Léo Boisvert

Visiting Researcher

Agentic Harness & Defenses

Hi! I’m Léo. I am a visiting researcher at ServiceNow Research and am completing my master’s degree at Polytechnique Montréal under the direction of Quentin Cappart. For my master’s, I studied using GNNs in combinatorial optimization. Before returning to school for my master’s, I worked for two years as a data scientist in a mining technology company before becoming a manager and realizing I needed to return to the technical side of things!

Publications

Malice in Agentland: Down the Rabbit Hole of Backdoors in the AI Supply Chain. Léo Boisvert, Abhay Puri, Chandra Kiran Reddy Evuru, Nicolas Chapados, Quentin Cappart, Alexandre Lacoste, Nazanin Sepahvand, Krishnamurthy (Dj) Dvijotham, Alexandre Drouin. At ACM Conference on AI and Agentic Systems, 2026.

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DoomArena: A framework for Testing AI Agents Against Evolving Security Threats. Léo Boisvert, Mihir Bansal, Chandra Kiran Reddy Evuru, Gabriel Huang, Abhay Puri, Avinandan Bose, Maryam Fazel, Quentin Cappart, Jason Stanley, Alexandre Lacoste, Alexandre Drouin, Krishnamurthy (Dj) Dvijotham. At Conference on Language Modeling (COLM), 2025.

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DoomArena: A framework for Testing AI Agents Against Evolving Security Threats. Léo Boisvert, Abhay Puri, Gabriel Huang, Mihir Bansal, Chandra Kiran Reddy Evuru, Avinandan Bose, Quentin Cappart, Maryam Fazel, Alexandre Lacoste, Alexandre Drouin, Jason Stanley, Krishnamurthy (Dj) Dvijotham. At Workshop at the International Conference of Machine Learning (ICML), 2025.

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Silent Sabotage: Injecting Backdoors into AI Agents Through Fine-Tuning. Léo Boisvert, Abhay Puri, Chandra Kiran Reddy Evuru, Joshua Kazdan, Avinandan Bose, Quentin Cappart, Maryam Fazel, Sai Rajeswar Mudumba, Jason Stanley, Nicolas Chapados, Alexandre Drouin, Krishnamurthy (Dj) Dvijotham. At Workshop at the International Conference of Machine Learning (ICML), 2025.

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The BrowserGym Ecosystem for Web Agent Research. Thibault Le Sellier De Chezelles, Maxime Gasse, Alexandre Drouin, Massimo Caccia, Léo Boisvert, Megh Thakkar, Tom Marty, Rim Assouel, Sahar Omidi Shayegan, Siva Reddy, Quentin Cappart, Graham Neubig, Nicolas Chapados, Alexandre Lacoste. At Transactions on Machine Learning Research (TMLR), 2025.

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AgentMerge: Enhancing Generalization in Fine-Tuned LLM Agents. Megh Thakkar, Léo Boisvert, Thibault Le Sellier De Chezelles, Alexandre Piche, Maxime Gasse, Alexandre Lacoste, Massimo Caccia. At Workshop at the Neural Information Processing Systems (NeurIPS), 2024.

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Fine-Tuning Web Agents: It Works, But It's Trickier Than You Think. Massimo Caccia, Megh Thakkar, Léo Boisvert, Thibault Le Sellier De Chezelles, Alexandre Piche, Nicolas Chapados, Alexandre Drouin, Maxime Gasse, Alexandre Lacoste. At Workshop at the Neural Information Processing Systems (NeurIPS), 2024.

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WorkArena++: Towards Compositional Planning and Reasoning-based Common Knowledge Work Tasks. Léo Boisvert, Megh Thakkar, Maxime Gasse, Massimo Caccia, Thibault Le Sellier De Chezelles, Quentin Cappart, Nicolas Chapados, Alexandre Lacoste, Alexandre Drouin. At NeurIPS Datasets and Benchmarks Track (NeurIPS Datasets), 2024.

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An Ecosystem for Web Agents: WorkArena, BrowserGym, AgentLab and more. Alexandre Lacoste, Maxime Gasse, Thibault Le Sellier De Chezelles, Massimo Caccia, Léo Boisvert, Megh Thakkar, Alexandre Drouin, Nicolas Chapados. At Montreal AI Symposium (MAIS), 2024.

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WorkArena: How Capable are Web Agents at Solving Common Knowledge Work Tasks?. Alexandre Drouin, Maxime Gasse, Massimo Caccia, Issam H. Laradji, Manuel Del Verme, Tom Marty, Léo Boisvert, Megh Thakkar, Quentin Cappart, David Vazquez, Nicolas Chapados, Alexandre Lacoste. At International Conference on Machine Learning (ICML), 2024.

Paper Cite Code Video