nanoflash: Skill for Claude Code

.claude/skills/use-local-whisper/SKILL.md

use-local-whisper is a skill for Claude Code from refactornator/nanoflash. It costs 46 tokens per session (1,286 once invoked), scanned A, a copy of use-local-whisper, MIT.

A setup for transcribing WhatsApp voice messages on an Apple Silicon Mac using Whisper.cpp, a local speech-to-text program.

In plain words
What is it for?
Use it to switch WhatsApp transcription to local processing when the required voice-transcription setup, software, and model are installed.
Why use it?
It keeps audio processing on the device, so the transcription does not need an API key, network access, or per-use fees.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

This is refactornator/nanoflash's own configuration. It tells Claude Code how to work on nanoflash itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything nanoflash configures →

Reuse

Borrowing it

Nothing to install: this file belongs to refactornator/nanoflash. 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/refactornator/nanoflash/main/.claude/skills/use-local-whisper/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/refactornator/nanoflash

Made for: Claude Code.

Wrote this? Show the measurements

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README.md
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<a href="https://agentmods.dev/skills/refactornator/nanoflash/use-local-whisper"><img src="https://agentmods.dev/badge/skills/refactornator/nanoflash/use-local-whisper.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,286 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 92% copy Near-identical to another mod 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00046 $0.01286
Opus 5 $0.00023 $0.00643
Sonnet 5 $0.00009 $0.00257
Haiku 4.5 $0.00005 $0.00129

Measured 10d ago against content hash d43b570be974, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

use-local-whisper 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 10d ago.

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.

curl -L -o data/models/ggml-base.bin "https://huggingface.co/ggerganov/whisper.cpp/resolve/main/ggml-base.bin"
Origin

This is a copy

92% identical to use-local-whisper — 16 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/skills/use-local-whisper/SKILL.md · 153 lines

How it starts

The opening of the file, as written. The whole thing — 153 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Use Local Whisper

Switches voice transcription from OpenAI's Whisper API to local whisper.cpp. Runs entirely on-device — no API key, no network, no cost.

Channel support: Currently WhatsApp only. The transcription module (src/transcription.ts) uses Baileys types for audio download. Other channels (Telegram, Discord, etc.) would need their own audio-download logic before this skill can serve them.

Note: The Homebrew package is whisper-cpp, but the CLI binary it installs is whisper-cli.

Prerequisites

  • voice-transcription skill must be applied first (WhatsApp channel)
  • macOS with Apple Silicon (M1+) recommended
  • whisper-cpp installed: brew install whisper-cpp (provides the whisper-cli binary)
  • ffmpeg installed: brew install ffmpeg
  • A GGML model file downloaded to data/models/

Phase 1: Pre-flight

Check if already applied

Check if src/transcription.ts already uses whisper-cli:

grep 'whisper-cli' src/transcription.ts && echo "Already applied" || echo "Not applied"

If already applied, skip to Phase 3 (Verify).

Check dependencies are installed

whisper-cli --help >/dev/null 2>&1 && echo "WHISPER_OK" || echo "WHISPER_MISSING"
ffmpeg -version >/dev/null 2>&1 && echo "FFMPEG_OK" || echo "FFMPEG_MISSING"

If missing, install via Homebrew:

brew install whisper-cpp ffmpeg

Check for model file

ls data/models/ggml-*.bin 2>/dev/null || echo "NO_MODEL"

If no model exists, download the base model (148MB, good balance of speed and accuracy):

mkdir -p data/models
curl -L -o data/models/ggml-base.bin "https://huggingface.co/ggerganov/whisper.cpp/resolve/main/ggml-base.bin"

For better accuracy at the cost of speed, use ggml-small.bin (466MB) or ggml-medium.bin (1.5GB).

Phase 2: Apply Code Changes

Ensure WhatsApp fork remote

git remote -v

If whatsapp is missing, add it:

git remote add whatsapp https://github.com/qwibitai/nanoclaw-whatsapp.git

Read the full file on GitHub · 153 lines

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.

  1. 10d ago First seen · 153 lines · 46 tokens per session scan A d43b570be974

Subscribe to this mod's changes

use-local-whisper is a skill published in the GitHub repository refactornator/nanoflash (5 stars, last pushed 4mo ago), licensed MIT. It adds 46 tokens to every session and 1,286 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 92% identical to use-local-whisper, differing in 16 lines, and is treated as a copy.

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