Run an EDR trial on a mixed group of real devices, including servers and developer machines. Measure performance impact, detection of safe test activity, how clearly alerts explain themselves, and how easily you can contain a device. Score against criteria you wrote before installing anything.
Which devices belong in the pilot?
A trial on ten identical office laptops tells you little. Build a group of 20 to 40 devices, or whatever share suits your size, covering:
- Each operating system you run.
- At least a few servers, if EDR will cover servers.
- Developer workstations, which run unusual tools and compilers.
- One or two older or slow machines.
- Devices used by staff who travel or work remotely.
Get the owners to agree. Developers will notice slow builds first, so include them on purpose.
Days 1 to 3: install and observe
Deploy the agent through the same method you would use at scale, not by hand. Record how long it took, what failed, and whether a restart was needed. Leave it in detect only mode first, if the product offers it.
Capture a baseline: CPU and memory use, boot time, and the time of a standard build or large file operation, before and after the agent. Use the same test on each device type.
Days 4 to 7: exclusions and noise
Count alerts. Review each one with the device owner: real, harmless or unknown. Developer tools often trigger alerts. Note how easily you can create exclusions and whether they are scoped narrowly, for example by path and process, rather than by turning off a whole rule.
Days 8 to 10: safe test activity
With written approval, run harmless tests on pilot devices only. The aim is to see whether the tool notices a behavior, not to hack anything. Examples of constructed, safe tests: a standard antivirus test file designed to be detected, a script that runs a common administrative tool in an unusual way, or a test account logging in at an odd hour. MITRE ATT&CK helps you describe each test as a named behavior so you can ask what the tool covers.
Record the time between the action and the alert, and whether the alert described the behavior in words an analyst understands.
Days 11 to 12: response
Test containment on a pilot device: isolate it from the network and release it. Check that you can still reach it to remediate, who can trigger it, and whether the action is logged. Try it from a phone or laptop outside the office, in case you need to act away from your desk.
Days 13 to 14: score
| Criterion | Question |
|---|---|
| Performance | Did builds or boot times change in a way staff noticed? |
| Detection | Which safe tests were noticed, and how fast? |
| Alert clarity | Could an analyst tell what happened without searching elsewhere? |
| Tuning | Could you cut noise without blinding the tool? |
| Response | Is isolation quick, reversible and logged? |
| Operations | Was deployment and removal predictable? |
Also ask about uninstall. A trial that cannot be cleanly removed is a sign of how exit will go.
What about the tricky parts?
Tamper protection can block your own cleanup. Agents can conflict with other security software. Ask about both before you start. Keep a rollback plan, including a named person who can remove the agent on every pilot device.
NIST SP 800-61 Rev. 3 treats detection and response as part of a wider cycle with preparation and recovery. A pilot should test the handoff to your incident process too: who is called and what is recorded.
Where Safeguard fits
EDR is not part of Safeguard and Safeguard does not replace it. Safeguard focuses on the application and software supply chain side: reachability analysis, policies and gates at build, CI and release, and compliance evidence. Endpoint detection and software supply chain controls address different stages of the same story.
What to do
- Assemble a pilot group that covers every OS, servers and developer machines.
- Measure performance before and after on the same tasks.
- Review every alert with the device owner and test narrow exclusions.
- Run approved, harmless tests and record time to alert.
- Test isolation, release and logging.
- Score six criteria and test uninstall before you decide.
Quick check
Should the trial start in block mode?
Start in detect only mode if available, review alerts for a few days, then enable blocking on a subset. That limits disruption for developers and servers.
How many devices do I need?
Enough to cover each OS, device role and work pattern you run, usually a small slice of the fleet rather than one uniform group.
Sources
- NIST SP 800-61 Rev. 3, Incident Response Recommendations
- MITRE ATT&CK
- NIST SP 800-137, Information Security Continuous Monitoring
Last reviewed: 18 October 2026.
