copilot-session-start

THE RISK

Medium Risk

Why copilot-session-start needs a policy

This tool creates a new session/conversation object, which is a reversible write operation (state creation). It does not execute code, delete data, or involve financial transactions. The blast radius is low since it only initializes a session context.

From the tool's definition Start a new Copilot conversation session

Documented attack patterns abuse exactly the kind of access copilot-session-start gives an agent:

POLICY

How to control copilot-session-start

PolicyLayer is an MCP gateway — it sits between your AI agents and GitHub Copilot MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for copilot-session-start:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "copilot-session-start": {
      "limits": [
        {
          "counter": "copilot-session-start_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

copilot-session-start 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.

Create a free account and register GitHub Copilot MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More GitHub Copilot MCP Server tools

Read ask-copilot Ask GitHub Copilot CLI to help with coding tasks, generate commands, explain code, or prov Read copilot-debug Help debug code errors and issues Read copilot-explain Get detailed explanations of code or technical concepts Read copilot-refactor Suggest refactoring improvements for code Read copilot-review Get a code review with suggestions Read copilot-session-history Retrieve the conversation history for the current session Read copilot-suggest Get CLI command suggestions for specific tasks Read copilot-test-generate Generate unit tests for code

All 9 GitHub Copilot MCP Server tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about copilot-session-start

What does the copilot-session-start tool do? +

Start a new Copilot conversation session. It is categorised as a Write tool in the GitHub Copilot 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 copilot-session-start? +

Register the GitHub Copilot MCP Server MCP server in PolicyLayer and add a rule for copilot-session-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 GitHub Copilot MCP Server. Nothing to install.

What risk level is copilot-session-start? +

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

Can I rate-limit copilot-session-start? +

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

Set action: deny in the PolicyLayer policy for copilot-session-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 copilot-session-start? +

copilot-session-start is provided by the GitHub Copilot MCP Server MCP server (poorgramer-zack/copilot-mcp-tool). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every GitHub Copilot MCP Server tool call.

Start from GitHub Copilot MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →