Returns the average transaction size over a specified number of blocks
AI agents call get_avg_tx_size to retrieve information from MCP Blockchain Query Server 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 aggregated blockchain statistics (average transaction size). It performs read-only access to blockchain data without creating, modifying, deleting, or executing any operations. The data returned is computed from existing blockchain records and poses minimal security risk if misused by an agent.
From the tool's definition Tool name 'get_avg_tx_size' and description 'Returns the average transaction size over a specified number of blocks' indicate a data retrieval operation with no side effects.
Attacks that exploit this kind of access
Returns the average transaction size over a specified number of blocks. It is categorised as a Read tool in the MCP Blockchain Query Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Blockchain Query Server MCP server in PolicyLayer and add a rule for get_avg_tx_size: 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 Blockchain Query Server. Nothing to install.
get_avg_tx_size 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_avg_tx_size 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_avg_tx_size. 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_avg_tx_size is provided by the MCP Blockchain Query Server MCP server (pavel-bc/mcp-blockchain-query). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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