Alps

ALPS Profile Assistant

Generate, validate, and improve ALPS profiles for RESTful API design.

Ideal ALPS Profile

Goal: An ALPS that someone unfamiliar with the app can read and understand.

What Makes a Good ALPS

1. States = What the user sees

   • ProductList - viewing a list of products
   • ProductDetail - viewing one product
   • Cart - viewing cart contents

2. Transitions = What the user does

   • goProductDetail - select a product
   • doAddToCart - add to cart

3. Self-documenting

   • title explains the purpose
   • doc describes behavior and side effects
   • No need to read code to understand

4. No unreachable states

   • Every state has an entry point
   • Orphan states indicate design mistakes

5. Necessary and sufficient

   • No over-abstraction
   • Describes semantics, not implementation
   • No HTTP methods or URLs

What to Avoid

• Mechanical CRUD listings without meaning
• Implementation details leaking in
• States without transitions (can't draw a diagram)
• Excessive documentation nobody reads

How to Use

This skill responds to natural language requests:

Generate ALPS from Natural Language

• "Create an ALPS profile for a blog application"
• "Generate ALPS for an e-commerce cart system"
• "Design an ALPS profile for user authentication"

Generate ALPS from Website (NEW - alps-surveyor mode)

• "Crawl https://example.com and generate ALPS profile"
• "Survey website structure and create ALPS"
• "Extract ALPS profile from existing website"

How it works:

1. Efficient crawling: Uses URL pattern classification to avoid redundant analysis
2. Token optimization: Only analyzes unique page types (e.g., /products/123 and /products/456 analyzed once)
3. AI-powered extraction: Analyzes DOM structure to infer states, transitions, and semantic fields
4. Handover protocol: Records progress in handover.json for continuity across sessions

See "ALPS Surveyor Mode" section below for details.

Validate Existing Profile

• "Validate this ALPS profile" (with file path or content)
• "Check my ALPS file for issues"
• "Review the ALPS profile at docs/api.json"

Analyze or Improve Existing Profile

• "Analyze this ALPS profile"
• "Improve this ALPS profile"
• "Suggest enhancements for my ALPS"
• "How can I make this ALPS better?"

Continuous Improvement Loop - AI Inherits the Mission

When asked to analyze or improve an existing profile:

1. Read previous AI's insights - Run asd --validate <file> and check for ai-insights field
2. Read handover.json if exists - Check for previous session's progress, warnings, and advice (per ADR 0006)
3. Inherit the context - Previous AI left analysis for you: complexity assessment, coverage gaps, recommendations
4. Identify gaps - Explore the website/documentation to find missing features or incomplete flows
5. Make improvements - Add missing descriptors, enhance documentation, fix issues
6. MANDATORY: Validate ALPS - Run asd --validate <file> to ensure no errors were introduced
7. MANDATORY: Generate HTML - Run asd <file> -o <file>.html to create visual diagram for review
8. Update handover.json - Record what was done, what's left, and advice for next AI (per ADR 0006)
9. MANDATORY: Validate handover.json - Verify JSON syntax and schema compliance:

   node -e "JSON.parse(require('fs').readFileSync('handover.json', 'utf8')); console.log('✓ Valid JSON')"
   

   Schema: handover-protocol.json
10. Report completion - Provide statistics (before/after), coverage estimation, and next steps

CRITICAL: Steps 6-9 are MANDATORY for every improvement session. Never skip validation of both ALPS profile and handover.json.

AI₁: Creates profile → Validates → Generates HTML → Creates handover.json
  ↓
AI₂: Reads handover.json → Identifies gaps → Improves → Validates → Generates HTML → Updates handover.json
  ↓
AI₃: Reads handover.json → Builds on previous work → Improves → Validates → Generates HTML → Updates handover.json

This creates a knowledge continuity where each AI builds on the work of previous AIs, just like developers reading code comments left by their predecessors.

