DEV Community

W1 M5 - Voice with ElevenLabs

Gemini CLI 357 messages
by g00ds0ul
W1 M5 - Voice with ElevenLabs
You

<USER_REQUEST>
I want to move to the M5 phase in the @[docs/challenge/w1/build-plan.md] but I'm on the ElevenLabs free plan (no promo credits, the pool was empty). Keep API usage minimal: cache audio by text hash, stub ElevenLabs in all tests, add --no-voice, and fall back to text with a one‑line message on a missing key, quota error or network error. Use a default voice. Add "Voice by ElevenLabs" to the README.
</USER_REQUEST>
<ADDITIONAL_METADATA>
The current local time is: 2026-10-08T15:39:51+01:00.

The user has mentioned some items in the form @[ITEM]. Here is extra information about the items that were mentioned by the user, in the order that they appear:

@[docs/challenge/w1/build-plan.md] is a [File]:
[REDACTED_PATH][REDACTED_USER]-Hackerton\docs\challenge\w1\build-plan.md
</ADDITIONAL_METADATA>
<USER_SETTINGS_CHANGE>
The user changed setting Model Selection from None to Gemini 3.8 Flash (High). No need to comment on this change if the user doesn't ask about it. If reporting what model you are, please use a human readable name instead of the exact string.
</USER_SETTINGS_CHANGE>

Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent

plans/w1-M5-elevenlabs-voice.md

Verdict: READY FOR APPROVAL — Awaiting approval. I will not write code until you reply APPROVE.

Objections & Resolutions

  • O-1 (Serious - Audio player dependency fragility): Automated playback via external player libraries or elevenlabs.play() risks hanging or crashing in headless/terminal Windows environments lacking ffplay/mpv; Resolution: The M5 acceptance criterion explicitly allows printing the audio path ("plays it or prints its path"), so the implementation saves to audio/brief_<hash>.mp3 and prints the path without forcing fragile external playback subprocesses.
  • O-2 (Blocker - Audio files leaking into git commits): Synthesized audio files under audio/ could accidentally be committed, violating the acceptance criterion "No audio files or keys are committed"; Resolution: Step 1 explicitly adds audio/, *.mp3, and *.wav to w1-go-out-today/.gitignore before any audio is produced.
  • O-3 (Blocker - Uncontrolled API usage on free plan): Repeated runs and test executions could exhaust free tier quotas; Resolution: All unit tests stub ElevenLabs with monkeypatch (100% offline), identical plan texts reuse cached audio via SHA-256 text hash, and --no-voice allows running the morning brief without invoking TTS.

🌐 Community Wisdom: Optimizing ElevenLabs API Calls for Better Performance

Source: voice_developer
Tags: ai, programming, productivity, webdev

"Store the resulting MP3 in a cache using a deterministic key like a hash of the text and voice ID. Subsequent requests for the same prompt can be served instantly from disk, eliminating the round-trip to ElevenLabs entirely."

🔗 Read Full Discussion


Memory: 1 entries added (P-4)
Plan: plans/w1-M5-elevenlabs-voice.md - AWAITING APPROVAL

You

<USER_REQUEST>
APPROVE WITH CHANGES. I've updated docs/challenge/w1/build-plan.md. Re-read it, and quote all the M5 criteria in the scope check.

Voice-friendly text: speak "4 pm", not "16:00", with at most one number per window and about 40 words max. Update the facts and prompt, and make the M4 guard accept "4 pm" = 16:00. Add tests for this.
Word timings: use the with-timestamps endpoint and save brief_<hash>.json next to the MP3. If the free plan rejects it, fall back to plain convert and record that as a Deviation.
Model: use a Flash model if it's cheaper per character on the free plan. Check the pricing page and record the choice and the reason. Model ID comes from .env (ELEVENLABS_MODEL_ID) with a default.
Cache key = SHA‑256 of text + voice_id + model_id.
Atomic write: write to a .part file, then rename it only on success. A failed download is never cached.
Errors: separate one‑line messages for invalid key, quota exceeded, rate limit and network/timeout. Use a 30s timeout.
Interfaces: after uv add, verify convert / with-timestamps / ApiError in the installed SDK (path:line) and make one real call. Record the version and how many characters it used.
Add ELEVENLABS_API_KEY=, ELEVENLABS_VOICE_ID= and ELEVENLABS_MODEL_ID= (empty) to .env.example. Add a --play flag that opens the MP3 with os.startfile on Windows and prints the path elsewhere.
Move P‑4 to "Memory to write after approval". Add a "Later" section. Add a journal note that the promo pool was empty, so we're on the free plan.
</USER_REQUEST>
<ADDITIONAL_METADATA>
The current local time is: 2026-10-08T16:20:53+01:00.
</ADDITIONAL_METADATA>

Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent

I have implemented Milestone M5 (plans/w1-M5-elevenlabs-voice.md) per your instructions.

Summary of Changes

  1. Scope Check & Acceptance Criteria:
  2. SDK & Dependencies:
  3. Environment & Git Hygiene:
    • Added ELEVENLABS_API_KEY=, ELEVENLABS_VOICE_ID=, and ELEVENLABS_MODEL_ID= to .env.example:1-3.
    • Added audio/, *.mp3, *.wav, and *.part to .gitignore:6-9.
  4. Voice-Friendly Text & Guard Updates:
    • Added format_hour_12h converting 16:00 -> 4 pm, 06:00 -> 6 am, etc.
    • Updated facts in [src/w1_go_out_today/plan.py:26-170](file:///[REDACTED_PATH] <truncated 2109 bytes> lan text is always printed before voice generation.
  5. Live Verification & Character Count:
    • Real call: uv run python -X utf8 -c "from w1_go_out_today.voice import generate_voice; ..."
    • Text: "The best time for a walk is between 4 pm and 6 pm with a 15% chance of rain. Avoid being outside between 10 am and 2 pm due to an 81% chance of rain."
    • Characters consumed: 149 characters.
    • Output: Generated audio/brief_d52e80bbd603df2e.mp3 (186 KB) and audio/brief_d52e80bbd603df2e.json (5.1 KB with character timestamps).
    • Cache verification: Subsequent call returned [Cached] Audio: audio/brief_d52e80bbd603df2e.mp3 instantly with 0 API calls.
  6. Offline Unit Tests (tests/test_voice.py):
    • 13 offline unit tests covering cache hits, timestamps, fallback to convert, atomic .part cleanups, invalid keys, quota exceeded, rate limits, timeouts, network failures, --no-voice, and play_audio.
    • Entire suite: 37 passed in 8.89s (100% offline).
  7. Documentation & Journal:
    • README updated with "Voice by ElevenLabs", audio caching, --no-voice, and --play flags.
    • Checkpoint 5 recorded in journal/w1-go-out-today.md:68-76 documenting the empty promo pool and free plan constraints.

For Ise to confirm

  • uv run pytest: 37 passing tests.
  • uv run ruff check & uv run ruff format --check: clean.
  • uv run w1-go-out-today --help: displays --no-voice and --play.
  • uv run python -X utf8 -c "from w1_go_out_today.voice import generate_voice; generate_voice('The best time for a walk is between 4 pm and 6 pm with a 15% chance of rain. Avoid being outside between 10 am and 2 pm due to an 81% chance of rain.', play=True)" hits the cache and opens the brief.

Memory: no updates
Plan: plans/w1-M5-elevenlabs-voice.md - IMPLEMENTED - AWAITING ISE CONFIRMATION

You

<USER_REQUEST>
I have an issue concernign the m5 plan error test, a bad key gives 400 invalid_api_key and prints the full headers and body. Fix:

Map errors by the response body's detail.code / detail.status, not just the HTTP status. invalid_api_key → "Audio skipped: ElevenLabs API key is invalid (check .env)." Same idea for quota exceeded, rate limit and network/timeout.
Never print headers or the raw body. Unknown errors show Audio skipped: ElevenLabs error (<status>). The full details go to debug logging only.
Add a test using this exact 400 invalid_api_key response.
about the plan text, the best window said "only 15%", but the window ranges 15–37%. With one number per window, use the highest rain chance in the best window ("at most 37%"). Update the guard and add a test.

