Lightsage is a San Francisco-based startup building an Agent-Led Growth (ALG) platform that helps software companies understand and improve how AI agents discover, evaluate and use their products. Founded by CEO Jun Liang Lee and CTO Sean Er, the platform runs large-scale simulations across coding agents such as Claude Code, Codex, Cursor, GitHub Copilot and OpenCode plus answer engines — testing real tasks across documentation, APIs, SDKs, CLIs, MCP servers and agent skills — pinpoints where agents fail, and tracks real agent traffic to show whether agent visits turn into product usage. Customers include developer-tools companies such as Firecrawl, Reducto, Daytona, Rime and Tinyfish.
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Sep 8, 2026
Latest raise
Funding activity · 1 round
Sep 8, 2026
$4M
Seed
Led by Nexus Venture Partners
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