Sol Foundry raises $4M for proactive email AI

Sol Foundry emerged from stealth with $4 million to build an email agent that spots commitments in Gmail and begins research, documents, slide decks, scheduling, or replies before a new prompt. The funding announcement says users retain approval before final actions and Sol’s environment draws on more than 100 specialist skills; Inc42’s launch report says initial access is through Google Workspace and a waitlist. Proactive inbox agents shift risk from prompting to permission, so builders should measure false commitments and require approval before external sends, extending the consent-budget case for AI build tools.