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Treat unauthorized requests from an AI agent as a website security incident: determine what it requested and accessed, preserve the evidence, contain the activity, and fix the authorization gap. Don’t assume a request is malicious just because it came from an AI-labelled or unfamiliar client; judge it against your site’s access policy.
1. Scope what happened
Start by establishing which requests crossed your policy boundary, rather than treating every unusual request as an incident. An unfamiliar user-agent or bot-like traffic pattern on its own is not proof of abuse; OWASP cautions against blocking users solely on that basis in its Bot Management and Anti-Automation Cheat Sheet.
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- Identify affected routes, request types, time period, response codes, and relevant identities or sessions.
- Check whether requests only reached a page or endpoint, or whether they accessed data, changed records, sent messages, triggered purchases, or consumed significant resources.
- Compare each request with the permissions and rules that should govern that route. Separate unusual traffic from activity that actually violated authorization.
2. Preserve useful evidence safely
Save relevant request and security-decision logs before routine rotation removes them. OWASP recommends collecting enough context to investigate, while masking credentials and personal data and limiting retention of raw signals.
- Record timestamps, request IDs, routes, status codes, client IP or network context, and user-agents.
- Include an authenticated identity or session identifier when available, along with the security signals observed and the decision applied.
- Restrict access to the logs and avoid retaining secrets or personal information unnecessarily.
3. Contain the activity in proportion to the risk
Choose a response based on how confident you are that the activity is abusive, the harm that could occur if it continues, the effect on legitimate users, reversibility, and the evidence the response will preserve. OWASP recommends graduated responses and endpoint-specific limits rather than one blunt rule for all traffic.
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- Unclear or low-impact activity: log and monitor while you investigate.
- Suspicious activity with manageable risk: challenge the client or throttle requests on the affected route.
- Credible risk tied to an identity or session: suspend that session or identity while you review its access.
- Clearly abusive requests: block the specific action or source where appropriate, rather than relying on a broad rule that may affect legitimate visitors.
4. Fix the authorization boundary
If the agent operates through your application, tools, extensions, API keys, or user sessions, check what permissions were actually granted. An agent’s instructions or reasoning are not an authorization control: the downstream application or API must decide whether each request is allowed.
- Review the agent’s active credentials, session, and tool permissions, and revoke or narrow access that is no longer needed.
- Require the downstream service to authorize each operation against the authenticated identity and the action requested.
- Grant the agent only the capabilities needed for its task. OWASP’s AI Agent Security Cheat Sheet puts it plainly: “Grant agents the minimum tools required for their specific task.”
- Require explicit authorization for sensitive operations rather than letting an agent infer permission from a prompt or workflow.
5. Check consequences and recover
Use the scoped request history to determine whether the incident exposed information, altered records, caused an external action, or consumed resources. Follow your organization’s incident process through recovery and lessons learned; NIST’s Computer Security Incident Handling Guide covers incident handling from preparation through post-incident learning.
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6. Reduce the chance of a repeat
Set rate limits appropriate to individual routes and identities, watch for unusual request patterns, and, where feasible, log both accepted and rejected attempts. Keep enough context to investigate future incidents while minimizing sensitive data in logs. Revisit permissions and authorization checks when you change agent integrations or downstream APIs.
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Robots.txt does not block unauthorized access
robots.txt communicates crawler preferences; it does not enforce access control. NIST’s Guidelines on Securing Public Web Servers describes the convention as voluntarily supported by bot programmers and notes there is no requirement to use it. A malicious or otherwise unauthorized client can ignore the file. Protect restricted paths with authentication and server-side authorization instead.
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