Get proposed trades that include the team (both offered and received)
AI agents call get_team_proposed_trades 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 proposed trade data without modifying, executing, or deleting anything. It is a passive read operation consistent with the read-only nature of the server. Severity is low because viewing proposed trades poses minimal risk - the actual trade execution would be a separate operation and this only returns information about pending proposals.
From the tool's definition Tool is named 'get_team_proposed_trades' with description 'Get proposed trades that include the team' - uses 'Get' verb indicating retrieval. Server description explicitly states 'read-only access' to Yahoo Fantasy Sports data.
Attacks that exploit this kind of access
Get proposed trades that include the team (both offered and received). 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_team_proposed_trades: 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_team_proposed_trades 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_team_proposed_trades 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_team_proposed_trades. 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_team_proposed_trades 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.
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