AI agents call foundry_call to retrieve information from HashPilot without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool explicitly performs read-only contract calls with no state changes and no gas cost. It is purely a query operation against the blockchain, similar to a view/pure function call. The description explicitly distinguishes it from state-changing operations (foundry_send).
From the tool's definition Call a contract function (read-only, no gas cost). Uses cast call.
Attacks that exploit this kind of access
Call a contract function (read-only, no gas cost). Uses cast call. For state-changing transactions, use foundry_send. It is categorised as a Read tool in the HashPilot MCP Server, which means it retrieves data without modifying state.
Register the HashPilot MCP server in PolicyLayer and add a rule for foundry_call: 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 HashPilot. Nothing to install.
foundry_call 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 foundry_call 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 foundry_call. 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.
foundry_call is provided by the HashPilot MCP server (justmert/hashpilot). 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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