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cascadeflow Architecture & Code Structure

This document explains the architecture and organization of cascadeflow to help contributors quickly understand and navigate the codebase.

Table of Contents

  1. Quick Overview
  2. Directory Structure
  3. Core Components
  4. Data Flow
  5. Key Design Patterns
  6. Module Guide
  7. Common Tasks

Quick Overview

cascadeflow reduces LLM API costs by 40-85% through speculative execution:

  1. Try cheap model first (draft)
  2. Validate quality
  3. Escalate to expensive model only if needed (verifier)

Result: 70-80% of queries accept the draft, avoiding expensive model calls entirely.

Directory Structure

cascadeflow is a monorepo with both Python and TypeScript/JavaScript libraries:

cascadeflow/                  # Monorepo root
│
├── 📦 packages/              TypeScript/JavaScript Packages
│   └── core/                 @cascadeflow/core (TypeScript library)
│       ├── src/              TypeScript source
│       ├── dist/             Compiled JavaScript
│       ├── tests/            TypeScript tests
│       └── package.json      Package configuration
│
├── 📄 Monorepo Config
│   ├── package.json          Root package.json (pnpm workspace)
│   ├── pnpm-workspace.yaml   Workspace configuration
│   └── turbo.json            Turborepo build pipeline
│
├── 🐍 Python Library
│   └── cascadeflow/          Python package (production-ready)
│       │
│       ├── 📄 Root-Level Files (Main Entry Point)
│       │   ├── agent.py              Main CascadeAgent orchestrator
│       │   └── __init__.py           Public API exports + backward compatibility
│       │
│       ├── 📁 schema/                Data Structures & Configuration
│   ├── __init__.py           Schema module exports
│   ├── config.py             ModelConfig, CascadeConfig, UserTier, etc.
│   ├── result.py             CascadeResult dataclass
│   └── exceptions.py         Custom exception hierarchy
│
├── 📁 core/                  Core Execution Engine
│   ├── __init__.py           Core module exports
│   ├── cascade.py            Speculative cascade implementation (was speculative.py)
│   └── execution.py          Domain detection & execution planning
│
├── 📁 providers/             LLM Provider Implementations
│   ├── base.py               BaseProvider interface
│   ├── openai.py             OpenAI provider (GPT-4, GPT-3.5)
│   ├── anthropic.py          Anthropic provider (Claude)
│   ├── groq.py               Groq provider (Llama, Mixtral)
│   ├── ollama.py             Ollama provider (local models)
│   ├── vllm.py               vLLM provider (self-hosted)
│   ├── huggingface.py        HuggingFace Inference API
│   └── together.py           Together AI provider
│
├── 📁 quality/               Quality Validation System
│   ├── quality.py            QualityValidator, QualityConfig
│   ├── confidence.py         Confidence scoring
│   ├── alignment_scorer.py   Query-response alignment
│   ├── complexity.py         ComplexityDetector (5-level analysis)
│   ├── query_difficulty.py   Query difficulty estimation
│   └── tool_validator.py     Tool call validation
│
├── 📁 routing/               Routing & Decision Logic
│   ├── base.py               Base router interface
│   ├── router.py             Main router implementation
│   ├── pre_router.py         Complexity-based routing (text queries)
│   ├── tool_router.py        Capability filtering (tools)
│   ├── complexity_router.py  Tool-specific complexity routing
│   └── tool_complexity.py    Tool complexity analysis
│
├── 📁 streaming/             Streaming Response Handling
│   ├── base.py               StreamManager (text-only streaming)
│   ├── tools.py              ToolStreamManager (tool call streaming)
│   └── utils.py              Streaming utilities
│
├── 📁 telemetry/             Metrics, Cost Tracking & Monitoring
│   ├── cost_calculator.py    CostCalculator (v2.5+ single source of truth)
│   ├── collector.py          MetricsCollector (statistics aggregation)
│   ├── cost_tracker.py       CostTracker (historical tracking)
│   └── callbacks.py          CallbackManager (event-based monitoring)
│
├── 📁 tools/                 Tool Calling Framework
│   ├── call.py               Tool call handling
│   ├── config.py             Tool configuration
│   ├── executor.py           Tool execution
│   ├── formats.py            Tool format conversion
│   ├── result.py             Tool result dataclass
│   └── examples.py           Example tool definitions
│
├── 📁 utils/                 Helper Utilities
│   ├── helpers.py            Logging, formatting, token estimation
│   ├── caching.py            Response caching (ResponseCache)
│   └── presets.py            Smart presets (CascadePresets)
│
       └── 📁 interface/             Visual Feedback & UI
           └── visual_consumer.py    Terminal visual indicators (pulsing dots)
│
├── 📁 tests/                 Python Tests
│   ├── test_agent.py         Agent integration tests
│   ├── test_providers/       Provider-specific tests
│   └── ...                   Other test files
│
├── 📁 examples/              Usage Examples
│   ├── basic_usage.py        Python examples
│   └── ...                   More examples
│
└── 📁 docs/                  Documentation
    └── guides/               User guides

