delete_session

THE RISK

Critical Risk

Why delete_session needs a policy

This tool irreversibly removes session data, which cannot be undone. While the blast radius is localized to session history rather than permanent data loss, the destructive nature of the operation and potential loss of calculation history warrants the Destructive category.

From the tool's definition Tool name 'delete_session' and description 'Delete session' indicate irreversible removal of session data. The action 'delete' is explicitly destructive.

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

POLICY

How to control delete_session

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

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "delete_session"
  ]
}

delete_session disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More MCP Mathematics tools

Destructive clear_history Clear history Execute batch_calculate Batch calculate expressions Execute calculate_expression Evaluate math expression Execute matrix_operation matrix_operation Execute optimize_memory Optimize memory Execute session_calculate Session calculation Execute convert_natural_language Natural language conversion Write create_session Create session

All 18 MCP Mathematics tools →

Destructive tools on other servers

Android Forensics ADB MCP Server create_full_backup 0xarchive web3_revoke_key Frida Game Hacking MCP clear_scan cPanel MCP Server clear_spam_box

Go deeper

Critical-risk tools in MCP Mathematics → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about delete_session

What does the delete_session tool do? +

Delete session. It is categorised as a Destructive tool in the MCP Mathematics MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on delete_session? +

Register the MCP Mathematics MCP server in PolicyLayer and add a rule for delete_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 Mathematics. Nothing to install.

What risk level is delete_session? +

delete_session is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit delete_session? +

Yes. Add a rate_limit block to the delete_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 delete_session completely? +

Set action: deny in the PolicyLayer policy for delete_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 delete_session? +

delete_session is provided by the MCP Mathematics MCP server (shsharkar/mcp-mathematics). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Mathematics tool call.

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

CHECK YOUR STACK →