DeepSeek Harness Voice Context

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DeepSeek Harness Voice Context is a voice-enabled distribution of DeepSeek Harness. It adds first-party browser recording, trusted Host-side transcription routing, an OpenAI-compatible local speech-to-text server, and a first-use settings flow for choosing cloud or offline models.

This project inherits DeepSeek Harness's developer-preview status. Interfaces and configuration may change before a stable release.

Highlights

• Record speech from the Web composer and insert the transcript into the draft without sending a message automatically.
• Choose a cloud API or a fully local offline backend from the Voice-Context settings page.
• Use FunASR iic/SenseVoiceSmall for fast Chinese transcription or faster-whisper small, medium, and large-v3 for multilingual workloads.
• Route browser audio through the existing Typert Remote and /api trust boundary; the browser cannot supply an arbitrary upstream URL.
• Store the cloud API key through the credentials service instead of browser storage or client responses.
• Expose an OpenAI-compatible POST /v1/audio/transcriptions endpoint for DeepSeek Harness and other compatible clients.
• Keep one local model resident at a time so switching model sizes does not retain every model in memory.
• Preserve ordinary DeepSeek Harness sessions, plugins, tools, and Web UI behavior.

Architecture

Voice Context follows the repository's “everything is a plugin” design. The browser owns recording and the user's backend/model preference; the Host owns trusted URLs, credentials, payload limits, and upstream requests.

flowchart LR
    A["Browser microphone"] --> B["16 kHz mono WAV"]
    B --> C["Typert Remote over /api"]
    C --> D["VoiceContextService"]
    D -->|"local"| E["Local STT server"]
    D -->|"cloud"| F["SiliconFlow API"]
    E --> G["Transcript"]
    F --> G
    G --> H["Composer draft"]

The Host package is documented in the Voice Context package README, while the client package README owns browser recording and settings behavior. The selectable-backends Agent Note records the architectural decision.

Model choices

Model weights are deliberately excluded from Git. A clone contains the server and download helper, not multi-gigabyte .pt, .bin, or cache files.

Quick start

Prerequisites

• Node.js ^22.19.0 or >=24.0.0 and Corepack/pnpm 11.7.0.
• Python 3.9 or newer for local transcription.
• A microphone-capable browser for voice input.
• A DeepSeek API key for agent conversations; a SiliconFlow key is required only for cloud transcription.

1. Clone and build

git clone https://github.com/CharlesLiuZC/deepseek-harness-voice-context.git
cd deepseek-harness-voice-context
corepack enable
corepack prepare pnpm@11.7.0 --activate
pnpm install
pnpm run build

2. Configure agent credentials

Copy .env.example to .env, then add DEEPSEEK_API_KEY. Add SILICONFLOW_API_KEY only when you plan to use the cloud transcription backend.

Copy-Item .env.example .env

cp .env.example .env

The .env file is ignored by Git. Never commit real credentials.

3. Start the local transcription server

Windows:

cd packages\voice\voice-context\local\funasr
start.bat

Linux or macOS:

cd packages/voice/voice-context/local/funasr
bash start.sh

The first run creates .venv, installs FunASR, CPU torch, and faster-whisper, then starts http://127.0.0.1:8000. SenseVoiceSmall downloads through FunASR on its first transcription.

To install one or more faster-whisper models, run the download helper in a second terminal after the virtual environment exists:

.venv\Scripts\python download_models.py small
.venv\Scripts\python download_models.py medium large-v3
# Or download every supported Whisper model:
.venv\Scripts\python download_models.py all

.venv/bin/python download_models.py small
.venv/bin/python download_models.py medium large-v3
# Or download every supported Whisper model:
.venv/bin/python download_models.py all

Downloaded files stay under local/funasr/models/, which is ignored by Git. See the local server guide for the API, environment variables, storage, and security details.

4. Start DeepSeek Harness Web

From the repository root:

pnpm dsh web

Open http://127.0.0.1:3080, enter Settings → Voice-Context, choose Local offline or Cloud API, select a model, and save the voice configuration. The microphone button then uses that selection for each finished recording.

Configuration

Backend and model selection

The settings page stores only an allowlisted backend/model pair in browser local storage. Local requests always resolve to 127.0.0.1:<localPort> on the Host. Cloud requests resolve to the configured non-loopback provider origin, with SiliconFlow as the bundled default.

Cordis plugin configuration

The Web bundle already mounts both Voice Context packages. A deployment override can configure the Host entry as follows:

- id: voice-context
  name: '@deepseek-ai/dsh-voice-context'
  config:
    baseUrl: https://api.siliconflow.cn
    model: FunAudioLLM/SenseVoiceSmall
    language: zh
    localPort: 8000
    apiKeyEnv: SILICONFLOW_API_KEY

baseUrl configures the cloud provider. Explicit local requests use localPort and never send a bearer credential to loopback.

Local server environment variables

OpenAI-compatible API

The local server accepts the standard multipart transcription request and exposes the installed model list:

curl http://127.0.0.1:8000/v1/audio/transcriptions \
  -F "file=@audio.wav" \
  -F "model=medium" \
  -F "language=zh"

curl http://127.0.0.1:8000/v1/models
curl http://127.0.0.1:8000/health

The transcription response includes at least text and model; faster-whisper responses also report the detected language.

Repository layout

apps/web/                                      Web application
packages/bundle/web-app/                       Default Web plugin composition
packages/voice/voice-context/                  Host STT service and local server
packages/client/ui-voice-context/              Browser microphone and settings UI
packages/voice/voice-context/local/funasr/     Dual-engine OpenAI-compatible STT server
docs/                                          Architecture and subsystem documentation
.agents/notes/                                 Implemented design decisions

The repository retains the upstream monorepo because Voice Context is integrated through first-party Cordis packages rather than maintained as a disconnected patch.

Development and verification

# Focused Voice Context tests
pnpm exec vitest run \
  packages/voice/voice-context/tests \
  packages/client/ui-voice-context/tests

# Static, build, and documentation checks
pnpm run lint:contracts-ready
pnpm run build
pnpm run doc-sync

Use python -m compileall -q packages/voice/voice-context/local/funasr to check the local server scripts without loading model weights.

Security and limitations

• The local server has no authentication and binds to loopback by default. If STT_HOST=0.0.0.0 exposes it to a LAN, place authentication and transport security in front of it.
• The browser sends base64 audio through JSON; the Host rejects payloads above the configured maxBytes limit, which defaults to 25 MiB.
• Cloud transcription sends recorded audio to the configured provider. Local mode keeps transcription audio on the machine.
• Only allowlisted model ids are accepted. Client-supplied filesystem paths and arbitrary remote repository names are rejected.
• The local server serializes inference and keeps one model resident. The first request after switching to medium or large-v3 can take longer while the model loads.

Contributing

See CONTRIBUTING.md for repository workflow and AGENTS.md for project-specific engineering rules. Bug reports and focused pull requests are welcome in this repository.

License and acknowledgements

This project is distributed under the MIT License. It is based on DeepSeek Harness, uses Cordis, and integrates FunASR/SenseVoice and faster-whisper through their public Python interfaces. Third-party notices are listed in THIRD_PARTY_NOTICES.md.