A tool for inspecting and editing HEC-RAS flood-modelling projects without opening the HEC-RAS graphical program. HEC-RAS is engineering software used to model rivers, flooding, and water flow.

Use it to inspect plans, geometries, flow files, and boundary conditions; copy projects; change simulation settings; and replace or scale hydrograph values.

It makes project changes and reviews repeatable from files or scripts, while supporting safe copies before edits.

ras-model — Skill for Claude Code and Codex by Zhonghao1995

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add Zhonghao1995/Agentic-HEC-RAS --skill ras-model

Clone the repo

git clone --depth 1 https://github.com/Zhonghao1995/Agentic-HEC-RAS

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/zhonghao1995/agentic-hec-ras/ras-model.svg)](https://agentmods.dev/skills/zhonghao1995/agentic-hec-ras/ras-model)

Your own site

<a href="https://agentmods.dev/skills/zhonghao1995/agentic-hec-ras/ras-model"><img src="https://agentmods.dev/badge/skills/zhonghao1995/agentic-hec-ras/ras-model.svg" alt="Measured on agentmods" height="20"></a>

Per session 142 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 949 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00142	$0.00949
Opus 5	$0.00071	$0.00475
Sonnet 5	$0.00028	$0.00190
Haiku 4.5	$0.00014	$0.00095

Measured 7d ago against content hash c2d14059d9bb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

ras-model scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/ras-model/SKILL.md · 39 lines

How it starts

The opening of the file, as written. The whole thing — 39 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ras-model: inspect + edit (no GUI, no HEC-RAS needed)

Tools

Tool	Does	Needs
`ras_project_info`	project overview: plans (title, short id, g##, u##/f##, sim window, intervals, cores, results HDF present?), geometries, flow files + boundaries, current plan, detected `Ras.exe`; `plan` -> that plan's boundaries in detail (`boundary_index`, river/reach/rs or area/bc_line, kind, interval, n, peak; `include_values` for the series)	`.prj`
`ras_project_copy`	copy the whole project folder to `dest` (results/logs excluded unless `include_results`)	folder
`ras_plan_set`	edit one `.p##`: `simulation_start` / `simulation_end`, `computation_interval`, `output_interval`, `mapping_interval`, `num_cores`, `short_id`, `title`, `description`, `geom`, `flow`	a copy
`ras_flow_set_hydrograph`	edit ONE boundary table in a `.u##`: `values` (replace, any length), `multiplier` (scale existing values), `qmult` (HEC-RAS QMult multiplier, values untouched), `interval`; select by `boundary_index` or `river`/`reach`/`rs` or `area`/`bc_line`	a copy

Procedure

ras_project_info(project) -> pick the plan; note flow_kind (only unsteady plans have an editable .u##).
ras_project_copy(project, dest=runs/<case>/00_<name>) for EVERY variant (baseline too).
ras_project_info(project=<copy>, plan=..) -> read plan_detail.boundaries; use its index.
Edit the copy:
- inflow +20 %: ras_flow_set_hydrograph(project=<copy>, plan="03", boundary_index=0, multiplier=1.2)
- new event: ras_flow_set_hydrograph(..., values=[...], interval="15MIN") (values in the project's units)
- shorter time step / window / cores: ras_plan_set(project=<copy>, plan="03", computation_interval="5SEC", num_cores=4)
Re-run ras_project_info(plan=..) and quote the before/after from the tool return in the report.

Rules

Never edit the original folder; every edit tool rewrites files in place.
One boundary per ras_flow_set_hydrograph call; the tool refuses ambiguous selectors — add river/reach/rs.
multiplier and values are mutually exclusive; qmult leaves the table alone (HEC-RAS scales at run time) — prefer multiplier when the edited file must show the actual numbers.
Precipitation: only a Precipitation Hydrograph TABLE in the .u## is editable; gridded (DSS) precipitation is not.
Steady-flow files (.f##), geometry (.g##), terrain, land cover, 2D mesh, structures: not editable here (GUI / RAS Mapper).
Intervals must be HEC-RAS strings (1SEC ... 1DAY); dates 02JAN1900 0000 or ISO 1900-01-02T00:00.
Units follow the project (US customary: cfs / ft; SI: m3/s / m) — check ras_results_summary.units_system on any HDF or the plan HDF root.

Read the full file on GitHub · 39 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

7d ago First seen · 39 lines · 142 tokens per session scan A c2d14059d9bb

Subscribe to this mod's changes

ras-model is a skill published in the GitHub repository Zhonghao1995/Agentic-HEC-RAS (1 stars, last pushed 21d ago), licensed MIT. It adds 142 tokens to every session and 949 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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