Refactor CLI help copy to terse, period-less Codex-CLI style

AGENTS.md

@@ -110,6 +110,7 @@ Lessons that cost time in agent sessions — read before exercising `uv run asse
 - Ruff lint set: see `[tool.ruff.lint]` in `pyproject.toml`. `S603/S607` are ignored project-wide because the CLI intentionally shells out to `claude`/`npx` with controlled args. `B008` is ignored (Typer uses `typer.Option/Argument` calls as defaults).
 - mypy is strict on `aai_cli` (`disallow_untyped_defs`); tests are type-checked but exempt from return annotations.
 - Errors → stderr, data → stdout. Preserve this split; it's what makes the CLI pipeline-safe.
+- **Help copy is terse and period-less (Codex-CLI style)**: one-line command summaries (the docstring's first line) and single-sentence option/argument `help=` strings are imperative, sentence-case, and carry **no trailing period** — `"Burn always-visible captions into a video"`, not `"…video."`. Only genuinely multi-sentence help (e.g. `"X. Default: Y."`) keeps normal punctuation. The strings render in `assembly --help`, so they're pinned by the syrupy `--help` goldens (`tests/__snapshots__/test_snapshots_help_*.ambr`) — regenerate with `--snapshot-update`, never hand-edit. Don't drop the period on internal helper docstrings (they aren't snapshot-covered, so the mutation gate would flag the changed line).
 - **Deprecate flags with hidden traps, not removal**: keep the old flag parsing (`hidden=True`), emit a one-line "use X instead" warning, and drop it a release or two later — never hard-break a script mid-cycle. `login --api-key` (→ `--with-api-key`) is the pattern to copy.
 - **Secrets never ride argv**: a key/token-valued option must read from stdin (`--with-api-key`) or the env, so it can't leak into shell history or `ps`. Run commands deliberately have no `--api-key` at all.
 - **Every NDJSON stream line carries a `"type"` field** (see REFERENCE.md "JSON output"); new event types are additive, existing fields stay stable.

aai_cli/commands/account.py

@@ -125,7 +125,7 @@ class _Usage(BaseModel):
     usage_items: Annotated[list[_Window], _MappingList] = Field(default_factory=list[_Window])
 
 
-app = typer.Typer(help="Account billing, usage, and limits.")
+app = typer.Typer(help="Account billing, usage, and limits")
 
 SPEC = command_registry.CommandModuleSpec(
     panel=help_panels.ACCOUNT,
@@ -147,7 +147,7 @@ def balance(
     ctx: typer.Context,
     json_out: bool = options.json_option(),
 ) -> None:
-    """Show your remaining account balance."""
+    """Show your remaining account balance"""
 
     def body(state: AppState, json_mode: bool) -> None:
         _, jwt = state.resolve_session()
@@ -183,17 +183,17 @@ def usage(
     ),
     end: str | None = typer.Option(None, "--end", help="End date (YYYY-MM-DD). Default: today."),
     window: str | None = typer.Option(
-        None, "--window", help="Window size: 'day', 'week', or 'month'."
+        None, "--window", help="Window size: 'day', 'week', or 'month'"
     ),
     include_zero: bool = typer.Option(
         False,
         "--include-zero",
         "--all",
-        help="Include zero-usage windows (matches --include-logins on `assembly audit`).",
+        help="Include zero-usage windows (matches --include-logins on `assembly audit`)",
     ),
     json_out: bool = options.json_option(),
 ) -> None:
-    """Show usage over a date range (defaults to the last 30 days)."""
+    """Show usage over a date range (default: last 30 days)"""
 
     def body(state: AppState, json_mode: bool) -> None:
         # Parse/validate the flags before any session resolution or network work,
@@ -270,7 +270,7 @@ def limits(
     ctx: typer.Context,
     json_out: bool = options.json_option(),
 ) -> None:
-    """Show your account's rate limits per service."""
+    """Show your account's rate limits per service"""
 
     def body(state: AppState, json_mode: bool) -> None:
         account_id, jwt = state.resolve_session()

