Build a pattern file from all keys and grep in one pass Skill

Purpose

Manage translation assets on Loco (localise.biz) from the CLI. Supports three commands:

create — Create a new translation key, auto-translate to all project locales, and tag for review
delete — Delete an existing translation key after confirmation
scan — Scan the codebase for unused translation keys

Environment Variables

This skill uses Loco API keys set as environment variables. The naming convention supports multiple projects:

LOCO_API_KEY_<PROJECT> — Per-project key (e.g., LOCO_API_KEY_IOS, LOCO_API_KEY_ANDROID, LOCO_API_KEY_WEB)
LOCO_API_KEY — Single-project fallback when only one project exists

API Reference

All API calls use the Authorization header. Never pass the API key as a query parameter.

Authentication Header

Authorization: Loco $LOCO_KEY

Verify Credentials

curl -s -f -H "Authorization: Loco $LOCO_KEY" https://localise.biz/api/auth/verify

List All Assets

curl -s -f -H "Authorization: Loco $LOCO_KEY" https://localise.biz/api/assets

Get Single Asset

curl -s -f -H "Authorization: Loco $LOCO_KEY" "https://localise.biz/api/assets/$ASSET_ID"

Create Asset

curl -s -f -X POST -H "Authorization: Loco $LOCO_KEY" \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "id=$KEY&text=$TEXT&type=text&context=$CONTEXT" \
  https://localise.biz/api/assets

Delete Asset

curl -s -f -X DELETE -H "Authorization: Loco $LOCO_KEY" \
  "https://localise.biz/api/assets/$ASSET_ID"

Set Translation for a Locale

curl -s -f -X POST -H "Authorization: Loco $LOCO_KEY" \
  -H "Content-Type: text/plain" \
  --data-raw "$TRANSLATION_TEXT" \
  "https://localise.biz/api/translations/$ASSET_ID/$LOCALE"

Tag an Asset

curl -s -f -X POST -H "Authorization: Loco $LOCO_KEY" \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "name=$TAG_NAME" \
  "https://localise.biz/api/assets/$ASSET_ID/tags"

List Project Locales

curl -s -f -H "Authorization: Loco $LOCO_KEY" https://localise.biz/api/locales

Steps

Step 1: Detect Project

Detect which Loco project(s) are configured by scanning environment variables.

env | grep '^LOCO_API_KEY'

If no variables found:

Tell the user: "No Loco API key found. Set LOCO_API_KEY (single project) or LOCO_API_KEY_<PROJECT> (multi-project) as an environment variable. You can find your API key at https://localise.biz under Project > API Keys."
Stop here.

If exactly one variable found:

Use that key. Extract the project name from the variable suffix (e.g., LOCO_API_KEY_IOS → project "IOS"), or "default" if using LOCO_API_KEY.

If multiple variables found:

List the available projects and ask the user which one to use.
If the user specified a project in their command (e.g., /loco create --project ios "key" "text"), use that directly.

Verify the key works:

curl -s -f -H "Authorization: Loco $LOCO_KEY" https://localise.biz/api/auth/verify

If verification fails, tell the user the API key is invalid and stop.

Important: After resolving the key, store it in a shell variable LOCO_KEY for all subsequent API calls. Never echo or log the key value.

Command: Create

Use this flow when the user wants to create a new translation key.

Step 2: Parse Arguments

Extract from the user's request:

KEY (required) — The translation key identifier (e.g., settings.notifications.title)
TEXT (required) — The English source text (e.g., "Notification Settings")
--context (optional) — Context hint for translators (e.g., "Title of the notifications settings page")
--tags (optional) — Comma-separated tags to apply (e.g., "settings,v2.1")
--no-translate (optional) — Skip auto-translation, only create the asset with English text

Step 3: Validate Key Does Not Exist

Fetch existing assets and check if the key already exists:

curl -s -f -H "Authorization: Loco $LOCO_KEY" "https://localise.biz/api/assets/$(echo -n "$KEY" | jq -sRr @uri)"

If the asset exists (HTTP 200), tell the user: "Key $KEY already exists. Use a different key or delete the existing one first."

Stop here if the key exists.

Step 4: Analyze Naming Conventions

Fetch a sample of existing keys to detect the project's naming patterns:

curl -s -f -H "Authorization: Loco $LOCO_KEY" https://localise.biz/api/assets | jq -r '.[0:50] | .[].id'

Analyze the sample for:

Separator: dots (settings.title), underscores (settings_title), or camelCase (settingsTitle)
Hierarchy depth: flat (login_button) vs nested (auth.login.button)
Prefix patterns: common prefixes like screen., feature., error.
Casing: lowercase, UPPER_CASE, Title_Case

If the proposed KEY deviates from detected conventions, warn the user. For example:

"Existing keys use dot-separated lowercase (e.g., settings.notifications.enabled). Your key Settings_Notifications_Title doesn't match. Suggested: settings.notifications.title. Proceed anyway?"

