[alexcarpenter]

Description

Stacked on #10047.

Seeds Mosaic's errors.* catalog with the English copy legacy @clerk/ui shows for Clerk error codes (unstable__errors in @clerk/localizations), so the same error reads the same in both UIs. Mosaic's catalog goes from 18 to 48 entries (passkeys, Web3, organizations, tickets, protect checks and more).

• Placeholders are converted from {{x}} to Mosaic's {x}.
• Legacy's api_key_name_already_exists and api_key_usage_exceeded are keyed by the backend codes they map from, token_creation_conflict and token_quota_exceeded.
• Entries legacy leaves undefined are skipped, so Clerk's own message still shows for those codes, as in legacy.
• already_a_member_in_organization is skipped because no Mosaic caller supplies its {email} value yet.
• The passwordComplexity and zxcvbn groups are password-strength copy, not error codes, and are not part of this catalog.
• English only. Mosaic does not ship locale packs, so translations are still supplied by the consumer's catalog.

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

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Project	Deployment	Actions	Updated
clerk-js-sandbox	Ready	Preview	Oct 6, 2026 1:34pm UTC
swingset	Ready	Preview	Oct 6, 2026 1:34pm UTC

[changeset-bot]

🦋 Changeset detected

Latest commit: 057ede4

The changes in this PR will be included in the next version bump.

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Reviewing files that changed from the base of the PR and between bffb1fc and 58b1c93.

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• packages/mosaic/src/localization/errors.messages.ts

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• clerk/clerk_go (manual)
• clerk/dashboard (manual)
• clerk/accounts (manual)
• clerk/backoffice (manual)
• clerk/clerk (manual)
• clerk/clerk-docs (manual)
• clerk/cloudflare-workers (manual)
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• clerk/cli (auto-detected)

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---

📝 Walkthrough

Walkthrough

The Mosaic error catalog now includes user-facing messages for CAPTCHA, password, organization, OAuth, passkey, Protect, ticket, token, pending verification, and Web3 errors. The API-key TODO now states that the catalog covers token quota and creation conflict errors. A changeset file contains two YAML document delimiters.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: austincalvelage

Merge Risk: ⚪ Minimal · up to 58b1c

No concrete user-facing or operational regression is established in the supplied change context, so there is no identified blocker to merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding legacy English error copy to Mosaic’s error catalog.
Description check	✅ Passed	The description explains the catalog additions and key implementation details. It is directly related to the changeset.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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commit: 057ede4

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Actionable comments posted: 1

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• clerk/clerk (manual)
• clerk/clerk-docs (manual)
• clerk/cloudflare-workers (manual)
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• clerk/clerk-android (auto-detected)
• clerk/cli (auto-detected)

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[Ephem]

Now that we have co-located translations in .messages. files (if we are keeping that?), do you think it makes sense to also co-locate errors like these? Would require us to pass in "extra errors" to useErrorText() but I think there's a few nice properties about this:

• It's easier to see all feature-specific translations in one place and thus:
• It's easier to see if a full feature has been translated to another language
• It could code-split well (with more work, and this benefit is pretty minor for errors specifically)

I could see how there are cases where it doesn't map cleanly to one single .messages. file though and there are other arguments for keeping errors in a single place too so not clear cut for me but wanted to bring it up.