bump · Dbrain MCP: Risk & Policy

WHAT IT DOES

What bump does on Dbrain

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

WHY IT NEEDS A POLICY

Why bump needs a policy

The tool modifies an existing memory entry (likely updating a last-accessed timestamp or preventing expiry), which is a reversible, low-impact write operation. It does not delete, execute code, or involve financial transactions.

From the tool's definition 'Touch a memory to keep it alive. Call this when you use a fact to answer a question.' — updates/refreshes a memory record's timestamp or activity marker.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bump Rate-limited

bump 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": {
    "bump": {
      "limits": [
        {
          "counter": "bump_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 Dbrain, so you can run agents against it safely.

FAQ

Questions about bump

What does the bump tool do? +

Touch a memory to keep it alive. Call this when you use a fact to answer a question. It is categorised as a Write tool in the Dbrain MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on bump? +

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

What risk level is bump? +

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

Can I rate-limit bump? +

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

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

bump is provided by the Dbrain MCP server (ivncmp/dbrain). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.