Agent skill

Yfinance

by SilvioBaratto in SilvioBaratto/optimizer

Load proactively whenever the user works with yfinance or Yahoo Finance data — pulling price history, fetching financials or analyst data, screening stocks / funds / ETFs, streaming real-time…

Custom licenceAuto-check: notesBusiness, Finance & HR

Install Yfinance

skills CLI

$ npx skills add SilvioBaratto/optimizer --skill yfinance -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install SilvioBaratto/optimizer yfinance --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/SilvioBaratto/optimizer.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/yfinance .claude/skills/yfinance && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "yfinance" agent skill from https://github.com/SilvioBaratto/optimizer/tree/development/.claude/skills/yfinance into .claude/skills/yfinance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "yfinance", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/SilvioBaratto/optimizer/tree/development/.claude/skills/yfinance

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add SilvioBaratto/optimizer --skill yfinance -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install SilvioBaratto/optimizer yfinance --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/SilvioBaratto/optimizer.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/yfinance .agents/skills/yfinance && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "yfinance" agent skill from https://github.com/SilvioBaratto/optimizer/tree/development/.claude/skills/yfinance into .agents/skills/yfinance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "yfinance", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add SilvioBaratto/optimizer --skill yfinance -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install SilvioBaratto/optimizer yfinance --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/SilvioBaratto/optimizer.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/yfinance .cursor/skills/yfinance && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "yfinance" agent skill from https://github.com/SilvioBaratto/optimizer/tree/development/.claude/skills/yfinance into .cursor/skills/yfinance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "yfinance", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/SilvioBaratto/optimizer.git --path .claude/skills/yfinance

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add SilvioBaratto/optimizer --skill yfinance -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install SilvioBaratto/optimizer yfinance --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/SilvioBaratto/optimizer.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/yfinance .gemini/skills/yfinance && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "yfinance" agent skill from https://github.com/SilvioBaratto/optimizer/tree/development/.claude/skills/yfinance into .gemini/skills/yfinance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "yfinance", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install SilvioBaratto/optimizer yfinance

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add SilvioBaratto/optimizer --skill yfinance -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/SilvioBaratto/optimizer.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/yfinance .github/skills/yfinance && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "yfinance" agent skill from https://github.com/SilvioBaratto/optimizer/tree/development/.claude/skills/yfinance into .github/skills/yfinance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "yfinance", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add SilvioBaratto/optimizer --skill yfinance -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install SilvioBaratto/optimizer yfinance --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/SilvioBaratto/optimizer.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/yfinance .opencode/skills/yfinance && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "yfinance" agent skill from https://github.com/SilvioBaratto/optimizer/tree/development/.claude/skills/yfinance into .opencode/skills/yfinance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "yfinance", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: yfinance
GitHub stars: 176
Token cost: ~4k tokens
SKILL.md length: 1,424 words
Files: 11 (incl. references)
Skills in repo: 10
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: Custom licence

At a glance

Load proactively whenever the user works with yfinance or Yahoo Finance data — pulling price history, fetching financials or analyst data, screening stocks / funds / ETFs, streaming real-time…

Works in 12 steps: Period ↔ interval limits are enforced… → download() defaults differ from… → Multi-level columns when tickers is a… → …
Works with yfinance
SKILL.md covers Where to look, Official documentation, Architecture and Decision guide, plus 6 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Yfinance is an agent skill from SilvioBaratto/optimizer. Load proactively whenever the user works with yfinance or Yahoo Finance data — pulling price history, fetching financials or analyst data, screening stocks / funds / ETFs, streaming real-time quotes, or inspecting sector, industry, or fund rollups. Do not wait to be asked; apply this skill automatically whenever the user mentions yfinance, Yahoo Finance, OHLCV, stock data, ticker info, earnings estimates, valuation measures, an equity or ETF screener, or real-time quote streaming. Covers yfinance 1.6.0 (Aug…

Its SKILL.md is about 4k tokens, which your agent loads only when the skill is triggered. The skill folder holds 11 other files, including reference files (for example `PATTERNS.md`, `references/analysis.md` and `references/config.md`).

