Magnitude: A Fully Local and Private Terminal AI Agent

X postTom GreenwaldTool

Tom Greenwald introduced Magnitude, an open-source terminal AI agent designed to run models entirely on the user's local machine without third-party cloud APIs, external token costs, or remote data transfer.

Key points

  1. Runs completely offline with an integrated inference engine, keeping prompts, files, and secrets off external servers like OpenAI or Anthropic.
  2. Requires no API keys and eliminates token costs.
  3. Profiles host hardware automatically to recommend compatible local models balancing speed, memory, and output quality.
  4. Supports shell commands, file modifications, and script execution out of the box.
  5. Can be expanded with skills to interact with Chrome, PDFs, Excel, and PowerPoint files.
  6. Installs directly from the command line using 'npm i -g @magnitudedev/cli'.

Why it matters

While many developer agents run on a local workstation, their underlying inference frequently relies on cloud models, exposing proprietary source code and sensitive data. Magnitude delivers a self-contained alternative suitable for strict privacy and compliance requirements.

Analysis

By embedding model execution straight into the CLI agent, Magnitude abstracts away the complex configuration usually associated with self-hosted LLM backends. The automated hardware profiling lowers friction for developers seeking private, local automation for tasks like log reviews and confidential data processing.

Original post

Tom Greenwald

@tomgreenwald · 7 August 2026

Introducing Magnitude: your actually local agent 100% private and offline. No token costs, no API keys. Open source. Today's agents are local. The model isn't. Every prompt, every file, every secret gets sent straight to Anthropic and OpenAI. Magnitude is built around local t.co/G5OeiDwUYu

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