Production-grade Claude agents built on the Claude Agent SDK, side-by-side with expert AI engineers. Autonomous, multi-step, tool-using agents on WhatsApp, SMS, email, Slack, Teams, Telegram or your website. Made for small business owners.
Claude is the strongest model on the market for agentic work. It leads on tool use, long-horizon planning and code generation, which is exactly what real agents need to do reliably in production. A custom Claude agent is not a chatbot wrapped around Claude; it is an autonomous worker built on the Claude Agent SDK, integrated with your systems and capable of completing multi-step work without a human babysitter.
Modassembly is the specialist shop for custom Claude agents. We build on Anthropic's official Claude Agent SDK, wire the agent into your tools through APIs, webhooks and the Model Context Protocol (MCP), and deploy to WhatsApp Business, SMS, email, Slack, Teams, Telegram or your website with one click. You get the frontier model wired into your business, without the months of engineering work it would otherwise take.
The result is an AI employee that thinks, plans, calls tools, remembers context and finishes the task. Not a chatbot that quotes your FAQ back at customers. Not a flow builder that breaks the moment a request is phrased unexpectedly. A real Claude agent, built for your business.
The Claude Agent SDK is Anthropic's official framework for building autonomous Claude agents. It gives us the production primitives that matter: the agent loop, tool use, sub-agent orchestration, memory management, file editing and code execution. Every custom AI employee we build inherits these capabilities directly.
On top of the SDK, we add the production engineering you cannot afford to skip: Anthropic API integration, MCP servers for your internal systems, channel deployment (WhatsApp Business, SMS A2P 10DLC, Slack, Teams, Telegram, web widget), monitoring, on-call and the managed service that keeps your agent running and improving over time. You get a deployed Claude agent in your business, not a research prototype on a developer's laptop.
Handle customer service 24/7 on every channel. Read your orders, inventory and customer data live. Take action and escalate cleanly when it should.
An AI Admin that runs your calendar, drafts emails, takes notes and triages tasks. Inside the WhatsApp or Slack thread you already check constantly.
Categorize transactions, reconcile accounts, surface insights, build reports on demand. Reads your accounting and data systems directly.
Qualify leads, draft outreach, follow up automatically, run re-engagement campaigns. Pushes results back to your CRM with full context attached.
Anthropic's Claude models lead on three things that matter for agentic work: tool use accuracy, long-horizon planning, and code generation. Tool use is how your agent actually completes tasks (book a meeting, refund a charge, update inventory). Long-horizon planning is how it stays coherent across a multi-step workflow. Code generation is how it extends its own capabilities and builds the integrations it needs as it goes.
Industry analysis consistently ranks Claude as the strongest model for production agents. That is why we build on Claude, and why we are a specialist Claude agent shop rather than a generic AI consultancy. The frontier model matters, and we are not hedging.
Model Context Protocol (MCP) is the open standard from Anthropic for connecting AI assistants to tools, data sources and systems. Modassembly builds on MCP, so your custom Claude agent can use standard MCP servers (Google Drive, Slack, GitHub, Notion and many more) out of the box. We can also expose your internal systems as MCP servers, so the agent uses them like first-class tools.
Common integrations include HubSpot, Salesforce, Pipedrive, Zoho, Shopify, WooCommerce, Stripe, Google Calendar, Gmail, Outlook, Slack, Teams, WhatsApp Business, Twilio and custom internal services. Built side-by-side with an expert AI engineer in your group chat, the integrations get architected with you live. For Custom AI Fleet plans, our team handles the integration layer end to end.
Maximum flexibility, maximum engineering work. You own the agent loop, tool orchestration, memory, session management, messaging integration, carrier compliance, deployment, monitoring and on-call. Modassembly gives you the same flexibility with all of those concerns handled, so you focus on the business logic instead of the plumbing.
