Sem: New primitive for code understanding – not LSPs, but entities on top of Git

Semantic understanding on top of Git. Diff, blame, impact, log. Functions, not lines. Left: what git shows you. Right: what actually happened. diff --git a/src/auth/login.ts b/src/auth/login.ts @@ -12,6 +12,18 @@ +export function validateToken(token: string) { + const decoded = jwt.verify(token, SECRET); + if (!decoded.exp || decoded.exp < Date.now()) { + throw new TokenExpiredError(); + } + return decoded; +} + @@ -24,8 +36,10 @@ export async function authenticateUser( - const user = await db.findUser(email); - if (!user) return null; + const user = await db.findUser(email); + if (!user) throw new UserNotFoundError(); + await rateLimiter.check(email); @@ -45,12 +59,0 @@ -export function legacyAuth(user, pass) { - return db.query('SELECT * FROM users - WHERE email = ? AND password = ?', - [user, pass]); -} ┌─ src/auth/login.ts ──────────────── │ │ ⊕ function validateToken [added] │ ∆ function authenticateUser [modified] │ ⊖ function legacyAuth [deleted] │ └──────────────────────────────────── 3 entities changed across 1 file AI agents are 2.3x more accurate when given sem output vs raw line diffs. See the benchmark. Everything works in any Git repo. No config. No plugins. sem diff │ ⊕ function validateToken [added] │ ∆ function authenticateUser [modified] │ ⊖ function legacyAuth [deleted] sem blame │ ⊕ render_inline_diff a1a6fbf Rohan 04-03 │ ⊕ format_terminal a1a6fbf Rohan 04-03 sem impact ⊕ function authenticateUser → depends on: db.findUser, rateLimiter ← used by: loginRoute, authMiddleware ! 42 entities transitively affected sem log │ ae576ab Rohan 02-05 added │ a105183 Rohan 02-08 modified (logic) │ a1a6fbf Rohan 04-03 modified (logic) sem entities entities: src/auth/login.ts function validateToken (L12:24) function authenticateUser (L26:45) interface AuthConfig (L47:52) sem context context for authenticateUser (budget: 8000) target: ~705 tokens dependencies: ~256 tokens dependents: ~812 tokens All commands support --json for machine-readable output. Full reference. 26 languages. 5 data formats. One binary. $ brew install sem-cli $ sem setup ✓ Created wrapper script ✓ Set git config --global diff.external = sem ✓ Pre-commit hook installed Done! Running git diff in any repo will now use sem. To revert, run: sem unsetup One command. Every git diff becomes a sem diff . No config files. Also: cargo install --git https://github.com/Ataraxy-Labs/sem sem-cli