Check if an indexer URL is valid
AI agents call rgb_check_indexer_url to retrieve information from RGB Lightning Network MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only validation check of a network endpoint. It retrieves status information about an indexer URL to determine validity, similar to a ping or health check. No data is created, modified, deleted, or financial transactions are initiated. The blast radius of misuse is minimal—a malicious agent could only spam checks or discover valid indexer endpoints, neither of which causes significant harm.
From the tool's definition Tool name 'rgb_check_indexer_url' and description 'Check if an indexer URL is valid' indicate a validation/verification operation that queries or tests the availability/validity of a URL endpoint without modifying state or executing code.
Attacks that exploit this kind of access
Check if an indexer URL is valid. It is categorised as a Read tool in the RGB Lightning Network MCP Server MCP Server, which means it retrieves data without modifying state.
Register the RGB Lightning Network MCP Server MCP server in PolicyLayer and add a rule for rgb_check_indexer_url: 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 RGB Lightning Network MCP Server. Nothing to install.
rgb_check_indexer_url 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 rgb_check_indexer_url 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 rgb_check_indexer_url. 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.
rgb_check_indexer_url is provided by the RGB Lightning Network MCP Server MCP server (lnfi-network/rgb-mcp-server). 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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