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Explain an unfamiliar codebase

Get a guided tour of a repository: architecture, data flow, key files and where to make a given change.

GeminiCodingRuleStack original

Written for Gemini 4 Argon · Updated 2026-10-16

Note: Review and test before use. Provided as is, without warranty. See Terms.

Here is a repository dump [or attached files]. Explain it for a developer joining the team: 1) what it does, 2) architecture diagram in Mermaid, 3) request/data flow for [main feature], 4) the 10 most important files and what each does, 5) how to run and test it, 6) where I'd change code to [planned change]. Cite file paths.

Replace everything in [square brackets] with your own details.

Settings & parameters

• gemini-4-argon, thinking high; long context handles large codebases

Variations

• Focus on security-sensitive paths only.
• Generate an onboarding doc in Markdown.

Tips

• Exclude build artifacts and lockfiles to save context.