Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/Zhonghao1995/agentic-swmm-workflownpx agentmods add skills/zhonghao1995/agentic-swmm-workflow/swmm-builderWrote 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.
[](https://agentmods.dev/skills/zhonghao1995/agentic-swmm-workflow/swmm-builder)<a href="https://agentmods.dev/skills/zhonghao1995/agentic-swmm-workflow/swmm-builder"><img src="https://agentmods.dev/badge/skills/zhonghao1995/agentic-swmm-workflow/swmm-builder/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/zhonghao1995/agentic-swmm-workflow/swmm-builder"><img src="https://agentmods.dev/badge/skills/zhonghao1995/agentic-swmm-workflow/swmm-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Agent Snooping · line 149 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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 | $0.00052 | $0.01850 |
| Opus 5 | $0.00026 | $0.00925 |
| Sonnet 5 | $0.00010 | $0.00370 |
| Haiku 4.5 | $0.00005 | $0.00185 |
Grade A, and why
swmm-builder 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 169 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SWMM Builder (INP assembly layer)
Part of Agentic SWMM — install the project first for the executable toolchain (aiswmm CLI, SWMM solver, MCP servers).
Contract
Build a runnable SWMM .inp using explicit file inputs:
subcatchments.csv(shape/area/outlet/routing basics)- merged params JSON from
swmm-params - network JSON from
swmm-network - rainfall/time-series references from
swmm-climate - optional options config JSON
The builder writes:
- final SWMM INP text (
--out-inp) - manifest JSON (
--out-manifest) with source paths + SHA256 + key metadata - strict validation diagnostics for critical sections (
[OPTIONS],[RAINGAGES],[TIMESERIES],[SUBCATCHMENTS],[SUBAREAS],[INFILTRATION], and current network sections)
Inputs
Subcatchments CSV schema (required)
Required columns:
subcatchment_idoutletarea_hawidth_mslope_pct
Optional columns:
rain_gage(falls back to default gage from climate/config)curb_length_m(default0)snow_pack(default blank)
Params JSON (required)
Expected to match skills/swmm-params/scripts/merge_swmm_params.py output:
sections.subcatchments(id,pct_imperv)sections.subareas(id, runoff/subarea fields)sections.infiltration(id, Green-Ampt fields)- Required fields are now validated strictly with type/range checks (for example
%Impervand routing percentages must be0..100).
Network JSON (required)
Expected to match skills/swmm-network schema (junctions, outfalls, conduits, etc.).
Builder now validates required network fields used to emit [JUNCTIONS], [OUTFALLS], [CONDUITS], [XSECTIONS], [COORDINATES], and [VERTICES].
Climate references (required in MVP)
Provide either:
--timeseries-textdirectly, or--rainfall-jsonproduced byswmm-climate/format_rainfall.py(must includeoutputs.timeseries_text)
For [RAINGAGES], provide either:
--raingage-jsonfromswmm-climate/build_raingage_section.py, or- rely on default deterministic gage generation from rainfall
series_name.
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 9d ago First seen · 169 lines · 52 tokens per session scan A 637f78b8681e
swmm-builder is a skill published in the GitHub repository Zhonghao1995/agentic-swmm-workflow (27 stars, last pushed 3d ago), licensed MIT. It adds 52 tokens to every session and 1,850 once invoked, about $0.0003 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 2026-08-30.
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