14 shipped SKILL.md frontmatters are not valid YAML (unquoted : in description) #2467

Version

LifeOS 8.761.0 (tag v8.761.0, fb9aef4).

What is broken

14 of the 97 skills under install/skills/ have an unquoted description: value that contains : , for example Three-layer bias analysis of any URL, file, or text: fetches the content…. In YAML that sequence is not allowed inside a plain scalar, so any standard YAML parser rejects the whole frontmatter block. Claude Code still loads these skills, but other tools that read SKILL.md frontmatter with a YAML parser (skill indexes, cross-harness projections, linters) fail on them or skip them. LifeOS's own SkillHygieneGate does not catch this, because it parses one key's lines at a time.

Affected skills: BiasCheck, Brand, ComputerUse, DataRefresh, DetectAI, Development, Explain, Hermes, Spotify, StudioLights, ThreatModel, Trim, Workflows, X.

Where (file:line)

• install/skills/<Skill>/SKILL.md, the description: line of each skill listed above (for example install/skills/BiasCheck/SKILL.md:7, install/skills/X/SKILL.md:15, install/skills/Workflows/SKILL.md:11).
• install/LIFEOS/TOOLS/SkillHygieneGate.ts:399 parses per key (Bun.YAML.parse(block…)), not the whole frontmatter, so the gate stays green.

Repro on a clean tree

From the LifeOS/install/skills directory of a v8.761.0 checkout:

bun -e 'import {readdirSync,readFileSync,existsSync} from "node:fs"; const bad=[];
for (const d of readdirSync(".")) { const f=`${d}/SKILL.md`; if (!existsSync(f)) continue;
  const fm=readFileSync(f,"utf8").match(/^---\r?\n([\s\S]*?)\r?\n---/)?.[1]; if (!fm) continue;
  try { Bun.YAML.parse(fm) } catch { bad.push(d) } }
console.log(bad.length, bad.sort().join(" "))'

Output:

14 BiasCheck Brand ComputerUse DataRefresh DetectAI Development Explain Hermes Spotify StudioLights ThreatModel Trim Workflows X

The yaml npm package, already a LifeOS dependency, rejects the same 14 of 97.

Negative control

The other 83 skills parse cleanly with both parsers. All 14 failing files share one pattern, grep '^description: [^"'"'"'>|].*: ', and quoting the description value makes such a block parse.

Suggested fix

Quote the 14 description values (or use a >- block scalar). Add a whole-frontmatter YAML.parse check to SkillHygieneGate so a new unquoted : goes red. Untested.