Show HN: DocSync – Git hooks that block commits with stale documentation
suhteevah Sunday, February 15, 2026
Hi HN,
I built DocSync because every team I've worked on has the same problem: documentation that was accurate when it was written and never updated after.
DocSync uses tree-sitter to parse your code and extract symbols (functions, classes, types). On every commit, a pre-commit hook compares those symbols against existing docs. If you added a function without documenting it, the commit is blocked.
How it works:
1. `clawhub install docsync` (free) 2. `docsync generate .` — generates docs from your code 3. `docsync hooks install` — installs a lefthook pre-commit hook 4. From now on, every commit checks for doc drift
Key design decisions: - 100% local — no code leaves your machine. Uses tree-sitter for AST parsing, not an LLM. - Falls back to regex if tree-sitter isn't installed - Uses lefthook (not husky) for git hooks — it's faster and language-agnostic - License validation is offline (signed JWT, no phone-home) - Free tier does one-shot doc generation. Pro ($29/user/mo) adds hooks and drift detection.
Supports TypeScript, JavaScript, Python, Rust, Go, Java, C/C++, Ruby, PHP, C#, Swift, Kotlin.
Landing page: https://docsync-1q4.pages.dev
Would love feedback on the approach. Is doc drift detection something your team would actually use?