Extend

Build custom capabilities that integrate cleanly with the ALIVE Context System.

Not about adjusting preferences or voice (that's alive:settings). Extend is about creating NEW things — skills, rules, hooks — that make the system do something it couldn't before.

---

What It Builds

Type	What it is	Where it lives
Skill	Repeatable workflow with instructions	.alive/skills/{skill-name}/SKILL.md
Rule	Behavioral constraint or guide	.alive/rules/{rule-name}.md
Hook	Automated trigger on system events	.alive/hooks/ (scripts + hooks.json)
Plugin	Distributable package of skills + rules + hooks	Hands off to contributor@alivecontext

---

Flow

1. Understand What the Human Wants

"I want to automatically tag emails by walnut" "Every time I save, it should update my project board" "I keep doing this manually every session — can we automate it?"

The squirrel determines: is this a skill (process), a rule (constraint), a hook (automation), or a combination?

╭─ squirrel that sounds like a hook — an automated trigger that fires on save.
│  Want me to build it?
│
│  It would:
│  - Fire after every alive:save
│  - Read the routed stash items
│  - Update your project board via API
│
│  > Build it / Tell me more / Not now
╰─

2. Check Compatibility

Before writing anything:

• Read the current plugin version from plugin.json
• Check which hook events are available (SessionStart, PreToolUse, PostToolUse, PreCompact, UserPromptSubmit)
• Verify the name doesn't collide with existing skills, rules, or hooks
• Check for rule contradictions with existing rules

3. Write to the Human's Space

NEVER write to the plugin cache. Plugin cache (~/.claude/plugins/) gets overwritten on update. Custom capabilities live in the human's own space:

• Custom skills: $WORLD_ROOT/.alive/skills/{skill-name}/SKILL.md
• Custom rules: $WORLD_ROOT/.alive/rules/{rule-name}.md
• Custom hooks: $WORLD_ROOT/.alive/hooks/ (scripts + .claude/hooks.json additions)

These persist across plugin updates. They're the human's own.

Create directories first — they may not exist yet:

mkdir -p "$WORLD_ROOT/.alive/skills/{skill-name}"   # for skills
mkdir -p "$WORLD_ROOT/.alive/rules"                  # for rules
mkdir -p "$WORLD_ROOT/.alive/hooks"                  # for hooks

3.5. Symlink for Discovery

Claude Code only discovers skills in ~/.claude/skills/. After writing a custom skill to .alive/skills/, always create the symlink:

mkdir -p ~/.claude/skills/{skill-name}
ln -sf "$WORLD_ROOT/.alive/skills/{skill-name}/SKILL.md" "$HOME/.claude/skills/{skill-name}/SKILL.md"

The session-new hook auto-syncs these on every startup, but creating the symlink immediately means the skill is available in the current session without restart.

This is mandatory. A skill without its symlink is invisible to Claude Code.

4. Validate

After writing:

• Test the skill/rule/hook runs without errors
• Verify it doesn't conflict with existing system behavior
• Confirm it loads on next session start

5. Confirm

╭─ squirrel built: auto-tag-emails
│
│  Type: hook (PostToolUse)
│  Location: .alive/hooks/auto-tag-emails.sh
│  Fires: after every email capture via alive:capture-context
│  Does: reads email sender, matches against person walnuts, tags accordingly
│
│  Test it now?
╰─

---

Custom Skill Structure

A custom skill follows the same format as core skills:

.alive/skills/{skill-name}/
  SKILL.md          # Instructions (same format as plugin skills)
  heavy-revive.md   # Optional sub-docs loaded on demand
  templates/        # Optional templates used by the skill

The SKILL.md frontmatter:

---
name: {skill-name}
description: "What this skill does — one sentence"
user-invocable: true
---

Custom Rule Structure

---
type: rule
name: {rule-name}
version: 1.0
scope: world | walnut:{name} | session
---

# {Rule Name}

[What this rule constrains or guides, when it applies, what behavior it enforces]

Custom Hook Structure

Hook scripts in .alive/hooks/ with corresponding entries in .claude/hooks.json:

{
  "hooks": [
    {
      "type": "PostToolUse",
      "matcher": "Write|Edit",
      "command": ".alive/hooks/my-custom-hook.sh"
    }
  ]
}

---

Marketplace Awareness

When a custom skill is polished and battle-tested:

╭─ squirrel this skill could work for other builders
│  Want to package it for the marketplace?
│
│  > Next step?
│  1. Package for marketplace (needs contributor plugin)
│  2. Keep it personal
│  3. Tell me more about the marketplace
╰─

Contributor plugin handoff: For marketplace packaging, PII stripping, testing, and publishing -> suggest installing contributor@alivecontext. This is a SEPARATE plugin, not part of the alive core. The extend skill's job ends at building working custom capabilities. The contributor plugin handles everything from packaging to publishing.

╭─ squirrel to publish this skill:
│
│  1. Install the contributor plugin:
│     claude plugin install contributor@alivecontext
│
│  2. Run: alive:contribute {skill-name}
│     It handles: PII check, packaging, testing, submission
│
│  > Install contributor plugin now?
╰─

---

What Extend Is NOT

• Not alive:settings — tune adjusts preferences and config. Extend creates new capabilities.
• Not a code editor — extend builds Alive-native skills/rules/hooks. For general coding, just code.
• Not the marketplace — extend builds. The contributor plugin publishes.

Tune adjusts the dials. Extend adds new dials.