Rank league players (including free agents) by a sort key. sort is a stat id or one of AR (actual rank), OR (overall rank), PTS. sortType scopes the ranking window. Use this to find waiver/free-agent targets. Returns up to 25 players per call; page with start.
AI agents call rank_players 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 |
|---|---|---|---|
sort | string | — | Stat id, or AR / OR / PTS |
count | integer | — | Number of players to return (max 25) |
start | integer | — | Pagination offset |
sortType | string | — | Ranking window |
leagueKey | string | — | League key; defaults to configured league |
Parameters from the server's own tool schema.
This tool retrieves and ranks player data without modifying any state. It queries rankings and statistics for informational purposes only, making it a pure Read operation with minimal risk.
From the tool's definition Rank league players (including free agents) by a sort key... Use this to find waiver/free-agent targets. Returns up to 25 players per call; page with `start`.
Attacks that exploit this kind of access
Rank league players (including free agents) by a sort key. sort is a stat id or one of AR (actual rank), OR (overall rank), PTS. sortType scopes the ranking window. Use this to find waiver/free-agent targets. Returns up to 25 players per call; page with start. It is categorised as a Read tool in the Yahoo Fantasy Baseball MCP Server, which means it retrieves data without modifying state.
rank_players accepts 5 parameters: sort, count, start, sortType, 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 rank_players: 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.
rank_players 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 rank_players 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 rank_players. 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.
rank_players 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.
rank_players 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 →