Heavy Think

One entry point for heavy thinking, with several modes. Most run parallel agents and then your synthesis: change what the agents explore, and the same engine gives a different kind of thinking.

Harness. This skill names capabilities (spawn a sub-agent, a live team, a model tier such as strong), not one harness's tools. references/harness.md maps each to Claude Code, opencode and omp, and gives the fallback when your harness lacks one.

Teammates vs subagents. Use a live team when the agents need to talk to each other: debate, collaborative brainstorm, hand-offs. Use parallel sub-agents when they don't. Teammates compound through live cross-talk but cost more, and only some harnesses have them (Claude Code agent teams, main session only); sub-agents are cheaper and collide only once, in your synthesis.

Dispatch

Classify the problem, then pick the mode. The agent modes are worth their cost only on a problem a plain answer would get wrong or thin: if you can answer it well in 30 seconds, answer it.