[Agents] Add changelog for Sandbox named tunnels

[whoiskatrin]

Summary

Adds a changelog entry for the @cloudflare/sandbox@0.11.0 release, focused on named tunnels — sandbox.tunnels.get(port, { name }) now binds a user-controlled hostname (<name>.<your-zone>) backed by a Cloudflare Tunnel and a proxied CNAME, giving a stable URL across container restarts and shared sandboxes. The entry also briefly notes the stale preview URL protection and Office Open XML binary handling changes from the same release.

Release reference: cloudflare/sandbox-sdk#729

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/changelog/	@cloudflare/pm-changelogs, @cloudflare/product-owners

[cloudflare-docs-bot]

Review

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---

✅ No style-guide issues found in commit 7d8d649.

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[ask-bonk]

Follow-up after the recent commits:

MEDIUM —
The title uses stable but the description and body use persistent (lines 3 and 13). Pick one term and use it consistently throughout the entry.

The import and usage are now correct — thanks for applying that fix.

[ask-bonk]

I reviewed PR #31131 and posted feedback on the PR.

What the PR changes
Adds a changelog entry under src/content/changelog/agents/ for the @cloudflare/sandbox@0.11.0 release. It documents the new named tunnels feature (sandbox.tunnels.get(port, { name })), which provides a stable, user-controlled hostname backed by a Cloudflare Tunnel. The entry also covers stale preview URL protection and improved Office Open XML binary handling.

Issues flagged

• MEDIUM — Package install command used a bare sh fence instead of the PackageManagers component. I posted inline suggestions to add the import and swap the code block. (This fix was already applied in a follow-up commit.)
• MEDIUM — Inconsistent terminology: the page title uses "stable", but the description and body text use "persistent". I posted a follow-up comment asking the author to pick one term and use it consistently throughout.

Labels
The PR already has appropriate labels: size/s and product:changelog. No additional labels were needed.

github run

[devin-ai-integration]

Devin Review found 2 potential issues.

View 2 additional findings in Devin Review.

[github-actions]

Preview URL: https://6536d2b8.preview.developers.cloudflare.com
Preview Branch URL: https://sandbox-named-tunnels-changelog.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/changelog/post/2026-05-29-sandbox-named-tunnels/	https://sandbox-named-tunnels-changelog.preview.developers.cloudflare.com/changelog/post/2026-05-29-sandbox-named-tunnels/