diff --git a/AGENTS.md b/AGENTS.md
index 86a40aa..d9416f8 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -29,11 +29,13 @@ Key product constraints:
 ## Build and test
 
 Use `make help` as the source of truth for available build/test targets and descriptions.
+To verify your changes you must run tests and do a build.
 
 ## Coding conventions
 
 - Keep changes minimal and focused.
 - Backward compatibility is not a concern unless explicitly requested.
+- Do not add compatibility shims, fallback paths, legacy aliases, or dual behavior unless explicitly requested.
 - Preserve unauthenticated behavior unless explicitly requested.
 - Keep limits/operator controls configurable via config.
 - Maintain write-route protections (allowlist and rate limiting).