ultrathink

name	ultrathink
description	Deep reasoning mode — engage opus-class model for complex analysis requiring extended thinking
tags	["reasoning","analysis"]

When to Use

• User says "ultrathink" or needs deep reasoning on a complex problem
• Architectural decisions with multiple trade-offs
• Debugging issues where the cause is non-obvious
• Design decisions requiring careful analysis

Workflow

1. Perform deep analysis of the problem using opus-class reasoning (claude-opus-4.6). Consider all angles, trace through the code, identify trade-offs. @omg:architect can help with architectural depth.
2. If the problem is a bug: delegate to @omg:tracer for evidence-driven causal tracing
3. If the problem is a plan: delegate to @omg:critic for multi-perspective review
4. Present analysis with evidence and trade-offs

When to Combine

• ultrathink + deep-dive: for problems needing both deep reasoning AND requirements crystallization
• ultrathink + ralplan: for architectural decisions needing consensus

Trigger Keywords

ultrathink, deep reasoning, think deeply

Example

copilot -i "ultrathink: should we use microservices or monolith?"

Quality Contract

• Opus-class deep analysis with trade-offs