Work
Work
What Mac Anderson builds and has built. Oxagen, Stella, Arena, the Context Graph Protocol, his career from Fonteva to Oxagen, his patent and awards, and his GitHub activity.
Highlights
- Patent, 2019US 10,489,133Sole inventor of the patent for the Fonteva Framework, the platform Fonteva's apps run on.fonteva.com
- Acquisition, 2021Togetherwork acquires FontevaThe company Mac co-founded in 2010 and led as CTO for eleven years.fonteva.com
- Inc. 5000, 2021No. 3402, eighth year in a rowFonteva on Inc.'s list of the fastest-growing private companies in America.fonteva.com
- Stevie Awards, 2019Most Innovative CompanyBronze at the American Business Awards for Fonteva.fonteva.com
GitHub activity
Read from GitHub October 30, 2026 at 2:02 PM PDT- Contributions since 26 Feb 2026
- 30,919
- Contributions in all of 2025
- 38
- Merged pull requests
- 8,191
- Most in one day
- 1,144
- stella★ 18A coding agent that builds it's own tools and mines it's own skills and always ships with receipts.Rust
- arena★ 1Wire up a Harbor benchmark adapter and run your coding agent side-by-side with industry-leading agents. Arena adds regression checks so your agent keeps improving instead of drifting or degrading, and shows — fairly and without bias — how it stacks up against Claude Code, Gemini, and other top code agents.TypeScript
- contextgraphprotocol★ 1The Context Graph Protocol is an open wire protocol for context retrieval. It treats a piece of context as a typed, budgeted, provenance-carrying, consent-gated, and conformance-verified unit of exchange called a frame — never a blob.Rust
- claude-code-plugin★ 1Connect Claude Code to your Oxagen workspace — typed ontology access, durable agent memory, multi-agent coordination, and 50+ slash commands. Engineered for code, but the same surface powers incident response, security triage, customer-impact analysis, and research workflows.Shell
- dotfiles★ 1Mac Anderson's new machine dotfiles and setup & installer scripts.Shell
- stella-examples★ 1Examples for the Stella CLI — settings profiles, lifecycle hooks, custom agents, commands, tools, skills, MCP config, and fleet workflowsRust
Languages in public repositories
- Rust74.8%
- Python13%
- Shell3.8%
- TypeScript2.7%
- MDX2.2%
- HTML1.6%
Language shares compare the bytes of code GitHub finds in each language across Mac's own public repositories, forks left out.
Mac Anderson is the founder and CEO of Oxagen, and its principal engineer and architect. He is also the creator of Stella, Arena, and the Context Graph Protocol. Before Oxagen he co-founded Fonteva, which Togetherwork acquired in 2021, and founded inTown Technologies.
Oxagen#
Oxagen is workforce management for autonomous agents. You give each agent its own identity. You set its authority, budget, tools, and skills in one mandate. For actions routed through Oxagen, the agent asks, a rule your team wrote answers, and Oxagen records the answer with its cost. A mandate has four parts:
- Access: the identity the agent acts as, and what it may request.
- Budget and rules: what it may spend, and the rules it works under.
- Equipment: the tools, skills, and business context it may use.
- Record: what each governed run read, changed, and cost, and which rule answered each request.
Oxagen does not run agents. It wraps the ones teams already use, such as Claude Code and Codex, through hooks installed beside the agent and a gateway for model calls.
Stella#
Stella is a fast, model-agnostic terminal coding agent written in Rust. You bring your own model key. Its definition of done is a witness test: a test that fails on the old code and passes on the new code. Its core is one loop with five tools, and everything else is a plugin. On Terminal-Bench 2.1 on 31 July 2026, with both agents on the same GLM model, Stella solved 58 of 89 tasks and Claude Code solved 44. Stella is open source under the AGPL. Install it with brew install oxageninc/stella/stella, and read the docs at stella.oxagen.sh.
Arena#
Arena (source) runs your coding agent head to head against Claude Code, Gemini, and other agents, with regression checks that keep it improving instead of drifting.
Context Graph Protocol#
The Context Graph Protocol (CGP) is an open specification for representing, exchanging, and accounting for an agent's context as a typed graph of frames instead of loose text. It ships with JSON schemas, a conformance suite, and SDKs for TypeScript, Python, and Go.
Other open source#
- stella-lang: a programming language written by AI agents for AI agents.
- token-tax-meter: measures what each model actually bills for the same sentence in six languages.
- rainforest: a proving ground. A supply-chain app specified in markdown and issues, built on its own by Stella.
- arena-bench: a loop-integrity benchmark for coding agents, with kill-and-resume chaos tests and execution-trace checks.
Career#
- 2026 to now. Oxagen, founder and CEO. Mac founded Oxagen in 2026 and is its principal engineer and architect. He builds the agent control plane, Stella, and the Context Graph Protocol.
- 2024 to 2026. The Unnatural Group, director of AI and machine learning engineering. In Los Angeles he built the firm's AI and machine learning team and its trading systems, including LSTM pricing models and retrieval over a Neo4j knowledge graph.
- 2021 to 2024. inTown Technologies, founder and CTO. In Washington, DC, he built software for city governments, including a multi-agent LLM system that answers residents' requests.
- 2010 to 2021. Fonteva, co-founder and CTO. Mac co-founded Fonteva in 2010 with Jerry Huskins and Paul Lundy. Fonteva built membership, events, and commerce software for associations, native to Salesforce. As CTO he built the engineering team and the platform. In 2017 Fonteva's revenue grew 71% to $12.8 million, and it had more than 100 employees. The Washington Business Journal ranked it 24th among the region's fastest-growing companies in 2018, and the U.S. Small Business Administration named it Small Business Exporter of the Year for the Washington area. He is the sole inventor on Fonteva's patent for its platform, US 10,489,133. Togetherwork acquired Fonteva in February 2021.
- Before 2010. Wipro, senior technical architect. He led architecture for enterprise Salesforce Service Cloud implementations.
Patents and awards#
- US Patent 10,489,133 B2: Software platform providing deployment and configuration settings for a second platform. Mac is the sole inventor, listed under his legal name, Thomas M. Anderson. Fonteva holds the patent. It was filed on 17 June 2015 and granted on 26 November 2019. It covers a software platform built on another platform's deployment and configuration settings, so apps on it can be updated without reinstalling software. Fonteva announced it as the patent for the Fonteva Framework.
- Inc. 5000, 2021. Fonteva ranked No. 3402 on the Inc. 5000, Inc.'s list of the fastest-growing private companies in America. It was Fonteva's eighth year in a row on the list.
- Stevie American Business Awards, 2019. Fonteva won bronze for Most Innovative Company of the Year.
- Acquisition, 2021. Togetherwork acquired Fonteva in February 2021.
Talks#
- Dreamforce 2014: "Design Patterns Every ISV Needs to Know," with Andrey Volosevich of Salesforce and Ross Belmont of Appiphony.