[Precursor] Updating Changelog for Precursor - release 6 July

[marinaelmore]

Summary

Adding changelog for Precursor.

Screenshots (optional)

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.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[cloudflare-docs-bot]

Review

⚠️ 5 warnings, 💡 4 suggestions found in full PR diff.

Code Review

This code review is in beta and may not always be helpful — use your judgment.

Warnings (2)

File	Issue
changelog/cloudflare-challenges/2026-06-30-precursor-session-based-detection.mdx line 9	Placeholder URL in published content — The announcement blog link uses https://blog.cloudflare.com/placeholder-precursor-announcement/, which is a placeholder URL that will 404 when published. Fix: Replace the placeholder with the real announcement blog URL before releasing this changelog.
cloudflare-challenges/challenge-types/challenge-pages/index.mdx line 8	Duplicate sidebar order — Both challenge-pages/index.mdx and challenge-pages/create-custom-rule.mdx set sidebar.order: 2, so the two sibling pages can render in an unstable/ambiguous order. Fix: Use a unique sidebar.order for the overview, e.g. 1, and adjust the other page if needed.

Conventions

Checks PR title, description, and redirect checklist.

_{No convention issues found.}

Style Guide Review

Warnings (3)

File	Issue
cloudflare-challenges/precursor.mdx line 17	Bulleted list used for sequential steps — Line 17 starts a bulleted list describing the Precursor verification loop steps Fix: Use a numbered list for sequential steps
cloudflare-challenges/precursor.mdx line 27	Use turn on / turn off for toggles — Line adds 'Enable Precursor for your zone:' Fix: Change to 'Turn on Precursor for your zone:'
cloudflare-challenges/precursor.mdx line 60	Use turn on / turn off for toggles — Line adds 'Rules do not enable or disable Precursor' Fix: Change to 'Rules do not turn Precursor on or off'

Suggestions (4)

File	Issue
cloudflare-challenges/precursor.mdx line 64	Bullet list has fewer than three items — Line 64 begins a two-item bullet list of example rules Fix: Consider writing the two examples as prose
cloudflare-challenges/precursor.mdx line 79	Bullet list has fewer than three items — Line 79 begins a two-item bullet list comparing Challenges and Precursor Fix: Consider writing the comparison as prose
cloudflare-challenges/concepts/clearance.mdx line 21	Bullet list has fewer than three items — Two-item bullet list introduces Challenge clearance and Precursor clearance Fix: Rewrite the two items as prose or expand the list to three or more items
cloudflare-challenges/concepts/clearance.mdx line 55	Bullet list has fewer than three items — Two-item bullet list describes Precursor suspicious session consequences Fix: Rewrite the two items as prose or expand the list to three or more items

Redirects

_{No missing redirect entries found.}

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[marinaelmore]

/full-review