Reference / Plain-English glossary
Use the same words the same way.
These are the few technical words you may hear while using MCP, Xnurta, Amazon advertising, marketplace operations, and reporting.
MCP, in everyday language
| Term | Plain-language meaning | Marketplace example |
|---|
| Host | The AI app where the conversation happens. | Your team's approved AI workspace. |
| Client | The connection from the app to one service. | The link from the AI app to Xnurta. |
| Server | A focused service that provides information or actions. | Xnurta's published MCP service. |
| Tool | A named operation the service can perform. | A look-up such as get_ads_perf. |
| Resource | Information or a document the service makes available. | A saved source document or structured reference. |
| Prompt | A reusable question pattern. | A template for asking for a clear comparison. |
| Transport | How messages travel between the app and the service. | The way a remote service receives a request. |
| Capability | Something the service knows how to do. | Whether it can provide tools, documents, or updates. |
| Authority | Which system's record to trust for a particular question. | Ads, stock, and margin may each have a different source to trust. |
| Provenance | Where a number came from and when you got it. | Source, account, dates, how current it is, and the look-up used. |
Words for the work
| Term | Use it to mean | Do not imply |
|---|
| Read | Look at information you are allowed to see. | Permission to change a campaign or listing. |
| Recommendation | A suggested response supported by facts and stated assumptions. | An action already approved or completed. |
| Change set | A short list of proposed changes that someone can review. | A live change in an account. |
| Freshness | How current and complete the information is. | Proof that the information is always right. |
| Reconciliation | Comparing the numbers, dates, and surrounding details before deciding. | Extra polish after the answer is done. |
| Metric contract | The shared definition of a number, including its source and limits. | A label that means something different for every client. |
| ASIN | Amazon's ID for a product. | A campaign or a sales result. |
| ACOS | Ad cost compared with ad sales. | The same thing as profit margin. |
| ROAS | Sales earned for each dollar spent on ads. | Proof that the campaign made money after all costs. |
Primary reference: MCP architecture specification. The short definitions above are teaching language for this practice course.