What trace tools would be most useful?

[tamish560]

We currently have trace.history, trace.stats, trace.search, and trace.replay. What other trace tools would help you debug or understand your agent's behavior?

Some ideas we're considering:

• trace.diff (compare two calls side by side)
• trace.timeline (visual timeline of all calls in a session)
• trace.cost (token cost breakdown per tool)
• trace.errors (list all failed calls)

What would you use?