Google Opens Search and Android to Third-Party AI Agents Through Connected Apps
Executive Summary
Google turned the callable function into a distribution channel. Through the Connected Apps Platform, a Gemini or Search agent can complete a user's task inside a brand's app without a click-through, and entry costs one MCP integration, not a media budget. Transactional brands gain cheaper acquisition; affiliate, comparison and install-led models lose their click. Ship one revenue-linked function to the preview before year-end and measure it against paid-search CPA at 90 days.
The Signal
Google used its Android Dev Summit to open Android and Search to third-party AI agents on two fronts. For developers, Android Studio Rabbit 2 adds "Bring Your Own Agent" support through the Agent Client Protocol, letting more than 40 coding agents, including Anthropic's Claude Agent, OpenAI's Codex and Google Antigravity, run inside the IDE. For businesses, Google launched a preview of the Connected Apps Platform, which links apps to Search and the Gemini app through Android MCP or cloud-hosted MCP servers, managed from a single console. More than 50 partner integrations, including Adobe, Peloton and Experian, are already live in the Gemini app and reach web search in the coming weeks. Google also released the AppFunctions API in beta and an alpha Agentic API built on Gemini Nano 4 for on-device agents.
What Changed
Brands can now expose their services as callable functions inside Google's AI surfaces, so a user's Gemini or Search agent can execute a task in a brand's app, rendered in that app's own interface components, without a click-through to a website or app store. Discovery and transaction collapse into one agent-mediated step, and the entry ticket is a one-time MCP integration managed from a single console, not a media buy or an SEO position.
Why It Matters
Google just made the callable function a distribution channel, and it priced entry at one integration instead of a media budget. A brand that exposes its service through the Connected Apps Platform gets surfaced when a Gemini or Search agent decides it can complete the user's task. That decision runs on capability and trust signals, not bids, and not blue-link rank. What gets cheaper is acquisition for transactional categories where the user already knows the job to be done: rebooking, reordering, checking a score, pulling a credit report. Experian and Peloton sit in the first wave because their value is executable, not browsable. What gets devalued is everything that monetizes the gap between intent and action. Comparison layers, affiliate click-through, retargeting, and app-install campaigns all depend on a step the agent now removes. Rendering the brand's own UI components inside the agent softens the disintermediation, but brand presence shrinks to a widget the user never navigated to. The why behind the why is defensive. Google is watching third-party agents capture task execution and needs to be the layer those agents call through. Opening Android Studio to Claude and Codex is the same move aimed at developers: win the ecosystem by being the neutral rail. MCP is the toll road, and Google runs the console. The new competitive move is agent-readiness as a brand asset. Whoever registers reliable, well-described functions first trains the agent's default routing. Latecomers will be competing for the second slot in a one-answer interface.
Marketing Impact
martech
MCP server ownership becomes a martech workload. Stacks need a maintained layer exposing authenticated, well-described functions to Gemini and Search agents, plus monitoring for how agents call them. Expect the Connected Apps console to become a system of record that data, identity and CRM teams must govern jointly.
product marketing
Function descriptions are now positioning copy. The agent selects a brand from how its capabilities are named and scoped, so product marketing must own the schema language, the success criteria for each callable task, and competitive differentiation expressed in machine-readable terms rather than landing-page messaging.
ecommerce
Reorder, rebook and status-check flows can be exposed as agent-callable functions, skipping the storefront and app-store install. Conversion shifts from page optimization to task-completion reliability. Checkout, loyalty and fulfillment APIs need agent-grade uptime, because a failed call loses the transaction and the routing preference.
media
Retargeting, app-install and comparison-click budgets lose their anchor step as agents execute tasks without a click. Media teams should move a test slice of Q1 2027 spend from install and click-through formats toward capability readiness, and renegotiate affiliate and comparison partnerships whose value depends on that intent-to-action gap.
The Exploit
Opportunity
Transactional brands can now acquire customers through a one-time integration instead of a media budget. Any service with an executable job-to-be-done, such as rebooking, reordering, status checks or account pulls, can register callable functions in the Connected Apps Platform preview. Product and martech teams capture it by shipping two or three high-intent functions before Q1 2027 planning locks.
Risk
The platform is a preview, and Google controls the console and the routing logic. Exposing functions creates security and fraud surface, and brand presence shrinks to a widget. Engineering spent now may need rework when MCP specifications or ranking rules change.
