Microsoft launches Legal Agent in Word, targeting contract review work
Microsoft released a Legal Agent in Word on April 30, designed to automate contract review and redline tasks for legal professionals. The tool runs natively in Word on Windows desktop through the Frontier program in the US.
The product differs from general-purpose AI assistants. Microsoft built it with input from legal engineers, including some from the defunct legal tech company Robin AI, to reflect how contracts are actually reviewed and negotiated.
How it works
The Legal Agent analyzes full agreements, identifies specific clauses, and compares document versions to spot risks and obligations. It generates redlines with tracked changes and can review contracts against a firm's internal playbook to flag non-conforming language.
The tool applies edits through a purpose-built algorithm rather than relying solely on large language models to generate revisions. This approach is meant to improve consistency and reduce processing time and cost.
The agent preserves document formatting, lists, tables, and tracked changes. It separates prior revisions from new proposals during negotiation, maintaining a clear history of changes.
Control and transparency
Each suggestion includes citations linked directly to source language, allowing reviewers to verify responses. Users can review and approve edits before they apply, and the agent inserts comments explaining changes.
The Legal Agent runs within Microsoft 365 security and governance controls. Microsoft said early customers value the tool's domain expertise in working with tracked changes and internal playbooks while maintaining full control over documents.
Microsoft cautioned that the Legal Agent does not provide legal advice and may produce inaccurate content. Users remain responsible for reviewing and verifying all output.
Market context
This launch follows Anthropic's Claude Word plugin and comes as two major technology companies now actively target legal work. Unlike Microsoft Copilot, a general-purpose tool, the Legal Agent was built from the ground up as a specialized product for legal workflows.
The move reflects broader competition in AI for legal work. With 99 percent of legal work occurring in Word, a native tool from Word's creator carries different weight than third-party plugins.
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