start · Session Buddy MCP: Risk & Policy

WHAT IT DOES

What start does on Session Buddy

AI agents invoke start to trigger actions in Session Buddy. 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 start needs a policy

Starting/initializing a session with dependencies and automation tools is an Execute action—it triggers operations that configure external systems and bootstrap environments. While not destructive, it can enable subsequent code execution and side effects.

From the tool's definition Tool description states it 'Initialize Claude session with comprehensive setup including UV dependencies and automation tools.' The verb 'Initialize' combined with 'setup' and 'dependencies' indicates the tool triggers external operations and configurations…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

start Rate-limited

start 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": {
    "start": {
      "limits": [
        {
          "counter": "start_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 Session Buddy, so you can run agents against it safely.

FAQ

Questions about start

What does the start tool do? +

Initialize Claude session with comprehensive setup including UV dependencies and automation tools. It is categorised as a Execute tool in the Session Buddy MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on start? +

Register the Session Buddy MCP server in PolicyLayer and add a rule for start: 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 Session Buddy. Nothing to install.

What risk level is start? +

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

Can I rate-limit start? +

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

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

start is provided by the Session Buddy MCP server (lesleslie/session-buddy). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.