Renew an ENS name or batch of names. Returns the transaction data needed to extend registration. Unlike registration, renewal is simple — just one transaction with payment. No commit/reveal needed. Accepts ANY duration — days, weeks, months, years. There is no minimum renewal period on ENS. Examp...
Part of the Name Whisper server.
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AI agents call renew_ens_name to retrieve information from Name Whisper without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though renew_ens_name only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"renew_ens_name": {}
}
}See the full Name Whisper policy for all 34 tools.
These attack patterns abuse exactly the kind of access renew_ens_name gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Renew an ENS name or batch of names. Returns the transaction data needed to extend registration. Unlike registration, renewal is simple — just one transaction with payment. No commit/reveal needed. Accepts ANY duration — days, weeks, months, years. There is no minimum renewal period on ENS. Examples: 7 days (1 week), 28 days (1 month), 365 days (1 year). Anyone can renew any name (you don't need to be the owner). This is useful for: - Extending your own names before expiry - Gifting renewal to a friend's name - Protecting valuable names from expiring Returns exact on-chain pricing from the ETHRegistrarController with a 5% buffer (excess is refunded). For batch renewals (multiple names), all names are bundled into a SINGLE Multicall3 transaction.. It is categorised as a Read tool in the Name Whisper MCP Server, which means it retrieves data without modifying state.
Register the Name Whisper MCP server in PolicyLayer and add a rule for renew_ens_name: 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 Name Whisper. Nothing to install.
renew_ens_name 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 renew_ens_name 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 renew_ens_name. 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.
renew_ens_name is provided by the Name Whisper MCP server (namewhisper/ens-tools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 34 Name Whisper tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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