Check if the user has completed browser sign-in for a device auth request. Poll this after calling initiate_device_auth. Returns status 'pending' while waiting, or 'complete' with an api_key when the user has signed in. Use the returned api_key as the authorization parameter in other tools. Args:...
Part of the Hypathesis server.
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AI agents call check_device_auth to retrieve information from Hypathesis without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though check_device_auth only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"check_device_auth": {}
}
}See the full Hypathesis policy for all 4 tools.
These attack patterns abuse exactly the kind of access check_device_auth gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Check if the user has completed browser sign-in for a device auth request. Poll this after calling initiate_device_auth. Returns status 'pending' while waiting, or 'complete' with an api_key when the user has signed in. Use the returned api_key as the authorization parameter in other tools. Args: user_code: The user_code returned by initiate_device_auth. Returns: Pending: {"status": "pending"} Complete: {"status": "complete", "api_key": "hk_..."} Error: {"error": "..."}. It is categorised as a Read tool in the Hypathesis MCP Server, which means it retrieves data without modifying state.
Register the Hypathesis MCP server in PolicyLayer and add a rule for check_device_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 Hypathesis. Nothing to install.
check_device_auth is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the check_device_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 check_device_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.
check_device_auth is provided by the Hypathesis MCP server (https://hypathesis.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Hypathesis tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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