Agent skill

Whale Hunting

Detect institutional whale activity in options for a given underlying.

MITAuto-check passedBusiness, Finance & HR

Install Whale Hunting

skills CLI

$ npx skills add staskh/trading_skills --skill whale-hunting -a claude-code

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

GitHub CLI

$ gh skill install staskh/trading_skills whale-hunting --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/staskh/trading_skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/whale-hunting .claude/skills/whale-hunting && 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 "whale-hunting" agent skill from https://github.com/staskh/trading_skills/tree/main/.claude/skills/whale-hunting into .claude/skills/whale-hunting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "whale-hunting", 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/staskh/trading_skills/tree/main/.claude/skills/whale-hunting

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 staskh/trading_skills --skill whale-hunting -a codex

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

GitHub CLI

$ gh skill install staskh/trading_skills whale-hunting --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/staskh/trading_skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/whale-hunting .agents/skills/whale-hunting && 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 "whale-hunting" agent skill from https://github.com/staskh/trading_skills/tree/main/.claude/skills/whale-hunting into .agents/skills/whale-hunting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "whale-hunting", 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 staskh/trading_skills --skill whale-hunting -a cursor

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

GitHub CLI

$ gh skill install staskh/trading_skills whale-hunting --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/staskh/trading_skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/whale-hunting .cursor/skills/whale-hunting && 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 "whale-hunting" agent skill from https://github.com/staskh/trading_skills/tree/main/.claude/skills/whale-hunting into .cursor/skills/whale-hunting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "whale-hunting", 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/staskh/trading_skills.git --path .claude/skills/whale-hunting

--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 staskh/trading_skills --skill whale-hunting -a gemini-cli

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

GitHub CLI

$ gh skill install staskh/trading_skills whale-hunting --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/staskh/trading_skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/whale-hunting .gemini/skills/whale-hunting && 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 "whale-hunting" agent skill from https://github.com/staskh/trading_skills/tree/main/.claude/skills/whale-hunting into .gemini/skills/whale-hunting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "whale-hunting", 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 staskh/trading_skills whale-hunting

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 staskh/trading_skills --skill whale-hunting -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/staskh/trading_skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/whale-hunting .github/skills/whale-hunting && 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 "whale-hunting" agent skill from https://github.com/staskh/trading_skills/tree/main/.claude/skills/whale-hunting into .github/skills/whale-hunting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "whale-hunting", 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 staskh/trading_skills --skill whale-hunting -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 staskh/trading_skills whale-hunting --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/staskh/trading_skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/whale-hunting .opencode/skills/whale-hunting && 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 "whale-hunting" agent skill from https://github.com/staskh/trading_skills/tree/main/.claude/skills/whale-hunting into .opencode/skills/whale-hunting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "whale-hunting", 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: whale-hunting
GitHub stars: 376
Token cost: ~1.1k tokens
SKILL.md length: 384 words
Files: 2 (incl. scripts)
Skills in repo: 28
Repo updated: Sep 28, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Detect institutional whale activity in options for a given underlying.

Works in 2 steps: Crude scan (Yahoo Finance) — finds… → Precise drill-down (Massive API) —…
The user asks about unusual options activity
SKILL.md covers Instructions, Arguments, Output and Examples, plus 3 more sections
Runs Python scripts from its folder; calls uv; needs MASSIVE_API_KEY

What it does

Whale Hunting is an agent skill from staskh/trading_skills. Detect institutional whale activity in options for a given underlying. Use when the user asks about unusual options activity, large block trades, whale trades, or institutional options flow for a specific symbol.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including scripts (for example `scripts/whale_hunting.py`).

It sits in Business, Finance & HR. The repository describes itself as: Claude powered advisor system for option traders. The licence is MIT.

