Show daily spending trend as a text chart.
AI agents call cost_trend to retrieve information from Agent Cost without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and displays historical cost data in chart form. It has no side effects: it neither modifies budget data, executes external operations, nor deletes records. The data displayed is derived from existing logs (likely created by log_cost). It is a pure read operation that presents analytics without altering state.
From the tool's definition Tool is described as 'Show daily spending trend as a text chart' — a retrieval and visualization operation with no modification, deletion, or execution capability.
Attacks that exploit this kind of access
Show daily spending trend as a text chart. It is categorised as a Read tool in the Agent Cost MCP Server, which means it retrieves data without modifying state.
Register the Agent Cost MCP server in PolicyLayer and add a rule for cost_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 Agent Cost. Nothing to install.
cost_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 cost_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 cost_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.
cost_trend is provided by the Agent Cost MCP server (vanthienha199/agent-cost-mcp). 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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