Get a league's teams, settings, and current standings. Defaults to the configured league when leagueKey is omitted.
AI agents call get_league to retrieve information from Yahoo Fantasy Baseball without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
leagueKey | string | — | League key, e.g. 431.l.12345 |
Parameters from the server's own tool schema.
This is a retrieval operation that queries and returns data (teams, settings, standings) without creating, modifying, deleting, or executing any operations. It is purely informational and has no side effects on the fantasy baseball league state.
From the tool's definition Tool name is 'get_league' and description states it retrieves 'a league's teams, settings, and current standings' with no mention of modifications or side effects.
Attacks that exploit this kind of access
Get a league's teams, settings, and current standings. Defaults to the configured league when leagueKey is omitted. It is categorised as a Read tool in the Yahoo Fantasy Baseball MCP Server, which means it retrieves data without modifying state.
get_league accepts 1 parameter: leagueKey. The full parameter table on this page comes from the server's own tool schema.
Register the Yahoo Fantasy Baseball MCP server in PolicyLayer and add a rule for get_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 Yahoo Fantasy Baseball. Nothing to install.
get_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 get_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 get_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.
get_league is provided by the Yahoo Fantasy Baseball MCP server (yahoo-fantasy-baseball-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
get_league is one line of Yahoo Fantasy Baseball's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →