Send a prompt to OpenAI Codex and get its response back. Codex can, if sandbox_mode is set to workspace-write, actually run shell commands and edit files under working_directory — not just answer in text. Pass the thread_id from a prior call to continue that conversation; omit it to start a fresh one. Independent calls (different or omitted thread_id) run concurrently as separate Codex conversations, so this can be used for many parallel queries as well as a single ongoing one.

List Codex Cloud background tasks, or (with task_id) show the status of one. Wraps the undocumented codex cloud list --json / codex cloud status <id> CLI commands — field names in the JSON list output are not guaranteed stable across Codex CLI versions. status has no --json form; its output is returned as-is.

List recent local Codex CLI sessions — the ones codex resume picks from — most recently touched first. Reads the undocumented ~/.codex/session_index.jsonl index directly, since codex resume itself is an interactive-only picker with no scriptable output. Only exposes what that index carries: session id, current thread name, and last-updated time — not live/idle status or working directory.

Read the message history of any Codex thread — whether it was created interactively (GUI / VS Code / TUI) or programmatically. Reads the thread's rollout JSONL from ~/.codex/sessions directly, so it needs no API call, consumes no quota, and works even when the account is rate-limited. Returns the most recent messages by default.