follow_market · Manifold MCP: Risk & Policy

WHAT IT DOES

What follow_market does on Manifold

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

WHY IT NEEDS A POLICY

Why follow_market needs a policy

This tool modifies user preferences by adding or removing a market from their followed list. This is a Write operation because it creates or modifies data (the user's follow status) without irreversible consequences. The action is fully reversible (can be unfollowed), has no financial impact, and does not execute arbitrary code or delete data.

From the tool's definition Tool name 'follow_market' with description 'Follow or unfollow a market' indicates a state change operation that creates or modifies a user's market subscription/preference, which is reversible.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

follow_market Rate-limited

follow_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": {
    "follow_market": {
      "limits": [
        {
          "counter": "follow_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 Manifold, so you can run agents against it safely.

FAQ

Questions about follow_market

What does the follow_market tool do? +

Follow or unfollow a market. It is categorised as a Write tool in the Manifold MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on follow_market? +

Register the Manifold MCP server in PolicyLayer and add a rule for follow_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 Manifold. Nothing to install.

What risk level is follow_market? +

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

Can I rate-limit follow_market? +

Yes. Add a rate_limit block to the follow_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 follow_market completely? +

Set action: deny in the PolicyLayer policy for follow_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 follow_market? +

follow_market is provided by the Manifold MCP server (manifold-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.