Skip to content
Tekris Labs
All products

Developer Tools / MCP

Build MCP Apps & Agents

Build MCP tools and interactive apps for AI hosts.

A skills-only plugin for designing, building and testing Model Context Protocol servers, tool contracts and MCP App interfaces. It starts from an idea, API documentation or an existing MCP repository.

Open in ChatGPT

01 — The product

What is Build MCP Apps & Agents?

Build MCP Apps & Agents helps design, implement and test Model Context Protocol servers, tool contracts and host-aware interfaces. It works from a new idea, API documentation or an MCP repository you already have.

It’s for developers and teams who extend AI assistants with interoperable tools. One of its first decisions is whether a tool-only server is enough or whether the workflow benefits from a rendered MCP App interface.

Its workflows cover architecture, typed tools, resources, security, client compatibility, UI quality, debugging and release preparation. It writes and tests code only when the host provides real coding tools. Otherwise it gives you a plan you can act on.

02 — Real workflow

Turning a task-management API into an interactive MCP App

The problem

A team has a task-management REST API and wants people to browse and update tasks from inside an AI assistant. They haven’t decided which endpoints should become tools, or whether a UI is worth building.

API descriptionyaml
# Tasks API (excerpt)
GET   /projects/{id}/tasks   ?status=&assignee=
POST  /projects/{id}/tasks   { title, due, assignee }
PATCH /tasks/{id}            { status: open | done }
auth:  OAuth, scopes tasks.read and tasks.write
users: team leads triaging work in chat
hosts: ChatGPT

How Build MCP Apps & Agents approaches it

  1. 1Turns the API into a small set of focused tools, such as listing tasks and updating a task’s status. Each tool gets a typed schema, a permission scope and a readable response.
  2. 2Designs the server and decides whether a ui:// interface helps with browsing tasks, or whether tool-only responses are enough.
  3. 3Implements the interface and a tool-only fallback with current supported SDK patterns.
  4. 4Validates protocol behavior, security boundaries around write actions and client compatibility, where the host provides test tools.

Expected result

A structured MCP project with an optional interactive UI, plus integration or testing guidance based on evidence. Tests are reported as passed only when they actually ran.

Illustrative workflow. It doesn’t depict a real session, system, or result.

03 — Areas of expertise

Where it helps

  • MCP server design

    Chooses tools, resources, transports, schemas and response contracts, and keeps each tool focused, with a response people can read.

  • Interactive MCP Apps

    Designs interfaces that work inside the host’s sandbox, with useful loading, error and empty states, plus a tool-only fallback when a rendered UI doesn’t help.

  • Security and authentication

    Reviews authorization, permission scopes, external calls and sensitive tool actions.

  • Debugging and compatibility

    Investigates server failures, differences between hosts and SDK upgrades.

04 — Working with Build MCP Apps & Agents

What to provide and what to expect

Share

  • An idea, or a description of what the tools should do
  • API documentation or an existing MCP repository
  • The intended users and the actions they need
  • Supported hosts and any authentication requirements

Expect

  • Tool names, schemas and permission scopes
  • A server design with an optional ui:// interface
  • Implementation files and test results when the host supplies coding tools
  • A clear, actionable plan when it doesn’t

It’s a skills-only plugin. It has no hosted MCP service, no built-in code runner, no independent agents and no guaranteed deployment. Writing, running and testing code depend on the tools your host provides.