AI is the biggest productivity unlock in a decade. It is also the largest blind spot in your security stack. Sensitive prompts leave laptops through ChatGPT, Claude, Cursor, and tools your DLP, CASB, and browser controls never touch. Themisto runs on every laptop and governs each request before it leaves, so engineers keep shipping and security keeps control.
INTERCEPT.
GOVERN.
PROTECT.
Themisto sees AI requests leaving the laptop, attributes them to the originating process, and enforces policy before the bytes go out. OS-level proxy on Windows and macOS. Mutual TLS on the managed path between agent and gateway. Forward, bypass, alert, or block, decided locally in milliseconds.
FROM INSTALL
TO ENFORCEMENT
Install a small agent on the laptop. See every AI request along with the app that made it. Apply your rules. Stop the risky ones before they leave the device.
INSTALL ON THE LAPTOP
A small agent runs on each employee laptop.
Windows or macOS, MDM-deployable in minutes. The agent sets itself up as the system gateway for network traffic and opens an encrypted channel back to your Themisto tenant. No browser extension, no manual config.
SEE EVERY REQUEST
Every AI request gets seen, with the app that made it.
Because the agent sits below the browser and every desktop app, it catches requests from Chrome, Cursor, Claude Desktop, CLI tools, anything. Requests are attributed to the originating process whenever it can be resolved, so you can tell it was Cursor and not a browser.
APPLY YOUR POLICY
Your rules decide what happens next.
The agent checks each request against your rules. Allow this vendor. Block this one. Flag this one for review. The decision happens on the laptop in milliseconds so nothing leaves the device until it is approved.
LOG, SHIP, OR STOP
Approved traffic ships. Risky traffic is stopped before it leaves.
Allowed requests go to the AI vendor normally. Blocked requests never leave the laptop. Everything is logged with the user, app, destination, and decision, so audits write themselves.
YOUR CURRENT STACK
MISSES THE HARD PART.
Most AI security tools were built for the AI traffic they can already see. The problem is the AI traffic they cannot see: a desktop IDE talking to a model endpoint, a terminal piping output to an LLM CLI, a junior engineer on hotel Wi-Fi. That is where the leaks live. That is where Themisto sits.
THREE ORDINARY TUESDAYS.
THREE QUIET LEAKS.
Every scenario below is a good employee trying to ship. None of them are breaking a rule on purpose. Each one creates an exposure your current stack cannot see. Themisto is what stops it without getting in anyone’s way.
A support lead pastes a customer list into ChatGPT to draft emails.
3:47 PM on a Tuesday. Nobody is breaking a rule on purpose. The tool is genuinely faster.
- ×Your DLP does not see it. The request leaves the browser over TLS.
- ×Your CASB does not see it. ChatGPT is a sanctioned app category.
- ×You find out, if ever, in a quarterly audit.
- ✓Themisto sees the request the moment it leaves the laptop.
- ✓Customer PII is detected in the prompt. The request is blocked before it hits the internet.
- ✓The employee gets a clear message. Your team gets an event with who, what, and when.
A contractor uses Cursor to debug your production service.
They are on their own laptop, on hotel Wi-Fi, shipping a fix on deadline.
- ×Source code, internal hostnames, and a real API key are in the prompt.
- ×Your browser extension does not cover Cursor. It is a desktop app, not a web page.
- ×The key ends up in a third-party training pipeline you have no visibility into.
- ✓The agent runs on the contractor laptop, off your network, on any Wi-Fi.
- ✓The API key is detected in the prompt and the request is blocked before it leaves the device.
- ✓The contractor sees a clear message and reruns without the secret. You did not leak a credential.
An engineer signs up for a new AI code review tool you have never heard of.
They pay with a personal card. They paste your repo. It is genuinely useful.
- ×No procurement ticket. No security review. No record.
- ×By the time a browser extension could flag it, a thousand lines of your code have been sent.
- ×Multiply by fifty engineers and a long tail of tools. That is shadow AI.
- ✓The tool shows up in your dashboard the first time it makes a request.
- ✓You decide: sanction it or block it, in one click, for the whole fleet.
- ✓Engineers keep experimenting. Security keeps the receipts.
SEE EVERYTHING.
CONTROL EVERYTHING.
SEE EVERY AI REQUEST
For intercepted AI requests, the agent attributes each one to the originating app whenever the process can be resolved. Browser, IDE, terminal, or something a contractor installed last week. No more guessing.
- Host and path visibility
- Process-level attribution when available
- Signed-process context for local policy decisions
- Complete audit trail
Five AI requests from one laptop. Themisto knows which app made each one and decides forward, block, or bypass in real time.
Allow the vendors you trust. Block the rest. Send internal traffic direct. Watch code generation closely. Four rules, four decisions.
DECIDE WHAT IS ALLOWED
Write rules the way you think about them. Allow the vendors you sanctioned. Block the ones you did not. Send internal traffic straight through. Every rule ends in one of three answers: let it go, send it direct, or stop it. That is the whole model.
- Rich matching operators (eq, regex, glob)
- Process-aware rules
- Three decision modes
- Automatic policy sync
THREE TIERS.
MTLS ON THE MANAGED PATH.
Intercepted requests are evaluated against your policies before they leave the device.
OS-level proxy installed on each device
Encrypted relay with certificate verification
Certificate authority & administration
THE DASHBOARD.
NOT A MOCKUP.
Three shipped views from the Themisto customer console: what AI your team is using, what we stopped before it left the device, and every request moving through the fleet.
See every AI request.
Every AI service your team touches, classified in real time and enforceable from one control surface.
