# Workers, Durable Objects - Workers traces now automatically include JavaScript RPC session spans

Publisher-attributed story with a reviewed brief or permitted publisher paragraph. The original publisher is responsible for the linked reporting.

- Publisher: Cloudflare Developers
- Category: Cloud
- Original publication time: 2026-09-17T00:00:00Z
- First observed by NexusTechWire: 2026-10-01T15:54:33Z
- Original source: https://developers.cloudflare.com/changelog/post/2026-09-17-javascript-rpc-session-spans/
- NexusTechWire record: https://nexustechwire.com/news/news-88ad7eba6b31472ad974

## From the publisher

Workers traces can now follow JavaScript RPC calls across Worker boundaries and into Durable Objects. Previously, a trace stopped at the caller's RPC boundary. The dashboard now shows the caller-side session and method calls alongside the callee invocation, nested calls, and callbacks into another Worker. A session span covers the lifetime of a caller-side session and groups calls that reuse it. Individual call spans show each method invocation. Execution colors distinguish the Workers or Durable Object entrypoints involved, while arrows mark outgoing and incoming calls. Together, these details show where time was spent, which calls reused a session, and how returned stubs and callbacks fit into the request.

Source license: [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/). Publisher excerpt shortened and converted to plain text. Original source license applies.

Read the full original: [Cloudflare Developers](https://developers.cloudflare.com/changelog/post/2026-09-17-javascript-rpc-session-spans/)

This record does not reproduce the complete article or represent independent confirmation of every source claim.