If the user confirms or the key matches conventions, continue.

Step 5: Create the Asset

curl -s -f -X POST -H "Authorization: Loco $LOCO_KEY" \
  -H "Content-Type: application/x-www-form-urlencoded" \
  --data-urlencode "id=$KEY" \
  --data-urlencode "text=$TEXT" \
  -d "type=text" \
  --data-urlencode "context=$CONTEXT" \
  https://localise.biz/api/assets

If the creation fails, report the error and stop.

Step 6: Set English Translation

curl -s -f -X POST -H "Authorization: Loco $LOCO_KEY" \
  -H "Content-Type: text/plain" \
  --data-raw "$TEXT" \
  "https://localise.biz/api/translations/$(echo -n "$KEY" | jq -sRr @uri)/en"

Step 7: Auto-Translate to All Locales

If --no-translate was specified, skip this step.

Fetch all project locales:

curl -s -f -H "Authorization: Loco $LOCO_KEY" https://localise.biz/api/locales | jq -r '.[].code'

Filter out English locales (any starting with en).

For each remaining locale:

Translate the English text using Claude. Provide the locale code, source text, any context, and placeholder preservation rules (see Placeholder Preservation Rules below).
Validate placeholders — Extract all placeholders from the source text and verify they appear identically in the translation. If validation fails, skip this locale and include it in the error report.
Push the translation:

curl -s -f -X POST -H "Authorization: Loco $LOCO_KEY" \
  -H "Content-Type: text/plain" \
  --data-raw "$TRANSLATED_TEXT" \
  "https://localise.biz/api/translations/$(echo -n "$KEY" | jq -sRr @uri)/$LOCALE"

Step 8: Tag the Asset

Always tag with needs-review:

curl -s -f -X POST -H "Authorization: Loco $LOCO_KEY" \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "name=needs-review" \
  "https://localise.biz/api/assets/$(echo -n "$KEY" | jq -sRr @uri)/tags"

If --tags was provided, also apply each custom tag:

curl -s -f -X POST -H "Authorization: Loco $LOCO_KEY" \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "name=$TAG" \
  "https://localise.biz/api/assets/$(echo -n "$KEY" | jq -sRr @uri)/tags"

Step 9: Report Summary

Display a summary table:

Key:       settings.notifications.title
Text:      Notification Settings
Project:   IOS

Translations:
| Locale | Translation              | Status |
|--------|--------------------------|--------|
| en     | Notification Settings    | Set    |
| fr     | Paramètres de notification | Auto   |
| de     | Benachrichtigungseinstellungen | Auto |
| es     | Configuración de notificaciones | Auto |
| ja     | 通知設定                   | Auto   |

Tags: needs-review, settings

If any locales failed placeholder validation, include a warnings section:

Warnings:
- ar: Skipped — placeholder mismatch (expected %d, got none)

Command: Delete

Use this flow when the user wants to delete a translation key.

Step 2: Find the Asset

curl -s -f -H "Authorization: Loco $LOCO_KEY" "https://localise.biz/api/assets/$(echo -n "$KEY" | jq -sRr @uri)"

If the asset is not found (HTTP 404), tell the user: "Key $KEY not found." and stop.

Step 3: Show Details

Display the asset details to the user:

Key ID
Source text
Number of translations
Tags

Step 4: Confirm Deletion

This confirmation is mandatory. Never skip it.

Ask the user: "Are you sure you want to delete $KEY? This will remove the asset and all its translations. This cannot be undone."

If the user does not confirm, stop here.

Step 5: Delete and Report

curl -s -f -X DELETE -H "Authorization: Loco $LOCO_KEY" \
  "https://localise.biz/api/assets/$(echo -n "$KEY" | jq -sRr @uri)"

Report: "Deleted $KEY and all its translations."

If the deletion fails, report the error.

Command: Scan

Use this flow when the user wants to find unused translation keys in the codebase.

Step 2: Fetch All Asset Keys

curl -s -f -H "Authorization: Loco $LOCO_KEY" https://localise.biz/api/assets | jq -r '.[].id'

Save the full list of keys.

Step 3: Detect Platform(s)

Auto-detect which platforms exist in the repository by checking for indicator files:

| Platform | Indicator Files | |-------------|-------------------------------------------------------------------------------| | iOS/macOS | *.xcodeproj, *.xcworkspace, Package.swift, *.strings, *.stringsdict | | Android | AndroidManifest.xml, build.gradle, build.gradle.kts, strings.xml | | Rails | Gemfile with rails, config/locales/, *.yml locale files | | Web (JS/TS) | package.json, i18n/, locales/, *.vue, *.tsx, *.jsx | | Flutter | pubspec.yaml, *.dart, *.arb | | .NET | *.csproj, *.resx | | Go | go.mod | | Python | requirements.txt, pyproject.toml, django, gettext |

