What is add-voice-transcription?

A feature that turns WhatsApp voice notes into text using OpenAI's Whisper speech-recognition service, so the agent can read them.

Use it to receive and respond to transcribed WhatsApp voice messages in MatClaw.

It removes the need to listen to voice messages or manually type their contents before getting a response.

How DingyangLyu/MatClaw configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to DingyangLyu/MatClaw. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/DingyangLyu/MatClaw/main/.claude/skills/add-voice-transcription/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/DingyangLyu/MatClaw

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/dingyanglyu/matclaw/add-voice-transcription/github.svg)](https://agentmods.dev/skills/dingyanglyu/matclaw/add-voice-transcription)

Your own site

<a href="https://agentmods.dev/skills/dingyanglyu/matclaw/add-voice-transcription"><img src="https://agentmods.dev/badge/skills/dingyanglyu/matclaw/add-voice-transcription/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/dingyanglyu/matclaw/add-voice-transcription"><img src="https://agentmods.dev/badge/skills/dingyanglyu/matclaw/add-voice-transcription.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 38 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,064 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00038	$0.01064
Opus 5	$0.00019	$0.00532
Sonnet 5	$0.00008	$0.00213
Haiku 4.5	$0.00004	$0.00106

Measured 12d ago against content hash 63789c757d0e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

add-voice-transcription scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

The scan reads SKILL.md. This mod also ships 4 executable files (add/src/transcription.ts, modify/src/channels/whatsapp.test.ts, modify/src/channels/whatsapp.ts, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

2. Verify key works: `curl -s https://api.openai.com/v1/models -H "Authorization: Bearer $OPENAI_API_KEY" | head -c 200`

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

add-voice-transcription — 94% identical, 18 lines differ

.claude/skills/add-voice-transcription/SKILL.md · 142 lines

How it starts

The opening of the file, as written. The whole thing — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Add Voice Transcription

This skill adds automatic voice message transcription to MatClaw's WhatsApp channel using OpenAI's Whisper API. When a voice note arrives, it is downloaded, transcribed, and delivered to the agent as [Voice: <transcript>].

Phase 1: Pre-flight

Check if already applied

Read .matclaw/state.yaml. If voice-transcription is in applied_skills, skip to Phase 3 (Configure). The code changes are already in place.

Ask the user

Use AskUserQuestion to collect information:

AskUserQuestion: Do you have an OpenAI API key for Whisper transcription?

If yes, collect it now. If no, direct them to create one at https://platform.openai.com/api-keys.

Phase 2: Apply Code Changes

Run the skills engine to apply this skill's code package.

Initialize skills system (if needed)

If .matclaw/ directory doesn't exist yet:

npx tsx scripts/apply-skill.ts --init

Apply the skill

npx tsx scripts/apply-skill.ts .claude/skills/add-voice-transcription

This deterministically:

Adds src/transcription.ts (voice transcription module using OpenAI Whisper)
Three-way merges voice handling into src/channels/whatsapp.ts (isVoiceMessage check, transcribeAudioMessage call)
Three-way merges transcription tests into src/channels/whatsapp.test.ts (mock + 3 test cases)
Installs the openai npm dependency
Updates .env.example with OPENAI_API_KEY
Records the application in .matclaw/state.yaml

If the apply reports merge conflicts, read the intent files:

modify/src/channels/whatsapp.ts.intent.md — what changed and invariants for whatsapp.ts
modify/src/channels/whatsapp.test.ts.intent.md — what changed for whatsapp.test.ts

Validate code changes

npm test
npm run build

All tests must pass (including the 3 new voice transcription tests) and build must be clean before proceeding.

Phase 3: Configure

Get OpenAI API key (if needed)

If the user doesn't have an API key:

I need you to create an OpenAI API key:

Go to https://platform.openai.com/api-keys

Click "Create new secret key"

Give it a name (e.g., "MatClaw Transcription")

Copy the key (starts with sk-)

Cost: ~~$0.006 per minute of audio (~~$0.003 per typical 30-second voice note)

Read the full file on GitHub · 142 lines

Files

What ships with it

7 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

12d ago First seen · 142 lines · 38 tokens per session scan A 63789c757d0e

Subscribe to this mod's changes

add-voice-transcription is a skill published in the GitHub repository DingyangLyu/MatClaw (90 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 38 tokens to every session and 1,064 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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