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 ib-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/ib-option-chain)<a href="https://agentmods.dev/skills/staskh/trading_skills/ib-option-chain"><img src="https://agentmods.dev/badge/skills/staskh/trading_skills/ib-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/ib-option-chain"><img src="https://agentmods.dev/badge/skills/staskh/trading_skills/ib-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 | $0.00084 | $0.00896 |
| Opus 5 | $0.00042 | $0.00448 |
| Sonnet 5 | $0.00017 | $0.00179 |
| Haiku 4.5 | $0.00008 | $0.00090 |
Grade A, and why
ib-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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.
IB Option Chain
Fetch option chain data from Interactive Brokers for a specific expiration date.
Handles equities/ETFs (Stock/OPT) and futures options (FOP). The asset type and
exchange are resolved from IB contract details (no hardcoded symbol table): auto-detect
tries a SMART stock first and falls back to a future when no stock exists (so NQ, GC,
RTY resolve as futures, while AAPL resolves as a stock even though it has an obscure
single-stock future). Tickers that are both a stock and a futures root (e.g. ES=Eversource,
CL=Colgate) default to the equity — pass --sec-type fut to force the future.
IB Connection
TWS or IB Gateway must be running locally with API enabled:
- Paper trading — port 7497
- Live trading — port 7496
IB_PORTenv var — default port when--portis omitted (e.g.IB_PORT=4001for a Gateway container). Precedence:--portflag >IB_PORT> built-in default. Set it in the shell or a.envfile.
Port fallback: If the configured port fails, automatically retry on the other port. If the retry succeeds, save to memory which account type worked (live/paper) and reuse it for all IB skill calls in this and future sessions — until the user explicitly asks for the other account. If both ports fail, ask the user to verify that TWS or IB Gateway is running with API access enabled.
Instructions
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 YYYYMMDD
Arguments
SYMBOL- Ticker symbol. Equity/ETF (e.g., AAPL, SPY, TSLA) or futures root (e.g., NQ, ES, CL, GC) — asset type is auto-detected via IB.--sec-type {stk,fut}- Force the asset type. Default: auto-detect (stock-first). Usefutfor ambiguous roots like ES/CL when you mean the future.--expiries- List available expiration dates only--expiry YYYYMMDD- Fetch chain for specific date (IB format: YYYYMMDD, no dashes)--port- IB port (default: 7497 for paper trading)
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.
- 12d ago First seen · 68 lines · 84 tokens per session scan A 43e4b6f94056
ib-option-chain is a skill published in the GitHub repository staskh/trading_skills (364 stars, last pushed 11d ago), licensed MIT. It adds 84 tokens to every session and 896 once invoked, about $0.0004 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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