Core Components

TypeScript/JavaScript Library (packages/core/)

Purpose: Bring cascadeflow's cost-saving cascade logic to the JavaScript/TypeScript ecosystem

Current Status: MVP (OpenAI provider only)

Key Files:

  • src/agent.ts - CascadeAgent (main orchestrator)
  • src/providers/openai.ts - OpenAI provider with GPT-5 support
  • src/providers/base.ts - Base provider interface
  • src/config.ts - Configuration interfaces
  • src/result.ts - CascadeResult interface
  • src/types.ts - Core type definitions
  • src/index.ts - Public API exports

Usage:

import { CascadeAgent } from '@cascadeflow/core';

const agent = new CascadeAgent({
  models: [
    { name: 'gpt-4o-mini', provider: 'openai', cost: 0.00015, apiKey: '...' },
    { name: 'gpt-4o', provider: 'openai', cost: 0.00625, apiKey: '...' }
  ]
});

const result = await agent.run('What is TypeScript?');
console.log(`Savings: ${result.savingsPercentage}%`);

Build System:

  • Package Manager: pnpm (workspaces)
  • Build Tool: tsup (fast, zero-config)
  • Monorepo: Turborepo (efficient caching)
  • Bundle Size: ~48KB (minified)

Supported Environments:

  • Node.js 18+ ✅
  • Browser (with API proxy) ✅

When to modify:

  • Adding TypeScript/JavaScript specific features
  • Adding new providers to TypeScript library
  • Improving TypeScript types

Location: packages/core/

Core Components (Python)

1. CascadeAgent (agent.py)

Purpose: Main orchestrator - entry point for all queries

Key Methods:

  • run(query) - Execute query with cascading
  • run_streaming(query) - Execute with streaming
  • stream_events(query) - Low-level streaming API

Responsibilities:

  • Coordinate all components
  • Route to appropriate execution strategy
  • Calculate final costs via CostCalculator
  • Manage metrics collection
  • Handle callbacks

When to modify: Adding new top-level features, changing orchestration logic

Location: cascadeflow/agent.py

2. WholeResponseCascade (core/cascade.py)

Purpose: Core cascade execution engine (the innovation!)

Key Method:

  • execute(query, drafter, verifier) - Run speculative cascade

How it works:

# 1. Generate draft response (cheap model)
draft_response = await drafter.complete(query)

# 2. Validate quality
validation = quality_validator.validate(draft_response, query)

# 3. Decide: accept draft or escalate
if validation.passed:
    return draft_response  # ✅ 70% of queries stop here!
else:
    return await verifier.complete(query)  # ❌ Escalate to expensive model

When to modify: Changing cascade logic, quality validation integration, cost calculation

Location: cascadeflow/core/cascade.py (was speculative.py)

3. ComplexityDetector (quality/complexity.py)

Purpose: Analyze query complexity (5 levels: trivial, simple, moderate, hard, expert)

Key Method:

  • detect(query) → QueryComplexity

Used by: PreRouter to decide direct vs cascade routing

When to modify: Improving complexity detection heuristics

Location: cascadeflow/quality/complexity.py

4. QualityValidator (quality/quality.py)

Purpose: Multi-dimensional response quality validation

Checks:

  • Confidence score (via logprobs)
  • Query-response alignment
  • Response coherence
  • Query difficulty vs model capability

Key Method:

  • validate(response, query, model) → ValidationResult

When to modify: Adding new quality dimensions, tuning thresholds

Location: cascadeflow/quality/quality.py

5. ModelConfig (schema/config.py)

Purpose: Configuration dataclass for individual models

Key Fields:

