Engineering

Synthetic Data for Red Teaming AI Agents

James Liu||6 min
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Red teaming AI agents is hard. Real-world interactions are messy, sparse, and expensive to gather. You often want adversarial scenarios, edge cases, or rare failure modes, but getting enough labeled examples takes months. Synthetic data solves this by generating realistic interaction trajectories on demand.

Why synthetic paths matter for agent red teaming

Agents live in environments with multiple steps: browsing, clicking, filling forms, and handling errors. A single bad state can cascade. Synthetic data lets you replay those sequences thousands of times, each with different perturbations. For example, you can generate 10,000 sessions where a user provides inconsistent instructions, typos, or conflicting goals. That volume is impossible to collect manually.

Concrete numbers from current research

Studies on LLM-based agents show that synthetic trajectories can improve robustness scores by 15-30% over random prompts alone. In one benchmark comparing real and synthetic attack paths, synthetic data uncovered 40% more edge-case failures that real-world logs missed. The key is realism: if the synthetic steps look like genuine user behavior, the agent’s reactions are useful signals.

Key tradeoffs and design choices

  • Control over adversarial scenarios: generate rare or extreme cases that rarely occur in live logs.
  • Reproducibility: same seed produces identical sessions for regression testing.
  • Cost and quality balance: high-fidelity agents can be slow; simpler models speed up generation but may miss subtle behaviors.
  • Bias amplification risk: if the generator inherits bias, synthetic sessions can reinforce it.
  • Labeling overhead: creating ground-truth labels for synthetic paths still requires expert review.

Use synthetic scenarios to find failure patterns that live data hides, then use those patterns to harden your agent and safety policies.

How Coasty fits your red teaming workflow

Coasty runs computer use agents in real desktop and browser environments. This lets it capture realistic interaction data from actual workflows. The team can turn those observations into custom synthetic datasets and trajectories tailored to your specific agent, domain, and risk profile. Coasty’s synthetic data offering is custom and contact-led: you talk to the data team to define requirements, scope, and output formats. No fixed packages or self-serve dashboards, just a specific solution built around your use case.

If you want to scale your agent’s red teaming without waiting for rare real-world events, synthetic paths are a practical lever. Book a data call with the Coasty data team to discuss how they can generate realistic interaction data for your agents at https://cal.com/coasty/coasty-data-call .

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