Your agent can now debug Workers with local tracing

Starting today, wrangler dev and vite dev automatically capture OpenTelemetry traces for local Worker invocations. When Cloudflare's tooling detects an agent session, it points the agent to the Local Explorer API, a local debugging API where it can query those traces. You do not need to install an SDK, enable tracing, configure your agent, or even mention observability in the prompt.

A prompt can be as simple as:

This builds on years of investment in local development, from introducing Miniflare to making local mode the default in Wrangler 3. Local traces give coding agents structured feedback from that development environment before code is deployed.

Agents discover the Local Explorer API automatically

As part of its normal workflow, an agent starts wrangler dev or vite dev to run and test the Worker. When the development server recognizes a supported coding-agent session, it automatically prints a hint that looks like this:

The Local Explorer is a browser-based interface and REST API for viewing and editing local resource data and querying observability data during development. The API root serves an OpenAPI schema, so agents can discover available endpoints at runtime without hardcoded instructions.

The automatically captured traces are available through a read-only Continue reading