Get the chain ID for a given chain name
AI agents call get_chain_id to retrieve information from Etherscan MCP Tool without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries blockchain metadata (chain ID) and returns information without side effects. It does not create, modify, delete, execute arbitrary code, or move funds. The read-only nature combined with low sensitivity of chain ID data (publicly available network identifiers) results in low severity classification.
From the tool's definition Tool retrieves chain ID for a given chain name with no modification of state. Description indicates 'get' operation, a standard read-only query pattern.
Attacks that exploit this kind of access
Get the chain ID for a given chain name. It is categorised as a Read tool in the Etherscan MCP Tool MCP Server, which means it retrieves data without modifying state.
Register the Etherscan MCP Tool MCP server in PolicyLayer and add a rule for get_chain_id: 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 Etherscan MCP Tool. Nothing to install.
get_chain_id 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_chain_id 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_chain_id. 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_chain_id is provided by the Etherscan MCP Tool MCP server (septemhill/etherscan-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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