Initialize a new penetration testing session.
AI agents use initialize_session to create or update resources in CHAI pentest tool — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your CHAI pentest tool environment.
This tool creates a new session object (Write), establishing the context for a penetration testing engagement. While it sets up infrastructure for potentially dangerous subsequent actions, initialization itself is reversible and does not yet execute attacks or modify external systems.
From the tool's definition Initialize a new penetration testing session
Documented attack patterns abuse exactly the kind of access initialize_session gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CHAI pentest tool, and nothing reaches the server without passing your rules. This is the rule we recommend for initialize_session:
{
"version": "1",
"default": "deny",
"tools": {
"initialize_session": {
"limits": [
{
"counter": "initialize_session_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}initialize_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.
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Initialize a new penetration testing session. It is categorised as a Write tool in the CHAI pentest tool MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the CHAI pentest tool MCP server in PolicyLayer and add a rule for initialize_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 CHAI pentest tool. Nothing to install.
initialize_session is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the initialize_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.
Set action: deny in the PolicyLayer policy for initialize_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.
initialize_session is provided by the CHAI pentest tool MCP server (nihar-sarkar/chai). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from CHAI pentest tool, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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16 CHAI pentest tool tools catalogued and risk-classified — across an index of 43,000+ MCP servers.