List assets and trust boundaries
Name what needs protecting and exactly where data crosses from less trusted to more trusted zones.
STRIDE-STYLE PROMPT
Threat Modeling Prompt Builder
Generate a structured prompt covering assets, trust boundaries, threats, and mitigations for an AI-assisted threat model.
- Uses your inputs in a transparent calculation
- Instant result with practical next steps
- No signup required
Planning guidance only. Validate important decisions with customer evidence and your delivery team.
YOUR INPUTS
Build your result
Complete every field. The result updates only when you choose Calculate.
How it works
Note known threats
Injection, privilege escalation, and data exposure are common starting categories to check against each boundary.
Record existing mitigations
What's already in place shows an AI agent what to build on rather than duplicate.
Continue learning: Security basics for MVPs
Frequently asked questions
What is a trust boundary?
Any point where data moves from a less trusted context to a more trusted one — client to server, third-party API to internal system, or public input to internal processing.
Do I need security expertise to use this?
Basic familiarity helps, but the structure itself (assets, boundaries, threats, mitigations) is the STRIDE-style framework used precisely so non-specialists can produce a useful first draft.
Is this a replacement for a professional security review?
No — it's a structured starting prompt for AI-assisted analysis, useful for catching obvious gaps early. High-stakes systems still need expert review.
How is completeness scored?
Each of the four sections is checked for at least 10 characters of real content; the score is the percentage of sections that pass.
How We Compare
| Feature | MVPHub | OWASP Threat Dragon | Notion |
|---|---|---|---|
| Structured 4-section prompt draft | Included | Limited | Not included |
| Completeness scoring | Included | Not included | Not included |
| No account required | Included | Included | Not included |
| Visual diagramming of data flows | Not included | Included | Not included |
OWASP Threat Dragon provides visual data-flow diagramming for formal threat models. This tool is a fast, plain-language starting prompt to hand to an AI coding agent before that level of formality.
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