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.
npx skills add gauss314/skills --skill yahoo-financegit clone --depth 1 https://github.com/gauss314/skillsWrote 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/gauss314/skills/yahoo-finance)<a href="https://agentmods.dev/skills/gauss314/skills/yahoo-finance"><img src="https://agentmods.dev/badge/skills/gauss314/skills/yahoo-finance/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/gauss314/skills/yahoo-finance"><img src="https://agentmods.dev/badge/skills/gauss314/skills/yahoo-finance.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00027 | $0.03006 |
| Opus 5 | $0.00014 | $0.01503 |
| Sonnet 5 | $0.00005 | $0.00601 |
| Haiku 4.5 | $0.00003 | $0.00301 |
Grade A, and why
yahoo-finance 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 11d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
r = requests.get("https://query1.finance.yahoo.com/v8/finance/chart/AAPL", How it starts
The opening of the file, as written. The whole thing — 279 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Yahoo Finance — API Directa (sin yfinance)
API no oficial de Yahoo Finance. Accedé a datos de acciones, ETFs, crypto, forex, bonos, índices, opciones, fundamentos y noticias mediante requests HTTP directos sin usar yfinance ni ningún wrapper.
Base URL: https://query1.finance.yahoo.com
Alternativa: https://query2.finance.yahoo.com
⚠️ Importante
- Yahoo no tiene API pública oficial desde 2017. Estos endpoints son no oficiales y pueden cambiar sin aviso.
- Algunos endpoints requieren autenticación via cookie + crumb (abajo se explica).
- El endpoint
v8/finance/chartfunciona sin autenticación (solo User-Agent de navegador). - Siempre implementar rate limiting y manejo de errores.
Documentación completa
Para referencia exhaustiva de todos los endpoints, campos, JSON structures, códigos de error, tickers internacionales, estrategias de rate limiting y ejemplos detallados, ver:
Ese documento incluye:
- Los 33 módulos de
quoteSummarycon cada campo documentado - JSON responses completas de cada endpoint
- Tickers internacionales (
.BApara Argentina,.SApara Brasil, etc.) - WebSocket streaming
- Screener, lookup, trending
- Estrategias de rate limiting con exponential backoff y rotación de User-Agent
Autenticación: Cookie + Crumb
Varios endpoints requieren un crumb (token CSRF) que se obtiene con cookies de sesión.
import requests
BASE = "https://query1.finance.yahoo.com"
HEADERS = {
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36"
}
def yahoo_session():
"""Retorna requests.Session con cookie A3 y crumb."""
s = requests.Session()
s.headers.update(HEADERS)
s.get("https://fc.yahoo.com", timeout=10)
crumb = s.get(f"{BASE}/v1/test/getcrumb", timeout=10).text.strip()
s.params = {"crumb": crumb}
return s
# Uso:
# s = yahoo_session()
# r = s.get("https://query1.finance.yahoo.com/v7/finance/quote?symbols=AAPL,MSFT")
What ships with it
5 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.
- 11d ago First seen · 279 lines · 27 tokens per session scan A 892d73bff266
yahoo-finance is a skill published in the GitHub repository gauss314/skills (237 stars, last pushed 2mo ago), licensed MIT. It adds 27 tokens to every session and 3,006 once invoked, about $0.0001 per session on Opus 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 2026-08-30.
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