When your agent uses it

The user asks about unusual options activity
Large block trades
Institutional options flow for a specific symbol

Example prompts

“/whale-hunting”

Requirements

Python 3
A credential in MASSIVE_API_KEY

Workflow steps

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

Crude scan (Yahoo Finance) — finds contracts with anomalous daily investment vs the rest of the chain.
Precise drill-down (Massive API) — fetches per-second bars for each candidate and flags seconds with outlier dollar invested.

What it can do on your machine

Read from SKILL.md and the folder at commit b71a74f. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
- uv
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use uv, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
- MASSIVE_API_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Whale Hunting loads about 1.1k tokens when it runs. Until then it costs about 57 tokens; SKILL.md has 384 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~57
When it runs · the whole SKILL.md, loaded when a task matches: ~1.1k

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 passed

The automated check found no risky patterns in SKILL.md.

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); the scripts in this folder are not scanned.

SKILL.md

The full file from staskh/trading_skills at commit b71a74f, republished under its MIT licence (© staskh). 384 words, ~1,057 tokens.

Download SKILL.mdSave it as .claude/skills/whale-hunting/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.

name: whale-hunting
description: Detect institutional whale activity in options for a given underlying. Use when the user asks about unusual options activity, large block trades, whale trades, or institutional options flow for a specific symbol.
dependencies: trading-skills

Whale Hunting

Scans option chains for a given underlying to identify institutional-sized trades using a two-step approach:

Crude scan (Yahoo Finance) — finds contracts with anomalous daily investment vs the rest of the chain.
Precise drill-down (Massive API) — fetches per-second bars for each candidate and flags seconds with outlier dollar invested.

Instructions

Note: If uv is not installed or pyproject.toml is not found, replace uv run python with python in all commands below.

bash

uv run python .claude/skills/whale-hunting/scripts/whale_hunting.py SYMBOL [--months N] [--date YYYY-MM-DD] [--sigma F] [--sigma-z F] [--summary]

Arguments

SYMBOL — Underlying ticker (e.g. AAPL, NVDA, SPY)
--months — Max months until option expiration to consider (default: 2)
--date — Trading date to analyze in YYYY-MM-DD format (default: latest trading day)
--sigma — Std-deviation multiplier for crude outlier threshold (default: 3.0)
--sigma-z — Modified Z-Score threshold for per-second small-sample detection (default: 3.5)
--summary — Also compute per-ticker summary and include it in the JSON output

Output

Returns JSON with:

underlying — The scanned symbol
trading_date — Date analyzed
source — "massive" (per-second data) or "yahoo only" (daily chain data)
total_whales — Total whale events found
total_call_invested — Sum of invested dollars in call whale events
total_put_invested — Sum of invested dollars in put whale events
call_put_ratio — Call invested / put invested (null if no puts)
whales — List of whale events:
- timestamp, ticker, type, strike, expiry
- close, volume, transactions, invested, break_even
summary (present only when --summary is passed) — List of per-ticker aggregates:
- ticker, type, strike, expiry, whale_count, total_invested, break_even

Examples

bash

# Hunt whales for AAPL (latest trading day)
uv run python .claude/skills/whale-hunting/scripts/whale_hunting.py AAPL

# Hunt whales for NVDA on a specific date
uv run python .claude/skills/whale-hunting/scripts/whale_hunting.py NVDA --date 2026-03-13

# With per-ticker summary
uv run python .claude/skills/whale-hunting/scripts/whale_hunting.py HOOD --months 3 --summary

# Looser detection threshold
uv run python .claude/skills/whale-hunting/scripts/whale_hunting.py SPY --sigma 2.0

Show full SKILL.md (162 more words)Show less

Reporting

After running the script, present the results as follows.

Header line:

Whale activity for {underlying} on {trading_date} — source: {source} Call flow: ${total_call_invested:,.0f} | Put flow: ${total_put_invested:,.0f} | C/P ratio: {call_put_ratio:.2f}

When --summary was requested, render the summary array as a table:

Time (ET)	Ticker	Type	Strike	Expiry	# Events	Total Invested	Break Even
{timestamp}	{ticker}	{type}	{strike}	{expiry}	{whale_count}	${total_invested:,.0f}	{break_even}

Sort by total_invested descending. For multi-event rows use the time range of first–last event (e.g. 11:46–12:33).