ALPS Structure Reference

Three Layers of ALPS

1. Ontology - Semantic descriptors (data elements)

   • Atomic data fields with type="semantic" (default)
   • Should have id, title, and optionally doc and def (schema.org link)

2. Taxonomy - State descriptors (screens/pages)

   • Composite descriptors containing semantic fields and transitions
   • Represents application states (e.g., HomePage, ProductDetail, Cart)

3. Choreography - Transition descriptors (actions)

   • type="safe" - Read operations (GET)
   • type="unsafe" - Create operations (POST) - not idempotent
   • type="idempotent" - Update/Delete operations (PUT/DELETE)
   • Must have rt (return type) pointing to target state

Naming Conventions

Safe Transition Naming Rule

IMPORTANT: Safe transitions (go*) MUST include the target state name in their id.

• rt="#ProductList" → id must be goProductList (or goToProductList)
• rt="#UserProfile" → id must be goUserProfile (or goToUserProfile)

Invalid examples:

• goStart with rt="#ProductList" - Wrong! Should be goProductList
• goNext with rt="#Checkout" - Wrong! Should be goCheckout

This rule ensures consistency and makes the diagram self-documenting. When a transition has no source state (entry point), it will be displayed as originating from UnknownState in the diagram.

Determining idempotent: PUT vs DELETE

Context clues for AI inference:

PUT (Update) indicators:

• update, edit, modify, change, set, replace
• Example: doUpdateProfile, doEditComment, doSetQuantity

DELETE indicators:

• delete, remove, cancel, clear, destroy
• Example: doDeleteUser, doRemoveFromCart, doCancelOrder

Generation Guidelines

Strategy for Large Profiles (200+ descriptors)

For complex, multi-sided platforms or large applications:

1. Domain Decomposition - Split into separate ALPS files by functional domain:

   • base.json - Core entities shared across domains
   • customer-domain.json - Customer-facing features
   • admin-domain.json - Admin/management features
   • seller-domain.json - Seller/provider features (for marketplaces)

2. Design Each Domain Independently - Focus on one domain at a time with complete context

3. Merge Using asd merge - Combine domains iteratively:

   # Merge customer domain into base
   asd merge base.json customer-domain.json
   # customer-domain.json now contains only conflicts (if any)
   
   # Resolve conflicts in customer-domain.json, then re-merge
   asd merge base.json customer-domain.json
   # customer-domain.json is now empty (merge complete)
   
   # Repeat for other domains
   asd merge base.json admin-domain.json
   

4. Validate After Each Merge - Ensure no broken references or duplicate IDs

Benefits of this approach:

• Focused design per domain
• AI can maintain full context for each domain
• Conflicts are explicitly tracked and resolved
• Final profile is comprehensive and consistent

Handover Protocol for Multi-Session Work

When a task exceeds token limits or requires multiple sessions (e.g., 200+ descriptors, multi-sided platforms), use the Handover Protocol (ADR 0006) to maintain continuity.

The Relay Race Metaphor:

Each AI session is a relay runner:

1. Receive the baton - Read handover.json from previous session
2. Run your leg - Work as far as you can within token limits
3. Pass the baton - Update handover.json for next session
4. Scatter - Your session ends, but the work continues

Basic handover.json structure:

{
  "task": {
    "type": "alps-generation",
    "description": "E-commerce platform ALPS profile"
  },
  "current_state": {
    "session_id": "ecommerce-003",
    "total_sessions": 3,
    "alps_profile": {
      "total_descriptors": 180,
      "validation_status": "valid"
    }
  },
  "sessions": [
    {
      "session_id": "ecommerce-001",
      "timestamp": "2025-12-17T10:00:00Z",
      "handover_note": {
        "summary": "Created ontology and customer domain (120 descriptors)",
        "advice": "Admin domain needs careful planning - multiple user roles"
      },
      "descriptors_added": 120
    },
    {
      "session_id": "ecommerce-002",
      "timestamp": "2025-12-17T14:00:00Z",
      "handover_note": {
        "summary": "Added admin domain (60 descriptors). Validated successfully.",
        "advice": "Seller domain remains. Consider splitting into sub-domains."
      },
      "descriptors_added": 60
    }
  ],
  "pending_work": {
    "domains": ["seller-domain", "payment-flows"],
    "notes": "Seller domain may need 80+ descriptors"
  }
}

