/compound-docs

name: compound-docs
description: "Searchable Elixir/Phoenix/Ecto solution documentation system with YAML frontmatter. Builds institutional knowledge from solved problems. Use when consulting past solutions before investigating new issues."
effort: low
user-invocable: false

Compound Docs — Institutional Knowledge Base

Searchable, categorized solution documentation that makes each debugging session easier than the last.

Directory Structure

.claude/solutions/
├── ecto-issues/
├── liveview-issues/
├── oban-issues/
├── otp-issues/
├── security-issues/
├── testing-issues/
├── phoenix-issues/
├── deployment-issues/
├── performance-issues/
└── build-issues/

Iron Laws

1. **ALWAYS search solutions before investigating** — Check `.claude/solutions/` for existing fixes before debugging 2. **YAML frontmatter is MANDATORY** — Every solution needs validated metadata per `${CLAUDE_SKILL_DIR}/references/schema.md` 3. **One problem per file** — Never combine multiple solutions 4. **Include prevention** — Every solution documents how to prevent recurrence

Solution File Format

---
module: "Accounts"
date: "2025-12-01"
problem_type: runtime_error
component: ecto_schema
symptoms:
  - "Ecto.Association.NotLoaded on user.posts"
root_cause: missing_preload
severity: medium
tags: [preload, association, n-plus-one]
---

# Association NotLoaded on User Posts

## Symptoms
Ecto.Association.NotLoaded raised when accessing user.posts
in UserListLive after filtering.

## Root Cause
Query in Accounts context missing preload for :posts.

## Solution
Added `Repo.preload(:posts)` to `list_users/1`.

## Prevention
Use n1-check skill before shipping list views.

Searching Solutions

Use Grep to search `.claude/solutions/` by symptom (e.g., `NotLoaded`), by tag (e.g., `tags:.*preload`), or by component (e.g., `component: ecto`).

Integration

• `/phx:compound` creates solution docs here
• `/phx:investigate` searches here before debugging
• `/phx:plan` consults for known risks
• `learn-from-fix` feeds into this system

References

• `${CLAUDE_SKILL_DIR}/references/schema.md` — YAML frontmatter validation schema
• `${CLAUDE_SKILL_DIR}/references/resolution-template.md` — Full solution template