--- title: "Structured Agentic Development on a Real Codebase" url: https://daily.dev/posts/structured-agentic-development-on-a-real-codebase-bln5ltgtw source_url: https://8thlight.com/insights/teaching-the-agent-our-craft-structured-agentic-development-on-a-real-codebase type: article source: "8th Light" published: 2026-07-06T20:25:34.168Z updated: 2026-07-07T02:21:03.175Z tags: ["mcp", "claude-code", "tdd"] reading_time: 14 upvotes: 2 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Structured Agentic Development on a Real Codebase **[8th Light](https://daily.dev/sources/8thlight)** · 14 min read · 2 upvotes · 0 comments ## Summary 8th Light describes a structured agentic development harness built around Claude Code for a real healthcare startup project. The framework adapts the Research-Plan-Implement methodology with a CLAUDE.md knowledge root, path-scoped rules files that load context-relevant conventions automatically, MCP integrations connecting Linear and Figma directly to the agent, and two core workflow skills: /story-writer for research and planning, and /tdd-build for TDD-driven implementation. A key innovation is a test-writer subagent that operates in a fresh context window with no visibility into implementation code, enforced by a hook that restricts file writes to test paths only. The result: a two-developer team delivered a multi-tenant platform with an AI coaching companion while maintaining code quality, architectural consistency, and tight product-design-engineering feedback loops. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#mcp](https://daily.dev/tags/mcp), [#claude-code](https://daily.dev/tags/claude-code), [#tdd](https://daily.dev/tags/tdd) [View this post on daily.dev](https://daily.dev/posts/structured-agentic-development-on-a-real-codebase-bln5ltgtw)