Basis

position_calculate

Read-onlyIdempotent

Risk-first position sizing with quantity, notional, margin, effective leverage, fees, funding, breakeven, liquidation estimate, target R multiples and warnings. Use position_plan_on_chart instead when the user should see the plan on the chart.

Input Schema

TableJSON Schema

Name	Required	Description
`side`	Yes
`stop`	Yes
`entry`	Yes
`equity`	Yes	Account equity in quote currency.
`feeBps`	No	Fee per side in basis points. Default 4.
`targets`	No	Take-profit prices and the percentage closed at each. Allocations should total 100.
`leverage`	No	Selected venue leverage. Default 1.
`fundingRate`	No	Funding per settlement as a fraction, e.g. 0.0001.
`riskPercent`	Yes	Equity risked if the stop fills, in percent.
`holdingHours`	No	Expected holding time for the funding estimate.
`fundingPerDay`	No	Funding settlements per day. Default 3.
`maintenanceMarginRate`	No	Fraction used for approximate liquidation. Default 0.005.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 11, 2026

changedInput schema / required

Previous value: -[
-  "side",
-  "equity",
-  "riskPercent",
-  "entry",
-  "stop",
-  "targets"
-]New value: +[
+  "side",
+  "equity",
+  "riskPercent",
+  "entry",
+  "stop"
+]

First observedSep 20, 2026

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