Slice cucumbers into thin rounds or half-moons; add to a large bowl.
Add red onion, shredded carrot, cilantro, and sesame seeds to the bowl.
Whisk peanut butter, soy sauce, rice vinegar, lime juice, sriracha, honey, ginger, and garlic until smooth.
Add warm water gradually until the dressing becomes pourable.
Taste and adjust seasoning—add more lime, honey, or sriracha as needed.
Pour the dressing over the cucumber mixture.
Toss gently until everything is evenly coated without crushing the cucumbers.
Let the salad rest 5–10 minutes before serving.