Read-only list of owner XRC-137 rules with no observed tx_receipts engine_rule_contract usage.
AI agents call get_unused_xrc137_rules to retrieve information from XGR MCP Gateway without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple data retrieval/query operation to list unused rules. It has no side effects, does not execute code or transactions, does not modify any state, and does not involve financial operations. The read-only nature and informational purpose classify it as a Read operation with low severity since misuse would only result in information disclosure without operational impact.
From the tool's definition Tool name and description explicitly state 'Read-only list' and retrieves data about 'owner XRC-137 rules' and their usage patterns with no capability to modify, execute, or delete data.
Attacks that exploit this kind of access
Read-only list of owner XRC-137 rules with no observed tx_receipts engine_rule_contract usage. It is categorised as a Read tool in the XGR MCP Gateway MCP Server, which means it retrieves data without modifying state.
Register the XGR MCP Gateway MCP server in PolicyLayer and add a rule for get_unused_xrc137_rules: 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 XGR MCP Gateway. Nothing to install.
get_unused_xrc137_rules 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_unused_xrc137_rules 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_unused_xrc137_rules. 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_unused_xrc137_rules is provided by the XGR MCP Gateway MCP server (xgr-network/xgr-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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