sync_transaction · Basis MCP Server MCP: Risk & Policy

WHAT IT DOES

What sync_transaction does on Basis MCP Server

AI agents use sync_transaction 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 sync_transaction needs a policy

This tool syncs transaction data to a backend system, which is a write/update operation (propagating state). It does not appear to initiate financial transfers itself, but rather records or reconciles an existing transaction. Confidence is moderate because 'sync' could range from a benign read-like operation to triggering state changes; given the financial context of the server, misuse could have downstream effects.

From the tool's definition Manually sync a transaction to the backend

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sync_transaction Rate-limited

sync_transaction 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": {
    "sync_transaction": {
      "limits": [
        {
          "counter": "sync_transaction_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 sync_transaction

What does the sync_transaction tool do? +

Manually sync a transaction to the backend. 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 sync_transaction? +

Register the Basis MCP Server MCP server in PolicyLayer and add a rule for sync_transaction: 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 sync_transaction? +

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

Can I rate-limit sync_transaction? +

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

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

sync_transaction 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.