Signal Loom AI — LangChain Integration

Install

npm install signalloomai

Requires Node.js 18+.

Quick Start

import { LoomLensTool } from 'signalloomai';

// Initialize with your API key
const tool = new LoomLensTool({ apiKey: process.env.SIGNALLOOM_API_KEY });

// Get a cost estimate
const result = await tool.estimate({
  job_description: 'Customer support agent with 5 sub-agents handling billing and shipping',
  num_agents: 5,
  estimated_runtime_minutes: 20,
  complexity: 'standard',
  target_models: [
    'openai/gpt-4o',
    'anthropic/claude-sonnet-4-20250514',
    'google/gemini-2.5-flash',
  ],
});

console.log(`Cheapest model: ${result.cheapest_model}`);
console.log(`Savings vs most expensive: $${result.savings_vs_expensive}`);

Use with LangChain Agents

import { LoomLensTool } from 'signalloomai';
import { ChatOpenAI } from '@langchain/openai';
import { createReactAgent } from 'langchain-agents';

// Initialize
const loomLensTool = new LoomLensTool({ apiKey: process.env.SIGNALLOOM_API_KEY });
const llm = new ChatOpenAI({ modelName: 'gpt-4o', temperature: 0 });

// Create agent with LoomLens as a tool
const agent = createReactAgent({
  llm,
  tools: [loomLensTool.toLangChainTool()],
});

// Run
const response = await agent.invoke({
  input: 'Compare the cost of running a 10-agent research pipeline on GPT-4o vs Claude Sonnet 4',
});

API Key

Get your API key at signalloomai.com.

Set it as an environment variable:

export SIGNALLOOM_API_KEY=sk_...

Or pass it directly:

const tool = new LoomLensTool({ apiKey: 'sk_your_key_here' });

Prompt Integrity

LoomLens AI does NOT log prompts or job descriptions.

We estimate cost based on token counts and model pricing — not by reading your content. See our full Prompt Integrity Policy.

Available Models

| Provider | Model | |----------|-------| | OpenAI | gpt-4o, gpt-4o-mini | | Anthropic | claude-sonnet-4-20250514, claude-opus-4-6 | | Google | gemini-2.5-flash, gemini-2.5-pro | | DeepSeek | deepseek-chat-v3 | | xAI | grok-3 | | MiniMax | MiniMax-M2.7 |

License

MIT · signalloomai.com/terms.html