@dataclass
class ModelConfig:
    name: str                    # Model name (e.g., "gpt-4o")
    provider: str                # Provider (e.g., "openai")
    cost: float                  # Cost per 1K tokens
    speed_ms: Optional[int]      # Expected latency
    quality_score: float         # Quality rating (0.0-1.0)
    domains: List[str]           # Specialized domains
    supports_tools: bool         # Tool calling support

When to modify: Adding new configuration options for models

Location: cascadeflow/schema/config.py

6. CascadeResult (schema/result.py)

Purpose: Comprehensive result object with 30+ diagnostic fields

Key Fields:

@dataclass
class CascadeResult:
    # Core (9 fields)
    content: str
    model_used: str
    total_cost: float
    latency_ms: float
    complexity: str
    cascaded: bool
    draft_accepted: bool
    routing_strategy: str
    reason: str

    # Quality diagnostics (4 fields)
    # Timing breakdown (5 fields)
    # Cost breakdown (3 fields)
    # Tool calling (2 fields)
    # ... 30+ total fields

When to modify: Adding new diagnostic fields for results

Location: cascadeflow/schema/result.py

7. BaseProvider (providers/base.py)

Purpose: Abstract interface for all LLM providers

Key Methods:

  • complete(messages, max_tokens, temperature) → ModelResponse
  • stream(messages) → AsyncIterator[str]
  • complete_with_tools(messages, tools) → ModelResponse

When to modify: Adding new provider, changing provider contract

Location: cascadeflow/providers/base.py

8. PreRouter (routing/pre_router.py)

Purpose: Decide whether to cascade or route directly based on complexity

Decision Logic:

Trivial/Simple query    → Direct to cheap model (no cascade)
Moderate query          → Cascade (draft → quality check → maybe verifier)
Hard/Expert query       → Direct to best model (skip draft)

When to modify: Changing routing heuristics, adding new routing strategies

Location: cascadeflow/routing/pre_router.py

9. CostCalculator (telemetry/cost_calculator.py)

Purpose: Single source of truth for cost calculations (v2.5+)

Key Method:

  • calculate(spec_result) → CostBreakdown

Calculates:

  • draft_cost - Cost of draft model
  • verifier_cost - Cost of verifier model (if called)
  • total_cost - Properly aggregated total
  • cost_saved - Savings vs using best model only

When to modify: Changing cost calculation logic, adding new cost metrics

Location: cascadeflow/telemetry/cost_calculator.py

Data Flow

High-Level Flow

User Query (str)
    ↓
CascadeAgent.run()
    ↓
PreRouter (decide: cascade vs direct?)
    ↓
WholeResponseCascade.execute()
    ↓
Drafter.complete() → ModelResponse
    ↓
QualityValidator.validate() → ValidationResult
    ↓
    ├─ PASSED → Return draft (cost: draft only) ✅
    └─ FAILED → Verifier.complete() → ModelResponse (cost: draft + verifier) ❌
    ↓
CostCalculator.calculate() → CostBreakdown
    ↓
CascadeResult (final result with 30+ diagnostic fields)

Detailed Data Structures

# Input
query: str = "What is Python?"

# From Provider
ModelResponse = {
    content: str,
    tokens_used: int,
    cost: float,
    logprobs: list[float],
    ...
}

# From Cascade
SpeculativeResult = {
    content: str,
    draft_response: ModelResponse,
    verifier_response: Optional[ModelResponse],
    quality_check_passed: bool,
    ...
}

# Final Output
CascadeResult = {
    content: str,                 # Final response
    model_used: str,              # Which model produced final response
    total_cost: float,            # Total cost
    draft_accepted: bool,         # Was draft accepted?
    complexity: str,              # Query complexity level
    quality_score: float,         # Quality validation score
    latency_ms: float,            # Total execution time
    # ... 23+ more diagnostic fields
}

Key Design Patterns

1. Deferral/Escalation Pattern ⭐ (Core Innovation)

What: Try cheap approach first, escalate only if needed

Where: core/cascade.py - WholeResponseCascade

Why: This is how we save 40-85% on costs!