</USER_REQUEST>
<ADDITIONAL_METADATA>
The current local time is: 2026-10-08T17:04:04+01:00.
</ADDITIONAL_METADATA>

Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent

The ElevenLabs error mapping and best-window rain risk representation have been implemented and verified with regression tests.

Summary of Changes

  1. ElevenLabs Error Mapping & Header/Body Sanitization:
    • In w1-go-out-today/src/w1_go_out_today/voice.py:126-245:
      • Added logger = logging.getLogger(__name__) and routed all raw ApiError details, headers, body, network errors, and timeouts to logger.debug.
      • Inspected detail.status and detail.code (supporting both dict and string payloads).
      • Mapped invalid_api_key (including HTTP 400 responses) to: Audio skipped: ElevenLabs API key is invalid (check .env).
      • Mapped quota_exceeded / credit exhaustion to: Audio skipped: ElevenLabs free plan character quota exceeded.
      • Mapped rate_limit (including HTTP 429) to: Audio skipped: ElevenLabs API rate limit reached.
      • Mapped unknown ApiError to: Audio skipped: ElevenLabs error (<status_code>). Never leaks raw body, headers, or request IDs to stdout.
      • Hardened the inner convert_with_timestamps error handling to only fall back to plain convert on feature/tier unsupported issues, immediately propagating auth or quota errors to prevent duplicate calls.
    • Added regression unit tests in w1-go-out-today/tests/test_voice.py:219-272:
      • test_generate_voice_400_invalid_api_key: verifies exact 400 response with headers and body outputs the one-line invalid key message without leaking headers or request ID.
      • test_generate_voice_unknown_api_error_no_leaks: verifies 500 error outputs Audio skipped: ElevenLabs error (500). and leaks no secret headers or traces.
      • test_generate_voice_quota_detail_code: verifies detail.code == "quota_exceeded" outputs the quota exceeded message.

2.
<truncated 516 bytes>
9F%A4%A1/[REDACTED_USER]-Hackerton/w1-go-out-today/src/w1_go_out_today/plan.py#L182-L228):
- Updated extract_fact_numbers to extract strictly the numbers present in the facts block (time bounds and rain_max), excluding hidden intermediate rows and the understated minimum rain chance.
- In w1-go-out-today/src/w1_go_out_today/plan.py:320-350:
- Positioned avoid-window validation before number checks in validate_plan_output.
- In w1-go-out-today/src/w1_go_out_today/plan.py:368-372:
- Updated generate_fallback_template to state with at most {bw_rain_max}% chance of rain.
- In w1-go-out-today/prompts/plan.txt:15:
- Updated prompt constraint 8 example to (e.g. "at most a 37% chance of rain").
- Added unit tests in w1-go-out-today/tests/test_plan.py:333-353:
- test_best_window_uses_highest_rain_chance: verifies at most 37% is in the facts block and fallback template, and 15% is absent.
- test_guard_rejects_best_window_understated_rain: verifies plan text using only a 15% chance of rain is rejected by the guard.

  1. Verification:
    • uv run pytest: 42 passed in 8.59s (all unit tests 100% offline).
    • uv run ruff check & uv run ruff format --check: all clean.
    • python -X utf8 tools/check-memory.py: PASS (10 pass, 0 warn, 0 fail).
    • Updated Implementation Log and Deviations in plans/w1-M5-elevenlabs-voice.md:167-176.

Memory: no updates
Plan: plans/w1-M5-elevenlabs-voice.md - IMPLEMENTED - AWAITING ISE CONFIRMATION

You

<USER_REQUEST>
Did you also take note of the error handling for the network?
</USER_REQUEST>
<ADDITIONAL_METADATA>
The current local time is: 2026-10-08T17:12:30+01:00.
</ADDITIONAL_METADATA>

Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent

Yes, network and timeout error handling is implemented across both the HTTP transport layer and the API/gateway layer:

1. Dual-Layer Error Handling

  • API & Gateway Layer (src/w1_go_out_today/voice.py:228-267):

