Get details of all teams in the league including roster management stats and managers
AI agents call get_teams to retrieve information from Yahoo Fantasy MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries existing team data from a Yahoo Fantasy Sports league without creating, modifying, deleting, or executing any operations. It has no side effects and presents minimal risk of misuse—at worst, an AI agent would retrieve information it is already authorized to access.
From the tool's definition Tool name 'get_teams' and description 'Get details of all teams in the league' indicate retrieval of league data with no modification. Server description explicitly states 'read-only access to Yahoo Fantasy Sports data'.
Attacks that exploit this kind of access
Get details of all teams in the league including roster management stats and managers. It is categorised as a Read tool in the Yahoo Fantasy MCP MCP Server, which means it retrieves data without modifying state.
Register the Yahoo Fantasy MCP server in PolicyLayer and add a rule for get_teams: 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 MCP. Nothing to install.
get_teams 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_teams 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_teams. 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_teams is provided by the Yahoo Fantasy MCP server (spilchen/yahoo_fantasy_mcp). 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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