These are different parts of an experience
A custom GPT is a configured experience inside ChatGPT. It can combine instructions, supplied knowledge and supported capabilities. A connected app provides access to an external service. MCP is a protocol an application can use to expose context and tools to compatible clients. A GPT and an MCP server are therefore not two identical products to compare feature for feature.
Choose from the work you need to do
Scroll the table to read every column. With a keyboard, use the left and right arrow keys.
| Need | Approach to examine | The important question |
|---|---|---|
| A repeatable explanation from supplied material | A configured GPT with maintained knowledge. | Who updates the material when the procedure changes? |
| Consult or act in an existing service | The connected app offered for that service. | Does it expose the operation with the right user permissions? |
| An ongoing customer workflow across sources | A business environment with configured connections and MCP access. | Where is the relationship maintained, and who runs the integration? |
A document answer and a live customer answer are different
“What is our returns procedure?” can rely on a maintained reference. “What did we promise this customer yesterday?” needs the relevant exchange and the right identity. “Prepare the next appointment” adds an action, availability and authorization. Describe these three situations separately before choosing technology.
A connection does not create missing history. It also does not decide which internal procedure should be shared with a contractor or which client can see a document. Those choices belong to the company and must be implemented in the underlying services and access rules.
What your own MCP domain changes
An address such as ai.yourcompany.com identifies the access point configured for your environment. Compatible assistants can use the operations exposed there according to the deployed authentication and authorization. The domain is a recognizable entry point; it is not, on its own, evidence of data residency, isolation or unrestricted compatibility.
What to include in the project brief
- The questions employees and customers should be able to ask.
- The sources, their freshness and what happens when information is missing.
- The identity and permissions for employees, contractors and identified customers.
- The difference between a public catalogue and a private customer record.
- The actions, approval rules, interfaces and maintenance responsibilities.
An environment shaped around the company
AlefOS provides the shared foundation for customer context, team knowledge and configured actions. The project defines how those capabilities are presented under the company’s brand and connected to its work. The team can use a compatible assistant and the agreed web interfaces; it does not have to treat each capability as an unrelated product.
Start with one complete journey: receive a request, keep its context, identify the next person and prepare the follow-up. Test that journey before extending the scope. Provider availability and account conditions must be checked for the assistant and connection chosen.