#agent harness

3 related articles

Oct 24, 2026·2 min

Same Model, 22-Point Score Gap: Agent Harness Is the Key Variable

Same model, different harness: Terminal-Bench 2.0 scores differ by 22 points—Opus 4.6 from 60.45% to 82.02%, GPT-5.5 from 66.07% to 88.09%. A look at agent harness architecture, SDKs, and a minimal Python loop.

Oct 23, 2026·4 min

Is the Agent Harness Dead? Cursor's Early Engineer Breaks Down the Real Architecture of AI Coding Agents

Cursor early engineer Jediah breaks down the real architecture of the agent harness: why "the harness is dead" is only half right, how the data flywheel lets the harness obsolete itself, and how Grokbot, software factories, and primitive design open new frontiers for agents.

Oct 21, 2026·3 min

Is the Agent Harness Dead? A Cursor Engineer's Deep Dive

Cursor engineer Jediah Katz rebuts the "agent harness is dead" claim: the intelligence-patching part is absorbed by models, but new harnesses for infrastructure, trust, and efficiency are just beginning.