Calculate the short perpetual futures position size needed to hedge a spot holding. Use when user asks "how much should I short to hedge my BTC?" or "what margin do I need for a 100% hedge?". Returns: hedgeNotional, requiredMargin, estimatedFundingCost.
Part of the TradingCalc MCP — Crypto Futures Math server.
Free to start. No card required.
AI agents invoke primitive.hedge_ratio to trigger processes or run actions in TradingCalc MCP — Crypto Futures Math. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
primitive.hedge_ratio can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
{
"version": "1",
"default": "deny",
"tools": {
"primitive.hedge_ratio": {
"limits": [
{
"counter": "primitive.hedge_ratio_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full TradingCalc MCP — Crypto Futures Math policy for all 19 tools.
These attack patterns abuse exactly the kind of access primitive.hedge_ratio gives an agent. Each links to the full case and the policy that stops it:
Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Calculate the short perpetual futures position size needed to hedge a spot holding. Use when user asks "how much should I short to hedge my BTC?" or "what margin do I need for a 100% hedge?". Returns: hedgeNotional, requiredMargin, estimatedFundingCost.. It is categorised as a Execute tool in the TradingCalc MCP — Crypto Futures Math MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the TradingCalc MCP — Crypto Futures Math MCP server in PolicyLayer and add a rule for primitive.hedge_ratio: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches TradingCalc MCP — Crypto Futures Math. Nothing to install.
primitive.hedge_ratio is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the primitive.hedge_ratio rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for primitive.hedge_ratio. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
primitive.hedge_ratio is provided by the TradingCalc MCP — Crypto Futures Math MCP server (https://tradingcalc.io/api/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 19 TradingCalc MCP — Crypto Futures Math tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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