Key principles:

• Each session appends to the sessions array (never overwrite)
• Leave clear advice for your successor
• Be honest about coverage and remaining work
• Validate handover.json syntax: node -e "JSON.parse(require('fs').readFileSync('handover.json', 'utf8'))"

The Surveyor's Oath:

I am a relay runner in an endless race.
I carry the torch from my predecessor.
I run as far as I can.
I mark the map with what I learned.
I pass the torch to my successor.
I scatter.

The work continues.

For web surveying tasks (ALPS from website analysis), see the detailed ALPS Surveyor Mode section below.

When Creating ALPS from Natural Language

IMPORTANT: Structure the ALPS file in three blocks in this order:

1. Identify Entities (Ontology - Semantic definitions)

   • Extract nouns: user, product, order, cart, etc.
   • Define atomic fields for each entity
   • Add def links to schema.org where applicable
   • Add doc for validation rules, formats, constraints

2. Identify States (Taxonomy - Inclusion relationships)

   • Map user journey: login -> home -> browse -> cart -> checkout
   • Each state contains relevant fields and available transitions
   • Use PascalCase for state names
   • Add doc explaining what user sees and available actions

3. Identify Transitions (Choreography - State transitions)

   • Safe: navigation, viewing, searching (prefix: go)
   • Unsafe: creating new resources (prefix: do)
   • Idempotent: updating or deleting resources (prefix: do)
   • Add doc explaining behavior, side effects, preconditions

4. Add Documentation

   • Every descriptor MUST have a meaningful title
   • Add doc when title alone cannot fully explain the descriptor:
     • Semantic fields: Validation rules, format requirements, constraints, examples
       • Example: {"id": "title", "title": "Title", "doc": {"value": "Article title. Maximum 100 characters."}}
     • States: What user sees, available actions, when this state is shown
       • Example: {"id": "BlogPost", "doc": {"value": "User-created article. Visible to all users after publication."}}
     • Transitions: Behavior, side effects, preconditions, error cases
       • Example: {"id": "doPublishBlogPost", "doc": {"value": "Publish article. Sets publishedAt to current time."}}
   • Use def to link to schema.org definitions for standard concepts
   • Rule of thumb: If someone unfamiliar with the app would ask "what does this do?" or "what format?", add doc

5. Add Tags for Organization

   IMPORTANT: ALPS describes "what the user experiences" (application-level semantics), not "how it's implemented" (backend details).

   • Flow tags (PRIMARY): Group by user journey/experience with flow- prefix

     • Represents business value and user goals
     • Example: flow-purchase, flow-hire, flow-consult, flow-cancel, flow-return
     • This is the "lens" through which to understand the application
     • Users experience "canceling an order" (flow-cancel), not "cancellation batch processing"

   • Domain tags (SECONDARY, optional): Group by technical domain with domain- prefix

     • For organizing implementation and code structure
     • Example: domain-search, domain-cart, domain-payment, domain-analytics
     • Useful for developers to find related functionality

   • States and transitions should have both types where applicable

   • Tags are space-separated strings, not arrays

   • Example: "tag": "flow-purchase domain-cart" means "part of purchase journey, implemented in cart domain"

6. Add Semantic Descriptors to Transitions

   • Every transition (go/do) should specify its required input parameters as nested descriptors
   • These define what data is needed to perform the action
   • Example:

