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Build Your Custom AI Agent
Side-by-Side with an Expert

Custom Claude agents for small business owners. Built live with an expert AI engineer inside a WhatsApp, SMS, Telegram, Slack or Teams group. We architect, integrate and deploy with you, not from a template.

How Modassembly Builds Custom AI Agents

Most AI agent builders give you a template and a config UI. That works until you need anything specific, which is almost immediately. Modassembly is different: we build your agent with you, live, inside a WhatsApp, SMS, Telegram, Slack or Teams group, alongside an expert AI engineer. The integrations get architected as you talk through them. You see decisions in real time. You stay in control without having to write code.

This is the higher-margin offer for a reason: it produces agents that actually fit your business. Templates produce generic chatbots that fall over when the workflow gets specific. Live engineering produces custom Claude agents that do real work, integrated with your real tools, deployed to the channels your customers and team actually use.

The Build Process

1

Tell us what you need

Sign up and tell your AI Admin (or an AI engineer) what you want your agent to do. In plain language. No technical specs.

2

Architect with an engineer

Inside a WhatsApp, SMS, Telegram, Slack or Teams group, the engineer asks the questions that matter and sketches the architecture with you live.

3

Build & integrate live

The engineer writes the integrations with your tools (CRM, calendar, e-commerce, internal systems) and shows you components as they work.

4

1-click deploy

Ship your agent to WhatsApp, SMS, email, Slack, Teams, Telegram or your website with 1 click. We handle the channel infrastructure.

Why Building Live Beats Templates

Templated AI agent builders are fast to start and impossible to customize past the template. The moment your workflow needs something specific (your particular CRM, your refund policy, your unusual booking flow), you hit a wall and have to wait for support or migrate to a custom build anyway.

Building live with an engineer is the opposite. There is no template ceiling. Anything you can describe, the engineer can architect, including the messy parts that templates skip over: edge cases, escalation rules, integration quirks, brand voice, compliance constraints. And because you are watching the architecture get drawn in front of you, you understand how it works and can change it later.

The other advantage is speed. Most templates take a week to misconfigure. A WhatsApp pairing session with an engineer can scope an agent in 30 minutes and have something working the same day.

What Kind of AI Agents We Build

AI Customer Service Agents

24/7 customer service on WhatsApp, SMS, email, Slack, Teams, Telegram or your website. Reads your orders, inventory and customer data live.

AI Executive Assistants

Your AI Admin runs the calendar, drafts emails, schedules meetings, follows up on tasks. Inside the chat you already check.

AI Bookkeepers

Categorize transactions, reconcile accounts, generate reports, surface anomalies. Reads your accounting systems directly.

AI Sales & Marketing Agents

Qualify leads, draft outreach, follow up automatically, run re-engagement campaigns. Pushes results back to your CRM.

AI Data Analysts

Pull insights from your data, build reports on demand, surface trends. Reads your databases and analytics systems live.

Multi-Agent Workforce

An AI Admin coordinating multiple specialized agents that share context and pass work between them. A small virtual team for your business.

Modassembly vs Other Ways to Build an AI Agent

Template-based AI agent builders

Fast to start, hard to customize past the template. You hit a ceiling the moment your workflow gets specific. Modassembly has no template ceiling because we build the agent with you, live.

No-code automation platforms

Zapier, Make and similar tools chain predefined triggers and actions. They break when the workflow needs judgment or language understanding. AI agents take over the part no-code cannot do.

DIY on the Anthropic API

Maximum flexibility, months of engineering work. You own the agent loop, integrations, deployment, monitoring and compliance. We deliver the same flexibility as a managed service.

AI consulting firms

Bespoke work, bespoke price tag. Works for enterprise, overkill for small business. Modassembly is a specialist shop built for small business owners: enterprise-grade architecture without the enterprise invoice.

“My day-to-day job is making systems integrations between call centers, Salesforce, Zoho and marketing campaigns. With AI Agents, we're a smaller team, getting more done and faster.”

