begin_transaction · KevoDB MCP Server MCP: Risk & Policy

WHAT IT DOES

What begin_transaction does on KevoDB MCP Server

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

WHY IT NEEDS A POLICY

Why begin_transaction needs a policy

This tool initiates a transaction context in the database, which is a setup/state-creation operation. It creates a new transaction object server-side but does not itself read, modify, or delete data. The closest category is Write since it creates a new resource (transaction ID/session).

From the tool's definition Begin a new transaction and return transaction ID

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

begin_transaction Rate-limited

begin_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": {
    "begin_transaction": {
      "limits": [
        {
          "counter": "begin_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 KevoDB MCP Server, so you can run agents against it safely.

FAQ

Questions about begin_transaction

What does the begin_transaction tool do? +

Begin a new transaction and return transaction ID. It is categorised as a Write tool in the KevoDB 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 begin_transaction? +

Register the KevoDB MCP Server MCP server in PolicyLayer and add a rule for begin_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 KevoDB MCP Server. Nothing to install.

What risk level is begin_transaction? +

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

Can I rate-limit begin_transaction? +

Yes. Add a rate_limit block to the begin_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 begin_transaction completely? +

Set action: deny in the PolicyLayer policy for begin_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 begin_transaction? +

begin_transaction is provided by the KevoDB MCP Server MCP server (kevodb/kevo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.