Manage end-user auth records for an app. Actions: - "list": Paginated list of app_users (id, email, provider, provider_uid, email_verified, last_sign_in_at, created_at). Pass the next_cursor from a prior response to page. - "delete": Hard-delete an app user by id. Cascades to refresh tokens and v...
Part of the Mcp server.
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AI agents use manage_auth_users to create or modify resources in Mcp. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call manage_auth_users repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Mcp.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"manage_auth_users": {
"limits": [
{
"counter": "manage_auth_users_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Mcp policy for all 47 tools.
These attack patterns abuse exactly the kind of access manage_auth_users gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Manage end-user auth records for an app. Actions: - "list": Paginated list of app_users (id, email, provider, provider_uid, email_verified, last_sign_in_at, created_at). Pass the next_cursor from a prior response to page. - "delete": Hard-delete an app user by id. Cascades to refresh tokens and verification codes. Use this to unblock OAuth migrations when an existing email/password row collides. Parameters by action: list: { app_id, action: "list", limit?, cursor? } delete: { app_id, action: "delete", user_id } Tips: - Looking for a user by email? Call list and filter client-side; this tool does not search by email. - To switch a user from email/password to Google OAuth without deleting, just have them sign in with Google — the OAuth callback now links the existing email row in place automatically.. It is categorised as a Write tool in the Mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the MCP server in PolicyLayer and add a rule for manage_auth_users: 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. Nothing to install.
manage_auth_users 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 manage_auth_users 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 manage_auth_users. 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.
manage_auth_users is provided by the MCP server (@butterbase/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 47 Mcp tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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