C0: CodeMate AI - Your Smartest Full Stack Coding Agent- Python, C++, C, Java, Javascript, Typescript, Ruby & 100+ languages supported

AI-powered coding assistant that indexes your entire codebase and helps you write, debug, review, document, and understand code without leaving your editor.

C0 is not a generic chat interface bolted onto an IDE. It is a coding assistant built around a knowledge base that indexes your project. Every workflow C0 offers — debugging, testing, documentation, code review, system mapping — runs against a deep understanding of your actual codebase.

Install from VS Code Marketplace · Quickstart · Documentation

What Makes C0 Different

Most AI coding tools work in isolation. They have no knowledge of your project structure, your team's conventions, or how your modules connect. Every session starts from scratch, and you spend half your time re-explaining the codebase before getting anything useful back.

C0 is built around a knowledge base that continuously indexes your codebase. It understands your functions, your dependencies, your architectural patterns, and how everything connects. As you use C0 more, it becomes more useful because it has more context about your project.

On top of that foundation, C0 provides purpose-built workflows for the things developers actually do every day: tracing bugs to their root cause, generating tests matched to your framework, reviewing code before it merges, producing documentation that reflects how the code actually works, and mapping system structure visually. These are not general-purpose chat prompts. They are structured workflows designed around real development tasks.

Why Developers Choose C0

Workflows

C0 operates through a set of purpose-built workflows, each designed around a specific development task.

Chat with Code

Ask questions about your codebase in plain language. C0 reads the relevant files, traces the flow, and gives you answers grounded in your actual code not generic explanations.

How does authentication work in this project? Where is rate limiting applied and what are the limits? What calls into this function and what does it return?

Debug Mode

Paste an error message or stack trace. C0 locates the source of the problem, explains why it is happening, and suggests a fix in context.

Optimize Mode

Improves performance, readability, and structure across functions or modules. C0 explains each change and why it matters before applying anything.

Generate Test Cases

Produces a test suite for any function or module, matched to your project's existing test framework and conventions. No boilerplate setup required.

Code Review

Reviews staged changes or pull requests for bugs, logic errors, inconsistencies with existing patterns, and potential security issues before code is merged.

Deep Wiki

Generates rich documentation for your codebase including usage notes, parameter descriptions, edge cases, and examples. Stays accurate because it reads the actual implementation, not your memory of it.

Code Map

Visualizes code structure and system flow as Mermaid diagrams. Useful for onboarding, architecture reviews, and understanding unfamiliar modules.

Swagger Agent

Works directly with Swagger documentation and OpenAPI specifications. Understands your API contracts and uses them as context for relevant workflows.

Integrations

Jira

Work directly from tickets without context-switching. C0 reads the ticket description and uses it as context for planning, scaffolding, or reviewing the associated code changes.

Knowledge Base

The indexing layer that powers everything. C0 continuously indexes your codebase and maintains a structured understanding of your project.

Getting Started

Install

Open the Extensions panel in VS Code (Cmd+Shift+X on Mac, Ctrl+Shift+X on Windows/Linux), search for C0, and install. Or click Install at the top of this page.

Sign In

On first launch, C0 will prompt you to sign in. Click Sign in with C0 and complete authentication in your browser. You will be returned to your IDE automatically once signed in.

Index Your Codebase

Open any project folder. C0 detects it and begins indexing automatically. You will see a status indicator in the C0 panel:

• Indexing: C0 is reading your files and building its knowledge base
• Ready: indexing is complete; C0 now understands your codebase

For small projects, initial indexing takes under a minute. For larger codebases, it may take a few minutes on the first run. After that, C0 only re-indexes changed files, so updates are nearly instant. You can start using C0 before indexing finishes results improve as indexing progresses.

Run Your First Workflow

Ask a question about your code

Open the C0 panel, select your knowledge base, and type a question:

@ How does authentication work in this project?

C0 reads the relevant files, traces the flow, and returns a clear explanation grounded in your actual codebase.

Debug an error

Switch to Debug mode, paste an error message or stack trace, and run it:

TypeError: Cannot read properties of undefined (reading 'userId') at AuthMiddleware.verify (src/middleware/auth.js:34)

C0 locates the source of the problem, explains why it is happening, and suggests a fix.

Generate tests for a file

Switch to Generate Test Cases mode, select a file or function, and run it. C0 produces a full test suite matched to your project's existing framework and conventions.

Supported Languages and Frameworks

JavaScript, TypeScript, Python, Go, Java, Kotlin, Rust, C, C++, C#, Swift, PHP, Ruby, Dart, SQL, Shell React, Next.js, Vue, Svelte, Angular, Node.js, FastAPI, Django, Spring, Docker, and more.

Next Steps

• Quickstart install, connect your codebase, and run your first workflow in under five minutes
• How C0 works understand the knowledge base and indexing model

This is readme for C0 if any one has any reviews pls give