Compound — Capture Solutions as Knowledge

After fixing a problem, capture the solution as searchable institutional documentation.

Usage

/phx:compound Fixed N+1 query in user listing
/phx:compound Resolved LiveView timeout in dashboard
/phx:compound   # Auto-detects from recent session context

Philosophy

Each unit of engineering work should make subsequent units easier — not harder.

Workflow

Step 1: Detect Context

1. If

   $ARGUMENTS

   provided, use as description
2. If no args, check scratchpad DEAD-END/DECISION entries,

   git diff

   ,

   .claude/plans/{slug}/progress.md

   for recent completions
3. If unclear, ask: "What problem did you just solve?"

Only document non-trivial problems that required investigation.

Step 2: Search Existing Solutions

Create

.claude/solutions/

directory if it doesn't exist (run

mkdir -p .claude/solutions

). Then search

.claude/solutions/

for relevant keywords using Grep.

If found: Create new (different root cause), Update existing (same root cause, new symptom), or Skip.

Step 3: Gather Details and Create Solution

Extract from session context: module, symptoms, investigation steps, root cause, solution code, and prevention advice.

Validate frontmatter against

compound-docs/references/schema.md

, then create file using

compound-docs/references/resolution-template.md

.

Step 4: Decision Menu

1. Continue (default)
2. Promote to Iron Law check — Add to iron-law-judge
3. Update skill reference — Add to relevant skill
4. Update CLAUDE.md — Add prevention rule

Auto-Trigger Phrases

When user says "that worked", "it's fixed", "problem solved", "the fix was" — suggest

/phx:compound

.

Iron Laws

1. YAML frontmatter validates or STOP
2. Symptoms must be specific — not "it broke"
3. Root cause is WHY, not WHAT
4. One problem per file
5. NEVER document a fix before verifying it works — run

   mix compile && mix test

   first; unverified solutions poison the knowledge base

Integration with Workflow

/phx:review → Complete → /phx:compound  ← YOU ARE HERE
                              │
                 .claude/solutions/{category}/{fix}.md
                              │
              /phx:investigate and /phx:plan search here

References

• ${CLAUDE_SKILL_DIR}/references/compound-workflow.md

  — Detailed step-by-step
• See also:

  compound-docs

  skill for schema and templates