AI agents use auth_refresh to create or update resources in PocketBase MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your PocketBase MCP Server environment.
This tool performs a state modification by issuing a new authentication token, which is characteristic of a Write operation. While it interacts with authentication systems, it doesn't execute arbitrary code (Execute), delete data (Destructive), move money (Financial), or merely read data (Read).
From the tool's definition Tool named 'auth_refresh' with description 'Refresh authentication token'. Refreshing a token modifies authentication state by issuing a new credential, which is a reversible write operation.
Documented attack patterns abuse exactly the kind of access auth_refresh gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and PocketBase MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for auth_refresh:
{
"version": "1",
"default": "deny",
"tools": {
"auth_refresh": {
"limits": [
{
"counter": "auth_refresh_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}auth_refresh 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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Refresh authentication token. It is categorised as a Write tool in the PocketBase MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the PocketBase MCP Server MCP server in PolicyLayer and add a rule for auth_refresh: 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 PocketBase MCP Server. Nothing to install.
auth_refresh 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 auth_refresh 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 auth_refresh. 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.
auth_refresh is provided by the PocketBase MCP Server MCP server (mrwyndham/pocketbase-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from PocketBase MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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24 PocketBase MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.