Extend the expiry of an ENS subname in the NameWrapper. Subnames have their own expiry that cannot exceed the parent name's expiry. This tool extends a subname's expiry. Who can call this: - The parent name owner (always) - The subname owner (only if CAN_EXTEND_EXPIRY fuse is burned on the subnam...
Part of the Name Whisper — ENS Intelligence Layer server.
Free to start. No card required.
AI agents use extend_subname_expiry to create or modify resources in Name Whisper — ENS Intelligence Layer. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call extend_subname_expiry repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Name Whisper — ENS Intelligence Layer.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"extend_subname_expiry": {
"limits": [
{
"counter": "extend_subname_expiry_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Name Whisper — ENS Intelligence Layer policy for all 42 tools.
These attack patterns abuse exactly the kind of access extend_subname_expiry gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Extend the expiry of an ENS subname in the NameWrapper. Subnames have their own expiry that cannot exceed the parent name's expiry. This tool extends a subname's expiry. Who can call this: - The parent name owner (always) - The subname owner (only if CAN_EXTEND_EXPIRY fuse is burned on the subname) Use cases: - Extending subnames you've issued to users - Self-extending your own subname (if CAN_EXTEND_EXPIRY is set) - Keeping organizational subnames active. It is categorised as a Write tool in the Name Whisper — ENS Intelligence Layer MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Name Whisper — ENS Intelligence Layer MCP server in PolicyLayer and add a rule for extend_subname_expiry: 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 — ENS Intelligence Layer. Nothing to install.
extend_subname_expiry is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the extend_subname_expiry 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 extend_subname_expiry. 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.
extend_subname_expiry is provided by the Name Whisper — ENS Intelligence Layer MCP server (https://namewhisper.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 42 Name Whisper — ENS Intelligence Layer tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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