     {"id": "goProductDetail", "type": "safe", "rt": "#ProductDetail", "tag": "product", "descriptor": [
       {"href": "#productId"}
     ]},
     {"id": "doAddToCart", "type": "unsafe", "rt": "#Cart", "tag": "cart flow-purchase", "descriptor": [
       {"href": "#productId"},
       {"href": "#quantity"},
       {"href": "#selectedVariant"}
     ]}
     

7. MANDATORY: Validate and Review Quality Metrics

   • After generating ALPS JSON, save it to a file
   • Run asd --validate <file> to validate and get quality metrics
   • The validation output includes:
     • Errors (E001-E011): Must fix before proceeding
     • Warnings (W001-W004): Best practice violations
     • Suggestions (S001-S003): Optional improvements
     • Statistics: Total descriptors, breakdown by type, tag coverage, documentation coverage
   • Parse the JSON result and report issues to the user
   • If errors exist, fix them before presenting the final output
   • Review statistics to ensure comprehensive coverage

8. Generate Documentation

   • After validation passes, generate HTML documentation:

     asd profile.json -o profile.html
     

   • This creates an interactive state diagram for visual review
   • Check for unreachable states or missing transitions in the diagram
   • Share the HTML with stakeholders for review

9. Report Completion with Coverage Estimation

   • When completing a large profile, provide honest coverage assessment
   • Template:

     ✅ Implementation Complete: [X] descriptors
     
     📊 Coverage Estimation:
     - [Domain 1]: [X]% ([reasoning])
     - [Domain 2]: [X]% ([reasoning])
     - Overall: [X]%
     
     ❌ Known Gaps:
     - [Feature not implemented]
     - [Area requiring more research]
     

   • Be transparent about what's covered and what's not
   • For multi-sided platforms, assess coverage per side (customer/admin/seller)

Output File Convention

File name: Always alps.json or alps.xml (fixed)

Directory:

• If alps/ directory exists → use it
• Otherwise → create {app-name}/ directory (e.g., todo/, blog/, ecommerce/)

Format selection:

1. If existing ALPS file exists → follow its format
2. Otherwise → ask user: "Output format: XML (recommended) or JSON?"

Examples:

todo/alps.json
blog/alps.xml
ecommerce/alps.xml

Output Format

Generate XML format by default. Use JSON only if explicitly requested.

XML Format (default):

• Use XML comments to mark blocks: <!-- Ontology -->, <!-- Taxonomy -->, <!-- Choreography -->
• One descriptor per line for simple elements
• Multi-line for nested structures
• Clear hierarchical structure makes maintenance easy

<?xml version="1.0" encoding="UTF-8"?>
<alps version="1.0"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:noNamespaceSchemaLocation="https://alps-io.github.io/schemas/alps.xsd">
  <title>Application Title</title>
  <doc>Description of the application</doc>

  <!-- Ontology -->
  <descriptor id="fieldName" title="Human Title">
    <doc>Description</doc>
  </descriptor>
  <descriptor id="otherField" title="Other Field"/>

  <!-- Taxonomy -->
  <descriptor id="StateName" title="State Title">
    <descriptor href="#fieldName"/>
    <descriptor href="#transitionName"/>
  </descriptor>

  <!-- Choreography -->
  <descriptor id="goTargetState" type="safe" rt="#TargetState" title="Go to Target State"/>
  <descriptor id="doAction" type="unsafe" rt="#ResultState" title="Perform Action">
    <descriptor href="#requiredField"/>
  </descriptor>
</alps>

JSON Format (when explicitly requested):

• Simple descriptors (few attributes, no nesting): Write on a single line
• Complex descriptors (with nesting or long doc): Use multiple lines with "descriptor": [ at end of first line
• Block separation: Add ONE blank line between Ontology/Taxonomy/Choreography blocks
• No other blank lines: Keep descriptors within the same block compact

