Agent Toolbelt

Focused API tools for AI agents and developers. 16 tools covering data transformation, text extraction, LLM utilities, document analysis, and contract review — each one a focused microservice, billed per call.

Production API: https://agent-toolbelt-production.up.railway.app

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Quickstart

# Get a free API key
curl -X POST https://agent-toolbelt-production.up.railway.app/api/clients/register \
  -H "Content-Type: application/json" \
  -d '{"email": "you@example.com"}'

# Call a tool
curl -X POST https://agent-toolbelt-production.up.railway.app/api/tools/token-counter \
  -H "Authorization: Bearer atb_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"text": "Hello world", "models": ["gpt-4o", "claude-3-5-sonnet"]}'

---

npm SDK + LangChain

npm install agent-toolbelt

Typed client

import { AgentToolbelt } from "agent-toolbelt";

const client = new AgentToolbelt({ apiKey: process.env.AGENT_TOOLBELT_KEY! });

// Count tokens across models with cost estimates
const tokens = await client.tokenCounter({
  text: myDocument,
  models: ["gpt-4o", "claude-3-5-sonnet"],
});

// Extract structured data from raw text
const contacts = await client.textExtractor({
  text: emailBody,
  extractors: ["emails", "phone_numbers", "addresses"],
});

// Convert HTML to clean Markdown for LLM consumption
const markdown = await client.markdownConverter({
  content: scrapedHtml,
  from: "html",
  to: "markdown",
});

LangChain integration

import { AgentToolbelt } from "agent-toolbelt";
import { createLangChainTools } from "agent-toolbelt/langchain";
import { createReactAgent } from "@langchain/langgraph/prebuilt";
import { ChatOpenAI } from "@langchain/openai";

const client = new AgentToolbelt({ apiKey: process.env.AGENT_TOOLBELT_KEY! });
const tools = createLangChainTools(client); // 16 ready-to-use DynamicStructuredTools

const agent = createReactAgent({
  llm: new ChatOpenAI({ model: "gpt-4o" }),
  tools,
});

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Tools

Tool	What it does	Price
text-extractor	Extract emails, URLs, phones, dates, currencies, addresses, names from any text	$0.0005/call
token-counter	Count tokens across 15 LLM models (GPT-4o, Claude 3.5, etc.) with cost estimates	$0.0001/call
schema-generator	Generate JSON Schema, TypeScript interfaces, or Zod validators from plain English	$0.001/call
csv-to-json	Convert CSV to typed JSON — auto-detects delimiters, casts types, infers column types	$0.0005/call
markdown-converter	Convert HTML ↔ Markdown. Clean up web content for LLM consumption	$0.0005/call
url-metadata	Fetch a URL and extract title, description, OG tags, favicon, author, publish date	$0.001/call
regex-builder	Build and test regex patterns from natural language. Returns JS/Python/TS code snippets	$0.0005/call
cron-builder	Convert schedule descriptions to cron expressions with next-run preview	$0.0005/call
address-normalizer	Normalize US addresses to USPS format with component parsing and confidence score	$0.0005/call
color-palette	Generate color palettes from descriptions or hex seeds with WCAG scores and CSS vars	$0.0005/call
brand-kit	Full brand kit — color palette, typography pairings, CSS/Tailwind design tokens	$0.001/call
image-metadata-stripper	Strip EXIF/GPS/IPTC/XMP metadata from images for privacy	$0.001/call
meeting-action-items	Extract action items, decisions, and summary from meeting notes	$0.05/call
prompt-optimizer	Analyze and improve LLM prompts — scores + rewrite + change summary	$0.05/call
document-comparator	Semantic diff of two document versions with significance ratings	$0.05/call
contract-clause-extractor	Extract and risk-flag key clauses from contracts and legal docs	$0.10/call

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Discover tools programmatically

Agents can auto-discover all tools at runtime:

curl https://agent-toolbelt-production.up.railway.app/api/tools/catalog

{
  "tools": [
    {
      "name": "text-extractor",
      "description": "Extract structured data...",
      "endpoint": "/api/tools/text-extractor",
      "metadata": { "pricing": "$0.0005 per call" }
    }
  ],
  "count": 16
}

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Pricing

Tier	Price	Monthly calls	Rate limit
Free	$0/mo	1,000	10/min
Starter	$29/mo	50,000	60/min
Pro	$99/mo	500,000	300/min
Enterprise	Custom	5,000,000	1,000/min

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Integrations

• npm — npm install agent-toolbelt — typed client + LangChain tools
• LangChain/LangGraph — createLangChainTools(client) — 16 DynamicStructuredTool instances
• Claude MCP — npx -y agent-toolbelt-mcp — works with Claude Desktop and Claude Code
• OpenAI GPT Actions — OpenAPI spec at /openapi/openapi-gpt-actions.json
• RapidAPI — listed on the RapidAPI marketplace

Claude MCP

Claude Desktop — add to claude_desktop_config.json:

{
  "mcpServers": {
    "agent-toolbelt": {
      "command": "npx",
      "args": ["-y", "agent-toolbelt-mcp"],
      "env": {
        "AGENT_TOOLBELT_KEY": "atb_your_key_here"
      }
    }
  }
}

Claude Code — one command:

claude mcp add agent-toolbelt -e AGENT_TOOLBELT_KEY=atb_your_key_here -- npx -y agent-toolbelt-mcp

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License

MIT