Lightsage raises $4M for agent-led growth

Lightsage raised $4 million led by Nexus Venture Partners to help software companies measure whether AI agents can discover, use, and pay for their products, according to the funding announcement. Its platform simulates workflows across coding agents, APIs, SDKs, CLIs, MCP servers, and agent skills, then traces failures from documentation to authentication. The AI SEO frontier is shifting from persuading humans to making software legible and executable for machine buyers: developer-tool teams should test agent success as a product metric before buying another traffic dashboard.