AI agents call list_schemes to retrieve information from Warrant without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns information about available argumentation schemes—a read-only operation with no side effects, data modification, code execution, or destructive capabilities. The low severity reflects minimal risk even if misused by an AI agent, as it merely enumerates predefined reasoning patterns without altering state or triggering external actions.
From the tool's definition Tool name is 'list_schemes' with description 'List all available Walton argumentation schemes.' The verb 'list' explicitly indicates data retrieval with no modification or execution.
Attacks that exploit this kind of access
List all available Walton argumentation schemes. It is categorised as a Read tool in the Warrant MCP Server, which means it retrieves data without modifying state.
Register the Warrant MCP server in PolicyLayer and add a rule for list_schemes: 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 Warrant. Nothing to install.
list_schemes 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 list_schemes 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 list_schemes. 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.
list_schemes is provided by the Warrant MCP server (jayden-chmod/warrant-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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