Is the Fundamentals skill free?

Yes. The skill itself is free from staskh/trading_skills. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Fundamentals SkillProof Score?

8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 4/5.

How do I install Fundamentals?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Fundamentals with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Fundamentals

Fetch live company fundamentals and compute a Piotroski F-Score from Yahoo Finance

by staskh · staskh/trading_skills

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 8.8/10
Tested: Jul 31, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · 93971e8

Cloned the repo, ran `uv sync`, and executed both referenced scripts on AAPL. `fundamentals.py AAPL --type info` returned live JSON (market cap 4,537,070,911,488; trailing PE 35.34; EPS 8.74; generated_at NY timestamp). `piotroski.py AAPL` computed a full 9/9 F-Score with per-criterion YoY figures (e.g. LT debt 78,328,000,000 vs 85,750,000,000) and interpretation "Excellent". Baseline-from-memory could only guess ~$3.5T market cap and could NOT produce an F-Score at all — the live figures and computed 9-criterion score are the concrete delta. Both scripts fetched HTTP 200; no security smells. Real friction: scripts import the `trading_skills` package, so a bare skill-dir copy is non-functional until `pip install trading-skills` (or repo `uv sync`) is run.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 8/10
Docs & honesty 4/5

What Fundamentals does

Pulls fundamental financial data (key metrics, income statement, earnings estimates) for a ticker from Yahoo Finance and computes Piotroski's 9-criterion F-Score for financial-strength screening. Triggers when a user asks about a company's financials, earnings, revenue, profit, balance sheet, income statement, or overall fundamental health. Requires the trading-skills Python package (yfinance/pandas) installed.

How to install Fundamentals

git clone --depth 1 https://github.com/staskh/trading_skills.git /tmp/fundamentals-src
mkdir -p ~/.claude/skills
cp -R /tmp/fundamentals-src/.claude/skills/fundamentals ~/.claude/skills/fundamentals
# The scripts import the `trading_skills` package (yfinance + pandas) — install it or they fail:
#   pip install trading-skills           # standalone
#   # OR run from a checkout of the repo with: cd /tmp/fundamentals-src && uv sync
# Then invoke, e.g.:
#   uv run python ~/.claude/skills/fundamentals/scripts/fundamentals.py AAPL --type info
#   uv run python ~/.claude/skills/fundamentals/scripts/piotroski.py AAPL
# Data source: Yahoo Finance (no API key). Requires Python 3.12+.

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Fundamentals

/fundamentals Fetch live company fundamentals and compute a Piotroski F-Score from Yahoo Finance

It also activates on plain-language prompts like these:

Show the balance sheet for this company
Get quarterly revenue and profit figures
Pull fundamental metrics for this stock

Frequently asked questions

Is the Fundamentals skill free?: Yes. The skill itself is free from staskh/trading_skills. SkillProof publishes the install command and an independent test verdict at no cost.
Does Fundamentals work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 31, 2026. Verdict: Tested · Works. Cloned the repo, ran `uv sync`, and executed both referenced scripts on AAPL. `fundamentals.py AAPL --type info` returned live JSON (market cap 4,537,070,911,488; trailing PE 35.34; EPS 8.74; generated_at NY timestamp). `piotroski.py AAPL` computed a full 9/9 F-Score with per-criterion YoY figures (e.g. LT debt 78,328,000,000 vs 85,750,000,000) and interpretation "Excellent". Baseline-from-memory could only guess ~$3.5T market cap and could NOT produce an F-Score at all — the live figures and computed 9-criterion score are the concrete delta. Both scripts fetched HTTP 200; no security smells. Real friction: scripts import the `trading_skills` package, so a bare skill-dir copy is non-functional until `pip install trading-skills` (or repo `uv sync`) is run.
What is the Fundamentals SkillProof Score?: 8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 4/5.
How do I install Fundamentals?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Fundamentals with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.