    • Mapped via detail.code / detail.status as well as HTTP status codes:
    • Timeout (status_code in (408, 504) or detail.code/status with "timeout"): Audio skipped: ElevenLabs API request timed out after 30s.
    • Gateway / Network Failure (status_code in (502, 503) or detail.code/status with "bad_gateway", "network_error", "service_unavailable"): Audio skipped: Unable to reach ElevenLabs API (network error: HTTP <status>).
    • Routes full response headers, request IDs, and body details strictly to logger.debug, completely hiding them from stdout.
  • HTTP Transport Layer (src/w1_go_out_today/voice.py:270-285):

    • Catches (httpx.TimeoutException, TimeoutError): Audio skipped: ElevenLabs API request timed out after 30s.
    • Catches (httpx.RequestError, ConnectionError, OSError): Audio skipped: Unable to reach ElevenLabs API (network error: <ErrorClass>).
    • Logs tracebacks to logger.debug with exc_info=True.

2. Cache Protection & Atomic Cleanup

  • Enforced a 30-second client timeout (timeout=httpx.Timeout(30.0)).
  • If a connection drops mid-stream during TTS generation, the finally: block unlinks any partial .part files (mp3_part.unlink(), json_part.unlink()), ensuring failed network transfers are never cached.
  • The CLI prints the full plan text and returns None, allowing execution to complete cleanly without crashing.

3. Unit Tests (tests/test_voice.py:158-208, 270-302):

  • test_generate_voice_timeout_error: verifies httpx.TimeoutException produces the clean 30s timeout message.
  • test_generate_voice_network_error: verifies httpx.NetworkError produces the clean network error message without leaking URLs or headers.
  • test_generate_voice_apierror_timeout: verifies an HTTP 504 ApiError with detail: {"code": "gateway_timeout"} maps to the timeout message.
  • test_generate_voice_apierror_bad_gateway: verifies an HTTP 502 ApiError with detail: {"status": "bad_gateway"} maps to Audio skipped: Unable to reach ElevenLabs API (network error: HTTP 502).
  • test_generate_voice_atomic_part_cleanup_on_failure: verifies that any .part file left behind on an aborted network stream is cleaned up.

All 44 tests pass offline (uv run pytest), and lint/format checks are clean (uv run ruff check).

Memory: no updates
Plan: plans/w1-M5-elevenlabs-voice.md - IMPLEMENTED - AWAITING ISE CONFIRMATION

You

<USER_REQUEST>
Okay update the journal and save this session
</USER_REQUEST>
<ADDITIONAL_METADATA>
The current local time is: 2026-10-08T17:23:35+01:00.
</ADDITIONAL_METADATA>

Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent

The journal has been updated and the session has been saved privately to DEV.

1. Journal Updated (journal/w1-go-out-today.md:68-75)

  • Documented Milestone M5 execution under the ElevenLabs free tier constraints (Flash v2.5 model at 0.5 credits/char, caching via SHA-256 hash with atomic .part writing, 149 characters consumed on the single live test call, 44 offline tests passing).
  • Recorded the error handling fixes: mapped all error branches by detail.code / detail.status (handling HTTP 400 invalid_api_key, quota limits, rate limits, timeouts, and network gateways), sanitized user-facing messages, and routed headers/raw bodies strictly to debug logging.
  • Recorded the weather risk fix: updated the best window rain description from the understated minimum ("only 15%") to the window's ceiling ("at most 37%"), updating facts, prompt, fallback template, and guard checks.
  • Linked the private DEV session.

2. Session Saved to DEV

Memory: no updates
Plan: plans/w1-M5-elevenlabs-voice.md - IMPLEMENTED - AWAITING ISE CONFIRMATION
Session: https://dev.to/agent_sessions/w1-m5-voice-with-elevenlabs-jqwqwa (private)

You

<USER_REQUEST>
Why does dev relay redacted tool didn't remove my user path name like before, still shows my system user path name which is a sensitive info
</USER_REQUEST>
<ADDITIONAL_METADATA>
The current local time is: 2026-10-08T17:30:11+01:00.
</ADDITIONAL_METADATA>

Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent
Agent