Mercury Agent details token saver, smart model routing

Agent frameworks notoriously burn through tokens during autonomous loops, making cost control a major pain point for developers. Mercury's approach of treating token usage like a smartphone battery saver mode is a highly practical solution for long-running background agents. Token Saver Mode produces terser responses and curtails reasoning steps to prevent context window bloat during routine tasks, while smart routing automatically switches between free local models and premium cloud APIs depending on task difficulty. This gives developers granular control over the agent's spending limits without sacrificing its 24/7 autonomous capabilities. It also combines cost controls with a SQLite-backed memory system, allowing the agent to persist context without continuously injecting full history into prompts.