chore: sync Android skill guides (updated 2026-09-19)

[alisen]

Nightly Android Skills Sync

This PR was opened automatically by the Sync Android Skills workflow.
It updates the bundled skill guides in templates/android-skills/ to match
the latest content from github.com/android/skills.

It is rebuilt on top of main every night until merged — there is only
ever one open sync PR.

How to review

• Check that existing skill content looks correct
• New skill files are additions from Google's official repo
• Merge when ready — the next KoteGuard release will bundle the updated guides

Workflow: .github/workflows/sync-android-skills.yml

[Copilot]

🟡 Changes recommended

The newly added restore-credentials.skill.md contains broken internal links to a non-existent skill.md and includes “SYSTEM DIRECTIVE” phrasing that should be normalized to reduce prompt-injection risk in bundled prompt material.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR performs the nightly sync of bundled Android skill guides under templates/android-skills/ to align with the latest upstream content from github.com/android/skills, primarily updating metadata dates and reflowing markdown for readability, plus adding a new Restore Credentials guide.

Changes:

• Updated last-updated metadata and rewrapped many paragraphs/lines across existing skill guides.
• Added a new restore-credentials skill guide for implementing Credential Manager Restore Credentials.
• Incorporated a few substantive content updates (e.g., Media3 Cast dependency example version bump; Verified Email response example structure; Engage SDK debugging/verification checklist).

File summaries

File	Description
templates/android-skills/wear-compose-m3.skill.md	Metadata refresh + markdown reflow and minor formatting cleanup.
templates/android-skills/verified-email.skill.md	Metadata refresh + markdown reflow; updates the example response structure.
templates/android-skills/testing-setup.skill.md	Metadata refresh + markdown reflow for readability.
templates/android-skills/styles.skill.md	Metadata refresh + markdown reflow and formatting cleanup.
templates/android-skills/restore-credentials.skill.md	New skill guide added for Restore Credentials, including client flow + backend reminder section.
templates/android-skills/r8-analyzer.skill.md	Metadata refresh + markdown reflow.
templates/android-skills/play-billing.skill.md	Metadata refresh + markdown reflow.
templates/android-skills/navigation3.skill.md	Metadata refresh (minimal change).
templates/android-skills/media3-cast-integration.skill.md	Metadata refresh + markdown reflow; updates Media3 Cast dependency example.
templates/android-skills/leanback-to-compose-tv-migration.skill.md	Metadata refresh + markdown reflow and formatting cleanup.
templates/android-skills/engage-sdk-integration.skill.md	Metadata refresh + markdown reflow; expands debugging/verification checklist guidance.
templates/android-skills/edge-to-edge.skill.md	Metadata refresh + markdown reflow and formatting cleanup.
templates/android-skills/display-glasses-with-jetpack-compose-glimmer.skill.md	Metadata refresh + markdown reflow and formatting cleanup.
templates/android-skills/compose-migration.skill.md	Metadata refresh + markdown reflow and formatting cleanup.
templates/android-skills/camerax.skill.md	Metadata refresh + markdown reflow and formatting cleanup.
templates/android-skills/appfunctions.skill.md	Metadata refresh + markdown reflow and formatting cleanup.
templates/android-skills/android-intent-security.skill.md	Metadata refresh + markdown reflow; preserves security guidance content.
templates/android-skills/agp9.skill.md	Metadata refresh + markdown reflow and formatting cleanup.
templates/android-skills/adaptive.skill.md	Metadata refresh + markdown reflow and formatting cleanup.

Review details

Suppressed comments (1)

templates/android-skills/restore-credentials.skill.md:45

• These references also link to skill.md, which doesn’t exist in this repository, so the cross-references are dead. Since the targets are sections within this document, link to the local anchors instead.

1. Before the implementation, you **MUST** read and understand the [Two-Tier
   Restoration Architecture](skill.md) and review the [DOs and DON'Ts](skill.md).
2. After the implementation, you **MUST** present the developer with the [Backend Guidelines](skill.md) as a reminder for their backend setup. It is important that you remind the developer that they still have to implement the backend.

• Files reviewed: 19/19 changed files
• Comments generated: 2
• Review effort level: Lite

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.