create_reconnect_session · Nango MCP: Risk & Policy

WHAT IT DOES

What create_reconnect_session does on Nango

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

WHY IT NEEDS A POLICY

Why create_reconnect_session needs a policy

This tool creates a session artifact (a reconnect session) which is a reversible modification to system state. It does not execute arbitrary code, delete data, move money, or query/retrieve data as its primary function. The creation of a reconnect session is a standard write operation that can be undone by deleting the session.

From the tool's definition Tool name 'create_reconnect_session' and description 'Create a Nango reconnect session for an existing connection' indicate creation of a new session object that modifies state within the Nango system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_reconnect_session Rate-limited

create_reconnect_session 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_reconnect_session": {
      "limits": [
        {
          "counter": "create_reconnect_session_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about create_reconnect_session

What does the create_reconnect_session tool do? +

Create a Nango reconnect session for an existing connection. It is categorised as a Write tool in the Nango 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_reconnect_session? +

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

What risk level is create_reconnect_session? +

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

Can I rate-limit create_reconnect_session? +

Yes. Add a rate_limit block to the create_reconnect_session 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_reconnect_session completely? +

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

create_reconnect_session is provided by the Nango MCP server (levsky22/nango-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.