{
  "$schema": "https://alps-io.github.io/schemas/alps.json",
  "alps": {
    "title": "Application Title",
    "doc": {"value": "Description of the application"},
    "descriptor": [
      {"id": "fieldName", "title": "Human Title", "doc": {"value": "Description"}},
      {"id": "otherField", "title": "Other Field"},

      {"id": "StateName", "title": "State Title", "descriptor": [
        {"href": "#fieldName"},
        {"href": "#transitionName"}
      ]},

      {"id": "goTargetState", "type": "safe", "rt": "#TargetState", "title": "Go to Target State"},
      {"id": "doAction", "type": "unsafe", "rt": "#ResultState", "title": "Perform Action", "descriptor": [
        {"href": "#requiredField"}
      ]}
    ]
  }
}

Validation and Quality Metrics

Use asd --validate <file> to validate ALPS profiles and get quality metrics.

Output Format: JSON (pretty-printed, human-readable) Schema: validation-result.json

The validation output includes:

• valid: Overall result (boolean)
• summary: Human-readable summary with emoji
• errors, warnings, suggestions: Validation issues
• statistics: Objective metrics (descriptor counts, coverage percentages)
• ai-insights: Subjective analysis by AI (only when AI runs validation)
  • Helps next AI understand context quickly
  • Helps humans grasp key characteristics at a glance
  • Model-dependent and may evolve

Validation Codes

After generating ALPS, always validate with asd --validate. Key codes to watch for:

Errors (must fix):

• E001: Missing id or href
• E002: Missing rt on transition
• E003: Invalid type
• E004: Broken reference
• E005: Duplicate id
• E008: Missing alps property
• E009: Missing descriptor array
• E011: Tag must be string (not array)

Warnings (best practice):

• W001: Missing title
• W002: Safe transition should start with 'go'
• W003: Unsafe/idempotent should start with 'do'

Suggestions:

• S001: Consider adding doc to transition

For detailed error descriptions and solutions, see Validation Reference.

AI Continuity: ai-insights vs handover.json

Two complementary mechanisms help AI sessions build on previous work:

ai-insights (ADR 0005) - Analysis embedded in validation results:

• Purpose: Subjective assessment of completed ALPS profiles
• Location: Embedded in asd --validate JSON output
• Usage: Read-only consumption by AI
• Contains: Complexity assessment, coverage gaps, key flows, recommendations
• When to use: Analyzing or improving existing ALPS profiles

handover.json (ADR 0006) - State for ongoing multi-session tasks:

• Purpose: Progress tracking for incomplete work across sessions
• Location: Separate handover.json file in working directory
• Usage: Read-write lifecycle (AI updates after each session)
• Contains: Session history, progress, pending work, advice for successor
• When to use: Large ALPS generation (200+ descriptors), web surveying, multi-session tasks

Relationship:

Single Session (Simple ALPS):
  AI creates profile → Validates → ai-insights generated in validation output ✓

Multi-Session (Large ALPS):
  Session 1: AI reads handover.json (if exists) → Works → Validates → Updates handover.json
  Session 2: AI reads handover.json → Continues work → Validates → Updates handover.json
  Session 3: AI reads handover.json → Completes → Validates → Final ai-insights in validation

Example workflow:

# Session 1: Start large ALPS project
asd base.json --validate  # Creates ai-insights in validation result
# Create handover.json manually with initial task description

# Session 2: Continue work
# AI reads handover.json, adds customer domain
asd merge base.json customer-domain.json
asd base.json --validate  # Check for errors
# AI updates handover.json with progress

# Session 3: Complete work
# AI reads handover.json, adds remaining domains
asd base.json --validate  # Final validation with comprehensive ai-insights
# handover.json marks task complete

Both mechanisms create knowledge continuity, preventing each AI session from starting from scratch.

