A guide for working with yfinance, a Python tool that retrieves Yahoo Finance market data.

Use it when fetching price history, financial statements, analyst data, stock and fund screens, live quotes, or sector, industry, and fund summaries.

It helps keep common finance-data tasks consistent when working with prices, company reports, analyst information, or investment categories.

How SilvioBaratto/optimizer configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to SilvioBaratto/optimizer. 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/SilvioBaratto/optimizer/development/.claude/skills/yfinance/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/SilvioBaratto/optimizer

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/silviobaratto/optimizer/yfinance/github.svg)](https://agentmods.dev/skills/silviobaratto/optimizer/yfinance)

Your own site

<a href="https://agentmods.dev/skills/silviobaratto/optimizer/yfinance"><img src="https://agentmods.dev/badge/skills/silviobaratto/optimizer/yfinance/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/silviobaratto/optimizer/yfinance"><img src="https://agentmods.dev/badge/skills/silviobaratto/optimizer/yfinance.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 213 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,247 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 unknown 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.

Model	Per session	Once invoked
Fable 5.1	$0.00213	$0.04247
Opus 5.5	$0.00085	$0.01699
Sonnet 5.5	$0.00043	$0.00849
Haiku 4.5	$0.00021	$0.00425

Measured 1mo ago against content hash f66a36afeec2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

yfinance 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 1mo 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/skills/yfinance/SKILL.md · 201 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

10 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.

1mo ago Changed · +22 lines · +43 tokens per session f66a36afeec2
2mo ago First seen · 179 lines · 170 tokens per session scan A 2fdb1d77c200

Subscribe to this mod's changes

yfinance is a skill published in the GitHub repository SilvioBaratto/optimizer (177 stars, last pushed 2d ago), with no licence file. It adds 213 tokens to every session and 4,247 once invoked, about $0.0009 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 2026-08-30.

Finance and fintech Languages Python ai quantfinance skfolio

yfinance next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
yfinanceSilvioBaratto/optimizer	Skill	177	2d ago	none	A	213	Claude Code
vnpy-exportHKUDS/Vibe-Trading	Skill	38k	yesterday	MIT	A	40	Claude Code, Codex
yfinanceHKUDS/Vibe-Trading	Skill	38k	yesterday	MIT	A	41	Claude Code, Codex
tqsdk-trading-and-datashinnytech/tqsdk-python	Skill	5.1k	11d ago	Apache-2.0	A	88	Codex
miniqmt-to-bigqmtlitaolemo/xtquant_big_convert	Skill	808	10d ago	MIT	A	144	Claude Code, Codex
ssquantsongshuquant/ssquant	Skill	123	16d ago	MIT	A	0	Claude Code, Codex
tushareskloxo/TideTrading	Skill	14	7d ago	MIT	A	79	Claude Code, Codex

optimizer: Skill for Claude Code