Routewise

Open-Source Step-Level Router for AI Agents, Claude Code, Cursor & MCP

Stop choosing AI models manually. RouteWise automatically decomposes workflows, routes each step to the best model/tool, evaluates outputs, and generates a complete execution trace.

npm version License: Apache 2.0 TypeScript

---

Why RouteWise?

Every AI workflow has steps that need different models. Debugging needs deep reasoning. Summarization needs speed. Code generation needs accuracy. Documentation needs clarity.

The problem:

• You manually switch between Claude, GPT, Gemini, and local tools
• Simple tasks get expensive when you send everything to one premium model
• Complex workflows get routed poorly because you guess instead of measure
• No visibility into why a model was chosen or how much it cost
• Claude Code and Cursor don't tell you which model would be best for each step

RouteWise solves this by sitting between your workflow and your models. It decomposes tasks into steps, classifies each step, selects the right model within your constraints (cost, latency, quality, privacy), executes, evaluates, and traces every decision.

Works with Claude Code, Cursor, any MCP client, or standalone from the terminal.

---

Quick Start

Install and run your first workflow in under 60 seconds:

# Install
npm install -g routewise

# Set your API keys (use whichever providers you have)
export ANTHROPIC_API_KEY="sk-ant-..."
export OPENAI_API_KEY="sk-..."
export VERTEX_PROJECT_ID="my-project"  # Optional: for Gemini models

# Run a workflow
routewise run "Fix the failing authentication test and update docs"

Example Output

routewise — running workflow
Task: Fix the failing authentication test and update docs

step_001 [reasoning] Plan the debugging approach
  → claude-sonnet-4.6 (best-fit, confidence: 90%)
  ✓ passed ($0.0032, 2847ms)

step_002 [code-gen] Fix the authentication middleware
  → claude-sonnet-4.6 (user-preferred, confidence: 95%)
  ✓ passed ($0.0058, 3201ms)

step_003 [code-gen] Update test assertions
  → gpt-4.1 (fallback, confidence: 80%)
  ✓ passed ($0.0019, 1843ms)

step_004 [writing] Update authentication documentation
  → gemini-3.5-flash (best-fit, confidence: 90%)
  ✓ passed ($0.0002, 892ms)

✓ completed — 4 steps, 4 passed
Cost: $0.0111 │ Time: 8.8s
Trace: .routewise/runs/run_20260613_k7m2x1/

Every decision is logged. Every cost is tracked. Every step is traceable.

---

How It Works

User Task (natural language)
     │
     ▼
┌─────────────┐
│  Decomposer │  Breaks task into ordered steps
└──────┬──────┘
       │
       ▼
┌─────────────┐
│ Classifier  │  Labels: reasoning | code-gen | summarization | writing | research | editing
└──────┬──────┘
       │
       ▼
┌─────────────┐
│   Router    │  Picks best model per step within constraints (cost, latency, quality)
└──────┬──────┘
       │
       ▼
┌─────────────┐
│  Executor   │  Calls the selected model with step context
└──────┬──────┘
       │
       ▼
┌─────────────┐
│  Evaluator  │  Scores output quality with heuristics + human verdict
└──────┬──────┘
       │
       ▼
┌─────────────┐
│   Trace     │  Logs: model, reason, cost, latency, quality, verdict
└─────────────┘

RouteWise is not another AI wrapper. It's infrastructure — a routing layer that makes multi-model workflows automatic, traceable, and cost-efficient.

---

Supported Integrations

Claude Code

RouteWise works as an MCP server inside Claude Code. Add it to your MCP config:

{
  "mcpServers": {
    "routewise": {
      "command": "npx",
      "args": ["-y", "routewise", "serve"]
    }
  }
}

Claude Code can then call routewise_run, routewise_step, routewise_trace, and routewise_models as tools — getting step-level routing without leaving the Claude Code workflow.

Cursor

Use RouteWise as an MCP server in Cursor's agent mode. Same config as above — Cursor's MCP integration discovers RouteWise tools automatically. Your Cursor agent can route individual steps to different models based on the task type.

MCP (Model Context Protocol)

RouteWise implements a full MCP server with four tools:

Tool	Description
routewise_run	Decompose and execute a full workflow
routewise_step	Route and execute a single step
routewise_trace	Retrieve routing trace (why each model was chosen)
routewise_models	List available models with costs and capabilities

Any MCP client (Claude Code, Cursor, VS Code agents, custom agents) can call these tools.

