Workflows won't run properly on Monterey, opens terminal instead of calling executable with parameter

The operating system includes /usr/local/bin in its default search paths, but not /usr/local. If /usr/local/bin existed before the Monterey upgrade, then it should have been retained afterward with its contents.

However, you should not just dump your executables into /usr/local. Instead, you should create the bin child sub-directory from the Terminal command line, where you replace the word shortname with your own short user name:

sudo mkdir -p /usr/local/bin
sudo chown shortname:admin /usr/local/bin
sudo chmod 755 /usr/local/bin

Then, move the executables that you placed in /usr/local back into /usr/local/bin.

You may want your PATH environment variable set to look in /usr/local/bin first if there are command names in there that may conflict with identical names elsewhere in the operating system installation. Same scenario whether ~/.zshrc or ~/.bash_profile:

export PATH="/usr/local/bin:$PATH

In practice, my PATH statement is more complicated on Big Sur and Monterey due to other things that I have installed.

Depending on your individual scripts, you may need to introduce the following in the script before referencing applications, or you can use explicit paths for the applications that you reference. Pick the one for your SHELL:

source ~/.zshrc
source ~/.bash_profile

You are missing the 'multimarkdown' binary which needs to be located in '/usr/local/bin/multimarkdown'. The MarkdownServiceTools requires this binary and it is not distributed with the services collection from Brett Terpstra.

The MultiMarkDown binary is open source and the original code is found here:

https://github.com/fletcher/MultiMarkdown

https://fletcherpenney.net/multimarkdown/

You can install MultiMarkDown using the Homebrew package manager found here:

https://brew.sh - follow the instructions and read about Homebrew.

Install Homebrew then use the following command to install MultiMarkDown:

brew install multimarkdown

Homebrew is extremely useful to install open source software onto macOS. You may find many other tools available with Homebrew.

On Intel Mac's you merely need to install Homebrew then multimarkdown and then the MarkDownServiceTools and all will work as designed.

On Apple Silicon M1 based Macs Homebrew will put the files in /opt/homebrew/bin. You can create the '/usr/local/bin' directory on an M1 Mac and then create a symbolic link to the multimarkdown binary.

sudo mkdir -p /usr/local/bin
sudo ln -s /opt/homebrew/bin/multimarkdown /usr/local/bin

Creating the symbolic link will satisfy the MarkDownServiceTools workflows which are hardcoded to look for multimarkdown in /usr/local/bin. The symbolic link will redirect to the actual binary in /opt/homebrew/bin which ironically is another symbolic link as Homebrew manages multiple versions of packages and creates symbolic links for them.

Or you can do as I did, and add /opt/homebrew/bin to the PATH statement since my two principal Macs are M1 devices.