Return the current chain tip block height (latest mined block number) for mainnet, testnet, signet, or liquid.
AI agents call block_height to retrieve information from Mcp Mempool Space without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves blockchain information without executing code, modifying data, or triggering external operations. It is a simple query operation consistent with the 'Read' category. The severity is low because obtaining public blockchain height information poses no security risk to systems or financial assets.
From the tool's definition Tool returns the current chain tip block height, which is a read-only query of blockchain state with no modification, side effects, or ability to alter data. The description uses 'return' indicating a retrieval operation.
Attacks that exploit this kind of access
Return the current chain tip block height (latest mined block number) for mainnet, testnet, signet, or liquid. It is categorised as a Read tool in the Mcp Mempool Space MCP Server, which means it retrieves data without modifying state.
Register the Mcp Mempool Space MCP server in PolicyLayer and add a rule for block_height: 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 Mcp Mempool Space. Nothing to install.
block_height 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 block_height 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 block_height. 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.
block_height is provided by the Mcp Mempool Space MCP server (pipeworx-io/mcp-mempool-space). 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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