aai_cli/commands/agent/__init__.py

@@ -53,7 +53,7 @@ def agent(
         None, help="Audio file path or URL to speak to the agent. Omit to use the microphone."
     ),
     sample: bool = typer.Option(
-        False, "--sample", help="Speak the hosted wildfires.mp3 sample to the agent."
+        False, "--sample", help="Speak the hosted wildfires.mp3 sample to the agent"
     ),
     voice: str = typer.Option(
         DEFAULT_VOICE,
@@ -62,32 +62,32 @@ def agent(
         autocompletion=complete_voice,
     ),
     system_prompt: str = typer.Option(
-        DEFAULT_PROMPT, "--system-prompt", help="System prompt (the agent's persona)."
+        DEFAULT_PROMPT, "--system-prompt", help="System prompt (the agent's persona)"
     ),
     system_prompt_file: Path | None = typer.Option(
         None,
         "--system-prompt-file",
-        help="Read the system prompt from a file (overrides --system-prompt).",
+        help="Read the system prompt from a file (overrides --system-prompt)",
         exists=True,
         dir_okay=False,
     ),
-    greeting: str = typer.Option(DEFAULT_GREETING, "--greeting", help="Spoken greeting."),
-    device: int | None = typer.Option(None, "--device", help="Microphone device index."),
-    list_voices: bool = typer.Option(False, "--list-voices", help="Print known voices and exit."),
-    json_out: bool = options.json_option("Emit newline-delimited JSON events."),
+    greeting: str = typer.Option(DEFAULT_GREETING, "--greeting", help="Spoken greeting"),
+    device: int | None = typer.Option(None, "--device", help="Microphone device index"),
+    list_voices: bool = typer.Option(False, "--list-voices", help="Print known voices and exit"),
+    json_out: bool = options.json_option("Emit newline-delimited JSON events"),
     output_field: choices.TextOrJson | None = typer.Option(
         None,
         "-o",
         "--output",
-        help="Output mode: text (you:/agent: lines as plain stdout, pipe-friendly) or json.",
+        help="Output mode: text (you:/agent: lines as plain stdout, pipe-friendly) or json",
     ),
     show_code: bool = typer.Option(
         False,
         "--show-code",
-        help="Print the equivalent Python SDK code and exit (does not start a session).",
+        help="Print the equivalent Python SDK code and exit (does not start a session)",
     ),
 ) -> None:
-    """Have a live two-way voice conversation with an AssemblyAI voice agent.
+    """Hold a live two-way voice conversation with a voice agent
 
     Use headphones: the mic stays open while the agent speaks, so on
     speakers it would hear itself and loop. Pass an audio file/URL (or

aai_cli/commands/audit.py

@@ -10,7 +10,7 @@
 from aai_cli.context import AppState, run_command
 from aai_cli.help_text import examples_epilog
 
-app = typer.Typer(help="View your account's audit log.")
+app = typer.Typer(help="View your account's audit log")
 
 SPEC = command_registry.CommandModuleSpec(
     panel=help_panels.ACCOUNT,
@@ -93,15 +93,15 @@ def _audit_rows(payload: Mapping[str, object]) -> list[dict[str, object]]:
 )
 def audit(
     ctx: typer.Context,
-    limit: int = typer.Option(20, "--limit", min=1, help="How many entries to show."),
-    action: str | None = typer.Option(None, "--action", help="Filter by raw action name."),
-    resource: str | None = typer.Option(None, "--resource", help="Filter by raw resource type."),
+    limit: int = typer.Option(20, "--limit", min=1, help="How many entries to show"),
+    action: str | None = typer.Option(None, "--action", help="Filter by raw action name"),
+    resource: str | None = typer.Option(None, "--resource", help="Filter by raw resource type"),
     include_logins: bool = typer.Option(
-        False, "--include-logins", help="Show successful login events."
+        False, "--include-logins", help="Show successful login events"
     ),
     json_out: bool = options.json_option(),
 ) -> None:
-    """List recent audit-log entries for your account."""
+    """List recent audit-log entries for your account"""
 
