Type: url
Status: generated
Summary
A Mercari Engineering post describing mercari-pm-agent, a Claude Code Skill built during an internship that carries a product manager’s workflow — problem discovery, data gathering, PRD drafting and UI mockups — through a single session, pulling from Notion, Slack, an in-house Looker/BigQuery platform and Figma over MCP. Its design findings are that splitting a long SKILL.md into a thin behaviour definition plus a references/ directory measurably improved output scores, that MCP sources should be queried in parallel with silent fallback when one is unavailable, and that constraints against fabricating data matter more than instructions to perform it. The author defines evaluation criteria before implementation — an approach the post calls Prompt TDD — and built a second skill whose job is to score the first one’s output.