branch,
that commits the refreshed baseline (and badge) back after each merge.
Skipping it means every PR compares against the same stale baseline
forever. Full reference, with both workflows: [CI Integration](docs/ci.md).

## Contributing

Detectors are discovered through a Python entry-point group, so adding one
doesn't require touching this repo's core pipeline — see
[CONTRIBUTING.md](CONTRIBUTING.md) for the full "write a detector" walkthrough,
using [`cache_gap`](src/wattage/detectors/cache_gap.py) as the reference
example.

## License

[Apache-2.0](LICENSE)

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