An AI startup should adopt dependency scanning and secrets detection first, because model-serving and agent products pull in a large, fast-moving set of open source packages. Add a pull request gate next, then container image scanning, then API and web testing as enterprise customers start asking for evidence.
Why dependencies come before everything else
An LLM app is mostly other people's code: a web framework, a model runtime, an agent library, a vector client, and dozens of transitive packages. OWASP lists supply chain as its own risk for LLM applications (LLM03:2025) and names vulnerable packages, weak model provenance, and unclear licenses among the causes. Your own code is usually the smaller part of the attack surface.
Software composition analysis (SCA) means inventorying every package your product uses and matching it against known vulnerability data. It is cheap to start and it produces the inventory that every later tool and every customer questionnaire needs.
An adoption order, by trigger
| Order | Tool type | Adopt when | What it gives you |
|---|---|---|---|
| 1 | Dependency scanning (SCA) and lockfiles | Day one | Inventory and known-vulnerability alerts |
| 2 | Secrets detection | First API key is in a repo | Stops leaked provider and cloud keys |
| 3 | Pull request gate | More than two engineers merge code | Stops new critical issues from landing |
| 4 | Container image scanning | First production image ships | Covers OS and runtime packages |
| 5 | SAST (code scanning) | Auth, billing or tenant logic appears | Finds flaws in your own code |
| 6 | API and web testing (DAST) | First external customer uses the API | Tests the running service |
| 7 | Compliance evidence automation | First security questionnaire or audit request | Collects proof you already operate controls |
The order is a default, not a rule. If your first customer is a regulated buyer, move evidence collection up.
What to skip for now
Skip anything that needs a dedicated analyst to read its output. A tool nobody triages is worse than no tool, because it creates false comfort. Pick tools whose alerts can be ranked by reachability, so a two-person team sees the handful that matter.
Try it yourself
Step through the dependency inventory demo below. Look at how many packages a small project really includes and which ones are transitive.
Click through it at your own pace, or open it full screen.
A short note on Safeguard
Safeguard offers SBOM and dependency scanning, reachability analysis, policy gates, and compliance and evidence automation. You can try a free scan at gold.safeguard.sh/scan. For a fuller 90 day plan, see the first 90 days security baseline for an AI startup.
Quick check
Do we need SAST before our first customer?
Usually not. Dependency scanning and secrets detection find the most common problems for the least effort. Add SAST once you have custom authentication, billing, or tenant isolation code worth reviewing.
Does a dependency scanner find prompt injection?
No. Prompt injection is a design and testing problem. Scanners cover the packages and code around the model.
Sources
Last reviewed: 19 October 2026.