# Traditional: Always use best model
response = await expensive_model.complete(query)  # $$$$

# cascadeflow: Try cheap first
draft = await cheap_model.complete(query)  # $
if quality_check_passes(draft):
    return draft  # ✅ Save money!
else:
    return await expensive_model.complete(query)  # $$$$ (only when needed)

2. Strategy Pattern

What: Multiple routers, each decides one aspect

Where: routing/ - PreRouter, ToolRouter, ComplexityRouter

Why: Separation of concerns, composable decision-making

3. Adapter Pattern

What: BaseProvider abstracts all LLM APIs

Where: providers/ - Each provider implements BaseProvider interface

Why: Easy to add new providers, consistent interface

4. Observer Pattern

What: Telemetry observes all results without coupling

Where: telemetry/callbacks.py - CallbackManager

Why: Monitoring without modifying core logic

5. Composite Pattern

What: Multiple validators combine for final quality decision

Where: quality/ - Multiple validators combine scores

Why: Multi-dimensional quality assessment

Module Guide

When to modify each module:

Module Modify when you want to... Location
agent.py Add new top-level features, change orchestration cascadeflow/agent.py
core/cascade.py Change cascade logic, quality integration cascadeflow/core/cascade.py
core/execution.py Improve domain detection, model scoring cascadeflow/core/execution.py
schema/config.py Add new configuration options cascadeflow/schema/config.py
schema/result.py Add new diagnostic fields to results cascadeflow/schema/result.py
schema/exceptions.py Add new exception types cascadeflow/schema/exceptions.py
providers/*.py Add new LLM provider, fix provider bugs cascadeflow/providers/
quality/*.py Improve quality validation, add new checks cascadeflow/quality/
routing/*.py Change routing logic, add new routing strategies cascadeflow/routing/
streaming/*.py Improve streaming, add streaming features cascadeflow/streaming/
telemetry/*.py Add metrics, improve cost tracking cascadeflow/telemetry/
tools/*.py Improve tool calling, add tool features cascadeflow/tools/
utils/*.py Add utility functions, improve helpers cascadeflow/utils/
interface/*.py Improve terminal UI, add visual feedback cascadeflow/interface/

Common Tasks

Adding a New LLM Provider

Files to modify:

  1. Create cascadeflow/providers/newprovider.py
  2. Implement BaseProvider interface
  3. Register in cascadeflow/providers/__init__.py
  4. Add tests in tests/test_newprovider.py

Example:

# cascadeflow/providers/newprovider.py
from .base import BaseProvider, ModelResponse

class NewProvider(BaseProvider):
    async def complete(self, messages, max_tokens, temperature):
        # Implementation here
        return ModelResponse(...)

Updating Provider Pricing & Adding New Models

Overview: Provider pricing is defined in each provider's calculate_cost() method using Python dictionaries. This approach is type-safe, fast, and requires no external file dependencies.

Files to modify:

  1. cascadeflow/providers/{provider}.py - Update pricing dictionary in calculate_cost() method
  2. Update documentation if model capabilities changed

Example: Adding GPT-5 to OpenAI

# cascadeflow/providers/openai.py - calculate_cost() method

# OpenAI pricing per 1K tokens (as of December 2024)
# Source: https://openai.com/api/pricing/
pricing = {
    # GPT-5 series (NEW!)
    "gpt-5": {"input": 0.010, "output": 0.030},
    "gpt-5-turbo": {"input": 0.005, "output": 0.015},
    "gpt-5-mini": {"input": 0.0003, "output": 0.0012},

    # Existing models...
    "gpt-4o": {"input": 0.0025, "output": 0.010},
    "gpt-4o-mini": {"input": 0.00015, "output": 0.0006},
}

Why Python dict over YAML/JSON:

  • ✅ Type-safe (IDE autocomplete and validation)
  • ✅ No file I/O overhead (faster)
  • ✅ No external dependencies
  • ✅ Works in all environments (containers, serverless, etc.)
  • ✅ Can be dynamically overridden in code
  • ✅ Version controlled with code

Provider Pricing Locations:

  • OpenAI: cascadeflow/providers/openai.py (line ~800)
  • Anthropic: cascadeflow/providers/anthropic.py (calculate_cost())
  • Groq: cascadeflow/providers/groq.py (calculate_cost())
  • Together: cascadeflow/providers/together.py (calculate_cost())
  • HuggingFace: cascadeflow/providers/huggingface.py (calculate_cost())
  • Ollama: Free (always $0)
  • vLLM: Self-hosted (user-defined cost in ModelConfig)

Auto-Discovery for Local Providers:

Both Ollama and vLLM support automatic model discovery:

# Ollama - List installed models
from cascadeflow.providers.ollama import OllamaProvider
provider = OllamaProvider()
models = await provider.list_models()
# Returns: ['llama3.2:1b', 'mistral:7b', ...]