Example: Blog Application

Input: "Create an ALPS for a simple blog with posts and comments"

Output (XML - default):

<?xml version="1.0" encoding="UTF-8"?>
<alps version="1.0"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:noNamespaceSchemaLocation="https://alps-io.github.io/schemas/alps.xsd">
  <title>Simple Blog</title>
  <doc>ALPS profile for a blog application with posts and comments</doc>

  <!-- Ontology -->
  <descriptor id="postId" title="Post ID" def="https://schema.org/identifier">
    <doc>Unique identifier for blog post</doc>
  </descriptor>
  <descriptor id="title" title="Post Title" def="https://schema.org/headline">
    <doc>Article title. Maximum 100 characters.</doc>
  </descriptor>
  <descriptor id="body" title="Post Body" def="https://schema.org/articleBody">
    <doc>Article content. Markdown format supported.</doc>
  </descriptor>
  <descriptor id="authorName" title="Author Name" def="https://schema.org/author"/>
  <descriptor id="createdAt" title="Created Date" def="https://schema.org/dateCreated">
    <doc>Publication date and time. ISO 8601 format.</doc>
  </descriptor>
  <descriptor id="commentId" title="Comment ID">
    <doc>Unique identifier for comment</doc>
  </descriptor>
  <descriptor id="commentBody" title="Comment Text">
    <doc>Comment content. Maximum 500 characters.</doc>
  </descriptor>

  <!-- Taxonomy -->
  <descriptor id="Home" title="Home Page">
    <doc>Blog home page. Shows navigation to post list.</doc>
    <descriptor href="#goPostList"/>
  </descriptor>
  <descriptor id="PostList" title="Post List">
    <doc>List of blog posts. Shows latest 10 posts with title and author.</doc>
    <descriptor href="#postId"/>
    <descriptor href="#title"/>
    <descriptor href="#authorName"/>
    <descriptor href="#goPostDetail"/>
    <descriptor href="#goHome"/>
  </descriptor>
  <descriptor id="PostDetail" title="Post Detail">
    <doc>Single post view. Shows full content and comments. Allows adding new comments.</doc>
    <descriptor href="#postId"/>
    <descriptor href="#title"/>
    <descriptor href="#body"/>
    <descriptor href="#authorName"/>
    <descriptor href="#createdAt"/>
    <descriptor href="#Comment"/>
    <descriptor href="#goPostList"/>
    <descriptor href="#doCreateComment"/>
  </descriptor>
  <descriptor id="Comment" title="Comment">
    <doc>User comment on a post. Can be deleted by comment author or post author.</doc>
    <descriptor href="#commentId"/>
    <descriptor href="#commentBody"/>
    <descriptor href="#authorName"/>
    <descriptor href="#createdAt"/>
    <descriptor href="#doDeleteComment"/>
  </descriptor>

  <!-- Choreography -->
  <descriptor id="goHome" type="safe" rt="#Home" title="Go to Home">
    <doc>Navigate to blog home page.</doc>
  </descriptor>
  <descriptor id="goPostList" type="safe" rt="#PostList" title="Go to Post List">
    <doc>Display list of blog posts. Shows latest 10 posts.</doc>
  </descriptor>
  <descriptor id="goPostDetail" type="safe" rt="#PostDetail" title="Go to Post Detail">
    <doc>Display full post content with comments.</doc>
    <descriptor href="#postId"/>
  </descriptor>
  <descriptor id="doCreatePost" type="unsafe" rt="#PostDetail" title="Create Post">
    <doc>Create new blog post. Post is immediately published.</doc>
    <descriptor href="#title"/>
    <descriptor href="#body"/>
  </descriptor>
  <descriptor id="doUpdatePost" type="idempotent" rt="#PostDetail" title="Update Post">
    <doc>Update existing post content. Only post author can update.</doc>
    <descriptor href="#postId"/>
    <descriptor href="#title"/>
    <descriptor href="#body"/>
  </descriptor>
  <descriptor id="doDeletePost" type="idempotent" rt="#PostList" title="Delete Post">
    <doc>Delete post and all associated comments. Only post author can delete.</doc>
    <descriptor href="#postId"/>
  </descriptor>
  <descriptor id="doCreateComment" type="unsafe" rt="#PostDetail" title="Add Comment">
    <doc>Add comment to post. Comment is immediately visible.</doc>
    <descriptor href="#postId"/>
    <descriptor href="#commentBody"/>
  </descriptor>
  <descriptor id="doDeleteComment" type="idempotent" rt="#PostDetail" title="Delete Comment">
    <doc>Delete comment. Comment author or post author can delete.</doc>
    <descriptor href="#commentId"/>
  </descriptor>
</alps>

