List pending mempool transactions.
AI agents call stx_mempool_list_pending to retrieve information from Bitcoin wallet 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 information about pending mempool transactions. It performs a read-only query of blockchain state with no side effects—it does not send funds, modify data, execute code, or delete anything. The action is purely informational, making it a Read category tool. Given the blockchain context, the severity is low since listing mempool data poses minimal risk even if misused by an agent.
From the tool's definition Tool name 'stx_mempool_list_pending' with description 'List pending mempool transactions' indicates a query operation that retrieves and displays transaction data without modifying, deleting, or executing any actions.
Attacks that exploit this kind of access
List pending mempool transactions. It is categorised as a Read tool in the Bitcoin wallet MCP server MCP Server, which means it retrieves data without modifying state.
Register the Bitcoin wallet MCP server MCP server in PolicyLayer and add a rule for stx_mempool_list_pending: 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 Bitcoin wallet MCP server. Nothing to install.
stx_mempool_list_pending 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 stx_mempool_list_pending 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 stx_mempool_list_pending. 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.
stx_mempool_list_pending is provided by the Bitcoin wallet MCP server MCP server (markmhendrickson/mcp-server-bitcoin). 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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