Predicate Snapshot Engine

Replaces default browser snapshots with Predicate's ML-ranked DOM elements.

Reduces prompt token usage by 95% while preserving actionable elements.

Why Use This?

Result: Faster LLM inference, lower costs, fewer retries.

Requirements

• Node.js 18+
• PREDICATE_API_KEY environment variable (optional)

Without API key: Local heuristic-based pruning (~80% token reduction)

With API key: ML-powered ranking for cleaner output (~95% token reduction, less noise)

Get your free API key at predicate.systems/keys

Installation

npx clawdhub@latest install predicate-snapshot

Or manually:

git clone https://github.com/predicate-systems/predicate-snapshot-skill ~/.openclaw/skills/predicate-snapshot
cd ~/.openclaw/skills/predicate-snapshot && npm install && npm run build

Configuration

For enhanced ML-powered ranking, set your API key:

export PREDICATE_API_KEY="sk-..."

Or configure in ~/.openclaw/config.yaml:

skills:
  predicate-snapshot:
    api_key: "sk-..."
    # Optional: set usage limits
    max_credits_per_session: 100

Usage

/predicate-snapshot

Capture a pruned DOM snapshot optimized for LLM consumption.

/predicate-snapshot [--limit=50] [--include-ordinal]

Options:

• --limit=N - Maximum elements to return (default: 50)
• --include-ordinal - Include ordinal ranking for list items

Output format:

ID|role|text|imp|is_primary|docYq|ord|DG|href
42|button|Add to Cart|0.95|true|320|1|cart-actions|
15|button|Buy Now|0.92|true|340|2|cart-actions|
23|link|Product Details|0.78|false|400|0||/dp/...

/predicate-act

Execute an action on an element by its Predicate ID.

/predicate-act <action> <element_id> [value]

Examples:

# Click element 42
/predicate-act click 42

# Type into element 15
/predicate-act type 15 "search query"

# Scroll to element 23
/predicate-act scroll 23

/predicate-snapshot-local

Local-only snapshot without ML re-ranking (free, lower accuracy).

/predicate-snapshot-local [--limit=50]

Use this for development or when you don't need ML-powered ranking.

Example Workflow

1. Navigate to page
2. /predicate-snapshot          # Get ranked elements
3. /predicate-act click 42      # Click "Add to Cart" (element 42)
4. /predicate-snapshot          # Refresh snapshot
5. Verify cart updated

Pricing

Each snapshot consumes 1 credit. Local snapshots are free.

Comparison: Before & After

Before (Accessibility Tree):

@e1 navigation "Skip to main content"
@e2 link "Amazon"
@e3 search "Search Amazon"
... (800+ elements)
@e742 button "Add to Cart"  <-- buried in noise
... (more elements)

After (Predicate Snapshot):

ID|role|text|imp|is_primary|docYq|ord|DG|href
42|button|Add to Cart|0.98|true|520|1|cart-actions|  <-- ranked #1
15|button|Buy Now|0.95|true|540|2|cart-actions|
23|link|See All Buying...|0.72|false|560|3|cart-actions|

Support

• Documentation: predicatesystems.ai/docs
• Issues: GitHub Issues
• Discord: Predicate Community