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Description

## Overview
Define clear guidelines for when functionality should be a built-in tool vs a marketplace app.

## Built-in Tools Criteria
Tools should be built-in when they are:
1. **Fundamental primitives** - Basic building blocks (shell, HTTP, email)
2. **No business logic variation** - Standard interface, no customization needed
3. **Security-sensitive** - Need tight platform integration (secrets, code execution)
4. **Workflow control** - Core engine features (wait, parallel, approval)

## Marketplace Apps Criteria
Apps should be in marketplace when they:
1. **Have business logic** - Domain-specific behavior (payment processing, CRM)
2. **Vendor-specific** - Tied to specific service (Stripe, Salesforce, AWS)
3. **Complex configuration** - Need extensive setup per tenant
4. **Evolve independently** - Frequent updates separate from engine

## Current Classification

### Built-in Tools (keep as-is):
- tools.shell.* - Fundamental primitive
- tools.http.request - Fundamental primitive
- tools.email.send - Fundamental communication
- tools.llm.call - AI primitive
- tools.approval.request - Workflow control
- tools.secrets.* - Security
- tools.docker.* - Infrastructure primitive
- tools.workflow.* - Engine feature
- tools.code.exec - Security-sensitive

### Should Add as Built-in:
- tools.sms.send - Fundamental communication (like email)
- tools.webhook.register - Workflow control

### Should be Apps (marketplace):
- Payment gateways (Stripe, PayPal)
- Cloud providers (AWS, GCP, Azure)
- CRM systems (Salesforce, HubSpot)
- Document services (DocuSign, PDF generation)
- IoT platforms (AWS IoT, Azure IoT)
- Video processing (cloud transcoding services)
- Identity verification (Onfido, Jumio)

## Implementation Notes
- Built-in tools: Part of engine, tenant-agnostic
- Apps: Installed per-tenant, own versioning, own secrets

Due Date (YYYY-MM-DD)

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Edit Issue #352