Midpoint over period
AI agents call technicalIndicators_midpoint to retrieve information from MCP Avantage without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool computes and returns a technical indicator metric without modifying data, executing code, making financial transactions, or deleting anything. It is a pure data retrieval and calculation function typical of financial data APIs. Low severity because misuse would only result in incorrect analysis, not financial loss or data modification.
From the tool's definition Tool name 'technicalIndicators_midpoint' with description 'Midpoint over period' indicates a technical analysis calculation that retrieves and computes a standard financial indicator (midpoint/average) over a specified time window.
Attacks that exploit this kind of access
Midpoint over period. It is categorised as a Read tool in the MCP Avantage MCP Server, which means it retrieves data without modifying state.
Register the MCP Avantage MCP server in PolicyLayer and add a rule for technicalIndicators_midpoint: 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 MCP Avantage. Nothing to install.
technicalIndicators_midpoint is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the technicalIndicators_midpoint 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 technicalIndicators_midpoint. 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.
technicalIndicators_midpoint is provided by the MCP Avantage MCP server (missionsquad/mcp-avantage). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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