diff --git a/.gitignore b/.gitignore
index 6e8cba0..d4038ef 100644
--- a/.gitignore
+++ b/.gitignore
@@ -159,4 +159,5 @@ packages/infra/prisma/generated/
 .devbox
 docker-compose.override.yml
 
-.turbo/
\ No newline at end of file
+.turbo/
+typecheck_errors.txt
diff --git a/AGENTS.md b/AGENTS.md
index 9fb8b84..8e7635e 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -116,6 +116,7 @@ These are placeholders to align teams; adjust once packages exist.
 - Legacy concepts may use Korean identifiers; preserve Korean naming when it improves maintainability.
 - Hybrid naming is acceptable (e.g., `use전투규칙`, `use도시상태`) when the prefix is conventional but the domain term is Korean.
 - For classes, commands, and domain logic, add clear Korean comments to support Korean readers and future maintainers.
+- Use strong type conventions in TypeScript. Any is not allowed, and you should also be careful about using unknown.
 
 ## Commit & Pull Request Guidelines