Standalone CLI

Use RouteWise directly from the terminal — no IDE required:

routewise run "Build an MVP for a todo app with auth"
routewise step "Summarize this PR" --type summarization
routewise trace --run run_20260613_k7m2x1
routewise models

Providers

Provider	Models	Status
Anthropic	Claude Opus 4.8, Sonnet 4.6, Haiku 4.5	✅ Supported
OpenAI	GPT-5.5, o3, GPT-4.1	✅ Supported
Google Vertex AI	Gemini 3.5 Flash, 3.1 Pro, 3.1 Flash Lite	✅ Supported
Local models (Ollama)	Any	🔜 Planned
OpenRouter	Any	🔜 Planned

---

Example Workflows

RouteWise shines when a task has steps that need different strengths:

# Fix a bug — needs reasoning + code + testing
routewise run "Fix the race condition in the checkout flow"

# Generate tests — needs code analysis + code generation
routewise run "Write comprehensive tests for the auth module"

# Create a design document — needs research + reasoning + writing
routewise run "Create an architecture design for the new payment system"

# Build an MVP — needs planning + code + docs + content
routewise run "Build an MVP for a URL shortener with analytics"

# Launch content — needs writing + editing + summarization
routewise run "Create launch post, demo script, and README for the new feature"

---

Routing Trace

Every run produces a trace at .routewise/runs/<run_id>/:

.routewise/runs/run_20260613_k7m2x1/
├── trace.json       # Run metadata (cost, time, status)
├── steps.jsonl      # Per-step decisions (one JSON per line)
└── artifacts/       # Step outputs

trace.json

{
  "runId": "run_20260613_k7m2x1",
  "task": "Fix the failing authentication test",
  "status": "completed",
  "totalSteps": 4,
  "totalCostUsd": 0.0111,
  "totalLatencyMs": 8783,
  "constraints": { "maxCostPerRun": 0.50, "maxLatencyPerStep": 30000 }
}

steps.jsonl (one line per step)

{
  "stepId": "step_001",
  "type": "reasoning",
  "goal": "Plan debugging approach",
  "model": "claude-sonnet-4.6",
  "provider": "anthropic",
  "reason": "best-fit",
  "confidence": 0.9,
  "costUsd": 0.0032,
  "latencyMs": 2847,
  "evaluation": { "passed": true, "checks": ["ordered-items: OK", "min-length: OK"] }
}

View any trace with routewise trace or routewise trace --run <id>.

---

Comparison

Feature	RouteWise	Claude Code alone	Cursor alone	Single-model scripts
Step-level routing	✅ Per-step model selection	❌ One model	❌ One model	❌ One model
Cost awareness	✅ Budget constraints	❌ No visibility	❌ No visibility	❌ Manual tracking
Execution traces	✅ Full trace per run	❌ No traces	❌ No traces	❌ Manual logging
Multi-provider	✅ Anthropic + OpenAI + Vertex	⚠️ Anthropic only	⚠️ Limited	❌ One SDK
MCP integration	✅ Native MCP server	✅ MCP client	✅ MCP client	❌ None
Human verdict	✅ Accept/reject per step	❌ N/A	❌ N/A	❌ N/A
Workflow decomposition	✅ Automatic	❌ Manual	❌ Manual	❌ Manual
Quality evaluation	✅ Per-step heuristics	❌ N/A	❌ N/A	❌ N/A

RouteWise doesn't replace Claude Code or Cursor — it makes them better by adding step-level routing intelligence underneath.

---

Configuration

Create routewise.config.ts (or run routewise init):

import { defineConfig } from 'routewise';

export default defineConfig({
  providers: {
    anthropic: { apiKey: 'env:ANTHROPIC_API_KEY' },
    openai: { apiKey: 'env:OPENAI_API_KEY' },
    vertex: {
      projectId: 'env:VERTEX_PROJECT_ID',
      location: 'us-central1',
    },
  },
  constraints: {
    maxCostPerRun: 0.50,        // USD
    maxCostPer1kTokens: 0.02,   // USD
    maxLatencyPerStep: 30_000,  // ms
    preferredProviders: ['anthropic', 'openai', 'vertex'],
    privacyLevel: 'standard',
  },
  routing: {
    reasoning:      { prefer: 'claude-sonnet-4.6', fallback: 'gpt-4.1' },
    'code-gen':     { prefer: 'claude-sonnet-4.6', fallback: 'gpt-4.1' },
    summarization:  { prefer: 'gemini-3.1-flash-lite', fallback: 'claude-haiku-4.5' },
    writing:        { prefer: 'claude-sonnet-4.6', fallback: 'gpt-4.1' },
    research:       { prefer: 'gemini-3.1-pro', fallback: 'gpt-5.5' },
    editing:        { prefer: 'gemini-3.5-flash', fallback: 'claude-haiku-4.5' },
  },
  trace: {
    store: 'local',
    directory: '.routewise/runs',
  },
});

Zero-config works too — RouteWise uses sensible defaults with just API keys set as environment variables.