# vLLM - List served models
from cascadeflow.providers.vllm import VLLMProvider
provider = VLLMProvider(base_url="http://localhost:8000/v1")
models = await provider.list_models()
# Returns: ['meta-llama/Llama-3.2-3B-Instruct', ...]

When to update pricing:

  1. Provider announces new pricing (check official pricing pages)
  2. New model released with different pricing tier
  3. User reports cost calculation mismatch

Testing after pricing update:

# Verify pricing calculation
python -c "
from cascadeflow.providers.openai import OpenAIProvider
provider = OpenAIProvider(api_key='test')
cost = provider.calculate_cost(tokens=1000, model='gpt-5')
print(f'Cost for 1K tokens: \${cost:.6f}')
"

Adding a New Quality Check

Files to modify:

  1. Create validator in cascadeflow/quality/new_validator.py
  2. Integrate in cascadeflow/quality/quality.py (QualityValidator)
  3. Update QualityConfig if needed
  4. Add tests

Example:

# cascadeflow/quality/new_validator.py
class NewValidator:
    def validate(self, response: str, query: str) -> float:
        # Return score 0.0-1.0
        return score

Adding a New Routing Strategy

Files to modify:

  1. Create router in cascadeflow/routing/new_router.py
  2. Inherit from BaseRouter (if exists) or create standalone
  3. Integrate in CascadeAgent.run()
  4. Add tests

Adding New Diagnostic Fields to CascadeResult

Files to modify:

  1. cascadeflow/schema/result.py - Add field to dataclass
  2. cascadeflow/agent.py - Populate field when creating result
  3. cascadeflow/__init__.py - Update exports if needed (already exported)
  4. Update documentation

Improving Cost Calculation

Files to modify:

  1. cascadeflow/telemetry/cost_calculator.py - Update calculation logic
  2. Tests to verify accuracy
  3. Documentation

Note: CostCalculator is the single source of truth (v2.5+). Do NOT add cost logic elsewhere!

Architecture Principles

  1. Single Responsibility: Each module has one clear purpose
  2. Separation of Concerns: Routing, execution, validation are separate
  3. Dependency Injection: Agent receives models/config, doesn't create them
  4. Async-First: All I/O operations are async
  5. Observable: Telemetry can observe without coupling
  6. Testable: Core logic separated from I/O
  7. Extensible: Easy to add providers, routers, validators

Performance Characteristics

Cascade Performance:

  • Draft acceptance rate: 70-80% (typical)
  • Cost savings: 40-85% vs always using best model
  • Latency: 2-10x faster (when draft accepted)
  • Quality: Equal or better (validation ensures threshold)

When to skip cascade:

  • Very simple queries → Direct to cheap model (PreRouter decides)
  • Very complex queries → Direct to best model (PreRouter decides)
  • User forces direct → force_direct=True parameter

Import Patterns

Recommended (Top-Level)

from cascadeflow import (
    CascadeAgent,
    ModelConfig,
    CascadeResult,
    WholeResponseCascade,
    QualityConfig,
)

Backward Compatible (Old Paths)

# Still works! (for backward compatibility)
from cascadeflow.config import ModelConfig
from cascadeflow.exceptions import cascadeflowError
from cascadeflow.speculative import WholeResponseCascade

New Organized Paths

# Clearer structure
from cascadeflow.schema.config import ModelConfig
from cascadeflow.schema.exceptions import cascadeflowError
from cascadeflow.core.cascade import WholeResponseCascade

All three patterns work! Use top-level imports for simplicity.

