dynamic.tool.create · Dynamic MCP: Risk & Policy

WHAT IT DOES

What dynamic.tool.create does on Dynamic

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

WHY IT NEEDS A POLICY

Why dynamic.tool.create needs a policy

This is a Write operation because it creates and registers new resources (dynamic tools) that persist in the system. While the tool itself doesn't execute arbitrary code directly, it enables registration of tools that may later be executed.

From the tool's definition Tool name explicitly states 'create' and description says 'Create and register a new dynamic tool'. The tool allows runtime creation of new tools that can be registered into the system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

dynamic.tool.create Rate-limited

dynamic.tool.create 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": {
    "dynamic.tool.create": {
      "limits": [
        {
          "counter": "dynamic.tool.create_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 Dynamic, so you can run agents against it safely.

FAQ

Questions about dynamic.tool.create

What does the dynamic.tool.create tool do? +

Create and register a new dynamic tool. It is categorised as a Write tool in the Dynamic MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on dynamic.tool.create? +

Register the Dynamic MCP server in PolicyLayer and add a rule for dynamic.tool.create: 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 Dynamic. Nothing to install.

What risk level is dynamic.tool.create? +

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

Can I rate-limit dynamic.tool.create? +

Yes. Add a rate_limit block to the dynamic.tool.create 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 dynamic.tool.create completely? +

Set action: deny in the PolicyLayer policy for dynamic.tool.create. 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 dynamic.tool.create? +

dynamic.tool.create is provided by the Dynamic MCP server (mcpland/dynamic-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.