Developed an enhancement for the michaelficarra/wasm-tools repository, focusing on the embed command within the CLI to introduce a --only-custom flag. This addition allows users to emit solely the Custom section of a WebAssembly component, providing more granular control over output content. The work involved implementing the feature in Rust, leveraging CLI development skills and a strong understanding of WebAssembly internals. A new test case was created to validate the behavior of the flag, ensuring reliability and improved test coverage. The approach demonstrated a test-driven workflow and careful alignment of code changes with the project’s release process.