Pre-built Claude agent templates. Fast to start, hard to customize past the template. We architect the integration with your existing systems live, orchestrate multiple specialized agents tailored to your work, and deliver a secure, production-grade solution with managed service and personalized support.
Building blocks, not a deployed product. You still need to build the agent, host it, monitor it and maintain it. Modassembly delivers the finished Claude agent end to end, on top of the official Claude Agent SDK and best-in-class infrastructure.
“We cross-reference food supply lists with our inventory to build cost-benefit analyses for clients. This task used to take me 2-3 days. With AI, I can do it in 2 hours.”
Build your agents side-by-side with an expert AI engineer inside a WhatsApp, SMS, Telegram, Slack or Teams group. We architect, build and ship with you, not from a template.
Start your free trial14-day free trial with $20 in AI credits
A custom Claude agent is an autonomous AI agent built on Claude, Anthropic's frontier model. Unlike a generic chatbot, a custom Claude agent is tailored to your specific business, integrated with your tools and systems, and capable of multi-step reasoning, tool use and long-horizon work. Modassembly builds production-grade custom Claude agents for customer service, executive assistance, bookkeeping, marketing, sales, dispatching and more.
The Claude Agent SDK is the official framework from Anthropic for building autonomous Claude agents. It handles the agent loop, tool use, memory, sub-agents and the production primitives you need to run Claude reliably as an agent (not just a chatbot). Modassembly builds every custom AI employee on the Claude Agent SDK, so your agents inherit Claude's reasoning, tool use and long-horizon capabilities directly, with our production engineering wrapped around them.
Using Claude directly via the Anthropic API gives you the model. Modassembly gives you a deployed, integrated agent. We architect the agent on top of the Claude Agent SDK, write the integrations with your tools (CRM, calendar, e-commerce, internal systems), handle the channel deployment (WhatsApp Business API, SMS A2P 10DLC compliance, Slack, Teams, Telegram, your website), and run it in production with managed service and personalized support. You skip months of engineering work.
You build it side-by-side with an expert AI engineer inside a WhatsApp, SMS, Telegram, Slack or Teams group. We architect your custom Claude agent with you live, write the integrations with your tools and systems, and ship it to WhatsApp, SMS, email, Slack, Teams, Telegram or your website with 1-click deployment. Don't want to build it yourself? Our team designs, builds and deploys your Claude agent end to end.
A custom Claude agent can handle customer service 24/7, manage your calendar as an AI Admin, book and reschedule appointments, qualify leads, draft outreach, automate bookkeeping, run data analysis, build internal tools, orchestrate other agents and more. Each Claude agent is built for your specific workflows, tools and channels. You tell it what you need; it learns your systems; it does the work.
Yes. Model Context Protocol is the open standard from Anthropic for connecting Claude agents to tools, data sources and systems. Modassembly builds on MCP, so your Claude agent can use standard MCP servers and tools out of the box, and we can expose your internal systems as MCP servers for the agent to use. This keeps your setup interoperable with the wider Claude ecosystem.
Yes. Modassembly is an official WhatsApp Business Platform Tech Provider, so we deploy your custom Claude agent directly to WhatsApp Business with 1 click. We also handle US SMS A2P 10DLC carrier registration, plus deployment to email, Slack, Teams, Telegram or your website. Your Claude agent goes live on the channels your customers already use.
See the pricing section above for current plans. Vertical AI Employee starts at $35/month and includes 1 AI Admin plus 1 dedicated AI Employee (your custom Claude agent), 1-click channel deployment and AI Engineer on-demand for building together. AI Workforce adds 3 more agents, agent-to-agent communication, more channels and priority AI Engineer access. Every plan includes AI credits at face value (no markup) and a 14-day free trial.
Yes. Modassembly does not sell, share or train on your business or customer data. Your Claude agent runs in a managed environment with scoped access to your systems, so it only reads and writes what you authorize. For Custom AI Fleet plans we can further scope data access, redact sensitive fields and align with compliance frameworks like GDPR.