Pick a fixed period, a small set of repositories, one owner and a written list of success and stop criteria. Track setup effort, noise, data freshness and time spent. At the end, decide in a meeting: adopt, extend, or switch to a managed platform. Without stop rules, experiments turn into permanent, unowned tooling.
Why a time box
An open source scanner is free to start and easy to leave half installed. The expensive part, ongoing ownership, only shows after weeks. A time boxed trial surfaces it while the decision is still cheap to reverse.
Week 0: write the charter
One page, agreed with your security lead.
- Scope: three to five repositories across at least two languages you really use.
- Owner and backup: named people, with hours set aside.
- Questions to answer: does it support our ecosystems, how noisy is it, how fresh is its data, how much time does it take?
- Stop rules: for example, "if setup is not working on two repositories by the end of week one, we stop".
Weeks 1 to 3: measure
| Measure | How |
|---|---|
| Setup effort | Log hours per repository |
| Coverage | Which lockfiles and ecosystems were read, which were missed |
| Noise | Sample 30 findings, classify real, not reachable, wrong |
| Freshness | Use the lag test in our post on measuring advisory to detection lag |
| Developer reaction | Five question survey after two weeks |
| Maintenance | Log time on upgrades, failures, tuning |
Our guide to measuring scanner noise in a trial explains the sampling.
Week 4: decide
Hold a one hour meeting with the owner, a developer representative and the security lead. Review the measures against the charter. Choose one outcome.
| Outcome | When |
|---|---|
| Adopt | Criteria met, owner confident, yearly health check scheduled |
| Extend | Promising but one question open, add two weeks with a specific test |
| Switch to managed | Maintenance or freshness gaps exceed what the team can absorb |
| Stop | Not worth it for the current stage |
Avoid the usual traps
- Testing only on a clean sample project. Use real repositories with real history.
- Letting the enthusiast run the trial alone. Include someone who did not choose the tool.
- Counting findings as a success. More findings may mean more noise.
- Forgetting the exit plan. Note how you would move if you adopt and later change your mind.
After the decision
Whatever you choose, put it on a calendar: a data freshness test each quarter, a project health check each year, and a review whenever the team or the number of repositories doubles.
If you also want a managed comparison in the same period, Safeguard offers a free scan at gold.safeguard.sh/scan you can run on the same repositories.
Quick check
How many repositories should a trial include?
Three to five that represent your real languages and sizes is usually enough to expose gaps without a big commitment.
Who should make the final decision?
The engineering manager, with input from the scanner owner, a developer representative and the security lead.
Last reviewed: 19 October 2026.
