babysor/MockingBird · critical · RuntimeError

kokoro-tts CLI not found.

Error message

kokoro-tts CLI not found.

What it means

RuntimeError raised by _ensure_kokoro when the kokoro-tts CLI is not on PATH. The Kokoro local TTS backend shells out to this binary for every cue, so its absence is fatal for that backend.

Solutions

1. pip install kokoro-tts (or the documented package) into the active environment
2. Verify: which kokoro-tts
3. Or switch the timeline config's backend to noiz
4. Activate the correct virtualenv before running render_timeline

Example fix

# before
$ python render_timeline.py ...  # backend kokoro, CLI missing
# after
$ pip install kokoro-tts && which kokoro-tts
$ python render_timeline.py ...

import shutil
if backend == 'kokoro' and not shutil.which('kokoro-tts'):
    sys.exit('kokoro-tts CLI not installed; run pip install kokoro-tts')

When it happens

Trigger: Selecting the kokoro backend in the timeline config without having installed the kokoro-tts CLI, or running in an environment where its install dir isn't on PATH.

Common situations: Fresh machine, virtualenv where kokoro-tts was installed in a different env, or CI container missing the tool.

Related errors

• ffmpeg not found in PATH.
• kokoro-tts failed for cue
• Package 'webrtcvad' not found. This package enables noise…
• reference_audio not found
• Reference audio not found

AI-assisted analysis of babysor/MockingBird@28dc5e14f1 (2026-08-27). Data as JSON: /api/errors/95fec2857c3b679f. Report an issue: GitHub.

Appendix: source

Thrown at skills/speak/scripts/render_timeline.py:312

        if ref_cleanup is not None:
            ref_cleanup.unlink(missing_ok=True)

    if resp.status_code != 200:
        raise RuntimeError(
            f"/text-to-speech cue {cue.index}: "
            f"status={resp.status_code}, body={resp.text}"
        )
    out_path.write_bytes(resp.content)
    dur_h = resp.headers.get("X-Audio-Duration")
    return float(dur_h) if dur_h else -1.0


# ── Kokoro backend ───────────────────────────────────────────────────


def _ensure_kokoro() -> None:
    if not shutil.which("kokoro-tts"):
        raise RuntimeError("kokoro-tts CLI not found.")


def _kokoro_tts(
    cue: Cue,
    cfg: Dict[str, Any],
    output_format: str,
    out_path: Path,
) -> float:
    with tempfile.NamedTemporaryFile(
        mode="w", suffix=".txt", delete=False, encoding="utf-8"
    ) as tmp:
        tmp.write(cue.text)
        tmp_path = tmp.name

    try:
        cmd = ["kokoro-tts", tmp_path, str(out_path)]
        voice = cfg.get("voice")
        if voice:

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