Cody by Sourcegraph — AI with Full Codebase Context

What it is

Cody is Sourcegraph's AI code assistant that differentiates itself by understanding your entire codebase, not just the open file. It uses Sourcegraph's code intelligence platform to build a semantic understanding of cross-file dependencies, function call chains, and project structure.

Cody is available as an extension for VS Code, JetBrains, Visual Studio, Neovim, and Emacs. It targets teams working on large codebases where generic AI assistants produce incomplete or incorrect answers because they lack project-wide context.

How it saves time or tokens

Most AI coding assistants only see the current file plus a few open tabs. When you ask about cross-file behavior (how a function is used across the codebase, what calls a specific API), they guess. Cody pulls relevant code from across your entire repository using Sourcegraph's indexing, giving the LLM the right context before it responds.

The token estimate for this workflow is approximately 1,453 tokens. By providing precise context rather than dumping entire files, Cody reduces both token usage and hallucination rates.

How to use

1. Install the Cody extension:

# VS Code
code --install-extension sourcegraph.cody-ai

# Or search 'Cody' in the Extensions panel (Ctrl+Shift+X)

1. Sign in with your Sourcegraph or GitHub account.

1. Open any project. Cody automatically indexes your codebase and is ready for chat, completions, and inline edits.

Example

# In Cody chat within VS Code:

You: How is the `processPayment` function called across the codebase?

Cody: `processPayment` is called in 3 places:
1. `src/api/orders.ts:142` -- after order validation
2. `src/webhooks/stripe.ts:89` -- on payment intent confirmation
3. `tests/integration/payment.test.ts:45` -- test suite

The function accepts a PaymentIntent object and returns
a TransactionResult. The Stripe webhook path handles
retries via idempotency keys.

Cody also supports inline edits:

# Select code, press Ctrl+Shift+E, type instruction:
'Add error handling for the case where payment provider is unreachable'

Related on TokRepo

• AI Tools for Coding -- Compare Cody with other AI coding assistants
• AI Tools for Documentation -- Tools that help AI understand and generate code documentation

Common pitfalls

• Cody's full codebase context feature requires a Sourcegraph instance or Sourcegraph Cloud account. Without it, Cody falls back to local file context only.
• Enterprise self-hosted deployments need Sourcegraph running alongside Cody. The setup is more involved than a simple extension install.
• Free tier has usage limits on chat and completions. Check Sourcegraph's pricing page for current quota details.