Google Connected Apps Platform Explained: What Developers Can Build for Search and Gemini

• Google's Connected Apps Platform is a preview program for building and managing integrations that can work across Google Search and the Gemini app.
• Developers can use a remote MCP server for broader web, Android, and iOS reach, or Android MCP through AppFunctions for deeper on-device experiences.
• Access is phased, so teams should evaluate permissions, authentication, testing, review requirements, and product availability before committing to a full launch.

What is Google’s Connected Apps Platform?

Google’s Connected Apps Platform is a new preview system that gives developers one place to build, test, register, and manage app integrations for Google Search and the Gemini app. Google announced it on October 28, 2026, describing it as a way to build once and reach users across multiple Google products.

The important distinction is that this is more than a listing of apps that Gemini can open. A connected app can expose authorized data and actions so users can ask for information or complete tasks inside a Google experience. Depending on the integration, that could mean checking an account, searching personal data, booking something, updating a project, or carrying out another clearly defined action.

However, the platform is still in preview. Google says access is opening in phases, with more developers, markets, and Google products expected over the coming months. That means the platform is worth evaluating now, but it should not yet be treated as a universally available production channel.

How the integration works

The basic flow is conversational. A user connects an app, grants the permissions required for its tools, and then asks Gemini or another applicable Google product to retrieve information or perform an action. The connected app supplies the capability, while Google’s product provides the conversational interface and context.

Developers expose those capabilities through one of two main paths:

• Remote MCP server: A public HTTPS server that follows Google’s Connected Apps MCP requirements. This is the recommended default for foundational capabilities that should work across the web, Android, and iOS.
• Android MCP through AppFunctions: An Android-focused option for exposing native app functionality and using device-level context. It is better suited to experiences that depend on the current state of an Android app or need tighter operating-system integration.

MCP stands for Model Context Protocol. In practical terms, it provides a structured way for an AI client to discover a service’s tools, understand their inputs, and request approved operations. It does not mean that Gemini automatically receives unrestricted access to an entire backend. Developers choose which tools and data to expose, and the integration still depends on authentication, permissions, safety annotations, and review.

What developers can manage in Google Connected Console

Google Connected Console is the management layer for the preview. According to Google’s developer documentation, teams can use it to connect an MCP server, choose where the app will be available, configure its public-facing identity, manage testers, analyze usage, version the integration, and submit it for review.

A typical setup involves more preparation than simply pasting in an API endpoint. Developers should expect to provide or verify:

• A public HTTPS MCP endpoint that Google can reach.
• Ownership of the domain hosting the service.
• Authentication and OAuth details where user authorization is required.
• A privacy policy and terms of service URL.
• An app icon, description, capabilities, and example prompts.
• Tool definitions with clear schemas and safety annotations.

Google also lets developers select which tools are enabled and whether a tool needs contextual signals such as the user’s language, approximate location, or precise location. That choice matters. Requesting additional context can make an integration more useful, but it also increases the privacy and review burden. A location permission should have a specific, defensible purpose rather than being enabled simply because it might be useful later.

Remote MCP or Android AppFunctions: which path makes sense?

The two integration paths are complementary, not interchangeable. Choosing the wrong one early could create extra work later because Google’s registration flow treats the connection type as a fundamental part of the connected app.

For example, a project-management company that wants users to search tasks and create updates from Gemini may start with a remote MCP server. A mobile app that needs Gemini to interact with local device features or the current app state may have a stronger reason to use AppFunctions.

Some companies may eventually support both, but the initial product decision should be based on where the important action happens. If the capability lives primarily in a cloud service, remote MCP is the more natural starting point. If the value depends on Android’s local context, the Android route deserves closer attention.

Permissions, safety, and user control are central

Connected apps can read information, write changes, or trigger actions on a user’s behalf. That makes permission design just as important as the technical connection.

Google’s guidance asks developers to distinguish read-only operations from state-changing or destructive actions. Tool schemas should clearly describe required parameters, allowed values, authentication needs, and expected results. Developers can also configure whether certain operations require confirmation before execution.

This is especially important for actions such as placing an order, changing an account setting, deleting information, or making a reservation. A well-designed integration should make the action understandable before it happens, avoid broad permissions when a narrow one is enough, and return a useful result if the operation fails.

Users also need a clear way to disconnect the service. Google’s developer-mode documentation says users can disconnect a custom MCP server from their Connected Apps settings or remove its connection through their Google Account controls. For developers, that means account linking and revocation should be treated as part of the product experience rather than an afterthought.

