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Agent skill

Hmt Modify

by psu-efd in psu-efd/pyHMT2D

Modify Manning's n roughness coefficients, inlet flow rates, or exit water surface elevations for the currently open pyHMT2D project and save the changes.

MITAuto-check passed

Install Hmt Modify

skills CLI
$ npx skills add psu-efd/pyHMT2D --skill hmt-modify -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install psu-efd/pyHMT2D hmt-modify --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/psu-efd/pyHMT2D.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/hmt-modify .claude/skills/hmt-modify && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
hmt-modify
GitHub stars
133
Token cost
~470 tokens
SKILL.md length
192 words
Files
1
Skills in repo
9
Repo updated
First seen
Licence
MIT

At a glance

Modify Manning's n roughness coefficients, inlet flow rates, or exit water surface elevations for the currently open pyHMT2D project and save the changes.

  • Works in 7 steps: Show current materials and boundary… → Ask the user what to change. They may… → Apply Manning's n changes (if any). → …
  • Wants to change model parameters
  • SKILL.md covers Prerequisites and Steps
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Hmt Modify is an agent skill from psu-efd/pyHMT2D. Modify Manning's n roughness coefficients, inlet flow rates, or exit water surface elevations for the currently open pyHMT2D project and save the changes. Use this when the user wants to change model parameters.

Its SKILL.md is about 470 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: Python Hydraulic Modeling Tools - 2D. The licence is MIT.

When your agent uses it

  • Wants to change model parameters

Example prompts

  • “/hmt-modify”

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

  1. Show current materials and boundary conditions so the user knows what is available.
  2. Ask the user what to change. They may specify
  3. Apply Manning's n changes (if any).
  4. Apply inlet flow changes (if any, SRH-2D only).
  5. Apply exit WSE changes (if any, SRH-2D only).
  6. Save the modified input files.
  7. Confirm all changes with a summary table: Parameter | Old value | New value.

What it can do on your machine

Read from SKILL.md and the folder at commit 57645ff. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Hmt Modify loads about 470 tokens when it runs. Until then it costs about 56 tokens; SKILL.md has 192 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~56
When it runs · the whole SKILL.md, loaded when a task matches
~470

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from psu-efd/pyHMT2D at commit 57645ff, republished under its MIT licence (© psu-efd). 192 words, ~470 tokens.

Download SKILL.mdSave it as .claude/skills/hmt-modify/SKILL.md (or your agent's skills folder).
name
hmt-modify
description
Modify Manning's n roughness coefficients, inlet flow rates, or exit water surface elevations for the currently open pyHMT2D project and save the changes. Use this when the user wants to change model parameters.

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):

    bash
    hmt-cli get_materials
    bash
    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.

    bash
    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).

    bash
    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).

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

  6. Save the modified input files.

    bash
    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.

© psu-efd, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .agents/skills/hmt-modify of psu-efd/pyHMT2D.

Open the folder on GitHubat commit 57645ff

Compare with similar skills

Hmt Modify next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Hmt Modify compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Hmt Modify this skillpsu-efd/pyHMT2D133—~470Automated safety check: PassMIT
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Brave Mansickn33/agentic-awesome-skills47k1 repos~2.8kAutomated safety check: PassMIT
Gameobject ModifyIvanMurzak/Unity-MCP4.4k—~2.3kAutomated safety check: PassApache-2.0
Object ModifyIvanMurzak/Unity-MCP4.4k—~2.3kAutomated safety check: PassApache-2.0
Assets ModifyIvanMurzak/Unity-MCP4.4k—~1.7kAutomated safety check: PassApache-2.0

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Questions about Hmt Modify

What does Hmt Modify do?

Modify Manning's n roughness coefficients, inlet flow rates, or exit water surface elevations for the currently open pyHMT2D project and save the changes. Hmt Modify is an agent skill from psu-efd/pyHMT2D. Modify Manning's n roughness coefficients, inlet flow rates, or exit water surface elevations for the currently open pyHMT2D project and save the changes.

When should I use Hmt Modify?

Hmt Modify fits situations like: wants to change model parameters.

How do I install Hmt Modify in Claude Code?

Run `npx skills add psu-efd/pyHMT2D --skill hmt-modify -a claude-code`. Or copy the skill folder (.agents/skills/hmt-modify in psu-efd/pyHMT2D) into .claude/skills/hmt-modify in your project. Claude Code loads it when a task matches its description.

How do I install Hmt Modify in Codex?

Run `npx skills add psu-efd/pyHMT2D --skill hmt-modify -a codex`. Or copy the skill folder (.agents/skills/hmt-modify in psu-efd/pyHMT2D) into .agents/skills/hmt-modify in your project. Codex loads it when a task matches its description.

Can I use Hmt Modify in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add psu-efd/pyHMT2D --skill hmt-modify -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/hmt-modify, .gemini/skills/hmt-modify, .github/skills/hmt-modify and .opencode/skills/hmt-modify in your project.

What does Hmt Modify need to run?

SKILL.md names no scripts, command-line tools or credentials: Hmt Modify is instructions for the agent only.

Does Hmt Modify access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Hmt Modify safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Hmt Modify use?

Hmt Modify is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Hmt Modify use?

About 470 tokens (SKILL.md is roughly 1.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Hmt Modify?

Skills that share tags, products or a category with Hmt Modify: Conducting Man In The Middle Attack Simulation (mukul975/Anthropic-Cybersecurity-Skills, 34k stars), Brave Man (sickn33/agentic-awesome-skills, 47k stars), Gameobject Modify (IvanMurzak/Unity-MCP, 4.4k stars) and Object Modify (IvanMurzak/Unity-MCP, 4.4k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Hmt Modify?

psu-efd (a GitHub user) maintains it in psu-efd/pyHMT2D, which has 133 GitHub stars. The repository holds 9 skills in this directory. The repository was last updated on August 9, 2026.

Source: psu-efd/pyHMT2D on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.