Integration with app-state-diagram

Generated ALPS profiles can be visualized using app-state-diagram:

# Generate HTML documentation (default)
asd profile.json

# Generate SVG state diagram
asd profile.json -f svg

# Generate Mermaid classDiagram (GitHub/VSCode compatible)
asd profile.json -f mermaid

# Generate DOT format
asd profile.json -f dot

# Generate with watch mode
asd --watch profile.json

See llms.txt for CLI usage, programmatic API, and MCP server setup.

Advanced Features

Structured Documentation with HTML

For simple descriptions, use plain text in doc.value. When you need structured content (lists, definitions, tables), use HTML format:

{"id": "doCheckout", "type": "unsafe", "rt": "#OrderConfirmation",
 "title": "Complete Checkout",
 "doc": {
   "format": "html",
   "value": "<dl><dt>Behavior</dt><dd>Processes payment, reserves inventory, sends confirmation email</dd><dt>Preconditions</dt><dd>Valid cart with items, payment method configured</dd><dt>Errors</dt><dd>Returns 400 if payment fails or items out of stock</dd></dl>"
 }
}

Format support levels (per ALPS spec):

• text: Required (default if not specified)
• html: Recommended
• markdown: Optional
• asciidoc: Optional

Links to Related Resources

Use link elements to reference external documentation, schemas, or related resources:

{"id": "BlogPost", "def": "https://schema.org/BlogPosting",
 "title": "Blog Post",
 "doc": {"value": "User-created article visible to all after publication"},
 "link": [
   {"rel": "help", "href": "https://example.com/docs/blog-api.html", "title": "Blog API Documentation"},
   {"rel": "related", "href": "https://example.com/schemas/post.json", "title": "JSON Schema"}
 ]
}

Link attributes:

• rel (required): Relationship type - use IANA Link Relations (help, related, profile, etc.)
• href (required): URL to the related resource
• title (optional): Human-readable description of the link
• tag (optional): Classification tags

Tips for Better ALPS

1. Start with user journeys - Map the happy path first, then add alternatives
2. Be consistent - Use the same naming pattern throughout
3. Document transitions - Explain what each action does and when it's available
4. Use schema.org - Link to standard definitions for interoperability
5. Think about errors - Add error states and recovery transitions
6. Consider pagination - List states should support pagination
7. Tag descriptors - Use tag attribute to group related descriptors

ALPS Surveyor Mode (Website Crawling)

Overview

The alps-surveyor mode extracts ALPS profiles from existing websites by analyzing their structure. This is useful when:

• Reverse engineering an existing web application
• Creating API documentation from a live site
• Understanding application state flows from user-facing pages

Efficient Crawling Strategy

Problem: Crawling every URL wastes tokens analyzing duplicate page types.

