The VSCode extension differs from the Code Ready Studio distribution in that the MTA CLI that is called by the extension to perform the analysis is not included in the extension.
Rather the person using that extension has to download and install it themselves then point the VSCode extension to the path of the MTA CLI

I think we can improve the VSCode Guide.
Specifically this section.
https://access.redhat.com/documentation/en-us/migration_toolkit_for_applications/5.2/html/visual_studio_code_extension_guide/analyzing-projects-with-vs-code-extension_vsc-extension-guide#vs-code-extension-run-configuration_vsc-extension-guide

Add immediately after
3. Complete the following configuration fields:
add the following:

• Name - provide the analsysis configuration with a meaningful name (or accept the default)
• mta-cli - provide the path to the mta-cli executable. For example $HOME/mta-cli-5.3.0.Final/bin/mta-cli
  The mta-cli is available for download from https://developers.redhat.com/products/mta/download

Then replace
Input: Click Add and do one of the following:
with
Input: This should be set to the path of the project that you have open within your IDE. Click Add and do one of the following: