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 staskh/trading_skills --skill option-chaingit clone --depth 1 https://github.com/staskh/trading_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/staskh/trading_skills/option-chain)<a href="https://agentmods.dev/skills/staskh/trading_skills/option-chain"><img src="https://agentmods.dev/badge/skills/staskh/trading_skills/option-chain/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/staskh/trading_skills/option-chain"><img src="https://agentmods.dev/badge/skills/staskh/trading_skills/option-chain.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 | $0.00050 | $0.00357 |
| Opus 5 | $0.00025 | $0.00179 |
| Sonnet 5 | $0.00010 | $0.00071 |
| Haiku 4.5 | $0.00005 | $0.00036 |
Grade A, and why
option-chain 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 9d 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.
What it actually says
Option Chain
Fetch option chain data from Yahoo Finance for a specific expiration date.
Instructions
Note: If
uvis not installed orpyproject.tomlis not found, replaceuv run pythonwithpythonin all commands below.
First, get available expiration dates:
uv run python scripts/options.py SYMBOL --expiries
Then fetch the chain for a specific expiry:
uv run python scripts/options.py SYMBOL --expiry YYYY-MM-DD
Arguments
SYMBOL- Ticker symbol (e.g., AAPL, SPY, TSLA)--expiries- List available expiration dates only--expiry YYYY-MM-DD- Fetch chain for specific date
Output
Returns JSON with:
calls- Array of call options with strike, bid, ask, volume, openInterest, impliedVolatilityputs- Array of put options with same fieldsunderlying_price- Current stock price for reference
Present data as a table. Highlight high volume/OI strikes and notable IV levels.
Dependencies
pandasyfinance
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.
What ships with it
1 file 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.
- 9d ago First seen · 48 lines · 50 tokens per session scan A c074fca8a2f0
option-chain is a skill published in the GitHub repository staskh/trading_skills (362 stars, last pushed 8d ago), licensed MIT. It adds 50 tokens to every session and 357 once invoked, about $0.0003 per session on Opus 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.
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