The Model Context Protocol (MCP) is an open software standard for connecting AI applications to systems that provide data and tools. Calling it the “USB-C port for AI” is a metaphor for interoperability: MCP is not a physical port, and adopting it does not make every application automatically compatible with every service.
What MCP standardizes
MCP defines a common way for an AI application to communicate with a server that exposes capabilities or information. The application’s host manages the connection and decides how to make those capabilities available to a model. Instead of building a separate, bespoke integration for every model-and-service pairing, developers can implement MCP on the host side, the server side, or both.
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The protocol describes how these components exchange messages and advertise capabilities. It does not decide whether a user is allowed to perform an action, whether a server is reputable, or whether a model should act without confirmation. Those decisions belong to the application and its security controls.
Three server primitives, three control roles
The official MCP server overview groups server capabilities into prompts, resources, and tools. The distinction helps clarify who initiates or controls their use:
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- Prompts: reusable templates or instructions that a user can choose to invoke, such as a prepared workflow.
- Resources: contextual data that an application or client can manage and attach to a model interaction, such as a document or other information exposed by a server.
- Tools: executable functions a model can request, such as searching for information or carrying out an operation.
These roles describe the interaction pattern, not the safety level. A tool that reads information and a tool that changes an external system are both tools; the host still needs to decide what to allow and when to ask the user.
What “the USB-C port for AI” gets right—and what it doesn’t
The analogy captures MCP’s aim: a shared interface can reduce the need for every AI application and service to invent a different connection format. It can make components easier to combine when both sides implement compatible versions and capabilities.
But a standard is not an automatic adapter. A host must implement the protocol, a server must expose the needed capability, and both must agree on compatible behavior. An MCP connection also does not guarantee that every server supports every primitive, that a particular client supports the latest revision, or that the resulting integration is safe. MCP is software, not a USB-C connector, cable, adapter, or other product to buy.
What changed in the 2026-07-28 base revision
The latest published base specification identified in the official MCP material as of October 5, 2026 is revision 2026-07-28. The MCP maintainers’ release article describes its most consequential change as making the protocol layer stateless.
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Requests no longer depend on a protocol session
In this revision, the initialize/initialized exchange and the Mcp-Session-Id header are retired. Each request carries protocol-version, client-identity, and capability information in metadata. Servers can optionally expose capability discovery through server/discover.
This design allows requests to reach different server instances behind a conventional round-robin load balancer without requiring shared storage for MCP protocol sessions. It does not mean an application cannot have state: an application can retain its own state and pass a handle between calls. The change is specifically to protocol-level session handling.
HTTP routing and caching get more explicit signals
For Streamable HTTP, requests use Mcp-Method and Mcp-Name headers. Gateways can use these signals to route or meter requests without first parsing the JSON body. Responses for several list and read methods carry ttlMs and cacheScope hints that clients can use when deciding how to cache results.
Operations can request user input; Tasks move to an extension
Multi Round-Trip Requests cover operations that need a user response before continuing: a server can return input_required, and the client can retry with inputResponses. Tasks, which had been experimental in the core, moved to an extension. Its polling methods include tasks/get and tasks/update; support for the extension should be checked separately from support for the base specification.
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Some older features and transport are deprecated
The release lists Roots, Sampling, Logging, and legacy HTTP+SSE as deprecated. It says deprecated functionality will continue for at least twelve months and describes a year-long off-ramp for the old transport. That is a transition window, not a reason to assume every host or server has already migrated.