Interpretation guidance:

source: "massive" — High-confidence; per-second block trade data from Massive API
source: "yahoo only" — Fallback; daily-level data (Massive API key missing or no intraday data)
Low C/P ratio (< 0.5) — Bearish institutional positioning
High C/P ratio (> 2.0) — Bullish institutional positioning
transactions: 1 — Single block trade; strongest whale signal

Requirements

MASSIVE_API_KEY environment variable for per-second data. Without it, falls back to Yahoo Finance daily data.

Timezone

All timestamps and time-based calculations must use the America/New_York timezone. All JSON output must include generated_at (NY time string) and data_delay fields.

Files

SKILL.md and 1 other file (scripts) in .claude/skills/whale-hunting of staskh/trading_skills.

SKILL.md
scripts/whale_hunting.py

Open the folder on GitHubat commit b71a74f

Compare with similar skills

Whale Hunting 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.

Whale Hunting compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Whale Hunting this skillstaskh/trading_skills	376	—	~1.1k	Automated safety check: Pass	MIT	11 days ago
Technical Analysttradermonty/claude-trading-skills	3k	4 repos	~4.6k	Automated safety check: Pass	MIT	yesterday
Theme Detectortradermonty/claude-trading-skills	3k	2 repos	~4.9k	Automated safety check: Pass	MIT	yesterday
Creating Financial ModelsChen-zexi/open-ptc-agent	729	3 repos	~1.3k	Automated safety check: Pass	MIT	8 mo ago
Stock APIzhangxiangliang/stock-api	2k	—	~507	Automated safety check: Pass	MIT	today
Itr Walakaranb192/itr-wala	871	—	~3.6k	Automated safety check: Pass	MIT	6 days ago

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Questions about Whale Hunting

What does Whale Hunting do?

Detect institutional whale activity in options for a given underlying. Whale Hunting is an agent skill from staskh/trading_skills. Detect institutional whale activity in options for a given underlying.

When should I use Whale Hunting?

Whale Hunting fits situations like: the user asks about unusual options activity; large block trades; institutional options flow for a specific symbol.

How do I install Whale Hunting in Claude Code?

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

How do I install Whale Hunting in Codex?

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

Can I use Whale Hunting 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 staskh/trading_skills --skill whale-hunting -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/whale-hunting, .gemini/skills/whale-hunting, .github/skills/whale-hunting and .opencode/skills/whale-hunting in your project.

What does Whale Hunting need to run?

Going by SKILL.md and its folder, Whale Hunting needs Python for the scripts in its folder, the command-line tools its instructions call (uv) and credentials named MASSIVE_API_KEY. Our summary lists: Python 3; A credential in MASSIVE_API_KEY.

Does Whale Hunting access the network?

SKILL.md contains no URLs. Its commands use uv, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Whale Hunting safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Whale Hunting use?

Whale Hunting is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Whale Hunting use?

About 1.1k tokens (SKILL.md is roughly 4.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Whale Hunting?

Skills that share tags, products or a category with Whale Hunting: Technical Analyst (tradermonty/claude-trading-skills, 3k stars), Theme Detector (tradermonty/claude-trading-skills, 3k stars), Creating Financial Models (Chen-zexi/open-ptc-agent, 729 stars) and Stock API (zhangxiangliang/stock-api, 2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Whale Hunting?

staskh (a GitHub user) maintains it in staskh/trading_skills, which has 376 GitHub stars. The repository holds 28 skills in this directory. The repository was last updated on September 28, 2026.

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

Install Whale Hunting

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

Whale Hunting

Instructions

Arguments

Output

Examples

Reporting

Requirements

Timezone

Files

Compare with similar skills

Similar skills

More from staskh/trading_skills

Related

Questions about Whale Hunting