The Download: Copilot Coding Agent, GitHub Models Tab & Firefox on GitHub

Key Concepts

• Open Source
• GitHub Copilot Chat Extension
• VS Code Core
• Firefox on GitHub
• Appwrite Sites
• GitHub Copilot Coding Agent
• GitHub Models
• Agent Mode
• AI Dev Tools
• Backend-as-a-Service (BaaS)
• Large Language Models (LLMs)

Open Source Updates

• VS Code & GitHub Copilot Chat Extension: Microsoft is open-sourcing the GitHub Copilot Chat extension under the MIT license. They are also refactoring key AI features directly into VS Code Core, aiming to create the first fully open-source AI code editor. The prompt test infrastructure will also be open-sourced, allowing community contributions through pull requests (PRs) that are properly tested and reviewable. The goal is to involve the community in shaping AI dev tools from within VS Code.
• Firefox on GitHub: Mozilla has mirrored the entire Firefox browser codebase to GitHub. This move is designed to make it easier for developers to explore, fork, and contribute to the project. While the primary development workflow remains on Bugzilla and Mercurial, GitHub provides easier access for reading and collaboration. Developers can now easily access the internals of Firefox features like tab management, rendering, and browser security via git clone.
• Appwrite Sites: Appwrite, an open-source backend-as-a-service, has introduced built-in hosting. This allows developers to deploy frontend applications on the same platform used for authentication, databases, functions, storage, and messaging. Appwrite is now a full-stack, self-hostable alternative, fully open-source and containerized.

GitHub AI News

• GitHub Copilot Coding Agent: The GitHub Copilot coding agent is now in public preview, announced at Microsoft Build 2025. This agent can be assigned an open issue, and it will plan, write, test, and open a pull request using GitHub Actions. It leverages Microsoft’s AI infrastructure to understand the repository context. Users retain control through review tools, comment guidance, and IDE editing. It is available to Copilot Pro and Enterprise users. This goes beyond code suggestions to autonomous PRs with human oversight.
• GitHub Models: GitHub Models is also in public preview. It adds a "Models" tab to repositories, allowing teams to run side-by-side evaluations of large language models (LLMs). This includes version-controlled prompts, access policies, and data control, all within the GitHub infrastructure. An example use case is evaluating LLMs for a chatbot feature.
• Agent Mode Expansion: Agent Mode now works across more IDEs, including JetBrains, Eclipse, and Xcode. This ensures that the agent is available wherever the developer is coding. The agent provides full repository context, acting as an AI teammate rather than just an autocomplete tool.

Conclusion

The episode of The Download highlights significant advancements in open source and AI-powered development tools. Key takeaways include Microsoft's commitment to open-sourcing AI dev tools within VS Code, Mozilla's move to make Firefox more accessible on GitHub, and Appwrite's expansion into full-stack hosting. The introduction of the GitHub Copilot coding agent and GitHub Models represents a significant step towards autonomous software development with human oversight, while the expansion of Agent Mode ensures AI assistance is available across various IDEs. These updates aim to empower developers with more accessible, collaborative, and intelligent tools.