Rotate credentials for the range. Args: user_id: Optional user ID (admin only) Returns: Credential rotation result
AI agents use rotate_credentials to create or update resources in Ludus FastMCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ludus FastMCP environment.
Rotating credentials is a write operation that modifies authentication data. While it doesn't delete data, it does invalidate existing credentials and create new ones, which could lock out users or break running services if misused. The optional admin-only user_id parameter increases the blast radius, as an AI agent could rotate credentials for any user in the range environment.
From the tool's definition 'Rotate credentials for the range' - credential rotation modifies authentication secrets
Risk signalsAdmin/system-level operation
Documented attack patterns abuse exactly the kind of access rotate_credentials gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ludus FastMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for rotate_credentials:
{
"version": "1",
"default": "deny",
"tools": {
"rotate_credentials": {
"limits": [
{
"counter": "rotate_credentials_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}rotate_credentials 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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Rotate credentials for the range. Args: user_id: Optional user ID (admin only) Returns: Credential rotation result. It is categorised as a Write tool in the Ludus FastMCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Ludus Fast MCP server in PolicyLayer and add a rule for rotate_credentials: 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 Ludus FastMCP. Nothing to install.
rotate_credentials 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 rotate_credentials 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 rotate_credentials. 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.
rotate_credentials is provided by the Ludus Fast MCP server (tjnull/ludus-fastmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 201 Ludus FastMCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
201 Ludus FastMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.