AI agents call sleeper_league to retrieve information from UnClick without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
league_id | string | Yes |
Parameters from the server's own tool schema.
This tool retrieves existing fantasy league data by ID. It does not modify, delete, or execute any operations—it only reads and returns information. The low severity reflects that unauthorized access would expose league data but pose minimal risk of broader system compromise or financial loss.
From the tool's definition Tool name 'sleeper_league' and description 'Get a Sleeper fantasy league by ID' indicate a retrieval operation with the verb 'Get', which performs a query without side effects.
Attacks that exploit this kind of access
Get a Sleeper fantasy league by ID. It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.
sleeper_league accepts 1 parameter: league_id. Required: league_id. The full parameter table on this page comes from the server's own tool schema.
Register the UnClick MCP server in PolicyLayer and add a rule for sleeper_league: 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 UnClick. Nothing to install.
sleeper_league 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 sleeper_league 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 sleeper_league. 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.
sleeper_league is provided by the UnClick MCP server (@unclick/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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