     def body(state: AppState, json_mode: bool) -> None:
         _, jwt = state.resolve_session()

aai_cli/commands/caption/__init__.py

@@ -44,32 +44,32 @@ def caption(
     media: str = typer.Argument(
         ...,
         help="Video to caption: a local file, or a YouTube/media-page URL "
-        "(the full video is downloaded via yt-dlp).",
+        "(the full video is downloaded via yt-dlp)",
     ),
     transcript_id: str | None = typer.Option(
         None,
         "--transcript-id",
         "-t",
-        help="Reuse an existing transcript of this media instead of transcribing it again.",
+        help="Reuse an existing transcript of this media instead of transcribing it again",
     ),
     chars_per_caption: int | None = typer.Option(
         None,
         "--chars-per-caption",
         min=1,
-        help="Max characters per caption line.",
+        help="Max characters per caption line",
     ),
     font_size: int | None = typer.Option(
         None,
         "--font-size",
         min=1,
-        help="Font size of the burned-in captions (ffmpeg's default styling when omitted).",
+        help="Font size of the burned-in captions (ffmpeg's default styling when omitted)",
     ),
     out: Path | None = typer.Option(
-        None, "--out", help="Output file (default: <name>.captioned<ext> next to the input)."
+        None, "--out", help="Output file (default: <name>.captioned<ext> next to the input)"
     ),
-    json_out: bool = options.json_option("Emit JSON describing the captioned file."),
+    json_out: bool = options.json_option("Emit JSON describing the captioned file"),
 ) -> None:
-    """Burn always-visible captions into a video.
+    """Burn always-visible captions into a video
 
     The video is transcribed (or an existing transcript is reused with
     --transcript-id), the transcript's SRT captions are fetched, and ffmpeg

aai_cli/commands/clip/__init__.py

@@ -61,22 +61,22 @@ def clip(
     media: str = typer.Argument(
         ...,
         help="Audio/video to cut clips from: a local file, or a YouTube/media-page "
-        "URL (audio downloaded via yt-dlp).",
+        "URL (audio downloaded via yt-dlp)",
     ),
     transcript_id: str | None = typer.Option(
         None,
         "--transcript-id",
         "-t",
         help="Reuse an existing transcript of this media instead of transcribing it again: "
-        "an id, or '-' to read an id or 'transcribe --json' output from stdin.",
+        "an id, or '-' to read an id or 'transcribe --json' output from stdin",
     ),
     speaker: list[str] = typer.Option(
         [],
         "--speaker",
-        help="Keep segments spoken by this diarized speaker label (repeatable, e.g. --speaker A).",
+        help="Keep segments spoken by this diarized speaker label (repeatable, e.g. --speaker A)",
     ),
     search: str | None = typer.Option(
-        None, "--search", help="Keep segments whose text contains this (case-insensitive)."
+        None, "--search", help="Keep segments whose text contains this (case-insensitive)"
     ),
     llm_prompt: str | None = typer.Option(
         None,
@@ -88,42 +88,42 @@ def clip(
     model: str = typer.Option(
         llm.DEFAULT_MODEL,
         "--model",
-        help="LLM Gateway model for --llm.",
+        help="LLM Gateway model for --llm",
         rich_help_panel=help_panels.OPT_LLM,
         autocompletion=llm.complete_model,
     ),
     max_tokens: int = typer.Option(
         llm.DEFAULT_MAX_TOKENS,
         "--max-tokens",
-        help="Max tokens for the --llm selection reply.",
+        help="Max tokens for the --llm selection reply",
         rich_help_panel=help_panels.OPT_LLM,
     ),
     ranges: list[str] = typer.Option(
         [],
         "--range",
-        help="Keep an explicit START-END window (seconds or [HH:]MM:SS; repeatable).",
+        help="Keep an explicit START-END window (seconds or [HH:]MM:SS; repeatable)",
     ),
     padding: float = typer.Option(
-        0.0, "--padding", min=0.0, help="Seconds of padding to add around each clip."
+        0.0, "--padding", min=0.0, help="Seconds of padding to add around each clip"
     ),
     snap: bool = typer.Option(
         True,
         "--snap/--no-snap",
         help="Snap clip boundaries into nearby silence (detected with ffmpeg) so cuts "
-        "don't land mid-word; --no-snap cuts at the exact selected times.",
+        "don't land mid-word; --no-snap cuts at the exact selected times",
     ),
     out_dir: Path | None = typer.Option(
-        None, "--out-dir", help="Directory for the clip files (default: next to the input)."
+        None, "--out-dir", help="Directory for the clip files (default: next to the input)"
     ),
     video: bool = typer.Option(
         False,
         "--video",
         help="Download the full video (not just the audio track) for a URL source, "
         "so the clips are cut from the video. Local files keep their video already.",
     ),
-    json_out: bool = options.json_option("Emit JSON describing the clips written."),
+    json_out: bool = options.json_option("Emit JSON describing the clips written"),
 ) -> None:
-    """Cut clips out of a media file by speaker, text match, LLM pick, or time range.
+    """Cut clips from media by speaker, text match, LLM pick, or time range
 
