List messages for the chat, most recent first
AI agents call listMessages to retrieve information from Intervals Icu Api without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
id | number | Yes | |
limit | number | — | Return up to this many messages (default 30, max 100) |
beforeId | number | — | Only return messages older than this one |
Parameters from the server's own tool schema.
This tool queries and returns existing message data without creating, modifying, or deleting any information. It is a straightforward read operation that returns chat history in reverse chronological order. The blast radius of misuse is minimal—an agent could retrieve messages it shouldn't access, but cannot alter or destroy data through this tool alone.
From the tool's definition Tool name 'listMessages' and description 'List messages for the chat, most recent first' indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
List messages for the chat, most recent first. It is categorised as a Read tool in the Intervals Icu Api MCP Server, which means it retrieves data without modifying state.
listMessages accepts 3 parameters: id, limit, beforeId. Required: id. The full parameter table on this page comes from the server's own tool schema.
Register the Intervals Icu Api MCP server in PolicyLayer and add a rule for listMessages: 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 Intervals Icu Api. Nothing to install.
listMessages 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 listMessages 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 listMessages. 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.
listMessages is provided by the Intervals Icu Api MCP server (intervals-icu-api-mcp-server). 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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