Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add existential-birds/beagle --skill cloudkit-code-reviewgit clone --depth 1 https://github.com/existential-birds/beagleWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/existential-birds/beagle/cloudkit-code-review)<a href="https://agentmods.dev/skills/existential-birds/beagle/cloudkit-code-review"><img src="https://agentmods.dev/badge/skills/existential-birds/beagle/cloudkit-code-review/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/existential-birds/beagle/cloudkit-code-review"><img src="https://agentmods.dev/badge/skills/existential-birds/beagle/cloudkit-code-review.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00044 | $0.00844 |
| Opus 5.5 | $0.00018 | $0.00338 |
| Sonnet 5.5 | $0.00009 | $0.00169 |
| Haiku 4.5 | $0.00004 | $0.00084 |
Grade A, and why
cloudkit-code-review scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CloudKit Code Review
Quick Reference
| Issue Type | Reference |
|---|---|
| CKContainer, databases, zones, entitlements | references/container-setup.md |
| CKRecord, references, assets, batch operations | references/records.md |
| CKSubscription, push notifications, silent sync | references/subscriptions.md |
| CKShare, participants, permissions, acceptance | references/sharing.md |
Review Checklist
- Account status checked before private/shared database operations
- Custom zones used (not default zone) for production data
- All CloudKit errors handled with
retryAfterSecondsrespected -
serverRecordChangedconflicts handled with proper merge logic -
CKErrorPartialFailureparsed for individual record errors - Batch operations used (
CKModifyRecordsOperation) not individual saves - Large binary data stored as
CKAsset(records have 1MB limit) - Record keys type-safe (enums) not string literals
- UI updates dispatched to main thread from callbacks
-
CKAccountChangedNotificationobserved for account switches - Subscriptions have unique IDs to prevent duplicates
- CKShare uses custom zone (sharing requires custom zones)
When to Load References
- Reviewing container/database setup or zones -> container-setup.md
- Reviewing record CRUD or relationships -> records.md
- Reviewing push notifications or sync triggers -> subscriptions.md
- Reviewing sharing or collaboration features -> sharing.md
Output Format
Report issues using: [FILE:LINE] ISSUE_TITLE
Examples:
[AppDelegate.swift:24] CKContainer not in custom zone[SyncManager.swift:156] Unhandled CKErrorPartialFailure[DataStore.swift:89] Missing retryAfterSeconds backoff
Review Questions
- What happens when the user is signed out of iCloud?
- Does error handling respect rate limiting (
retryAfterSeconds)? - Are conflicts resolved or does data get overwritten silently?
- Is the schema deployed to production before App Store release?
- Are shared records in custom zones (required for CKShare)?
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 66 lines · 44 tokens per session scan A b32f4fec91c0
cloudkit-code-review is a skill published in the GitHub repository existential-birds/beagle (82 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 44 tokens to every session and 844 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-16.
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