AI Usage
Track sanctioned and unsanctioned AI activity by vendor, source surface, and device so policy decisions stay grounded in real usage.
| Vendor | Category | Requests | Blocked | Sanction | Risk Tier | Enforcement |
|---|---|---|---|---|---|---|
openai | LLM / Chat | 7,842 | 0 | Sanctioned | medium | Mark Unsanctioned |
anthropic | AI Coding | 4,116 | 0 | Sanctioned | high | Mark Unsanctioned |
github | AI Coding | 3,482 | 0 | Sanctioned | medium | Mark Unsanctioned |
cursor | AI Coding | 2,903 | 0 | Sanctioned | medium | Mark Unsanctioned |
perplexity | AI Search | 1,128 | 31 | Unsanctioned | high | Mark SanctionedUnblock Vendor |
mistral | LLM / Chat | 902 | 52 | Unsanctioned | critical | Mark SanctionedUnblock Vendor |
Stop sensitive content before egress.
Sensitive prompts are detected, classified, and stopped before they leave the device.
DLP Events
Sensitive prompt detections, policy outcomes, and captured bodies.
| Time | Host | App | AI Vendor | Detections | Patterns | Outcome | Severity | Why | Prompt |
|---|---|---|---|---|---|---|---|---|---|
| Apr 18, 09:14 AM | api.openai.com | chrome.exe | openai | PII | email_address, us_phone | Blocked | HIGH | DLP policy blocked. | Captured |
| Apr 18, 09:11 AM | api.anthropic.com | code.exe | anthropic | Source Code | source_code, repo_path | Alerted | MEDIUM | Detected, alert mode. | Captured |
| Apr 18, 08:57 AM | copilot-proxy.githubusercontent.com | code.exe | github | Credentials | aws_access_key, bearer_token | Blocked | CRITICAL | DLP policy blocked. | Captured |
| Apr 18, 08:26 AM | api.anthropic.com | chrome.exe | anthropic | PIIKeyword | us_phone, renewal_terms | Blocked | HIGH | DLP policy blocked. | Captured |
| Apr 18, 07:41 AM | api.openai.com | code.exe | openai | CredentialsKeyword | private_key, internal_project | Blocked | CRITICAL | DLP policy blocked. | Captured |
Every request, every decision, streaming.
Every request is timestamped, measured, and decided across the fleet in real time.
Telemetry
Inspect request flow, decision outcomes, and high-volume hosts across monitored traffic.
| Time | Method | Host | Status | Latency | Decision | Device |
|---|---|---|---|---|---|---|
| Apr 18, 09:18 AM | POST | api.openai.com | 200 | 182ms | allow | 7fa91c2b |
| Apr 18, 09:17 AM | POST | api.anthropic.com | 403 | 96ms | block | 21b4e77d |
| Apr 18, 09:16 AM | POST | copilot-proxy.githubusercontent.com | 200 | 74ms | allow | a88219ef |
| Apr 18, 09:15 AM | POST | api.perplexity.ai | 403 | 88ms | block | 4d62bc18 |
| Apr 18, 09:14 AM | GET | api.openai.com | 200 | 41ms | log_only | 7fa91c2b |
| Apr 18, 09:13 AM | POST | api.mistral.ai | 403 | 102ms | block | 6c0f9a44 |
YESTERDAY'S RULES
CAN'T STOP TODAY'S AI RISKS.
Legacy security tools weren't designed for a world where every employee has access to powerful AI. Themisto was built for exactly this world.
mTLS BY DEFAULT
Mutual TLS between agent and gateway. Device enrollment issues cryptographic identity automatically, with revocable client certificates.
OS-LEVEL INTERCEPTION
Not a browser plugin. Not an API wrapper. A system proxy that captures HTTP/HTTPS traffic at the OS level, with process-level attribution.
PROCESS-LEVEL RESOLUTION
Know exactly which application made each request. Match policies against process name, path, and code signatures. See if it was Chrome, VS Code, or a rogue script.
TAMPER DETECTION
Integrity monitoring detects agent tampering and supports automatic re-registration when configured. Circuit breakers protect against gateway failures. Policies are cached locally and synced automatically.
BUILT FROM SCRATCH.
NOT BOLTED ON.
WINDOWS
- WinINET system proxy via registry
- Certificate store (Local Machine Root)
- Windows Service Manager integration
- GetExtendedTcpTable process resolution
- PowerShell network interface detection
MACOS
- System preferences proxy configuration
- Keychain certificate management
- launchd service integration
- lsof-based process resolution
- Network interface and VPN detection
BUILT FOR SCALE.
POLICY EVALUATION
DEFAULT CONCURRENCY
AGENT ↔ GATEWAY
CONTINUOUS MONITORING
ENTERPRISE-GRADE
BY DESIGN.
VERIFY EVERYTHING
No implicit trust. Intercepted requests are evaluated against your policies before they leave the device.
MTLS AGENT ↔ GATEWAY
The managed path between the agent on each device and the Themisto gateway is authenticated with mutual TLS certificates.
PROCESS ATTRIBUTION
When process resolution succeeds, every request is tagged with the originating app, not just the domain.
TAMPER RESISTANT
Integrity monitoring detects tampering and supports automatic re-registration when configured. Policies work even when offline.
SEE WHAT YOUR FLEET IS SENDING TO AI TOOLS.
Thirty minutes. Live product on a real laptop. Honest about what it does and does not do.
ONE OF THE CO-FOUNDERS.
You’re talking directly to the people building Themisto. Relaxed conversation, honest answers — we’ll show you what we’ve got and learn about what you need.