It sits in Business, Finance & HR, covering Stock and market analysis. It works with yfinance. The repository describes itself as: Quantitative portfolio construction and optimization platform built on skfolio and scikit-learn.

When your agent uses it

Works with yfinance
Yahoo Finance data — pulling price history
Fetching financials
Screening stocks / funds / ETFs

Example prompts

“/yfinance”

Requirements

Python 3
Pre-approved tools (allowed-tools): Read, Write, Edit, Glob, Grep, Bash, WebFetch, WebSearch, mcp__ide__getDiagnostics

Workflow steps

12 steps, taken from the first numbered list in SKILL.md.

Period ↔ interval limits are enforced silently. 1m → max 7 days, 2m–90m → 60 days, 1h → 730 days, 1d+ → full history. Intraday cannot…
download() defaults differ from history(). download() uses actions=False (no dividends/splits columns unless you pass actions=True)…
Multi-level columns when tickers is a list. multi_level_index=True by default (even for a single ticker in download). Use…
pandas 3+ read-only errors: history() output is memory-consolidated since v1.2.0. Call .copy() before mutating in place. (1.6.0 fixed an…
Screener fields don't cross classes. Passing an equity field to FundQuery raises ValueError. Pick the right *Query class first; inspect…
screen() uses camelCase sort params and split size/count. It is screen(query, sortField=…, sortAsc=…, size=…, count=…, offset=…) — not…
WebSocket — no run() / on_message attribute. Use ws.subscribe([...]) then ws.listen(handler) (handler is an optional arg to listen, not an…
Fund data lives under ticker.funds_data (a FundsData object), not flat ticker.fund_* properties. Populated only for ETFs / mutual funds…
proxy is no longer a per-call or constructor argument (removed across the 1.4.x–1.6.0 line). Configure proxy globally via yfinance config…
curl_cffi is OPTIONAL since v1.4.0 — yfinance falls back to requests if it's absent. Do not treat it as required. If you do install it…
download() is reentrant since v1.4.0 (shared module globals removed) — safe from async workers / worker pools. ignore_tz=False returns the…
ticker.info is slow and flaky — it scrapes Yahoo's quote page. Prefer fast_info, valuation, or the dedicated financials/analysis…

What it can do on your machine

Read from SKILL.md and the folder at commit 63e897b. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
- Read
- Write
- Edit
- Glob
- Grep
- Bash
- WebFetch
- WebSearch
- mcp__ide__getDiagnostics
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are python).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
- ranaroussi.github.io
- github.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Yfinance loads about 4k tokens when it runs, and up to ~15k if it reads all its reference files. Until then it costs about 228 tokens; SKILL.md has 1,424 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~228
When it runs · the whole SKILL.md, loaded when a task matches: ~4k
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~15k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

NotePre-approves every shell command (allowed-tools: Bash)SKILL.md

allowed-tools: Read, Write, Edit, Glob, Grep, Bash, WebFetch, WebSearch, mcp__ide__getDiagnostics

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,424 words (~3,961 tokens).

“Expert guidance for yfinance — a Python library for retrieving financial data from Yahoo Finance.”

— opening of SKILL.md by SilvioBaratto, Custom licence

name: yfinance
allowed-tools: Read, Write, Edit, Glob, Grep, Bash, WebFetch, WebSearch, mcp__ide__getDiagnostics

Read the full SKILL.md on GitHub

Files

SKILL.md and 10 other files (references) in .claude/skills/yfinance of SilvioBaratto/optimizer.

