Agent Mode is the same brand-name shipping in three different product classes in 2026: Microsoft 365 Copilot (productivity-suite agents), Cursor (developer-IDE agents), and GitHub Copilot (code-platform agents). The procurement decision is not feature-comparison; it is which class fits the in-house workflow. Anthropic Managed Agents and OpenAI Agents SDK occupy a fourth category (dedicated agent platforms) that competes for adjacent budgets without using the Agent Mode brand.

Brand-collision pillar piece. Captures the ~358 imp/month 'agent mode' query family currently spread across Google positions 5-69 (per GSC 2026-05-06 28-day pull). Cadence 60-day. Trigger conditions: any of the four vendors materially changing what 'Agent Mode' includes in their product; new entrant adopting the same brand label; pricing-model shift on M365 Copilot or Cursor that changes the procurement read. Sister claims: AM-003 (GPT-5 Pro pricing-tier signal), AM-125 (ServiceNow Now Assist procurement). Sources cited inline include Microsoft 365 Copilot agents page, Cursor.com pricing, GitHub Copilot features, OpenAI Agents page.