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 alpacahq/alpaca-skills --skill trading-ordersgit clone --depth 1 https://github.com/alpacahq/alpaca-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/alpacahq/alpaca-skills/trading-orders)<a href="https://agentmods.dev/skills/alpacahq/alpaca-skills/trading-orders"><img src="https://agentmods.dev/badge/skills/alpacahq/alpaca-skills/trading-orders/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/alpacahq/alpaca-skills/trading-orders"><img src="https://agentmods.dev/badge/skills/alpacahq/alpaca-skills/trading-orders.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 | $0.00074 | $0.02507 |
| Opus 5 | $0.00037 | $0.01254 |
| Sonnet 5 | $0.00015 | $0.00501 |
| Haiku 4.5 | $0.00007 | $0.00251 |
Grade A, and why
alpaca-broker-trading-orders 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 11d 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 — 115 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Alpaca Broker API — Trading on Behalf of Accounts
Place, modify, cancel, and track orders for an end-user account, and read positions & buying power. The defining feature of Broker API trading: account_id is in the path — you act for a user account, not your own.
Read
alpaca-broker-integrationfirst. Broker API + HTTP Basic auth. (The standalone Trading API uses/v2/orderswith no account in the path; everything else here transfers.)
Reference
- Guides:
https://docs.alpaca.markets/docs/orders-at-alpaca,https://docs.alpaca.markets/docs/fractional-trading - API ref:
https://docs.alpaca.markets/reference/postorder - Live schema:
alpaca-docsMCP →get-endpointtitle"Broker API"path/v1/trading/accounts/{account_id}/orders
1. Endpoints
| Method | Path | Purpose |
|---|---|---|
| POST | /v1/trading/accounts/{id}/orders |
Create order |
| GET | /v1/trading/accounts/{id}/orders |
List orders (filter by status, symbols, after…) |
| GET | /v1/trading/accounts/{id}/orders/{order_id} |
Get order by ID |
| GET | /v1/trading/accounts/{id}/orders:by_client_order_id?client_order_id=… |
Get by your client ID |
| PATCH | /v1/trading/accounts/{id}/orders/{order_id} |
Replace (modify) order |
| DELETE | /v1/trading/accounts/{id}/orders/{order_id} |
Cancel one order (204) |
| DELETE | /v1/trading/accounts/{id}/orders |
Cancel all (207 Multi-Status) |
| POST | /v1/trading/accounts/{id}/orders/estimation |
Cost-estimate an order |
| GET / DELETE | /v1/trading/accounts/{id}/positions[/{symbol_or_asset_id}] |
List / close positions |
| GET | /v1/trading/accounts/{id}/account |
Trading-account details (buying power etc.) |
2. Create-order request
Schema-required: type and time_in_force. Conditionally required: symbol, side, and exactly one of qty/notional.
// notional market buy (dollar-based, fractional)
{ "symbol": "AAPL", "notional": "25.00", "side": "buy", "type": "market", "time_in_force": "day",
"client_order_id": "your-own-uuid" }
// limit qty sell
{ "symbol": "AAPL", "qty": "3", "side": "sell", "type": "limit", "limit_price": "190.00", "time_in_force": "gtc" }
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.
- 11d ago First seen · 115 lines · 74 tokens per session scan A 6b36ce42290d
alpaca-broker-trading-orders is a skill published in the GitHub repository alpacahq/alpaca-skills (147 stars, last pushed 3d ago), licensed Apache-2.0. It adds 74 tokens to every session and 2,507 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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