Asc Metadata Sync

asc metadata sync and localization

Use this skill to keep local metadata in sync with App Store Connect, and to translate metadata to multiple languages.

Command discovery

• Always confirm flags with --help for the exact asc version.
• Prefer explicit long flags (--app, --version, --version-id, --type, --app-info).
• Default output is JSON; use --output table only for human verification steps.
• Prefer deterministic ID-based operations.

Two Types of Localizations

1. Version Localizations (per-release)

Fields: description, keywords, whatsNew, supportUrl, marketingUrl, promotionalText

# List version localizations
asc localizations list --version "VERSION_ID"

# Download
asc localizations download --version "VERSION_ID" --path "./localizations"

# Upload from .strings files
asc localizations upload --version "VERSION_ID" --path "./localizations"

2. App Info Localizations (app-level)

Fields: name, subtitle, privacyPolicyUrl, privacyChoicesUrl, privacyPolicyText

# First, find the app info ID
asc app-infos list --app "APP_ID"

# List app info localizations
asc localizations list --app "APP_ID" --type app-info --app-info "APP_INFO_ID"

# Upload app info localizations
asc localizations upload --app "APP_ID" --type app-info --app-info "APP_INFO_ID" --path "./app-info-localizations"

Note: If you get "multiple app infos found", you must specify --app-info with the correct ID.

Legacy Metadata Format Workflow

Export current state

asc migrate export --app "APP_ID" --output "./metadata"

Validate local files

asc migrate validate --help

Import updates

asc migrate import --help

Quick Field Updates

Version-specific fields

asc app-info set --app "APP_ID" --locale "en-US" --whats-new "Bug fixes"
asc app-info set --app "APP_ID" --locale "en-US" --description "Your description"
asc app-info set --app "APP_ID" --locale "en-US" --keywords "keyword1,keyword2"
asc app-info set --app "APP_ID" --locale "en-US" --support-url "https://support.example.com"

Version metadata

asc versions update --version-id "VERSION_ID" --copyright "2026 Your Company"
asc versions update --version-id "VERSION_ID" --release-type AFTER_APPROVAL

TestFlight notes

asc build-localizations create --build "BUILD_ID" --locale "en-US" --whats-new "TestFlight notes"

.strings File Format

Version localizations:

"description" = "Your app description";
"keywords" = "keyword1,keyword2,keyword3";
"whatsNew" = "What's new in this version";
"supportUrl" = "https://support.example.com";

App-info localizations:

"name" = "Your App Name";
"subtitle" = "Your subtitle";
"privacyPolicyUrl" = "https://example.com/privacy";

Translation Workflow (LLM-powered)

Step 1: Resolve IDs

asc apps list --output table
asc versions list --app "APP_ID" --state PREPARE_FOR_SUBMISSION --output table
asc app-infos list --app "APP_ID" --output table

Step 2: Download source locale

asc localizations download --version "VERSION_ID" --path "./localizations"
asc localizations download --app "APP_ID" --type app-info --app-info "APP_INFO_ID" --path "./app-info-localizations"

Step 3: Translate with LLM

See references/translation-guidelines.md for detailed translation rules, prompt template, and locale list.

Step 4: Upload translations

# Version localizations
asc localizations upload --version "VERSION_ID" --path "./localizations"

# App-info localizations
asc localizations upload --app "APP_ID" --type app-info --app-info "APP_INFO_ID" --path "./app-info-localizations"

Step 5: Verify

asc localizations list --version "VERSION_ID" --output table
asc localizations list --app "APP_ID" --type app-info --app-info "APP_INFO_ID" --output table

Character Limits

| Field | Limit | |-------|-------| | Name | 30 | | Subtitle | 30 | | Keywords | 100 (comma-separated) | | Description | 4000 | | What's New | 4000 | | Promotional Text | 170 |

Always validate translated text fits within limits before uploading. Use asc migrate validate to check.

Agent Behavior

1. Always read the source locale first — never translate from memory.
2. Check existing localizations before overwriting.
3. Version vs app-info is different — use the right --type flag.
4. Prefer deterministic IDs — don't auto-pick via head -1.
5. Validate character limits before uploading.
6. Keywords: do NOT literally translate — research locale-appropriate search terms.
7. Show translations to the user before uploading for approval.
8. Process one locale at a time for easier review.
9. If upload fails for a locale, continue with others and report all failures at the end.

Notes

• Version localizations are tied to a specific version.
• promotionalText can be updated anytime without a new version submission.
• whatsNew is only relevant for updates, not the first version.
• Privacy Policy URL is in app info localizations, not version localizations.
• For subscription/IAP display name localization, use asc-subscription-localization skill.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: Abdullah4AI
• Source: Abdullah4AI/apple-developer-toolkit
• License: MIT

Install and usage instructions live in the source repository linked above.