pyHMT2D: Skill for Claude Code

Modify Manning's n roughness, inlet flow, or exit water surface elevation for the open project.

Prerequisites

A project must be open. If not, run /hmt-open first.

Steps

1. Show current materials and boundary conditions so the user knows what is available. Run sequentially — do NOT run in parallel (each call opens a HEC-RAS instance):

   hmt-cli get_materials
   

   hmt-cli get_boundary_conditions
   

   Present both as Markdown tables.

2. Ask the user what to change. They may specify:

   • Manning's n values by material name or ID and new value
   • Inlet flow by BC ID and new value (SRH-2D only)
   • Exit WSE by BC ID and new value (SRH-2D only)

3. Apply Manning's n changes (if any). Map material names to IDs from the materials table shown in step 1.

   hmt-cli set_manning_n --args '{"material_ids": [...], "values": [...], "material_names": [...]}'
   

   Report the old and new values for each material.

4. Apply inlet flow changes (if any, SRH-2D only).

   hmt-cli set_inlet_flow --args '{"bc_ids": [...], "values": [...]}'
   

   Note: skip this step for HEC-RAS models.

5. Apply exit WSE changes (if any, SRH-2D only).

   hmt-cli set_exit_wse --args '{"bc_ids": [...], "values": [...]}'
   

6. Save the modified input files.

   hmt-cli save_modified_inputs
   

   Report the file path where changes were written.

7. Confirm all changes with a summary table: Parameter | Old value | New value. Suggest running /hmt-run to execute the simulation with the new parameters.