Enterprise Security in the Age of AI Agents

When an AI agent has access to your emails, calendars, documents, and team communications, the security bar cannot be "good enough." It has to be exceptional. In this post, we outline the security architecture behind Tim and the principles that guided every design decision.

The foundation of Tim's security model is strict tenant isolation. Every customer's data is processed and stored in a dedicated, logically isolated environment within Azure. Tim's runtime containers are spun up per-tenant, and there is zero shared state between customers. Even our internal engineers cannot access customer data without an explicit, time-limited authorization that is logged and auditable. This architecture exceeds the requirements of most enterprise security reviews, and it's non-negotiable -- we will not optimize for cost at the expense of isolation.

Tim operates on the principle of least privilege. When you connect Tim to your Microsoft 365 and Slack workspaces, it requests only the specific Graph API permissions required for the features you enable. If you only want Tim to manage your calendar, it never gains access to your files or email. Permissions are granular, revocable at any time, and transparently displayed in the admin dashboard. We also support Conditional Access policies, so organizations can enforce additional restrictions like requiring compliant devices or specific network locations.

All data in transit is encrypted with TLS 1.3, and all data at rest uses AES-256 encryption with customer-managed keys available on our Enterprise plan. Tim's working memory -- the contextual data it uses to understand your workflows -- is encrypted at rest and automatically purged according to retention policies you configure. We never use customer data for model training, and we never will. This commitment is baked into our data processing agreements and verified by third-party auditors.

Our audit logging system captures every action Tim takes: every API call, every document access, every message sent. These logs are immutable, timestamped, and available to workspace admins in real-time through the Tim dashboard. For organizations with existing SIEM infrastructure, we support streaming audit logs directly to Microsoft Sentinel, Splunk, or any webhook endpoint. When questions arise about what Tim did and why, the answers are always available.

We are currently pursuing SOC 2 Type I certification, with our audit period underway. Our security practices have also been reviewed by independent penetration testing firms who conducted both black-box and white-box assessments of Tim's infrastructure. We publish a summary of findings and remediation timelines in our security portal, because we believe transparency is itself a security feature. Enterprise trust isn't earned with a badge -- it's earned with consistent, verifiable rigor.