register_underlying · Tradeblocks MCP: Risk & Policy

WHAT IT DOES

What register_underlying does on Tradeblocks

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

WHY IT NEEDS A POLICY

Why register_underlying needs a policy

An AI agent can call register_underlying faster than any human can review — one bad instruction and it creates or modifies resources in Tradeblocks by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

register_underlying Rate-limited

register_underlying 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": {
    "register_underlying": {
      "limits": [
        {
          "counter": "register_underlying_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 Tradeblocks, so you can run agents against it safely.

FAQ

Questions about register_underlying

What does the register_underlying tool do? +

Add or update an underlying\u2192roots mapping in the ticker registry. Persists to {dataRoot}/market/underlyings.json (user override layer; bundled defaults are never modified). It is categorised as a Write tool in the Tradeblocks MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on register_underlying? +

Register the Tradeblocks MCP server in PolicyLayer and add a rule for register_underlying: 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 Tradeblocks. Nothing to install.

What risk level is register_underlying? +

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

Can I rate-limit register_underlying? +

Yes. Add a rate_limit block to the register_underlying 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 register_underlying completely? +

Set action: deny in the PolicyLayer policy for register_underlying. 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 register_underlying? +

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