docs: Add missing lastModified field to sign-up-rules.mdx

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Adds the required lastModified field to the sign-up-rules.mdx frontmatter. Per client documentation requirements, all new MDX documents must include a lastModified field in the frontmatter with the current date.

Trigger Events

stack-auth/stack-auth commit (dev): 4af1534 docs: Document Sign-up Rules feature (#1183)

Promptless Research (1 GitHub PR)

• Reviewed stack-auth/stack-auth#1183

Agent Response

I've completed my analysis of this commit and created a suggestion to fix an issue I found.

Summary

Trigger: Commit 4af1534 merged PR #1183 which documented the Sign-up Rules feature.

What I found: The new sign-up-rules.mdx file was missing the required lastModified field in its frontmatter. Per documentation requirements, all new MDX documents must include this field with the current date.

Fix created: I created a suggestion that adds the missing lastModified: "2026-02-24" field to the sign-up-rules.mdx frontmatter.

The underlying Sign-up Rules documentation content itself is comprehensive and well-written, covering rule creation, conditions, actions, priority/default settings, common use cases, analytics, and the rule testing feature.

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Citation: Client instructions require that "Every new MDX document must include a lastModified field in the frontmatter with the current date in YYYY-MM-DD format." The sign-up-rules.mdx file added by PR #1183 was missing this required field.
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Project	Deployment	Actions	Updated (UTC)
stack-backend	Ready	Preview, Comment	Feb 24, 2026 4:50pm
stack-dashboard	Ready	Preview, Comment	Feb 24, 2026 4:50pm
stack-demo	Ready	Preview, Comment	Feb 24, 2026 4:50pm
stack-docs	Ready	Preview, Comment	Feb 24, 2026 4:50pm

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[greptile-apps]

Greptile Summary

Adds the lastModified frontmatter field to the newly created sign-up-rules.mdx documentation file. The field is set to "2026-02-24" and follows the same date format pattern used in other documentation files. This is a metadata-only change that completes the frontmatter for the Sign-up Rules documentation that was introduced in PR #1183.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The change only adds a single optional metadata field to documentation frontmatter, following the existing pattern used in other MDX files. No code logic is affected, and the field is properly formatted according to the schema.
• No files require special attention

Important Files Changed

Filename	Overview
docs/content/docs/(guides)/concepts/sign-up-rules.mdx	Added missing lastModified field to frontmatter with date "2026-02-24"

_{Last reviewed commit: d5f5aad}

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_{1 file reviewed, no comments}

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