Testing Strategy

Test locations:

  • tests/test_agent.py - CascadeAgent integration tests
  • tests/test_mvp_cascade_direct.py - Cascade logic tests
  • tests/test_quality_*.py - Quality validation tests
  • tests/test_providers/ - Provider-specific tests (if organized)
  • tests/test_routing.py - Routing logic tests

Run tests:

pytest                          # All tests
pytest tests/test_agent.py      # Specific file
pytest -v                       # Verbose
pytest --cov=cascadeflow        # With coverage

Backward Compatibility

100% backward compatible! All old import paths still work via sys.modules aliasing in __init__.py:

# In cascadeflow/__init__.py
sys.modules['cascadeflow.exceptions'] = schema.exceptions
sys.modules['cascadeflow.result'] = schema.result
sys.modules['cascadeflow.config'] = schema.config
sys.modules['cascadeflow.execution'] = core.execution
sys.modules['cascadeflow.speculative'] = core.cascade

This means existing code continues to work without changes.

Monorepo Workflow

Building the TypeScript Library

# Install dependencies (from root)
pnpm install

# Build TypeScript library
pnpm build
# OR build just core package
cd packages/core && pnpm build

# Run TypeScript tests
cd packages/core && pnpm test

# Development mode (watch for changes)
cd packages/core && pnpm dev

Working with Both Libraries

# Python development
pip install -e .
pytest tests/

# TypeScript development
cd packages/core
pnpm build
pnpm test

# Build everything (monorepo)
pnpm build  # Uses Turborepo to build all packages

Package Management

Python:

  • Uses pyproject.toml and requirements.txt
  • Standard pip/poetry workflows

TypeScript:

  • Uses pnpm workspaces
  • Packages defined in pnpm-workspace.yaml
  • Turborepo for coordinated builds

Why pnpm?

  • Fast installs (content-addressable storage)
  • Strict dependency resolution (no phantom dependencies)
  • Efficient disk space usage
  • Industry standard for monorepos

Recent Changes

v0.2.0 (December 2024) - Monorepo + Production Readiness

Monorepo Architecture:

  • Added TypeScript/JavaScript library (packages/core/)
  • Set up pnpm workspaces + Turborepo
  • Simple packages/ structure (industry standard)
  • Full feature parity with Python library (MVP: OpenAI only)
  • Tested with real OpenAI API (97.8% savings validated)

TypeScript Library Features:

  • CascadeAgent with two-tier cascade
  • OpenAI provider with GPT-5 support
  • Full cost tracking and savings calculation
  • Type-safe configuration (TypeScript strict mode)
  • Peer dependencies (small bundle size)
  • Zero-config builds with tsup

Code Quality:

  • Removed 85 changelog-style comments from codebase (cleaner, more maintainable)
  • Professional production-ready code without bloat
  • Verified no inline test suites (proper test separation already exists)

Examples & Documentation:

  • Fixed edge_device.py example (imports, indentation, syntax)
  • Created docs/guides/edge_device.md (600-line comprehensive guide)
  • Updated examples/README.md (now documents all 11 examples)
  • Moved test_cascadeflow.py to proper tests/ directory
  • Total documentation: 10 guides, ~10,280 lines

Provider Updates:

  • Added GPT-5 family to OpenAI provider (gpt-5, gpt-5-turbo, gpt-5-mini)
  • Updated pricing with proper documentation and source references
  • Organized pricing by model generation (GPT-5 → GPT-4o → GPT-4 → GPT-3.5)
  • Verified auto-discovery already implemented for Ollama and vLLM

Developer Experience:

  • Easy to get started (all examples validated and working)
  • Scales to production (clean code, documented patterns)
  • State-of-the-art Python approach (Pydantic, type-safe, no external config files)

v0.1.0 (October 2024) - Major Restructuring

Structure Changes:

  • Created schema/ directory for data structures (config, result, exceptions)
  • Created core/ directory for execution engine (cascade, execution)
  • Renamed speculative.py → cascade.py for clarity
  • Moved utils.py, caching.py, presets.py → utils/ directory
  • Root level now only contains agent.py and __init__.py

Benefits:

  • Clearer separation of concerns
  • Easier navigation for contributors
  • Follows industry best practices (FastAPI, Django patterns)
  • 100% backward compatible (all old imports still work)

Next Steps

  • New Contributors: Open an issue on GitHub to get started
  • Adding Features: Review this document for architecture guidance
  • Questions: Open an issue on GitHub

Last Updated: November 2024 Version: v0.4.0