<p>The increasing need for integrative and alternative medical therapies, especially in the aftermath of the COVID-19 epidemic, has emphasized the importance of medicinal plants in worldwide healthcare. These plants, which contain abundant bioactive secondary metabolites, provide a sustainable and cost-effective option for medicinal, adaptogenic, and immune-boosting purposes. Blooming medicinal plants that exist are at risk of becoming extinct because of excessive harvesting, deforestation, and wildfires. Medicinal plants have complex physiological defenses against stress, which are strengthened by their symbiotic relationship with endophytes. Endophytes are microbial colonies that live within plant tissues without causing harm and play a vital role in maintaining the health of plants by helping them to tolerate stress, promoting development, acquiring nutrients, synthesizing phytohormones, breaking down toxic substances, and improving plant resistance to environmental pressures such as high salt levels, lack of water, and exposure to heavy metals. In addition, endophytes have a role in managing biotic stress by engaging in antibiosis, synthesizing lytic enzymes, producing secondary metabolites, and regulating hormones. Their function in preserving the health and well-being of the host, ensuring proper nutrition intake, and enhancing resistance against pathogens highlights their potential as agents for biological control and biofertilization, providing a safer option compared to chemical pesticides. Endophytic inoculants have the potential to significantly transform crop yield in agriculture by reducing the impact of abiotic problems and improving soil health. This review critically evaluates causal studies and recent omics-based advances, highlighting their crucial significance for sustainable bioinoculant development and practical applications in climate–resilient agriculture.</p> Graphical Abstract <p></p>