Individual skill
chunking-numeric-and-otp
Use this skill when designing inputs or displays for numeric strings — phone numbers, OTP / verification codes, credit card numbers, account IDs, license keys, currency, dates, social security numbers. Trigger when picking a format for displaying numbers, designing OTP entry UIs, or formatting identifiers in tables and receipts. Sub-aspect of `chunking`; read that first.
plugins/HDeibler/universal-design-principles/plugins/cognition-and-learnability-principles/skills/chunking-numeric-and-otp/SKILL.md
Source commit d780783eba4ecc7c8b9429f95c9362df95f07c61
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- Observed behavior
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- Last checked
- Nov 4, 2026
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- Repository last updated
- Nov 6, 2026
- License
- Apache-2.0
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SKILL.mdcore · 7,153 bytesreferences/numeric-format-conventions.mddoc · 3,272 bytes
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# Chunking applied to numeric strings
Numbers are the canonical chunking case. A 10-digit phone number, a 16-digit credit card, a 6-digit OTP — without chunking, these are working-memory overloads. With chunking, they're manageable.
## Standard chunkings
Conventions that have evolved across industries:
| Type | Standard chunking | Example |
|---|---|---|
| US phone | 3-3-4 | 555-867-5309 |
| International phone | varies; usually 2-3-3-2 or similar | +44 20 7946 0958 |
| Credit card | 4-4-4-4 (most) or 4-6-5 (Amex) | 4242 4242 4242 4242 |
| Social Security (US) | 3-2-4 | 123-45-6789 |