vc_commit · Agent-VC MCP Server MCP: Risk & Policy

WHAT IT DOES

What vc_commit does on Agent-VC MCP Server

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

WHY IT NEEDS A POLICY

Why vc_commit needs a policy

This tool creates a new persistent record (commit) in version control, modifying the repository state. While commits are theoretically reversible through version control operations, committing changes is fundamentally a write action that alters repository history. It is not destructive (commits are not erased, just superseded), not financial, and not execution of arbitrary code.

From the tool's definition Tool description states "Commits current changes across the entire workspace to Fossil." The word 'commits' indicates it records and persists modifications to a version control system.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vc_commit Rate-limited

vc_commit 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": {
    "vc_commit": {
      "limits": [
        {
          "counter": "vc_commit_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 Agent-VC MCP Server, so you can run agents against it safely.

FAQ

Questions about vc_commit

What does the vc_commit tool do? +

Commits current changes across the entire workspace to Fossil. It is categorised as a Write tool in the Agent-VC 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 vc_commit? +

Register the Agent-VC MCP Server MCP server in PolicyLayer and add a rule for vc_commit: 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 Agent-VC MCP Server. Nothing to install.

What risk level is vc_commit? +

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

Can I rate-limit vc_commit? +

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

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

vc_commit is provided by the Agent-VC MCP Server MCP server (manbothq/agent-vc-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.