Get income vs expense trend for the last N days.
AI agents call get_cashflow_trend to retrieve information from Corpus MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and analyzes existing cashflow data to generate trends. It performs no side effects, creates no transactions, executes no code, and deletes nothing. While it accesses financial information (which could be sensitive), the operation itself is read-only and carries minimal risk if misused—at worst, an AI agent would read data it shouldn't have access to, not cause financial harm or data loss.
From the tool's definition Tool name 'get_cashflow_trend' and description 'Get income vs expense trend for the last N days' indicate a retrieval/query operation that returns historical financial trend data without modifying, executing external operations, or deleting anything.
Attacks that exploit this kind of access
Get income vs expense trend for the last N days. It is categorised as a Read tool in the Corpus MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Corpus MCP Server MCP server in PolicyLayer and add a rule for get_cashflow_trend: 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 Corpus MCP Server. Nothing to install.
get_cashflow_trend 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 get_cashflow_trend 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 get_cashflow_trend. 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.
get_cashflow_trend is provided by the Corpus MCP Server MCP server (mathankarthik18/corpus-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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