Johny Gallo, Owner, Journeys Through Search

Built Alongside You, Live

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 trial

Simple, transparent pricing

14-day free trial with $20 in AI credits

Vertical AI Employee

$35
/ month
Includes $20 in AI credits
  • 1 AI Admin agent (your personal assistant)
  • 1 dedicated AI Employee (e.g. customer manager, web developer, back-office operator, etc.)
  • 1-click deployment to WhatsApp, SMS, your website or Telegram
  • Automate 1 business workflow end to end
  • AI Engineer on-demand: build side-by-side with an AI expert in a WhatsApp, SMS, or Telegram group. First month free, then $1 / minute (subject to availability)
  • 14-day free trial ($20 in AI credits)
Most Popular

AI Workforce

$80
/ month
Includes $50 in AI credits
  • 1 AI Admin agent (your personal assistant)
  • 4 dedicated AI Employees (e.g. business developer, marketing operator, data analyst, etc.)
  • 1-click deployment to WhatsApp, SMS, your website, email, Slack, Teams, Telegram and more
  • Automate 4 business workflows end to end
  • AI Employees communicate with each other
  • AI Engineer on-demand: build side-by-side with an AI expert in a WhatsApp, SMS, Telegram, Slack or Teams group. First month free, then $0.75 / minute (priority availability)
  • 14-day free trial ($50 in AI credits)

Custom AI Fleet

Let's talk
  • Unlimited AI Admin agents
  • Unlimited custom AI Employees
  • Unlimited custom deployments
  • Unlimited automation of business workflows
  • Dedicated AI Engineer

Build a Custom AI Agent: Frequently Asked Questions

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. Available on Vertical AI Employee (first month free, then $1/minute) and AI Workforce (priority, $0.75/minute, first month free). Don't want to build it yourself? Our team designs, builds and deploys your AI workforce end to end.

An AI agent builder is a service or platform that helps you create custom AI agents for your business. Modassembly's AI agent builder is a hybrid: a self-serve flow where an AI Admin (your own Claude agent) helps you scope and configure, combined with on-demand access to expert human AI engineers who pair with you in a chat group and architect, build and deploy your agent live. You get the speed of a tool with the depth of a consultancy.

You open a WhatsApp, SMS, Telegram, Slack or Teams group with an expert AI engineer. You describe what you want your agent to do; the engineer asks the questions that matter, sketches the architecture in the chat and shows you working components as they go. You see decisions in real time. The integrations get architected with you, not for you. When the agent is ready, we deploy with 1 click to the channels you choose.

Most small businesses go live in a day or two on Vertical AI Employee. The AI Admin handles the setup, and you can pair with an AI Engineer on-demand if you hit anything specific. For Custom AI Fleet plans with multi-agent orchestration, deep integration with legacy systems or custom widgets, expect one to four weeks with our engineering team, depending on scope.

Yes. The Vertical AI Employee plan ships with an AI Admin (a powerful Claude agent) that helps you scope, configure and deploy your AI Employee end to end. Most one-person operations and lean teams get going entirely through the AI Admin. When you hit something tricky, the AI Engineer on-demand is there to pair with you live.

You don't need them. The engineer-pairing model exists exactly for that. You describe what you want in plain language inside the chat group; the engineer translates that into architecture and code. The point is that we handle the technical work side-by-side with you, so you stay in control of what the agent does without having to write a line of code.

Either. Vertical AI Employee and AI Workforce include AI Engineer on-demand for live pairing, so you build with help. Custom AI Fleet is done-for-you: our team designs, builds, integrates and deploys your AI workforce end to end. Custom is the right choice when you have specialized requirements, legacy systems or want to skip the build entirely.

See the pricing section above for current plans. Vertical AI Employee starts at $35/month and includes the AI Admin, 1 dedicated AI Employee, 1-click channel deployment and AI Engineer on-demand (first month free, then $1/minute). AI Workforce adds 3 more AI Employees, agent-to-agent communication and priority AI Engineer access ($0.75/minute). Custom AI Fleet is let's-talk pricing for done-for-you. Every plan includes a 14-day free trial.

Custom Claude agents for every role in your business: customer service, executive assistant, bookkeeper, sales agent, marketing agent, data analyst, web developer, dispatcher and more. Each one is architected for your specific workflows, tools and channels. You can also build multi-agent setups where an AI Admin coordinates several specialized employees.

Yes. Your agent is yours, and it can keep evolving. The AI Admin can tweak behavior and prompts on the fly. For deeper changes (new integration, new workflow, new channel), you pair with an AI Engineer in your chat group and we add the change. On Custom AI Fleet plans we maintain and evolve the agent with you over time as part of the service.