a16z leads a $20M seed into Runta at a $100M+ valuation for its agent execution layer — sandboxes, spending caps and audit trails that treat agents like children who need supervision. Martin Casado called it 'core systems software rebuilt for agents'; the round came after prompt-injection containment failures made agent governance urgent.
Restate raises $20M to 'define the infrastructure layer for AI agents and workflows' — its lightweight durable runtime journals every agent step so invocations survive crashes. The round underlines durable execution as the best-funded sub-category of agent infrastructure.
Arcade.dev raises a $60M Series A for its agent authorization layer — OAuth-backed tool execution and credential management so agents act on users' behalf without god-mode access. 'What agents can do' joins execution and governance as a funded category of the harness stack.
Durable-execution leader Temporal closes a $300M Series D led by a16z at a $5B valuation, reporting 380% YoY revenue growth and 20M+ monthly installs. The agent-infra thesis in one round: in-memory agent state breaks in production, and durable execution is the production architecture.
The AI-native editor's latest round makes it one of the fastest-growing software companies ever — a bellwether for how central agentic coding has become to the harness economy.