Your agent's cheap model just confidently produced a wrong number — and nothing errored.

Plumbline checks every step against reality — it runs the test, it does the arithmetic — not another AI's opinion. It catches the silently-wrong step, pinpoints it, and fixes only that step: retry the cheap model with the reason, then escalate to a stronger model on another provider. You keep your model. You keep your price. You stop shipping wrong answers.

👇 A cheap agent runs 7 steps. Watch the left ship a wrong wire — and Plumbline catch it.

● Cheap model alone

one cheap model, no safety net — what most agents do today

● Cheap model + Plumbline

same cheap model — Plumbline verifies each step against reality and recovers the failures

How you connect — one line, keep your own key

# You pick your model. Plumbline verifies it. Any provider.
client = OpenAI(
    base_url="http://localhost:8129/v1",   # <- the only change (runs today)
    api_key=YOUR_KEY,                       # your key, passes through
)

Not a router. Routers pick a model up front and lock it. Plumbline keeps the model YOU chose, checks each step against reality, and escalates only the failures — across providers a single lab won't reach.