Generate Code in Gemini Using Its Whole-Repo Context

Generating code with Gemini by taking advantage of its large context window — feeding in the relevant repository or files as a whole, then asking for a change that's consistent with all of it.

Gemini can hold a lot of context at once, so it can reason across many files instead of one snippet. Given the whole picture, it generates code that matches the existing patterns and doesn't contradict code it can't see — the main failure of snippet-only prompting.

Changes that depend on conventions and types spread across a codebase, where the right code is defined by everything around it, not just the target file.

A small self-contained utility with no repository dependencies — there the extra context is just cost.

Here are the relevant files for context:

<paste the files / repo section>

Now implement <change>. Match the existing patterns, types, and error handling you can see above. Point out anything in the provided code that your change assumes or depends on.

Given a service, its types, and two similar features, Gemini adds a third that reuses the shared validation and matching error types — because it could see all three at once.

Ask Gemini to first summarise the conventions it detects across the files, then generate to them. Making the implicit rules explicit catches a wrong assumption before it's baked into the code.

• Pasting one file when the correct code depends on types defined in another.
• Overloading the window with truly irrelevant files and diluting the signal.
• Assuming 'big context' means Gemini will infer intent you never stated — it still needs the ask.