Field Notes: AI — February 2026

The month in one paragraph

February 2026 was the mainstreaming month for agent workflows. GitHub Copilot CLI reached GA with specialized agents and broader delegation patterns, while Cursor shipped plugins, sandbox access controls, async subagents, and public sandboxing guidance. Once that happened, competitive advantage shifted to boundary design: what agents can touch, when they can run, and how safely they can run in the background.

Industry leader watch

• Copilot ecosystem: GA momentum made CLI agent workflows a realistic default in many teams.
• Cursor ecosystem: plugin + sandbox + async-subagent investments signaled platform-level confidence in long-running agent tasks.
• Model providers: continued to matter, but tool-operability and safety controls increasingly drove adoption.

Tooling and workflow trends

• Background delegation: agents moved from synchronous helper to queued worker model.
• Plugin surfaces: teams expanded capability through controlled extension points.
• Security boundaries: sandbox policy and scoped access became first-order architecture decisions.

Dev-tool pulse

• GitHub Copilot CLI GA: specialized agents and stronger cloud/background execution patterns.
• Cursor releases: plugins, sandbox controls, async subagents, and clearer security posture communication.

Operator math (TeX)

$$T_{\text{task}} = T_{\text{queue}} + T_{\text{agent-run}} + T_{\text{human-review}}$$