The Agent Skills Directory

[EXTERNAL_DOWNLOADS]: The skill provides instructions to download the Echidna binary from the official Trail of Bits GitHub repository (github.com/crytic/echidna). This is a well-known security research organization and the source is appropriate for the skill's purpose.
[COMMAND_EXECUTION]: Documentation includes standard setup commands for moving binaries to the system path using sudo and installing compiler management tools like solc-select. These are necessary administrative tasks for configuring the development environment described.
[REMOTE_CODE_EXECUTION]: Installation steps involve downloading and extracting prebuilt binaries (curl | tar). While this executes remote code upon extraction, it is the standard and documented method for installing the Echidna tool from its official source.

echidna