     --speaker and --search select from a diarized transcript (made on the fly,
     or reused with --transcript-id); --llm has an LLM Gateway model pick the

aai_cli/commands/config_cmd.py

@@ -26,7 +26,7 @@
 )
 
 app = typer.Typer(
-    help="Inspect and edit persisted CLI settings (profiles, env, telemetry).",
+    help="Inspect and edit persisted CLI settings (profiles, env, telemetry)",
     no_args_is_help=True,
 )
 
@@ -99,7 +99,7 @@ def path(
     ctx: typer.Context,
     json_out: bool = options.json_option(),
 ) -> None:
-    """Print where config.toml lives."""
+    """Print where config.toml lives"""
 
     def body(_state: AppState, json_mode: bool) -> None:
         file = config.config_file_path()
@@ -126,7 +126,7 @@ def list_settings(
     ctx: typer.Context,
     json_out: bool = options.json_option(),
 ) -> None:
-    """Show every persisted setting and the stored profiles."""
+    """Show every persisted setting and the stored profiles"""
 
     def body(_state: AppState, json_mode: bool) -> None:
         data: dict[str, object] = {
@@ -169,10 +169,10 @@ def render(d: dict[str, object]) -> object:
 )
 def get(
     ctx: typer.Context,
-    key: ConfigKey = typer.Argument(..., help="Which setting to read."),
+    key: ConfigKey = typer.Argument(..., help="Which setting to read"),
     json_out: bool = options.json_option(),
 ) -> None:
-    """Print one setting's stored value (`env` reads the selected profile's)."""
+    """Print one setting's stored value (`env` reads the selected profile's)"""
 
     def body(state: AppState, json_mode: bool) -> None:
         value = _current_value(key, state)
@@ -197,11 +197,11 @@ def body(state: AppState, json_mode: bool) -> None:
 )
 def set_setting(
     ctx: typer.Context,
-    key: ConfigKey = typer.Argument(..., help="Which setting to change."),
-    value: str = typer.Argument(..., help="The new value."),
+    key: ConfigKey = typer.Argument(..., help="Which setting to change"),
+    value: str = typer.Argument(..., help="The new value"),
     json_out: bool = options.json_option(),
 ) -> None:
-    """Change one setting (`env` writes to the selected profile)."""
+    """Change one setting (`env` writes to the selected profile)"""
 
     def body(state: AppState, json_mode: bool) -> None:
         stored = _store_value(key, value, state)

aai_cli/commands/deploy/__init__.py

@@ -31,14 +31,14 @@
 )
 def deploy(
     ctx: typer.Context,
-    prod: bool = typer.Option(False, "--prod", help="Deploy to production (Vercel only)."),
-    vercel: bool = typer.Option(False, "--vercel", help="Deploy to Vercel (the default)."),
-    railway: bool = typer.Option(False, "--railway", help="Deploy to Railway."),
-    fly: bool = typer.Option(False, "--fly", help="Deploy to Fly.io."),
-    assume_yes: bool = typer.Option(False, "--yes", "-y", help="Skip the confirmation prompt."),
+    prod: bool = typer.Option(False, "--prod", help="Deploy to production (Vercel only)"),
+    vercel: bool = typer.Option(False, "--vercel", help="Deploy to Vercel (the default)"),
+    railway: bool = typer.Option(False, "--railway", help="Deploy to Railway"),
+    fly: bool = typer.Option(False, "--fly", help="Deploy to Fly.io"),
+    assume_yes: bool = typer.Option(False, "--yes", "-y", help="Skip the confirmation prompt"),
     json_out: bool = options.json_option(),
 ) -> None:
-    """Deploy the current project to Vercel (default), Railway, or Fly.io.
+    """Deploy the current project to Vercel, Railway, or Fly.io
 
     Asks for confirmation first, then runs the target's CLI (`vercel deploy`,
     `railway up`, or `fly launch`). Requires that target's CLI to be installed.

aai_cli/commands/dev/__init__.py

@@ -33,19 +33,19 @@
 )
 def dev(
     ctx: typer.Context,
-    port: int = typer.Option(3000, "--port", help="Local server port."),
+    port: int = typer.Option(3000, "--port", help="Local server port"),
     host: str = typer.Option(
         devserver.LOCAL_HOST,
         "--host",
         help="Interface to bind. Loopback by default; pass 0.0.0.0 to expose on your network.",
     ),
-    no_open: bool = typer.Option(False, "--no-open", help="Launch, but don't open the browser."),
+    no_open: bool = typer.Option(False, "--no-open", help="Launch, but don't open the browser"),
     no_install: bool = typer.Option(
-        False, "--no-install", help="Skip dependency install; launch directly."
+        False, "--no-install", help="Skip dependency install; launch directly"
     ),
     json_out: bool = options.json_option(),
 ) -> None:
-    """Launch the dev server for the app in the current directory.
+    """Run the dev server for the app in the current directory
 
     Run this from inside a project created by `assembly init`. It installs dependencies
     if needed, then starts the FastAPI server with live reload and opens the browser.

aai_cli/commands/dictate/__init__.py

@@ -38,28 +38,28 @@ def dictate(
         None,
         "--language",
         help="ISO 639-1 language code, or a comma-separated list for "
-        "code-switching audio (default: en).",
+        "code-switching audio (default: en)",
     ),
     prompt: str | None = typer.Option(
         None,
         "--prompt",
-        help="Custom transcription prompt (overrides --language).",
+        help="Custom transcription prompt (overrides --language)",
     ),
     word_boost: list[str] | None = typer.Option(
-        None, "--word-boost", help="Bias recognition toward a term (repeatable)."
+        None, "--word-boost", help="Bias recognition toward a term (repeatable)"
     ),
-    device: int | None = typer.Option(None, "--device", help="Microphone device index."),
-    once: bool = typer.Option(False, "--once", help="Transcribe one utterance, then exit."),
+    device: int | None = typer.Option(None, "--device", help="Microphone device index"),
+    once: bool = typer.Option(False, "--once", help="Transcribe one utterance, then exit"),
     max_seconds: float = typer.Option(
         float(MAX_AUDIO_SECONDS),
         "--max-seconds",
-        help="Auto-stop a recording after this many seconds.",
+        help="Auto-stop a recording after this many seconds",
         min=1.0,
         max=float(MAX_AUDIO_SECONDS),
     ),
-    json_out: bool = options.json_option("Emit one JSON object per utterance."),
+    json_out: bool = options.json_option("Emit one JSON object per utterance"),
 ) -> None:
-    """Dictate with a hotkey: record the mic, get the transcript back instantly.
+    """Push-to-talk dictation: record the mic, get the transcript back
 
     Press Enter (or Space) to start recording and press it again to stop; the
     utterance is sent to the AssemblyAI Sync API and the transcript prints