Show HN: Pglens – 27 read-only PostgreSQL tools for AI agents via MCP vs Show HN: Agent Kernel – Three Markdown files that make any AI agent stateful

Show HN: Pglens – 27 read-only PostgreSQL tools for AI agents via MCP vs Show HN: Agent Kernel – Three Markdown files that make any AI agent stateful 2026年の徹底比較。各AIの評価・価格・強み・制限を並べて確認し、最適なものを選びましょう。