In Hesiod’s account, Hermes gave Pandora a deceptive nature and persuasive speech.
Works and Days describes the gods contributing different qualities to Pandora after Hephaestus forms her from earth. Hermes, the Olympian messenger, supplies speech and is associated in the passage with a deceptive or crafty character. This contribution fits his wider mythological profile as a god of boundaries, travel, trade, messages, and trickery.
The gifts are not presented as a modern list of personality traits created by one psychological author. They belong to a poetic explanation of why Pandora appears beautiful and compelling while also bringing hardship to mortals. Other deities contribute additional adornments or abilities, making the creation a collective divine project.
Later retellings often compress the scene into the statement that every god gave Pandora one gift. That summary is broadly inspired by her name, but Hesiod assigns particular contributions to particular gods. Hermes’s role is therefore more specific than simply being one of the gods present.