Vercel Agent Runs adds Eve subagent tracing

Observability is the single biggest bottleneck in productionizing agentic workflows, and Vercel integrating deep multi-agent tracing directly into its platform is a major step toward making agent debugging as seamless as standard web request tracing.

• –Zero-Config Tracing: Because Eve relies on durable execution, Vercel can automatically map hierarchical agent-to-subagent dependencies without requiring developers to write complex telemetry boilerplate.
• –Developer Debugging Loop: A dedicated Developer Mode within the dashboard lets builders inspect raw JSON inputs and outputs passed between agents and subagents, greatly simplifying data-flow debugging.
• –Granular Cost Controls: Including turn-level token and cost metrics helps teams identify exactly which subagents are consuming the most resources and optimize prompting strategies accordingly.