peak-window-mcp-app: Instructions file for Claude Code

CLAUDE.md

peak-window-mcp-app CLAUDE.md is an instructions file for Claude Code from ByteOverDev/peak-window-mcp-app. It costs 4,256 tokens per session, scanned A, original, MIT.

Project instructions for PeakWindow, a weather service that chooses forecast sources and scores possible time windows. They describe provider selection, hourly scoring, and window-level scoring.

In plain words
What is it for?
Use them when working on forecast providers, location coverage, hourly scores, time-window scores, or the scoring code in src/scoring.ts.
Why use it?
They give coding agents the project-specific rules needed to understand how forecasts are selected and evaluated. This helps keep changes consistent with the existing design.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is ByteOverDev/peak-window-mcp-app's own configuration. It tells Claude Code how to work on peak-window-mcp-app itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything peak-window-mcp-app configures →

Reuse

Borrowing it

Nothing to install: this file belongs to ByteOverDev/peak-window-mcp-app. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/ByteOverDev/peak-window-mcp-app/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/ByteOverDev/peak-window-mcp-app

Made for: Claude Code.

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When invoked 4,256 The same file — it is already loaded in full.
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 $0.04256 $0.04256
Opus 5.5 $0.01702 $0.01702
Sonnet 5.5 $0.00851 $0.00851
Haiku 4.5 $0.00426 $0.00426

Measured 2mo ago against content hash 671271ffb1bf, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

peak-window-mcp-app CLAUDE.md 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 2mo 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.

CLAUDE.md · 259 lines

How it starts

The opening of the file, as written. The whole thing — 259 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Weather MCP Project

Forecast Provider Architecture

PeakWindow uses a multi-provider abstraction (src/providers/) to select the best forecast source for each location. Providers are tried in priority order; on API failure, the router falls through to the next.

Priority Provider Resolution Coverage Source
1 GeoSphere Austria 2.5 km Austria & Eastern Alps (9.5–22.1°E, 43–51.8°N) Direct API (dataset.api.hub.geosphere.at)
2 MeteoSwiss ICON-CH2 2 km Alpine region (0.5–16.5°E, 43–49.9°N) Open-Meteo (models=meteoswiss_icon_ch2)
3 Météo-France AROME 2.5 km France & surrounds (-9–14°E, 38–55°N) Open-Meteo (models=meteofrance_arome_france)
4 Open-Meteo default ~11 km Global Open-Meteo (best available model blend)

GeoSphere routing note: the AROME model's true domain reaches west to 5.5°E (BBOX in geosphere.ts), but its skill is Austria-centric and degrades toward the western edge. So covers() only makes it the first choice east of 9.5°E (PREFERRED_WEST, ~the Austria–Switzerland border). West of that — the Swiss/French/Italian Alps, e.g. Matterhorn (7.66°E), Mont Blanc (6.87°E) — the router falls through to the region-tuned MeteoSwiss ICON-CH2 / Météo-France AROME, which match Mountain-Forecast notably better on summit temperature and snow line.

Key files:

  • src/providers/types.ts — ForecastProvider interface, ForecastProviderResult
  • src/providers/geosphere.ts — direct GeoSphere API (deaccumulates precip, derives model terrain from sp)
  • src/providers/openmeteo.ts — factory for Open-Meteo-based providers (MeteoSwiss, Météo-France, default)
  • src/providers/index.ts — router with ordered fallback

Elevation correction (pressure-level profile + lapse fallback)

Summit temperature is corrected from the forecast grid-cell elevation to the real summit elevation in analyzeForecast (src/analyze.ts), via two strategies decided per hour in interpolateAtElevation (src/profile-interp.ts):

Read the full file on GitHub · 259 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. 2mo ago First seen · 259 lines · 4,256 tokens per session scan A 671271ffb1bf

Subscribe to this mod's changes

peak-window-mcp-app CLAUDE.md is an instructions file published in the GitHub repository ByteOverDev/peak-window-mcp-app (3 stars, last pushed 5mo ago), licensed MIT. It adds 4,256 tokens to every session, about $0.0170 per session on Opus 5.5. 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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