The Move
Have the head of digital product, with marketing ops as co-owner, ship one revenue-linked function, your highest-frequency repeat task, to the Connected Apps Platform preview before year-end. Checkpoint at 90 days: measure agent-initiated completions and revenue per invocation against paid-search cost per acquisition, then decide on expansion in Q1 2027 budgets.
First-Mover Advantage
Gains
Early registrants train the agent's default routing for their task category. They collect first-party invocation data competitors lack, and they set the function descriptions and trust signals that later entrants must outrank for the second slot in a one-answer interface.
Risks
The platform is a preview, and Google controls the console and the routing logic. Exposing functions creates security and fraud surface, and brand presence shrinks to a widget. Engineering spent now may need rework when MCP specifications or ranking rules change.
Window
Roughly two to three quarters, until about mid-2027. The window closes when Google exits preview and default routing hardens, or when the first rival in your category appears as the named answer in Gemini or Search.
Winners & Losers
Winners↑
Transactional app owners in task-driven categories
Brands like Experian and Peloton sell executable value, such as pulling a credit report or starting a class, and the Connected Apps Platform lets a Gemini or Search agent complete that task inside their app without a click-through. Entry costs one MCP integration, not a media budget, so acquisition cost in these categories drops sharply for early registrants. Prioritise the three to five highest-frequency user jobs, expose them as well-described functions, and instrument completion rates now, before the console fills with competitors.
Agent-ready product and martech teams
Surfacing is decided by whether the agent can reliably complete the user's task, so function descriptions, latency, error handling, and A2UI-rendered interfaces become acquisition levers. Teams that treat their MCP and AppFunctions layer as a product, with owners, SLAs, and testing, will earn default routing in a one-answer interface. Stand up a cross-functional agent-readiness squad spanning product, engineering, and marketing this quarter, because the second slot will be worth far less than the first.
First-party data and loyalty-rich brands
Agents execute best where they can act on account state: order history, memberships, saved preferences. Brands with authenticated user bases can offer personalised completion that anonymous competitors cannot, which strengthens their trust signal in agent routing. Connect the integration to loyalty and CRM data so the agent-mediated step deepens the relationship rather than just closing a transaction.
Google as the neutral agent rail
By opening Android Studio to Claude Agent and Codex and routing brand functions through a single Connected Apps console, Google positions itself as the layer third-party agents call through, not the layer they bypass. That secures distribution leverage over brands even as discovery moves from ranked links to executed tasks. Marketers should treat the console as a new Google-controlled channel with its own gatekeeping, and negotiate visibility and attribution terms early while partner counts are small.
Losers↓
Affiliate and comparison-layer publishers
These businesses monetise the gap between intent and action, and an agent that completes the task inside the brand's app removes the click that carried the commission. Rebooking, reordering, and lookup categories are exposed first, since the user already knows the job to be done. Defence means moving toward categories where judgment still precedes action, such as high-consideration purchases, and toward original testing and expertise an agent cannot synthesise from a function call.
App-install and retargeting-dependent performance teams
Install campaigns and retargeting assume the user must navigate to the app, and the Connected Apps Platform renders the brand's functionality in Gemini and Search with no install or session start. Cost-per-install and return-on-ad-spend benchmarks will degrade as agent-executed tasks displace owned-app sessions. Shift budget toward agent-readiness and re-baseline measurement around completed tasks, since the install and the visit are no longer the unit of acquisition.
Late-moving brands with undifferentiated services
Agent routing builds defaults from reliability and trust signals, so brands that register late inherit the second slot in an interface that returns one answer. Without differentiated functions, they compete on price or lose the task entirely, and they lack the user data to personalise execution. Their only defence is speed: ship a minimal, dependable integration for the top use case before the first-wave partners harden their routing advantage.
Strategic Outlook
Expect the Connected Apps Platform to leave preview by mid-2027, with a rapid expansion of partner integrations past the initial 50 as categories with executable value (travel, fintech, fitness, retail reordering) race to register. Google will add ranking, quality and trust signals to the console before anyone calls it a marketplace, and those signals will become the new optimization target, a GEO-style discipline for agent routing. Apple, Microsoft and OpenAI will answer with competing function registries; MCP support across them is the likely hedge. The precedent is early app-store featuring and voice-assistant skills, with one difference: skills never had transactional intent attached. Brands that register early get disproportionate routing share while the agent is still learning defaults. Expect measurement vendors to ship agent-attributed conversion reporting in 2027, and expect the first public disputes over agents favoring Google-affiliated services.