Testing happens before publication

Google provides Gemini Apps Developer Mode as a debugging and evaluation workspace. Developers can connect a registered app or test a deployed HTTPS MCP endpoint directly, then inspect tool calls, response payloads, HTTP status codes, execution latency, and schema behavior.

The workspace also includes simulated context controls. Teams can test how their tools behave with different dates, times, and language settings without changing the development machine. Authentication flows and safety prompts can be checked before the app is submitted for review.

Unpublished connected apps are limited to approved testers. Google’s current documentation says testers must use Gmail accounts, and it may take up to 10 minutes for a newly added tester to see the app. That restriction is useful for controlled testing, but it also means teams need a realistic plan for gathering feedback before public availability.

What the October 2026 preview does—and does not—promise

The announcement positions the platform as a unified way to reach high-intent users in Search and Gemini. Google also says that more than 50 connected apps have launched across those experiences, with partners in areas such as productivity, health, fitness, ticketing, and creativity.

That does not guarantee that every connected app will appear in both products immediately. Developers choose whether to target Search, the Gemini app, or both, and availability depends on Google’s rollout, review, product support, and market coverage. Google has not published a complete public country-by-country availability table for the preview, so teams in the United States and Canada should confirm the destinations offered during onboarding rather than assume identical access.

The platform also does not remove the need for a strong product case. An integration that merely repeats a website’s navigation may offer little value. The better candidates have a clear beginning and end: finding a relevant account record, comparing live options, creating a document, making a booking, checking a status, or completing another task that benefits from natural-language interaction.

Should your team invest in it now?

The Connected Apps Platform is worth a structured technical evaluation if your service already has secure APIs, clear user permissions, and actions that people naturally express in conversation. It is less compelling if your product depends on complicated visual workflows, has weak authentication controls, or cannot define safe, predictable tool behavior.

Before committing significant engineering time, use this checklist:

1. Identify two or three high-value tasks that users can complete through conversation.
2. Decide whether a remote MCP server or Android AppFunctions better matches where the work happens.
3. Review your OAuth, privacy, domain verification, and account-revocation flows.
4. Design narrow tools with strong schemas and explicit read-only or destructive annotations.
5. Test natural-language prompts, direct app mentions, authentication, confirmations, failures, and latency.
6. Confirm which Google products, markets, and preview controls are actually available to your account.
7. Keep the integration modular so product changes or a broader rollout do not require rebuilding the entire service.

The practical opportunity is real, but the preview rewards preparation. Teams that treat Connected Apps as a secure product surface—not simply another AI plug-in—will be better positioned to learn from early access without overcommitting to assumptions Google has not yet confirmed.

Helpful Links

• Google Connected Apps Platform – Review Google's platform overview, integration options, preview onboarding, and core developer resources.
• Google Connected Apps Platform announcement – Read Google's October 28, 2026 announcement about building and managing connected apps for Search and Gemini.
• Create and manage Connected Apps in Google Connected Console – Review the official registration, configuration, tester, publishing, and troubleshooting workflow.
• Connected Apps Platform MCP server developer guide – Learn how to build, validate, deploy, authenticate, and test a remote MCP server.
• Gemini Apps Developer Mode – Inspect tool schemas, authentication, simulated context, execution events, and debugging controls.
• OAuth 2.1 implementation guide – Official page referenced in the article.

Frequently Asked Questions

Q. Is the Google Connected Apps Platform available to every developer yet?

A. No. Google announced it as a preview on October 28, 2026, with access opening in phases. More developers, markets, and Google products are expected over time, but Google has not published a complete country-by-country availability list.

Q. Does a connected app automatically work in both Search and Gemini?

A. No. Developers choose the Google products where the app should be available, and each destination may have separate rollout, review, or availability conditions.

Q. What is the difference between MCP and AppFunctions?

A. A remote MCP server is the broader cross-platform option for cloud services and capabilities that may work across the web, Android, and iOS. AppFunctions is Google’s Android MCP path for deeper, more local integration with Android apps and device context.

Q. Can developers test a connected app before publishing it?

A. Yes. Google provides Gemini Apps Developer Mode for inspecting tool calls, schemas, authentication, latency, simulated context, and failures. Unpublished apps can also be shared with approved testers, although Google’s current documentation says those testers must use Gmail accounts.

Q. What should a developer prepare before applying for preview access?

A. Prepare a public HTTPS endpoint, domain verification, authentication details, privacy and terms pages, app metadata, tool schemas, safety annotations, example prompts, and a testing plan. The exact preview access and product availability shown during onboarding may vary.