Filter markets by category or tag (e.g., Politics, Sports, Crypto). Returns markets in the specified category.
AI agents call filter_markets_by_category to retrieve information from Polymarket MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or lists markets matching specified filter criteria. It performs a search/filter operation without creating, modifying, deleting, or executing any trades or financial transactions. The return of market data is a pure read operation. Despite the server's overall financial trading context, this specific tool is a harmless data lookup utility.
From the tool's definition Tool name 'filter_markets_by_category' and description 'Filter markets by category or tag... Returns markets in the specified category' indicate a query/retrieval operation with no side effects.
Attacks that exploit this kind of access
Filter markets by category or tag (e.g., Politics, Sports, Crypto). Returns markets in the specified category. It is categorised as a Read tool in the Polymarket MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Polymarket MCP Server MCP server in PolicyLayer and add a rule for filter_markets_by_category: 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 Polymarket MCP Server. Nothing to install.
filter_markets_by_category 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 filter_markets_by_category 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 filter_markets_by_category. 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.
filter_markets_by_category is provided by the Polymarket MCP Server MCP server (nancheng582-jpg/polymarket-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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