Function validate_input_path 

pub fn validate_input_path(path: &str, kind: &str) -> Result<PathBuf, McpError>

Validate a user-supplied file path that must already exist.

Must be absolute, must exist, must canonicalize cleanly with no .. components in the result. Returns the canonical path on success.

kind is a short label used in error messages (e.g. "data file", "export", "chart output"). For attach paths use validate_local_path which uses "attach path" as the label.

Errors

• Returns ErrorCode::InvalidArgument if path is relative or if the canonicalized path contains .. components.
• Returns ErrorCode::FileNotFound if std::fs::canonicalize fails.