AI agents invoke basic_auth to trigger actions in CyberMCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
The description is empty, lowering confidence. However, the server context is security vulnerability testing and sibling tools suggest this tool likely performs or tests Basic HTTP authentication, potentially sending credentials to external APIs. Given the security-testing nature of the server and sibling tools like 'auth_bypass_check', this tool likely executes authentication attempts against external endpoints.
From the tool's definition Tool name 'basic_auth' on a server explicitly designed for 'testing backend APIs for security vulnerabilities like authentication bypass' alongside sibling tools like 'auth_bypass_check' and 'oauth2_auth'
Documented attack patterns abuse exactly the kind of access basic_auth gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CyberMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for basic_auth:
{
"version": "1",
"default": "deny",
"tools": {
"basic_auth": {
"limits": [
{
"counter": "basic_auth_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}basic_auth stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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basic_auth. It is categorised as a Execute tool in the CyberMCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Cyber MCP server in PolicyLayer and add a rule for basic_auth: 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 CyberMCP. Nothing to install.
basic_auth is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the basic_auth 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 basic_auth. 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.
basic_auth is provided by the Cyber MCP server (ricauts/cybermcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from CyberMCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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14 CyberMCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.