mcp sdk 0.5.0 tool param validation - does it check types at runtime or trust the schema

hit a prod issue yesterday where we passed a string to a tool expecting int, sdk accepted it and tool crashed. wondering if 0.5.0 does any runtime type checking or if it just trusts that params match the schema. 1. if there's no validation we need to wrap every tool with type guards 2. curious if anyone has tested passing completely wrong types (array instead of object, etc) and what happens