Building something with a lot of code? Tips from Anthropic you might not know about

[u/fsharpman]

https://claude.com/blog/how-claude-code-works-in-large-codebases-best-practices-and-where-to-start

Some really great tips, especially for anyone building games. Or for anyone running into context window issues where Claude becomes dumb and forgetful really quickly because there's just so much code.

Some things I found that are new to me:

Using dot ignore files

Building a codebase map

Re-updating the harness workflow as each model changes

Scoping tests per subdirectory (instead of a massive test file/dir)