batch_write · KevoDB MCP Server MCP: Risk & Policy

WHAT IT DOES

What batch_write does on KevoDB MCP Server

AI agents use batch_write 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 batch_write needs a policy

Batch write operations create or modify data in the database reversibly (can be rolled back within a transaction). While the description is empty, the name and server context clearly indicate this writes multiple records. This is categorized as Write rather than Execute because it performs standard data modification operations on a known database system rather than arbitrary code execution.

From the tool's definition Tool name is 'batch_write' which performs write operations on a key-value database. The server description mentions 'batch operations' as a core capability.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

batch_write Rate-limited

batch_write 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": {
    "batch_write": {
      "limits": [
        {
          "counter": "batch_write_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 batch_write

What does the batch_write tool do? +

batch_write. 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 batch_write? +

Register the KevoDB MCP Server MCP server in PolicyLayer and add a rule for batch_write: 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 batch_write? +

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

Can I rate-limit batch_write? +

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

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

batch_write 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.