How to assess an MCP implementation
The right deployment depends on what needs to connect and which capabilities, transport, and controls the participating software supports. Local and remote describe deployment choices, not different guarantees of safety or compatibility.
| Decision | What to check | Why it matters |
|---|---|---|
| Local or remote | Whether the integration uses a process-local, stdio-style connection or a remote HTTP-based deployment, and which protocol revision each endpoint supports. | The deployment affects how the host reaches the server; it does not by itself establish compatibility or trust. |
| Needed capabilities | Whether the use case needs prompts, resources, tools, an extension such as Tasks, or a combination. | Implementations may expose different capabilities even when they use MCP. |
| State and scaling | Whether the implementation relies on older protocol sessions or the stateless request model introduced in 2026-07-28; identify any application state and how it is passed. | Protocol session behavior and application state are separate concerns. |
| Authorization and trust | Issuer validation, credential scope and binding, server identity, user-approval flow, and treatment of externally supplied content. | A successful protocol connection is not evidence that a requested action is authorized or that a server is trustworthy. |
| Compatibility and migration | The host, server, and SDK versions; support for older behavior; and use of deprecated methods or transports. | A published protocol revision does not mean every installed client or server has adopted it. |
Security: transport, authorization, and trust are separate
For a safe deployment, distinguish three questions: what information or requests MCP carries, what the host authorizes, and whether the server or content should be trusted. The protocol provides a communication structure; it does not answer all three questions for an application.
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The 2026-07-28 release hardens authorization handling. Authorization servers should return the iss parameter specified by RFC 9207, and clients must validate it before redeeming an authorization code. Client credentials are bound to the issuer that minted them.
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The revision formally deprecates Dynamic Client Registration (DCR) in favor of Client ID Metadata Documents (CIMD), while retaining DCR for backward compatibility. Implementers should follow the mechanism supported by their actual client and authorization server rather than assuming all deployments have switched.
Skills served through MCP require particular care
The separate official Skills extension specification applies to base revision 2026-07-28 or later. It treats remote skill instructions as untrusted input. Hosts are required to verify listed file digests and sizes, expose the content’s origin, and require an explicit approval process before loading or executing skill content.
A matching digest shows that a file is consistent with the listing; it does not prove the server or the content is trustworthy, because the server supplies both. This guidance concerns the Skills extension specifically—it should not be generalized into a claim that every MCP resource is a skill.
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Migration: check the versions you actually run
Migration planning should start with the host, server, and SDK in the deployment, not just the date of the latest specification. The official TypeScript SDK documentation identifies its v2 line as the stable SDK release implementing revision 2026-07-28 and describes server, client, upgrade, and framework-integration paths. That does not establish that another SDK, host, or installed integration supports the same revision.
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- Inventory each component. Record the protocol revision and SDK version supported by the host, each server, and any relevant extensions.
- Identify retired session behavior. Check whether code expects the
initialize/initializedexchange or relies onMcp-Session-Id. For the new stateless model, ensure each request includes the required metadata and handle application state separately. - Review transport assumptions. If using Streamable HTTP, verify handling of
Mcp-MethodandMcp-Name. If using legacy HTTP+SSE, plan against its announced deprecation and the stated transition period. - Check capability and extension dependencies. Confirm whether optional discovery, Multi Round-Trip Requests, or the Tasks extension are supported end to end. Do not treat an extension as part of the base protocol merely because a server implements it.
- Test authorization and approval paths. Validate issuer checks and credential binding, and confirm how the host presents approval decisions for actions and any externally supplied skill content.
The MCP maintainers’ July 28, 2026 release article describes the revision as a major step toward scalable, routable, cacheable deployments. That is the release’s stated direction; it is not a guarantee that a particular implementation is production-ready or secure without appropriate configuration and testing.
Adoption figures and roadmap claims need attribution
In the July 28, 2026 release article, MCP maintainers reported close to half a billion Tier 1 SDK downloads per month and more than one billion total downloads each for the TypeScript and Python SDKs. The release material does not establish these as independently audited figures, so they are best read as maintainer-reported ecosystem context rather than a measure of active users or deployed production systems.
The official roadmap published August 22, 2026 names agentic messaging, transport hardening, agent identity, improved primitives, and SDK developer experience as priority areas. These are roadmap priorities, not confirmation that those features are already in the 2026-07-28 base specification.
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Is MCP a product you can buy?
No. MCP is a software protocol. The USB-C comparison is figurative, so a cable, adapter, generic computer, or other physical accessory is not a meaningful MCP recommendation. The practical choice is whether the software you intend to connect supports compatible MCP capabilities and has suitable authorization, approval, and trust controls.
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