create_session

THE RISK

Medium Risk

Why create_session needs a policy

This tool creates a session object for tracking purposes, which is a reversible data creation operation. It does not execute hash cracking directly (that would be Execute via sibling tools like 'crack_hash'), nor does it delete or modify hashes irreversibly. Creating a session is a typical Write-category operation.

From the tool's definition Tool name 'create_session' and description 'Create a new hashcat session for tracking' indicate creating a new configuration or state record for hashcat operations.

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

POLICY

How to control create_session

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

policy.json

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

create_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 Hashcat 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 Hashcat MCP Server tools

Execute auto_attack_strategy Automatically choose and execute best attack strategy Execute benchmark_hashcat Run hashcat benchmark for specified hash types or all types Execute crack_hash Crack a hash using hashcat with various attack modes Execute crack_multiple_hashes Crack multiple hashes efficiently with auto-detection Execute create_wordlist_rules Generate wordlist variations using hashcat rules Execute generate_mask_attack Generate mask attack patterns for brute force Execute generate_smart_masks Generate intelligent mask patterns based on common password patterns Write save_attack_preset Save attack configuration as preset

All 23 Hashcat 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 create_session

What does the create_session tool do? +

Create a new hashcat session for tracking. It is categorised as a Write tool in the Hashcat 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 create_session? +

Register the Hashcat MCP Server MCP server in PolicyLayer and add a rule for create_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 Hashcat MCP Server. Nothing to install.

What risk level is create_session? +

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

Can I rate-limit create_session? +

Yes. Add a rate_limit block to the create_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 create_session completely? +

Set action: deny in the PolicyLayer policy for create_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 create_session? +

create_session is provided by the Hashcat MCP Server MCP server (mordavid/hashcat-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Hashcat MCP Server tool call.

Start from Hashcat 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 →