save_session · MCP Session Saver MCP: Risk & Policy

WHAT IT DOES

What save_session does on MCP Session Saver

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

WHY IT NEEDS A POLICY

Why save_session needs a policy

The save_session tool creates or modifies conversation records in Markdown file format. This is a reversible Write operation—the data can be modified or deleted later (as evidenced by the delete_session sibling tool). The severity is medium because misuse could lead to storage of sensitive conversation data or filling storage with unwanted records, but the effect is not irreversible or catastrophic.

From the tool's definition Tool name is 'save_session' and server description states it 'enables users to save... AI conversation records as organized Markdown files.' The sibling tools include delete_session, list_sessions, read_session, and search_sessions, confirming this tool…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

save_session Rate-limited

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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "save_session": {
      "limits": [
        {
          "counter": "save_session_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 MCP Session Saver, so you can run agents against it safely.

FAQ

Questions about save_session

What does the save_session tool do? +

【保存会话】当用户说. It is categorised as a Write tool in the MCP Session Saver 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 MCP Session Saver 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 MCP Session Saver. 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 MCP Session Saver MCP server (oscar-wang-xin/mcp-session-saver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.