pm_create_market · Basis MCP Server MCP: Risk & Policy

WHAT IT DOES

What pm_create_market does on Basis MCP Server

AI agents use pm_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 pm_create_market needs a policy

The tool creates and stores a new prediction market record, which is a reversible operation (markets can be deleted or modified post-creation). This is a Write operation. Severity is high because prediction markets can involve financial stakes and user funds, and a malicious actor could create markets designed to defraud or mislead participants.

From the tool's definition Tool name 'pm_create_market' and description 'Create a private prediction market with metadata' indicate the tool creates a new data structure (a prediction market) with associated metadata.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pm_create_market Rate-limited

pm_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": {
    "pm_create_market": {
      "limits": [
        {
          "counter": "pm_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 pm_create_market

What does the pm_create_market tool do? +

Create a private prediction market with metadata. 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 pm_create_market? +

Register the Basis MCP Server MCP server in PolicyLayer and add a rule for pm_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 pm_create_market? +

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

Can I rate-limit pm_create_market? +

Yes. Add a rate_limit block to the pm_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 pm_create_market completely? +

Set action: deny in the PolicyLayer policy for pm_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 pm_create_market? +

pm_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.