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What is Muse Code?

Muse Code is Meta’s terminal-based AI coding agent built to take on complex software engineering tasks across large repositories. The agent is powered by Muse Spark 1.2 and is designed to plan code changes, write implementation code, validate results, and support end-to-end developer workflows. Muse Code can coordinate multiple persistent subagents for each task, helping solve difficult problems faster and with less manual intervention. Its architecture uses a simple agent loop enhanced by async background agents that remain active for the full session instead of being spawned only for individual steps. These background agents reduce repeated information gathering, carry out next actions, and communicate back to the main agent when useful. Muse Code’s runtime uses a local event log where model calls, tool runs, approvals, and edits are continuously appended. This event log serves as a single source of truth, making the runtime replay-exact and restart-safe if a crash or interruption occurs. The design allows Muse Code to handle long-running development work without losing progress or context. Muse Code includes bundled skills such as /plan for approval-gated task planning, /grill for stress-testing plans, and /goal for working toward successful completion of a defined objective. Example workflows include interpreting a video input, understanding the requested output, and producing a rich software experience such as a vacation home marketing and booking page. By combining terminal execution, autonomous planning, persistent background agents, replay-safe runtime design, bundled skills, and Muse Spark 1.2 model support, Muse Code helps developers complete ambitious coding tasks with greater reliability.

What is GSD 2?

GSD 2 is an AI development framework built to make software engineering with AI agents more structured, reliable, and practical. The framework helps teams move beyond basic chat-based coding assistance by introducing a clearer process for defining work, managing context, executing tasks, and validating results. It focuses on turning software requests into organized workflows that AI agents can follow with less ambiguity. GSD 2 supports the use of persistent artifacts, specifications, work contracts, traceability, and review steps to improve the quality of AI-assisted development. This makes it useful for teams that want to reduce the gap between what they asked an agent to build and what actually gets implemented. The framework also encourages developers to maintain oversight, helping prevent overreliance on generated code or documentation. By emphasizing context management, GSD 2 can help AI agents make better decisions based on the project’s goals, constraints, and existing codebase. Its process-driven approach is especially valuable for complex projects where unclear prompts can lead to inconsistent or incomplete results. Teams can use GSD 2 to organize planning, execution, testing, and review in a way that fits real software delivery workflows. The framework reflects a broader shift in AI software development from prompt experimentation toward repeatable engineering systems. GSD 2 helps developers and organizations make AI coding agents more useful, accountable, and aligned with production-quality development practices.

Media

Media

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Integrations Supported

Meta AI
Muse Glimmer
Muse Spark
Muse Spark 1.1
Muse Spark 1.2
Muse Spark 1.3
Muse Wonder
Muse Wonder Full

Integrations Supported

Kimchi

API Availability

Has API

API Availability

Pricing Information

$1.25 per 1M tokens (input)
Standard pricing: $1.25 per million input tokens and $4.25 per million output tokens

Discounted "contributor" tier costing $0.10 per million input tokens and $0.20 per million output tokens for users who agree to share feedback to improve the AI.
Free Version

Pricing Information

Free
Open source
Free Version

Supported Platforms

Windows
Mac
Linux

Supported Platforms

Windows
Mac
Linux

Customer Service / Support

Web-Based Support

Customer Service / Support

Not specified

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

Meta

Date Founded

2004

Company Location

United States

Company Website

meta.ai

Company Facts

Organization Name

Open GSD

Date Founded

2026

Company Website

github.com/gsd-build/gsd-2

Categories and Features

AI Coding Agents

Not specified

Categories and Features

AI Coding Agents

Not specified

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