Parent-only. Sends a 'check-in' push notification (and email fallback) to a linked child. Use when the parent says things like 'remind my kid to study', 'nudge my child', 'tell Sam to do their words today'. The server enforces a 24h cooldown per child — if rate-limited the response includes retry...
Part of the Vocab Voyage server.
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AI agents call nudge_child to retrieve information from Vocab Voyage 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 nudge_child 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": {
"nudge_child": {}
}
}See the full Vocab Voyage policy for all 31 tools.
These attack patterns abuse exactly the kind of access nudge_child 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.
Parent-only. Sends a 'check-in' push notification (and email fallback) to a linked child. Use when the parent says things like 'remind my kid to study', 'nudge my child', 'tell Sam to do their words today'. The server enforces a 24h cooldown per child — if rate-limited the response includes retry_after_hours. NEVER spoof a different parent — the calling user must already be linked to the child. Requires sign-in.. It is categorised as a Read tool in the Vocab Voyage MCP Server, which means it retrieves data without modifying state.
Register the Vocab Voyage MCP server in PolicyLayer and add a rule for nudge_child: 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 Vocab Voyage. Nothing to install.
nudge_child 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 nudge_child 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 nudge_child. 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.
nudge_child is provided by the Vocab Voyage MCP server (https://gponcrussdahcdyrlhcr.supabase.co/functions/v1/mcp-server?ref=mcp_registry). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 31 Vocab Voyage tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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