ai-gateway validate rule: `\d+-\d+[)'"]` regex matches ISO dates as false positive

Summary

The posttooluse-validate hook's ai-gateway skill includes a validation rule intended to catch model slugs that use hyphens for version numbers (e.g., claude-sonnet-4-6 instead of claude-sonnet-4.6). The rule's regex \d+-\d+[)'"] is too broad and produces false positives on ISO 8601 date literals like 2026-05-16) in unrelated documents.

Reproduction

1. Use Edit/Write on any .md file under a project where the ai-gateway skill is matched (e.g., a doc that mentions Supabase + Vercel AI SDK in nearby content).

2. Include any text containing an ISO date followed by a closing paren, single quote, or double quote. Example:

   | 문서 버전 | v2 (2026-05-16) — 마크다운 정본 + 도구 어댑터 framing |
   

3. Hook blocks with:

   VALIDATION (1 error):
   - Line N [ERROR]: Model slug uses hyphens — use dots not hyphens for version numbers (e.g., claude-sonnet-4.6)
   

The 05-16) substring in 2026-05-16) matches \d+-\d+[)'"] and triggers the rule even though the line has nothing to do with a model identifier.

Expected

The rule should fire only on actual model slug contexts (e.g., claude-sonnet-4-6), gpt-4-1), or strings near model: or provider prefixes like anthropic/, openai/, google/).

Actual

Any MM-DD), MM-DD', or MM-DD" pattern fires the rule. This affects any markdown/docs that include dates such as authoring dates, changelogs, or YAML frontmatter dates rendered into text.

Root Cause

skills/ai-gateway/SKILL.md — the validate rule entry:

- pattern: \d+-\d+[)'"]
  message: 'Model slug uses hyphens — use dots not hyphens for version numbers (e.g., claude-sonnet-4.6)'
  severity: error

The pattern has no boundary anchoring or context requirement, so it matches numeric-hyphen-numeric substrings wherever they appear.

Suggested Fixes (any of)

1. Anchor to model slug context — require a known model family prefix:

   pattern: (?:claude|gpt|gemini|llama|mistral|sonnet|opus|haiku|flash|pro)-?\d+-\d+[)'"]
   

2. Negative lookbehind for digits — prevent matching the inside of larger numeric sequences (e.g., dates have 4-digit year preceding):

   pattern: (?<![\d-])\d+-\d+[)'"]
   

   This won't fix 05-16) after 2026- because of the hyphen, but combining with a length check on the left number would: model versions are typically \d{1,2}-\d{1,2}, dates have \d{4}-\d{2}-\d{2}.

3. skipIfMatchContains for date-like context — add a guard:

   pattern: \d+-\d+[)'"]
   skipIfFileContains: \d{4}-\d{2}-\d{2}
   

   This is coarse — better is per-match guard, but the skill rule schema may not support it yet.

4. Tighten to model assignment context — only fire inside string literals adjacent to model: or provider slashes:

   pattern: ['"][\w-]+/[\w-]*\d+-\d+[)'"]
   

   This narrows to actual provider/model slug strings such as 'anthropic/claude-sonnet-4-6'.

Environment

• vercel-plugin version: 0.22.0
• Cache path: ~/.claude/plugins/cache/claude-plugins-official/vercel/0b375ac333f1
• Triggered hook event: PostToolUse:Edit
• Matched skills (from hook output): ai-elements, ai-gateway, ai-generation-persistence, ai-sdk
• File that triggered: a Korean-language webfortd KB architecture doc containing the date 2026-05-16) in a metadata table row

Impact

Low severity but blocks Edit/Write until the false-positive line is reformatted. Korean date convention frequently uses ISO format with hyphens, so any documentation/changelog work in repos that match the ai-gateway skill paths hits this. Workaround on user side: use slashes or Korean text format for dates (2026/05/16 or 2026년 5월 16일), but that is an unrelated cost to a documentation author.

Start with the validate rule in skills/ai-gateway/SKILL.md and reproduce the false positive using an ISO date such as 2026-05-16). Check the rule against both date literals and model slugs such as claude-sonnet-4-6; done means dates no longer trigger while the intended model-version warning still does.