SKILL.md
PATTERNS.md
references/analysis.md
references/config.md
references/financials.md
references/funds.md
references/market_search.md
references/price_history.md
references/screener.md
references/ticker.md
references/websocket.md

Open the folder on GitHubat commit 63e897b

Compare with similar skills

Yfinance next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Yfinance compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Yfinance this skillSilvioBaratto/optimizer	176	—	~4k	Automated safety check: Notes	Custom licence	yesterday
Stock Analysis24mlight/StockClaw	101	2 repos	~2k	Automated safety check: Notes	MIT	6 mo ago
Regimejackson-video-resources/markov-hedge-fund-method	483	—	~1.6k	Automated safety check: Pass	Custom licence	4 mo ago
Stock Value AnalyzerFunnyKun/stock-value-analyzer	140	—	~3.3k	Automated safety check: Pass	None	3 mo ago
Yahoo Finance24mlight/StockClaw	101	2 repos	~1.1k	Automated safety check: Notes	MIT	6 mo ago
Stock Analysisliusai0820/Stock-Analysis-Skill	141	—	~904	Automated safety check: Notes	None	7 mo ago

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Business, Finance & HRAuto-check passed

Questions about Yfinance

What does Yfinance do?

Load proactively whenever the user works with yfinance or Yahoo Finance data — pulling price history, fetching financials or analyst data, screening stocks / funds / ETFs, streaming real-time…. Yfinance is an agent skill from SilvioBaratto/optimizer. Load proactively whenever the user works with yfinance or Yahoo Finance data — pulling price history, fetching financials or analyst data, screening stocks / funds / ETFs, streaming real-time quotes, or inspecting sector, industry, or fund rollups.

When should I use Yfinance?

Yfinance fits situations like: works with yfinance; yahoo Finance data — pulling price history; fetching financials; screening stocks / funds / ETFs.

How do I install Yfinance in Claude Code?

Run `npx skills add SilvioBaratto/optimizer --skill yfinance -a claude-code`. Or copy the skill folder (.claude/skills/yfinance in SilvioBaratto/optimizer) into .claude/skills/yfinance in your project. Claude Code loads it when a task matches its description.

How do I install Yfinance in Codex?

Run `npx skills add SilvioBaratto/optimizer --skill yfinance -a codex`. Or copy the skill folder (.claude/skills/yfinance in SilvioBaratto/optimizer) into .agents/skills/yfinance in your project. Codex loads it when a task matches its description.

Can I use Yfinance in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add SilvioBaratto/optimizer --skill yfinance -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/yfinance, .gemini/skills/yfinance, .github/skills/yfinance and .opencode/skills/yfinance in your project.

What does Yfinance need to run?

SKILL.md names no scripts, command-line tools or credentials: Yfinance is instructions for the agent only. Our summary lists: Python 3. Its frontmatter pre-approves these tools: Read, Write, Edit, Glob, Grep, Bash, WebFetch, WebSearch, mcp__ide__getDiagnostics.

Does Yfinance access the network?

SKILL.md names 2 domains. As links in the text: ranaroussi.github.io and github.com. This is read from the text; nothing was executed.

Is Yfinance safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Yfinance use?

Yfinance has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Yfinance use?

About 4k tokens (SKILL.md is roughly 16k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 11k tokens, read only when the agent opens those files.

What are the alternatives to Yfinance?

Skills that share tags, products or a category with Yfinance: Stock Analysis (24mlight/StockClaw, 101 stars), Regime (jackson-video-resources/markov-hedge-fund-method, 483 stars), Stock Value Analyzer (FunnyKun/stock-value-analyzer, 140 stars) and Yahoo Finance (24mlight/StockClaw, 101 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Yfinance?

SilvioBaratto (a GitHub user) maintains it in SilvioBaratto/optimizer, which has 176 GitHub stars. The repository holds 10 skills in this directory. The repository was last updated on October 7, 2026.

Source: SilvioBaratto/optimizer on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Yfinance

Install Yfinance

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

Stock Analysis

Regime

Stock Value Analyzer

Yahoo Finance

Stock Analysis

B3 Analysis

More from SilvioBaratto/optimizer

DB Context

Fund Orchestration

Optimization Objective Map

Macro Regime Read

Rebalancing Execution

Risk Limits Check

Questions about Yfinance

Install Yfinance

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

More from SilvioBaratto/optimizer

Related

Questions about Yfinance