rvf_build · Claude Flow MCP: Risk & Policy

WHAT IT DOES

What rvf_build does on Claude Flow

AI agents invoke rvf_build to trigger actions in Claude Flow. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why rvf_build needs a policy

The tool triggers compilation/assembly of a containerized application. This is an Execute-class action because it runs external build operations with side effects (generating artifacts, potentially pulling dependencies, executing build scripts) whose outcomes depend on input parameters.

From the tool's definition Tool name 'rvf_build' and description 'Build RVF container' indicate execution of a containerization process.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

rvf_build Rate-limited

rvf_build stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "rvf_build": {
      "limits": [
        {
          "counter": "rvf_build_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about rvf_build

What does the rvf_build tool do? +

Build RVF container. It is categorised as a Execute tool in the Claude Flow MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on rvf_build? +

Register the Claude Flow MCP server in PolicyLayer and add a rule for rvf_build: 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 Claude Flow. Nothing to install.

What risk level is rvf_build? +

rvf_build is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit rvf_build? +

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

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

rvf_build is provided by the Claude Flow MCP server (claude-flow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.