Plugin Initialization

Install the Elixir/Phoenix plugin's behavioral instructions into the project's CLAUDE.md.

Usage

/phx:init           # First-time installation
/phx:init --update  # Update existing installation with latest rules

Workflow

Step 1: Check Existing CLAUDE.md

# Check if CLAUDE.md exists
ls -la CLAUDE.md 2>/dev/null

# Check for existing plugin installation
grep -q "ELIXIR-PHOENIX-PLUGIN:START" CLAUDE.md 2>/dev/null

Step 2: Detect Project Stack

Scan the project to customize the injected instructions:

# Phoenix version
grep -oP 'phoenix.*"~> \K[0-9.]+' mix.exs 2>/dev/null || echo "unknown"

# Ecto version
grep -oP 'ecto.*"~> \K[0-9.]+' mix.exs 2>/dev/null || echo "unknown"

# Oban detection
grep -q '"oban"' mix.exs && echo "oban"
grep -q '"oban_pro"' mix.exs && echo "oban_pro"

# Framework detection
grep -q '"ash"' mix.exs && echo "ash"
grep -q '"surface"' mix.exs && echo "surface"

# Tidewave detection
grep -q '"tidewave"' mix.exs && echo "tidewave"

# Project size
find lib -name "*.ex" 2>/dev/null | wc -l

Step 3: Handle Installation Modes

Mode A: Fresh Install (no CLAUDE.md or no markers)

1. Create/append to CLAUDE.md
2. Insert full behavioral instructions between markers
3. Include only relevant sections based on detected stack

Mode B: Update (--update flag or markers exist)

1. Find content between <!-- ELIXIR-PHOENIX-PLUGIN:START --> and <!-- ELIXIR-PHOENIX-PLUGIN:END -->
2. Replace with latest behavioral instructions
3. Preserve everything outside the markers

Step 4: Generate Content

Write the following structure to CLAUDE.md:

<!-- ELIXIR-PHOENIX-PLUGIN:START -->
<!-- Last updated: {date} | Plugin version: 1.0 | Stack: Phoenix {version}, Ecto {version}, {optional: Oban, Tidewave} -->

# Elixir/Phoenix Plugin - Auto-Activation Rules

{Include all sections from the Content Template below, filtered by detected stack}

<!-- ELIXIR-PHOENIX-PLUGIN:END -->

Step 5: Output Summary

✅ Elixir/Phoenix plugin initialized

Detected stack:
- Phoenix {version}
- Ecto {version}
- {Oban standard | Oban Pro | not detected}
- {Tidewave ✓ | Tidewave not detected}
- {Ash Framework detected - Ecto patterns disabled | not detected}

Added to CLAUDE.md:
- Auto-activation rules (complexity detection, interview mode)
- Agent trigger patterns ({n} agents available)
- Reference auto-loading ({n} reference docs)
- Iron Laws enforcement ({n} laws)
- Verification rules

Run /phx:init --update after plugin updates.
Run /phx:audit for a full project health check.

Content Template

The exact content to inject is in references/injectable-template.md.

Key structure:

1. 7-Step Mandatory Procedure — Claude Code MUST execute before every response
2. Iron Laws — STOP behavior on violations
3. Conditional Sections — Include based on detected stack:
   • {OBAN_SECTION} — If Oban detected (not Pro)
   • {OBAN_PRO_SECTION} — If Oban Pro detected
   • {ASH_SECTION} — If Ash Framework detected
   • {TIDEWAVE_SECTION} — If Tidewave detected
4. Verification — Mandatory after code changes
5. Quick Reference — Skill routing table

Placeholder substitution:

Placeholder	Source
{DATE}	Current date
{PHOENIX_VERSION}	From mix.exs
{ECTO_VERSION}	From mix.exs
{OPTIONAL_STACK}	Detected optional deps

See references/injectable-template.md for full template with all placeholders and conditional sections.

Validation

After running /phx:init:

1. Check CLAUDE.md contains markers
2. Verify detected stack matches actual project
3. New session should:
   • Auto-detect complexity when given tasks
   • Stop on Iron Law violations
   • Offer relevant workflows based on task

Error Handling

Scenario	Action
CLAUDE.md read-only	Error: "Cannot modify CLAUDE.md - check permissions"
Markers corrupted	Warn, offer to remove and reinstall
Unknown Phoenix version	Use conservative defaults (all features enabled)
Not an Elixir project	Error: "No mix.exs found - is this an Elixir project?"

Relationship to Other Commands

Command	When to Use
/phx:init	First time, or after plugin updates
/phx:audit	Periodic project health check
/phx:verify	After code changes