Function ensureCodexAgentsFile

src/utils/codex-agents.ts:29–44

(codexHome: string)

`

export async function ensureCodexAgentsFile(codexHome: string): Promise<void> {
  await ensureDir(codexHome)
  const filePath = path.join(codexHome, "AGENTS.md")
  const block = buildCodexAgentsBlock()

  if (!(await pathExists(filePath))) {
    await writeText(filePath, block + "\n")
    return
  }

  const existing = await readText(filePath)
  const updated = upsertBlock(existing, block)
  if (updated !== existing) {
    await writeText(filePath, updated)
  }
}

function buildCodexAgentsBlock(): string {
  return [CODEX_AGENTS_BLOCK_START, CODEX_AGENTS_BLOCK_BODY.trim(), CODEX_AGENTS_BLOCK_END].join("\n")