Returns the value from a storage position at a given address
AI agents call eth_getStorageAt to retrieve information from EVM 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 smart contract storage data from a specific address and position. It is a query operation that does not modify, delete, execute, or transfer any data or assets. While the EVM MCP server provides comprehensive blockchain access including some sensitive operations, this particular tool is limited to reading immutable ledger state.
From the tool's definition Tool name is "eth_getStorageAt" and description states it "Returns the value from a storage position at a given address". The verb "returns" and the read-only nature of querying storage data indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
Returns the value from a storage position at a given address. It is categorised as a Read tool in the EVM MCP Server MCP Server, which means it retrieves data without modifying state.
Register the EVM MCP Server MCP server in PolicyLayer and add a rule for eth_getStorageAt: 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 EVM MCP Server. Nothing to install.
eth_getStorageAt 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 eth_getStorageAt 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 eth_getStorageAt. 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.
eth_getStorageAt is provided by the EVM MCP Server MCP server (jamesanz/evm-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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