---

Available Models

$ routewise models

Model	Provider	Cost/1k	Latency	Quality	Best For
claude-opus-4.8	Anthropic	$0.015	8000ms	0.98	Complex reasoning, hard problems
claude-sonnet-4.6	Anthropic	$0.003	3000ms	0.92	Daily driver, code, writing
claude-haiku-4.5	Anthropic	$0.00025	800ms	0.75	Instant text, simple tasks
gpt-5.5	OpenAI	$0.005	4000ms	0.95	Autonomous agents
o3	OpenAI	$0.01	15000ms	0.97	STEM, science, thinking
gpt-4.1	OpenAI	$0.002	2500ms	0.90	General versatility
gemini-3.5-flash	Vertex	$0.0001	1000ms	0.82	Fast multimodal
gemini-3.1-pro	Vertex	$0.00125	3500ms	0.91	Deep reasoning, huge context
gemini-3.1-flash-lite	Vertex	$0.00005	500ms	0.70	Cheapest, simplest tasks

Adding a new model is one entry in src/providers/models.ts — it auto-registers everywhere.

---

CLI Reference

Command	Description
routewise run "<task>"	Decompose and execute a full workflow
routewise run "<task>" --no-confirm	Skip human verdict prompts
routewise step "<prompt>"	Route and execute a single step
routewise step --type code-gen "<prompt>"	Override classification
routewise trace	Show latest routing trace
routewise trace --run <id>	Show specific trace
routewise models	List available models
routewise init	Create config file
routewise config check	Validate config
routewise serve	Start MCP server (stdio)

---

Architecture

routewise/
├── src/
│   ├── cli/        → CLI commands (run, step, trace, init, serve, models)
│   ├── core/       → Routing engine (classifier, selector, executor, evaluator, decomposer, router)
│   ├── config/     → Config schema, loader, defaults (Zod validation)
│   ├── providers/  → Model adapters (Anthropic, OpenAI, Vertex) + model catalog
│   ├── mcp/        → MCP server (4 tools for Claude Code, Cursor, any MCP client)
│   └── trace/      → Trace storage and rendering
├── tests/          → Unit tests (125 passing)
└── dist/           → Built CLI + library

---

Adding New Models (Plug and Play)

Edit src/providers/models.ts:

{
  id: 'your-new-model',
  provider: 'openai',
  capabilities: ['reasoning', 'code-gen', 'writing'],
  costPer1kTokens: 0.004,
  p95LatencyMs: 2000,
  qualityScore: 0.93,
  contextWindow: 256000,
  supportsStructuredOutput: true,
  tags: ['new-feature'],
  metadata: { description: 'Your model description' },
}

It immediately appears in routing, routewise models, and MCP tools. No other files to touch.

---

Adding New Providers

1. Create src/providers/your-provider.ts implementing the Provider interface
2. Add model entries to src/providers/models.ts
3. Register in src/cli/setup.ts (3 lines)

The Provider interface is intentionally minimal:

interface Provider {
  name: string;
  complete(prompt: string, options?: ProviderCompleteOptions): Promise<ProviderResponse>;
  completeWithModel(model: string, prompt: string, options?: ProviderCompleteOptions): Promise<ProviderResponse>;
  isAvailable(): boolean;
  listModels(): string[];
}

---

Roadmap

• Core routing engine (classify → select → execute → evaluate → trace)
• CLI with full workflow support
• MCP server (Claude Code, Cursor, any MCP client)
• Anthropic provider (Opus 4.8, Sonnet 4.6, Haiku 4.5)
• OpenAI provider (GPT-5.5, o3, GPT-4.1)
• Google Vertex AI provider (Gemini 3.5 Flash, 3.1 Pro, 3.1 Flash Lite)
• Human verdict (accept/reject per step)
• Execution traces with full cost/latency tracking
• Benchmark layer (auto-improve routing from execution history)
• OpenRouter provider
• Ollama / local model provider
• Web UI for trace visualization
• Team features (shared routing policies)
• A/B testing between models
• Plugin system for custom evaluators

---

Development

git clone https://github.com/your-org/routewise.git
cd routewise
pnpm install
pnpm build        # Build CLI + library
pnpm test         # Run 125 tests
pnpm typecheck    # Type check (strict mode)
pnpm lint         # Lint with Biome

---

Contributing

RouteWise is open source and contributions are welcome. Areas where help is valuable:

• New provider adapters (OpenRouter, Ollama, Replicate)
• Better step classification heuristics
• Evaluation improvements
• Benchmark/comparison data
• Documentation and examples

See CONTRIBUTING.md for guidelines.

---

License

Apache 2.0 — use RouteWise in your projects, teams, and products. See LICENSE for details.