AI agents call cast_chain to retrieve information from Foundry 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 blockchain chain information (likely chain ID, name, or network details) with no side effects, data modifications, or external operations. It is purely informational and defensive in nature. The 'get' verb pattern and read-only semantics place it squarely in the Read category with low severity.
From the tool's definition Tool name 'cast_chain' combined with description 'Get information about the current chain' indicates a query operation that retrieves chain metadata without modifying state.
Documented attack patterns abuse exactly the kind of access cast_chain gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Foundry MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for cast_chain:
{
"version": "1",
"default": "deny",
"tools": {
"cast_chain": {}
}
}cast_chain is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get information about the current chain. It is categorised as a Read tool in the Foundry MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Foundry MCP Server MCP server in PolicyLayer and add a rule for cast_chain: 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 Foundry MCP Server. Nothing to install.
cast_chain 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 cast_chain 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 cast_chain. 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.
cast_chain is provided by the Foundry MCP Server MCP server (praneshasp/foundry-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 16 Foundry MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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16 Foundry MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.