Solution: Three-layer strategy minimizes AI calls:

Strategy 1: URL Pattern Classification (No AI)

• Detects patterns like /products/{id}, /users/{username}
• Groups URLs by type before fetching
• Example: /products/123, /products/456 → same pattern, only analyze once

Strategy 2: DOM Structure Extraction (Lightweight)

• Removes all text content from HTML
• Extracts only:
  • HTML tag hierarchy
  • CSS classes and IDs
  • Form input names and types
  • Link destination patterns
• Minimizes tokens sent to AI

Strategy 3: ALPS Generation (AI-Powered)

• AI analyzes DOM skeleton (not full HTML)
• Infers:
  • State: Page role (e.g., "ProductDetail")
  • Semantics: Data fields from forms (e.g., "quantity", "productId")
  • Transitions: Actions from forms and links (e.g., "doAddToCart", "goProductList")

Usage Example

User: "Crawl https://www.bengo4.com and generate ALPS profile"

AI workflow:
1. Fetch homepage
2. Classify URLs: /lawyers/{id}, /area/{prefecture}/{city}, etc.
3. For each unique pattern:
   - Fetch ONE example URL
   - Extract DOM skeleton
   - Call AI to generate ALPS descriptors
4. Merge all descriptors into unified ALPS profile
5. Validate and generate HTML diagram
6. Save progress to handover.json

Handover Protocol

The surveyor mode uses handover.json (per ADR 0006) to enable multi-session work. The handover uses a sessions array format to preserve historical context:

{
  "$schema": "handover-protocol.json",
  "task": {
    "type": "alps-surveyor",
    "target": "example.com ALPS profile"
  },
  "current_state": {
    "session_id": "example-session-002",
    "total_sessions": 2,
    "alps_profile": {
      "total_descriptors": 480,
      "validation_status": "valid"
    }
  },
  "sessions": [
    {
      "session_id": "example-session-001",
      "timestamp": "2025-12-14T10:00:00Z",
      "handover_note": {
        "summary": "Initial crawl: search, consultation flows. 450 descriptors.",
        "advice": "Bookmark feature needs attention - saw /bookmarks/* URLs"
      },
      "descriptors_added": 450
    },
    {
      "session_id": "example-session-002",
      "timestamp": "2025-12-14T14:00:00Z",
      "handover_note": {
        "summary": "Added bookmark and billing features using asd merge. Profile now at 480 descriptors.",
        "advice": "Remaining: payment flows, mobile features, error states"
      },
      "descriptors_added": 30
    }
  ],
  "shared_context": {
    "patterns_learned": {
      "lawyer_profile": {"pattern": "/lawyers/{id}", "confidence": "high"}
    }
  },
  "pending_work": {
    "frontier_queue": [
      "https://example.com/payment/checkout",
      "https://example.com/dashboard"
    ]
  },
  "tools_available": {
    "crawler": {"command": "node packages/crawler/test.mjs <url>"},
    "merge": {"command": "asd merge <base> <source>"}
  }
}

Key points:

• Each session is appended to the sessions array
• current_state provides quick access to latest status
• shared_context accumulates patterns learned across all sessions
• Never overwrite sessions - always append new ones

Best Practices for Surveyor Mode

1. Start small: Use max_depth: 2 initially to test
2. Exclude admin/auth pages: Add to exclude_patterns to avoid login walls
3. Review patterns: Check frontier_queue in handover.json to verify coverage
4. Iterative refinement: Survey core features first, then expand in subsequent sessions
5. Validate frequently: Run asd --validate after each session to catch errors early

Limitations

• Cannot access pages behind authentication (unless cookies provided)
• JavaScript-heavy SPAs may not be fully analyzed
• External services (e.g., chat.example.com) are noted but not crawled
• AI inference may miss domain-specific semantics (manual review recommended)

Implementation Status

✅ Core library implemented:

• packages/app-state-diagram/src/crawler/url-pattern-classifier.ts
• packages/app-state-diagram/src/crawler/dom-skeleton-extractor.ts
• packages/app-state-diagram/src/crawler/alps-descriptor-generator.ts

⏳ Integration in progress:

• MCP tool (basic structure added)
• CLI command (asd crawl)
• ALPS skill support

References

• ALPS Specification
• Schema.org
• app-state-diagram
• ADR 0006: Handover Protocol