Local dev gets observability traces; workerd crashes now auto-recover

Minor Changes

• #14633 3203b5d Thanks @nickpatt! - Add local-dev observability

  wrangler dev and the Vite plugin now capture a trace for every local Worker invocation - spans, logs, and console.* output, including requests that cross worker or Durable Object boundaries.

  You can explore this data two ways:

  • A new Observability tab in the Local Explorer, with a Traces view (recent invocations, an inline timeline waterfall, and filters) and an Events view.
  • A read-only SQL endpoint at /cdn-cgi/explorer/api/local/observability/query, discoverable via the Local Explorer's OpenAPI document, so coding agents and tools can query the same spans and logs tables.

  While this is in testing it's off by default; set X_LOCAL_OBSERVABILITY=true to turn it on. It will be on by default in the public release.

Patch Changes

• #14796 c38a2c3 Thanks @dependabot! - Update dependencies of "miniflare", "wrangler"

  The following dependency versions have been updated:

  Dependency	From	To
  @cloudflare/workers-types	^5.20260721.1	^5.20260722.1
  workerd	1.20260721.1	1.20260722.1

• #14772 c079ba3 Thanks @chinesepowered! - Fix incorrect byte limit reported in the local Queues batch-size error

  When a queue batch exceeded the maximum batch byte size in local dev, the thrown PayloadTooLargeError hardcoded the limit as 256000, even though the value actually enforced is 288000 bytes ((256 + 32) * 1000). The message now interpolates the real limit, consistent with the other Queue limit errors in the same file.

• #14493 95b026e Thanks @petebacondarwin! - Update sharp to 0.35.2

  sharp 0.35 removes its install lifecycle script, so package managers that block dependency build scripts by default (such as pnpm 11+) no longer require an explicit build approval for it when installing miniflare/wrangler. The local Images binding keeps using the same prebuilt sharp binaries, so image transforms in local dev are unaffected.

  This release also reworked sharp's FormatEnum types: libvips reports AVIF inputs under the heif container. The local Images binding /info endpoint and the cf.image transform path now correctly report AVIF as image/avif instead of treating it as an unsupported/unknown type.

• #14792 c4bacec Thanks @matthewp! - Recover local development after the Workers runtime crashes

  Previously, an unexpected workerd crash left Miniflare running but unable to serve subsequent requests. Miniflare now restarts workerd after post-startup crashes, while continuing to surface startup crashes as fatal errors.

  The Cloudflare Vite plugin also restarts the Vite development server after workerd recovers so its environments, hot channels, and module runners are recreated.