Harvey AI's Word Add-In now supports custom agents, streamlining legal document reviews directly in Microsoft Word.

Harvey AI has launched a major update to its Microsoft Word Add-In, enabling legal teams to run their custom AI agents directly within Word documents. This new functionality, announced on September 23, 2026, allows users to deploy tailored agents for tasks like contract reviews, redlining, and summarization without switching platforms.

These custom agents are built using Harvey’s Agent Builder tool, which lets teams encode their preferred legal standards, positions, and workflows. With the latest integration, these agents now operate seamlessly on open Word documents, using the document's content as context and pulling in additional files from Harvey's Vault if needed. For instance, a master services agreement (MSA) review agent can identify deviations in terms like liability caps or data protection clauses, returning standardized feedback in a team-specific format.

This update builds on Harvey's broader strategy of embedding AI into the Microsoft 365 ecosystem. Harvey’s Word Add-In already includes features like Playbooks for repeatable workflows, document redaction, and real-time drafting and editing. By introducing custom agents into Word, Harvey eliminates the need for lawyers to toggle between applications, a step that could save significant time and reduce errors in legal reviews.

Notably, suggestions made by the agents are presented as tracked changes in Word, preserving transparency and allowing users to accept, modify, or reject edits. Multiple review sessions are supported through Harvey’s threaded chat feature, ensuring continuity for complex or ongoing projects.

This release is part of Harvey’s ongoing collaboration with Microsoft, which was expanded in July 2026.

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