AnalysisTutorial / explainerAgents & Tool Use · Evaluation & Benchmarks · Applications1 source · Oct 22, 2026

How to Test AI Agents When No Benchmark Exists — Nathanael Weill, Air Canada

Nathanael Weill leads a team building AI agents at Air Canada, where tasks are so specific there's no public benchmark and domain experts have little time to grade results.

Proof1 independent outlet

Key points

  • His fix is to write the answer first: start from a known answer, generate the input from it, and check whether the agent finds its way back.
  • He shows how that took a past RAG project from one expert-graded test a week to dozens of automated tests a day, then applies it to a supplier-contract review agent with five ways to build a test set: past decisions, planted rule violations, removed clauses, changes that shouldn't matter, and contract templates with filled-in blanks.
  • 10:08 How the contract agent works
  • 18:07 Use expert feedback to build better tests

Sources (1)

  • [1]How to Test AI Agents When No Benchmark Exists — Nathanael Weill, Air Canada
    AI Engineer (YouTube) · Oct 22, 08:00 AM
    Nathanael Weill leads a team building AI agents at Air Canada, where tasks are so specific there's no public benchmark and domain experts have little time to grade results.
    His fix is to write the answer first: start from a known answer, generate the input from it, and check whether the agent finds its way back.

Extractive summary: sentences quoted from the sources.

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