nisar-snow-train

nisar-snow-train is a skill for Claude Code, Codex from responsible-genai-hackweek/nicer-nisar. It costs 97 tokens per session (2,042 once invoked), scanned A, original, BSD-3-Clause.

A training workflow for a model that estimates changes in snow depth from matched InSAR and LiDAR measurements, where InSAR uses radar images from space and LiDAR uses laser measurements.

In plain words
What is it for?
Use it to add training pairs, build targets and features, compare model choices, evaluate them with a holdout process, retrain when inputs change, and assign a new model version.
Why use it?
It provides fixed data-matching, evaluation, feature-selection, and model-freezing rules intended to keep training results honest and repeatable.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions CLAUDE.md.

Good fit Use it to add training pairs, build targets and features, compare model choices, evaluate them with a holdout process, retrain when inputs change, and assign a new model version.

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Install with agentmods
npx agentmods add skills/responsible-genai-hackweek/nicer-nisar/nisar-snow-train
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 responsible-genai-hackweek/nicer-nisar --skill nisar-snow-train
Clone the repo
git clone --depth 1 https://github.com/responsible-genai-hackweek/nicer-nisar

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.

agentmods badge for nisar-snow-train

README.md
[![agentmods](https://agentmods.dev/badge/skills/responsible-genai-hackweek/nicer-nisar/nisar-snow-train/github.svg)](https://agentmods.dev/skills/responsible-genai-hackweek/nicer-nisar/nisar-snow-train)
Your own site
<a href="https://agentmods.dev/skills/responsible-genai-hackweek/nicer-nisar/nisar-snow-train"><img src="https://agentmods.dev/badge/skills/responsible-genai-hackweek/nicer-nisar/nisar-snow-train/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.

agentmods 80×15 button for nisar-snow-train

Your own site · 80×15
<a href="https://agentmods.dev/skills/responsible-genai-hackweek/nicer-nisar/nisar-snow-train"><img src="https://agentmods.dev/badge/skills/responsible-genai-hackweek/nicer-nisar/nisar-snow-train.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 97 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,042 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00097 $0.02042
Opus 5 $0.00048 $0.01021
Sonnet 5 $0.00019 $0.00408
Haiku 4.5 $0.00010 $0.00204

Measured 12d ago against content hash bc06ae1c3387, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

nisar-snow-train 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 12d 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.

contributors/ibrahim/skills/nisar-snow-train/SKILL.md · 156 lines

How it starts

The opening of the file, as written. The whole thing — 156 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Training and freezing a model

Workflow A in CLAUDE.md. Offline, iterative, run once, then frozen. Unlike the prediction path this one has real choices in it, and most of them are choices about not fooling yourself.

matched (InSAR pair, LiDAR flight pair)
  → stream GUNW → build_feature_table → attach_target → apply_row_filters
  → cross_validate + robustness_report → pick estimator → freeze → pin model_id

Entry point: python scripts/run_train.py. Target aggregation is separable and slow: python scripts/build_targets.py dsd caches it first.

When to retrain

  • A new matched pair becomes usable, or you extend to more of the six.
  • FEATURIZER_VERSION or ANCILLARY_VERSION bumps. model.load() will refuse the old artifact — that refusal is the design working, not a bug to route around.
  • FEATURE_COLUMNS changes. It is frozen and ordered; changing it mints a new model_id by construction.

Never edit a frozen model's card to make it load. Refit and pin a new id.

Choosing pairs

C.MATCHED_PAIRS holds the six 12-day InSAR pairs that land within a week of a LiDAR flight on both ends. C.DEFAULT_PAIR_INDEX = 5 is the best match (20260207→20260219, track 077, offsets 0 / +3).

Temporal offset is unmodelled error in the target, not bookkeeping. A ±7 day gap means the LiDAR interval and the InSAR interval do not coincide — snow accumulated or settled in between, and that difference lands in dsd_mean as if it were signal the radar should have seen. Either weight matches by abs(off_ref) + abs(off_sec) or restrict to the tight ones, and say which you did in the card.

Three November pairs predate the first flight (20251203) and are unusable. Track 149 has a contiguous run: 20251226 → 20260107 → 20260119 → 20260131 → 20260212.

Holdout — the decision that determines whether the score means anything

Hold out whole pairs, not pixels, and not spatial blocks if you can avoid it. Random pixel splits leak outright; neighbouring 80 m cells are near-duplicates.

Read the full file on GitHub · 156 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.

  1. 12d ago First seen · 156 lines · 97 tokens per session scan A bc06ae1c3387

Subscribe to this mod's changes

nisar-snow-train is a skill published in the GitHub repository responsible-genai-hackweek/nicer-nisar (2 stars, last pushed 14d ago), licensed BSD-3-Clause. It adds 97 tokens to every session and 2,042 once invoked, about $0.0005 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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