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weather-api

weather-api is a skill for Claude Code from vaisala-xweather/xweather-agent-skills. It costs 159 tokens per session (6,428 once invoked), scanned A, original, MIT.

A request builder for the Xweather Weather API, an online service that provides weather data.

In plain words
What is it for?
Use it to request observations, conditions, forecasts, alerts, lightning, air quality, tropical cyclones, tides, road weather, and other supported weather data.
Why use it?
It turns plain-language requests into correctly structured API URLs, reducing mistakes in endpoints, locations, filters, dates, and credentials.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the xweather plugin — 6 skills shipped together

not rated 6repo changed 16d ago A scan 159 tokens original MIT

Good fit Use it to request observations, conditions, forecasts, alerts, lightning, air quality, tropical cyclones, tides, road weather, and other supported weather data.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/vaisala-xweather/xweather-agent-skills/weather-api
View source ↗ vaisala-xweather/xweather-agent-skills
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 vaisala-xweather/xweather-agent-skills --skill weather-api
Clone the repo
git clone --depth 1 https://github.com/vaisala-xweather/xweather-agent-skills

Made for: Claude Code.

Or install xweather, the plugin that ships this one along with the rest of its 6 skills.

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 weather-api

README.md
[![agentmods](https://agentmods.dev/badge/skills/vaisala-xweather/xweather-agent-skills/weather-api/github.svg)](https://agentmods.dev/skills/vaisala-xweather/xweather-agent-skills/weather-api)
Your own site
<a href="https://agentmods.dev/skills/vaisala-xweather/xweather-agent-skills/weather-api"><img src="https://agentmods.dev/badge/skills/vaisala-xweather/xweather-agent-skills/weather-api/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 weather-api

Your own site · 80×15
<a href="https://agentmods.dev/skills/vaisala-xweather/xweather-agent-skills/weather-api"><img src="https://agentmods.dev/badge/skills/vaisala-xweather/xweather-agent-skills/weather-api.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 159 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 6,428 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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 $0.00159 $0.06428
Opus 5.5 $0.00064 $0.02571
Sonnet 5.5 $0.00032 $0.01286
Haiku 4.5 $0.00016 $0.00643

Measured 16d ago against content hash 3dfb2a206d77, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

weather-api scanned grade A with 1 finding 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 16d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/xwrequest.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s https://www.xweather.com/docs/api/weather-api/endpoints
plugins/xweather/skills/weather-api/SKILL.md · 402 lines

How it starts

The opening of the file, as written. The whole thing — 402 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Xweather Weather API URL builder

Turn a description of wanted weather data into a correct data.api.xweather.com URL — and, when credentials are available, execute it and return the data alongside the URL.

Request anatomy

https://data.api.xweather.com/{endpoint}/{action}/{:id}?{params}&client_id=…&client_secret=…
Segment Example Notes
endpoint observations, conditions/summary What data. 59 of them — see references/endpoints.md.
action closest, within, search, route, contains, affects How to look it up. Omitted entirely for :id and :all.
:id seattle,wa, 98109, 44.97,-93.26, KMSP The place or record identifier. Goes in p= instead when an action occupies the path slot.
params filter=, query=, fields=, limit=, from=/to=, format= Shape the result.
credentials client_id + client_secret Query params on every request; no header form exists.

api.aerisapi.com is the legacy host and still works — always emit data.api.xweather.com.

Workflow

  1. Extract from the prompt: what data, which place(s), what time, and what shape of answer (one record, N nearest, everything in an area, along a route, is-this-point-inside-a-polygon).
  2. Pick the endpoint. Use the intent map below; confirm against references/endpoints.md.
  3. Pick the action from the decision table below. Verify the endpoint actually supports it — endpoints.md lists supported actions per endpoint, and an unsupported one returns not_implemented.
  4. Add parameters. filter and query tokens are endpoint-specific; only use tokens listed for that endpoint in endpoints.md. Read references/filters.md when choosing between similar tokens (standard vs all for alerts, day vs daynight vs mdnt2mdnt for forecasts) — grep for the ## /endpoint heading rather than reading the whole file.
  5. Sanity-check against a documented example. references/examples.md has the API's own example requests for every endpoint; references/recipes.md has 34 real-world queries by use case. If the request resembles one, copy its structure instead of inventing parameters.
  6. Emit the URL with its access cost (see Access cost — always report it), then decide whether to run it (see Executing the request).

Read the full file on GitHub · 402 lines

Files

What ships with it

7 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.

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. 16d ago Changed 3dfb2a206d77
  2. 18d ago Changed f57cbd0e0a3d
  3. 29d ago Changed · +7 lines e5d33a0ae359
  4. 1mo ago Changed 5658893c5fb8
  5. 1mo ago Changed 6f2c68bed3b5
  6. 2mo ago Changed f68c77a80c21
  7. 2mo ago First seen · 395 lines · 159 tokens per session scan A 4276ffe531bf

Subscribe to this mod's changes

weather-api is a skill published in the GitHub repository vaisala-xweather/xweather-agent-skills (6 stars, last pushed 16d ago), licensed MIT. It adds 159 tokens to every session and 6,428 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Backend and APIs
Related

weather-api compared with skills from other repositories

weather-api next to 6 skills from other repositories
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dev-runtimelangwatch/langwatchSkill5.0ktodayApache-2.0A172Claude Code
api-designericrisco/rsc-harnessSkill579yesterdayMITA105Claude Code, Codex
migrate-segw-to-raparc-mcp/arc-1Skill2572d agoMITA106Claude Code