compute_something.xml

<tool id="fa_gc_content_1" name="Compute GC content with python tool">
  <description>for each sequence in a file</description>
  <command interpreter="python">compute_something.py $input $output</command>
  <inputs>
    <param format="fasta" name="input" type="data" label="Source file"/>
  </inputs>
  <outputs>
    <data format="tabular" name="output" />
  </outputs>

  <tests>
    <test>
      <param name="input" value="fa_gc_content_input.fa"/>
      <output name="out_file1" file="fa_gc_content_output.txt"/>
    </test>
  </tests>

  <help>
This tool computes GC content from a FASTA file from python script
  </help>

</tool>