save_session

THE RISK

Medium Risk

Why save_session needs a policy

This tool writes/persists data (the Pro Tools session) to storage. While reversible (previous versions may exist), it commits the current state and could overwrite unsaved work context. Classified as Write rather than Destructive because the operation is typically reversible through undo/version history.

From the tool's definition Tool name 'save_session' and description 'Save the current Pro Tools session' indicate a write operation that modifies stored session state. The session file is updated/persisted with current changes.

Documented attack patterns abuse exactly the kind of access save_session gives an agent:

POLICY

How to control save_session

PolicyLayer is an MCP gateway — it sits between your AI agents and Pro Tools MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for save_session:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "save_session": {
      "limits": [
        {
          "counter": "save_session_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

save_session 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 Pro Tools 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 Pro Tools MCP Server tools

Destructive clear Clear (delete) the selected content on selected tracks within the timeline selection witho Destructive delete_all_markers Delete all markers/memory locations in the session Destructive delete_marker Delete one or more markers by their numbers Destructive cut Cut the selected content on selected tracks within the timeline selection. Use select_trac Execute play Start playback in Pro Tools Execute ptsl_command Execute a raw PTSL command with custom parameters. Use this for advanced operations not co Execute record Start recording in Pro Tools Execute stop Stop playback/recording in Pro Tools

All 36 Pro Tools MCP Server tools →

Write tools on other servers

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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 save_session

What does the save_session tool do? +

Save the current Pro Tools session. It is categorised as a Write tool in the Pro Tools 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 save_session? +

Register the Pro Tools MCP Server MCP server in PolicyLayer and add a rule for save_session: 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 Pro Tools MCP Server. Nothing to install.

What risk level is save_session? +

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

Can I rate-limit save_session? +

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

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

save_session is provided by the Pro Tools MCP Server MCP server (skrul/protools-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Pro Tools MCP Server tool call.

Start from Pro Tools 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 →