Subtract one region from another. 从当前ROI区域中减去输入的ROI区域。 The new region contains the parts of the original region that are not in the other region. 新的区域包含原始区域中不在另一个区域中的部分。 If a non-empty region is subtracted by an empty region, a copy of the original region is returned. 一个非空区域减去空区域，获得该区域对象的拷贝。 If a...
AI agents use il_region_subtract to create or update resources in Leaper Vision Toolkit — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Leaper Vision Toolkit environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
regionClassObjDescriptionJson | string | — | 原始的Roi区域。传入一个序列化的JSON字符串，属性包括：LpvClassName(调用工具函数的名称) 和 InputParameterFile(调用工具函数需要传入的参数文件名称)。这两个属性的值可以从前处理的MCP工具的返回值中获取。LpvClassName 表示要调用的Region接口名称，根据不同的区域类型 |
otherRegionClassObjDescriptionJson | string | — | 输入用于减去的ROI区域。传入一个序列化的JSON字符串，属性包括：LpvClassName(调用工具函数的名称) 和 InputParameterFile(调用工具函数需要传入的参数文件名称)。这两个属性的值可以从前处理的MCP工具的返回值中获取。LpvClassName 表示要调用的Region接口名称，根据不同的 |
Parameters from the server's own tool schema.
This tool creates or modifies region objects through set operations (subtraction), producing new ROI (Region of Interest) definitions. The operation is reversible—the original regions remain unchanged and a new derived region is returned.
From the tool's definition Tool performs region subtraction operations that create and modify region objects: 'Subtract one region from another', 'The new region contains...', 'a copy of the original region is returned', 'outputs a new compound ROI region object'.
Attacks that exploit this kind of access
Subtract one region from another. 从当前ROI区域中减去输入的ROI区域。 The new region contains the parts of the original region that are not in the other region. 新的区域包含原始区域中不在另一个区域中的部分。 If a non-empty region is subtracted by an empty region, a copy of the original region is returned. 一个非空区域减去空区域，获得该区域对象的拷贝。 If an empty region is subtracted by a non-empty region, the complement of the other region is returned. 一个空区域减去一个非空区域，获得后者的取反区域。 并输出一个新的复合ROI区域对象(ILCompoundRegion类型)的描述JSON。 其中ILCompoundRegion类型继承于ILRegion类型. It is categorised as a Write tool in the Leaper Vision Toolkit MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
il_region_subtract accepts 2 parameters: regionClassObjDescriptionJson, otherRegionClassObjDescriptionJson. The full parameter table on this page comes from the server's own tool schema.
Register the Leaper Vision Toolkit MCP server in PolicyLayer and add a rule for il_region_subtract: 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 Leaper Vision Toolkit. Nothing to install.
il_region_subtract is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the il_region_subtract 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 il_region_subtract. 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.
il_region_subtract is provided by the Leaper Vision Toolkit MCP server (leaper-mcp/leaper-mcp-proxy). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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