What is appstore-metadata-sync?

A tool for editing, checking, and synchronizing the canonical JSON files that hold App Store listing information. It also supports moving older Fastlane metadata into the newer format.

Use it to pull metadata, edit app-info and version fields, validate changes, prepare keyword updates, and push or migrate metadata.

It keeps store metadata in a consistent local structure and helps create predictable commands for reviewing or sending changes to App Store Connect.

appstore-metadata-sync — Skill for Claude Code and Codex by Xopoko

Install

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.

Any agent

npx skills add Xopoko/build-swift-apps --skill appstore-metadata-sync

Clone the repo

git clone --depth 1 https://github.com/Xopoko/build-swift-apps

Made for: Claude Code, Codex.

Or install build-swift-apps, the plugin that ships this one along with the rest of its 61 skills, 3 commands, 3 MCP servers.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/xopoko/build-swift-apps/appstore-metadata-sync/github.svg)](https://agentmods.dev/skills/xopoko/build-swift-apps/appstore-metadata-sync)

Your own site

<a href="https://agentmods.dev/skills/xopoko/build-swift-apps/appstore-metadata-sync"><img src="https://agentmods.dev/badge/skills/xopoko/build-swift-apps/appstore-metadata-sync/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/xopoko/build-swift-apps/appstore-metadata-sync"><img src="https://agentmods.dev/badge/skills/xopoko/build-swift-apps/appstore-metadata-sync.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 493 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

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	$0.00051	$0.00493
Opus 5	$0.00026	$0.00246
Sonnet 5	$0.00010	$0.00099
Haiku 4.5	$0.00005	$0.00049

Measured 9d ago against content hash 6f53bb08bd19, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

appstore-metadata-sync 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 9d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/metadata_sync_plan.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/appstore-metadata-sync/SKILL.md · 38 lines

What it actually says

App Store Metadata Sync

Prefer canonical asc metadata JSON for app-info and version fields. Use .strings or fastlane flows only when specifically needed.

Use appstore-metadata-localizer when the main work is translation/adaptation across locales. Use appstore-release-notes-writer for What's New copy. Use appstore-subscription-localizer for subscription, group, or IAP display-name localizations.

Command Plan Helper

For a deterministic dry-run command plan, run the helper from the plugin root:

python3 "$PLUGIN_ROOT/skills/appstore-metadata-sync/scripts/metadata_sync_plan.py" \
  --app "APP_ID" --version "1.2.3" --platform IOS --dir "./metadata" \
  --app-info "APP_INFO_ID" --version-id "VERSION_ID" \
  --include-keywords --keywords-csv "./keywords.csv"

The helper prints commands only; it does not call ASC, mutate metadata, or read credentials. Pass --json for machine-readable output. Pass --confirming-actions only after manually verifying generated --confirm commands.

Workflow

Pull canonical metadata JSON into ./metadata before editing unless the user already provided a fresh metadata tree.
Resolve APP_INFO_ID when multiple app-info records exist.
Edit the owning JSON fields: app-info fields for name/subtitle/privacy text and version fields for description, keywords, marketing URL, promotional text, support URL, and What's New.
Validate locally, then run push --dry-run; apply/push without dry-run only after the diff and target app/version are confirmed.
Use alternate .strings or fastlane migration flows only for legacy repos or explicit user requests.

Limits: name/subtitle 30, keywords 100, description/What's New 4000, promotional text 170. Use table output for human verification and JSON for automation.

References

references/appstore-metadata-sync.md for detailed canonical JSON, keyword, quick-edit, .strings, and fastlane commands.

Files

What ships with it

3 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.

Changes

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.

9d ago First seen · 38 lines · 51 tokens per session scan A 6f53bb08bd19

Subscribe to this mod's changes

appstore-metadata-sync is a skill published in the GitHub repository Xopoko/build-swift-apps (45 stars, last pushed 12d ago), licensed MIT. It adds 51 tokens to every session and 493 once invoked, about $0.0003 per session on Opus 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 2026-08-30.

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