Expert Research — L3

Expert research tier. Composes on top of L2 (/deep-research) by adding:

• Human-in-the-loop plan approval before expensive work
• Multi-perspective search (3 angles: proponents, critics, neutral)
• Fact-check pass — critical claims verified against 2+ independent sources
• Critic agent — adversarial review of the entire report
• 2 reflection loops (vs L2's 1)
• Structured decision matrix when the query implies a choice

Position in ladder: L3. Calls L2 as its foundation (which itself calls L1). Called by L4, L5.

When to Use