create_market · Basis MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_market does on Basis MCP Server

AI agents use create_market to create or update resources in Basis MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Basis MCP Server environment.

WHY IT NEEDS A POLICY

Why create_market needs a policy

This tool creates a new prediction market, which is a write operation that modifies protocol state by introducing a new asset. While creation is reversible (unlike deletion), it commits the user to an ongoing relationship (earning 20% of trading fees), carries financial implications through fee collection, and could enable market manipulation if misused by an agent.

From the tool's definition Tool description states 'Create prediction market' and involves providing image assets (image_url OR image_file_path).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_market Rate-limited

create_market stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_market": {
      "limits": [
        {
          "counter": "create_market_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Basis MCP Server, so you can run agents against it safely.

FAQ

Questions about create_market

What does the create_market tool do? +

Create prediction market. Earn 20% of net trading fees forever. Provide image_url OR image_file_path. It is categorised as a Write tool in the Basis MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_market? +

Register the Basis MCP Server MCP server in PolicyLayer and add a rule for create_market: 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 Basis MCP Server. Nothing to install.

What risk level is create_market? +

create_market is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create_market? +

Yes. Add a rate_limit block to the create_market 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.

How do I block create_market completely? +

Set action: deny in the PolicyLayer policy for create_market. 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.

What MCP server provides create_market? +

create_market is provided by the Basis MCP Server MCP server (launch-on-basis/mcp-ts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.