fix: YAML-quote frontmatter description values

src/Cli.ts

@@ -2,6 +2,7 @@ import * as fs from 'node:fs/promises'
 import * as os from 'node:os'
 import * as path from 'node:path'
 import { estimateTokenCount, sliceByTokens } from 'tokenx'
+import { parse as yamlParse } from 'yaml'
 import type { z } from 'zod'
 
 import * as Completions from './Completions.js'
@@ -1565,10 +1566,11 @@ async function fetchImpl(
     if (segments[2] === 'index.json' && segments.length === 3) {
       const files = Skill.split(name, cmds, 1, groups)
       const skills = files.map((f) => {
-        const descMatch = f.content.match(/^description:\s*(.+)$/m)
+        const fmMatch = f.content.match(/^---\n([\s\S]*?)\n---/)
+        const meta = fmMatch ? (yamlParse(fmMatch[1]!) as Record<string, string>) : {}
         return {
           name: f.dir || name,
-          description: descMatch?.[1] ?? '',
+          description: meta.description ?? '',
           files: ['SKILL.md'],
         }
       })

src/Skill.test.ts

@@ -341,6 +341,14 @@ describe('split', () => {
     expect(files[0]!.content).toContain('requires_bin: gh')
   })
 
+  test('YAML-quotes description containing colon-space', () => {
+    const groups = new Map([['search', 'Search items. Use key: value for precision']])
+    const files = Skill.split('app', [{ name: 'search list', description: 'List results' }], 1, groups)
+    expect(files[0]!.content).toContain(
+      'description: "Search items. Use key: value for precision. List results. Run `app search --help` for usage details."',
+    )
+  })
+
   test('no per-command frontmatter in split files', () => {
     const files = Skill.split('gh', commands, 1, groups)
     const afterFrontmatter = files[0]!.content.slice(

src/Skill.ts

@@ -1,5 +1,6 @@
 import { createHash } from 'node:crypto'
 import type { z } from 'zod'
+import { stringify as yamlStringify } from 'yaml'
 
 import * as Schema from './Schema.js'
 
@@ -132,13 +133,14 @@ function renderGroup(
     .replace(/[^a-z0-9-]+/g, '-')
     .replace(/-{2,}/g, '-')
     .replace(/^-|-$/g, '')
-  const fm = ['---', `name: ${slug}`]
-  fm.push(`description: ${description}`)
-  fm.push(`requires_bin: ${cli}`)
-  fm.push(`command: ${title}`, '---')
+  const fm = yamlStringify(
+    { name: slug, description, requires_bin: cli, command: title },
+    { lineWidth: 0 },
+  ).trimEnd()
+  const fmBlock = `---\n${fm}\n---`
 
   const body = cmds.map((cmd) => renderCommandBody(cli, cmd)).join('\n\n---\n\n')
-  return `${fm.join('\n')}\n\n${body}`
+  return `${fmBlock}\n\n${body}`
 }
 
 /** @internal Renders a command's heading and sections without frontmatter. */