AI agents call get_epoch_info to retrieve information from Onchain without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple data retrieval operation querying blockchain state information. It has no side effects, does not modify data, does not execute code, and does not involve financial transactions. The blast radius of misuse is minimal—an attacker could only gain knowledge of current network state information, which is already public on-chain data. This is a straightforward read operation.
From the tool's definition Tool retrieves 'current Solana network epoch/slot info' including epoch, slot, block height, and progress. The description uses 'Get' which indicates a read-only retrieval operation.
Attacks that exploit this kind of access
Get current Solana network epoch/slot info (epoch, slot, block height, progress). It is categorised as a Read tool in the Onchain MCP Server, which means it retrieves data without modifying state.
Register the Onchain MCP server in PolicyLayer and add a rule for get_epoch_info: 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 Onchain. Nothing to install.
get_epoch_info 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_epoch_info 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_epoch_info. 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_epoch_info is provided by the Onchain MCP server (sylvainlondon136/onchain-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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