docs: Add StackOne to AI Agent Tools Catalog

[glebedel]

Add StackOne to AI Agent Tools Catalog

Summary

This PR adds StackOne to the catalog of AI agent tools.

What is StackOne?

StackOne is a unified API platform that provides AI agents with access to 100+ business system integrations across multiple categories including HR (HiBob, BambooHR), ATS (Greenhouse, Lever), CRM (Salesforce, HubSpot), and many others.

Changes

• Added StackOne entry to the Search section
• Link: https://docs.stackone.com/agents/typescript/introduction (could have linked to other part of the docs, eg the MCP interfaces or A2A but this is probably the most appropriate here.
• Description: toolset for AI agents with 100+ business system integrations (HR, ATS, CRM, etc.) via TypeScript & Python SDKs, MCP & A2A
• Pricing: Free/Paid

Key Features

• Multi-SDK Support: TypeScript SDK & Python SDK compatible with major agent frameworks
• MCP Integration: Model Context Protocol servers for LLM clients (Claude, ChatGPT, Cursor, etc.)
• A2A (Agent-to-Agent): Direct agent communication capabilities
• Multi-Tenant Support: Built-in handling of customer accounts and permissions
• Framework Integrations: Native support for OpenAI, Vercel AI SDK, LangChain, CrewAI, and more

Why This Addition?

StackOne simplifies building AI Agents (whether these are b2b agents or not) by providing a single integration point for multiple business systems, making it easier for developers to create AI agents that can interact with real-world business data and workflows.