List reminders. active_only filters out fired/cancelled. time_range = [start_iso, end_iso] on next_fire_at.
AI agents call list_reminders to retrieve information from Nexus Core without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a query operation to retrieve reminder data without modifying, executing, or deleting anything. The parameters (active_only filter, time_range for filtering) are used to refine the results of the query, not to perform side effects.
From the tool's definition Tool name is 'list_reminders' and description states 'List reminders' with filtering options (active_only, time_range). The verb 'list' and the read-only nature of querying reminders with no modification capability indicates a retrieval operation.
Attacks that exploit this kind of access
List reminders. active_only filters out fired/cancelled. time_range = [start_iso, end_iso] on next_fire_at. It is categorised as a Read tool in the Nexus Core MCP Server, which means it retrieves data without modifying state.
Register the Nexus Core MCP server in PolicyLayer and add a rule for list_reminders: 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 Nexus Core. Nothing to install.
list_reminders 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 list_reminders 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 list_reminders. 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.
list_reminders is provided by the Nexus Core MCP server (noumenon-ai/nexus-core). 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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