Function getDynamicSkillAttachments

src/utils/attachments.ts:2554–2608

* Processes skill directories that were discovered during file operations. * Uses dynamicSkillDirTriggers field from ToolUseContext

(
  toolUseContext: ToolUseContext,
)

 * Uses dynamicSkillDirTriggers field from ToolUseContext
 */
async function getDynamicSkillAttachments(
  toolUseContext: ToolUseContext,
): Promise<Attachment[]> {
  const attachments: Attachment[] = []

  if (
    toolUseContext.dynamicSkillDirTriggers &&
    toolUseContext.dynamicSkillDirTriggers.size > 0
  ) {
    // Parallelize: readdir all skill dirs concurrently
    const perDirResults = await Promise.all(
      Array.from(toolUseContext.dynamicSkillDirTriggers).map(async skillDir => {
        try {
          const entries = await readdir(skillDir, { withFileTypes: true })
          const candidates = entries
            .filter(e => e.isDirectory() || e.isSymbolicLink())
            .map(e => e.name)
          // Parallelize: stat all SKILL.md candidates concurrently
          const checked = await Promise.all(
            candidates.map(async name => {
              try {
                await stat(resolve(skillDir, name, 'SKILL.md'))
                return name
              } catch {
                return null // SKILL.md doesn't exist, skip this entry
              }
            }),
          )
          return {
            skillDir,
            skillNames: checked.filter((n): n is string => n !== null),
          }
        } catch {
          // Ignore errors reading skill directories (e.g., directory doesn't exist)
          return { skillDir, skillNames: [] }
        }
      }),
    )

    for (const { skillDir, skillNames } of perDirResults) {
      if (skillNames.length > 0) {
        attachments.push({
          type: 'dynamic_skill',
          skillDir,
          skillNames,
          displayPath: relative(getCwd(), skillDir),
        })
      }
    }

    toolUseContext.dynamicSkillDirTriggers.clear()
  }

  return attachments
}

// Track which skills have been sent to avoid re-sending. Keyed by agentId
// (empty string = main thread) so subagents get their own turn-0 listing —