Step 4: Search Codebase for Key Usage

For each detected platform, search the codebase using platform-appropriate patterns:

iOS/macOS:

NSLocalizedString("KEY"
String(localized: "KEY"
"KEY" = "  (in .strings files)

Android:

R.string.KEY
@string/KEY
<string name="KEY"

Rails:

I18n.t("KEY"
I18n.t('KEY'
t("KEY"
t('KEY'
t(:KEY

Web (JS/TS/Vue):

$t("KEY"
$t('KEY'
t("KEY"
t('KEY'
i18n.t("KEY"
i18n.t('KEY'

Flutter:

AppLocalizations.of(context).KEY
"KEY" (in .arb files)

Efficient batch approach:

Write all keys to a temporary variable/list.
Use the Grep tool to search the entire codebase for each key.
Collect the set of keys that were found.
Compute the difference: keys in Loco but not found in code = potentially unused.

Important: For large key sets (>100 keys), search in batches using grep with multiple patterns to avoid per-key overhead:

# Build a pattern file from all keys and grep in one pass
echo "$ALL_KEYS" | grep -F -r -l -f - --include="*.swift" --include="*.m" --include="*.strings" --include="*.xml" --include="*.rb" --include="*.yml" --include="*.js" --include="*.ts" --include="*.vue" --include="*.jsx" --include="*.tsx" --include="*.dart" --include="*.arb" --include="*.resx" --include="*.go" --include="*.py" .

Or use the Grep tool for each key individually if the key set is small (<100 keys).

Step 5: Report Results

Display a summary:

Loco Scan Report
================
Project:      IOS
Total assets: 342
Referenced:   318
Unused:       24

Potentially Unused Keys:
| # | Key                           | Source Text              |
|---|-------------------------------|--------------------------|
| 1 | legacy.old_feature.title      | Old Feature              |
| 2 | deprecated.screen.description | This screen is deprecated|
| ...                                                         |

Caveats:
- Dynamic keys (e.g., `t("error.#{code}")`) cannot be detected by static analysis.
- Keys used in configuration files, backend templates, or external services may not appear in the codebase.
- Review this list manually before deleting any keys.

Placeholder Preservation Rules

When translating text, all placeholders must be preserved exactly as they appear in the source. The following placeholder formats must be detected and validated:

Apple (iOS/macOS)

%@ — Object (string)
%d — Integer
%f — Float
%ld, %lld — Long/long long
%1$@, %2$d — Positional arguments

Ruby / Rails

%{name} — Named interpolation
%<name>s — Formatted named interpolation

Android

%1$s, %2$d — Positional arguments
%s, %d — Sequential arguments

ICU Message Format

{name} — Simple replacement
{count, plural, one {# item} other {# items}} — Plural rules
{gender, select, male {He} female {She} other {They}} — Select rules

HTML

HTML tags (<b>, <a href="...">, <br/>, etc.) — preserve exactly

Validation

After generating a translation, extract all placeholders from both source and translation using regex patterns:

Apple: %(\d+\$)?[@ dfsld]+ and %% (escaped percent)
Ruby: %\{[^}]+\} and %<[^>]+>[sdfi]
Android: %(\d+\$)?[sd]
ICU: \{[^}]+\}
HTML: <[^>]+>

Compare the sets. If any placeholder is missing or added in the translation, the validation fails. Skip that locale and report it.

Safety Guardrails

Always confirm before delete — Never delete an asset without explicit user confirmation.
Never echo API key values — Use $LOCO_KEY in commands but never print its value. If debugging, show LOCO_API_KEY_*** is set instead.
Always use Authorization header — Never pass the API key as a query parameter (?key=...). Always use Authorization: Loco $LOCO_KEY.
Tag all auto-translations — Every asset with auto-translated text gets the needs-review tag.
Skip on placeholder failure — If placeholder validation fails for a locale, skip it and report the failure rather than pushing a broken translation.

Rules

English is always the source language. All translations are generated from the English text. Never translate from a non-English locale.
Locales are dynamic. Always fetch the project's locales from the API. Never hardcode a locale list.
Preserve all placeholders exactly. Placeholders must appear identically in every translation. See Placeholder Preservation Rules.
Always confirm before destructive actions. Delete operations require explicit user confirmation. This is not optional.
Analyze naming conventions before creating. Fetch existing keys, detect patterns, and warn if the proposed key deviates.
Tag every auto-translated asset. Apply needs-review to all assets that receive auto-translations.
Support multi-project setups. Check for multiple LOCO_API_KEY_* variables and prompt the user to select one if needed.
URL-encode asset IDs in API paths. Keys containing dots, slashes, or special characters must be URL-encoded in API URLs.
Scan caveats are mandatory. Always include the caveats section in scan reports. Dynamic keys, backend-only keys, and config-file keys cannot be detected by static analysis.
Never expose secrets. Do not echo, log, or display API key values in output or error messages.

Agent Skills: Build a pattern file from all keys and grep in one pass

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