before-dev

name: before-dev description: "Discovers and injects project-specific coding guidelines from .trellis/spec/ before implementation begins. Reads spec indexes, pre-development checklists, and shared thinking guides for the target package. Use when starting a new coding task, before writing any code, switching to a different package, or needing to refresh project conventions and standards."

Read the relevant development guidelines before starting your task.

Execute these steps:

1. Read the project entry first:

   cat AGENTS.md
   

2. Discover packages and their spec layers:

   python3 ./.trellis/scripts/get_context.py --mode packages
   

3. Identify which specs apply to your task based on:

   • Which implementation layer you're modifying (frontend, backend, or repo-level docs/governance)
   • What type of work (backend, frontend, unit-test, docs, etc.)

4. Read the spec index for each relevant module:

   cat .trellis/spec/frontend/index.md
   cat .trellis/spec/backend/index.md
   

   Follow the "Pre-Development Checklist" section in the index.

5. Read the specific guideline files listed in the Pre-Development Checklist that are relevant to your task. The index is NOT the goal — it points you to the actual guideline files (e.g., error-handling.md, conventions.md, mock-strategies.md). Read those files to understand the coding standards and patterns.

6. Always read shared guides:

   cat .trellis/spec/guides/index.md
   

7. If the task changes rule entry, documentation governance, ignore policy, or host hooks, also read:

   cat .trellis/spec/guides/project-instruction-layering-guide.md
   

8. Understand the coding standards and patterns you need to follow, then proceed with your development plan.

This step is mandatory before writing any code.