--- title: I Turned My App Into an MCP Server With AppFunctions description: AppFunctions is a new Jetpack alpha library that lets Android apps expose typed Kotlin functions to on-device AI agents via an on-device MCP server. Using the... canonical: https://daily.dev/posts/i-turned-my-app-into-an-mcp-server-with-appfunctions-obvdzedvl twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: I Turned My App Into an MCP Server With AppFunctions | daily.dev og:description: AppFunctions is a new Jetpack alpha library that lets Android apps expose typed Kotlin functions to on-device AI agents via an on-device MCP server. Using the... og:url: https://daily.dev/posts/i-turned-my-app-into-an-mcp-server-with-appfunctions-obvdzedvl og:image: https://api.daily.dev/og/posts/OBVdzeDVL.png og:image:alt: I Turned My App Into an MCP Server With AppFunctions og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # I Turned My App Into an MCP Server With AppFunctions **[Medium](https://daily.dev/sources/medium_js)** · 10 min read · 2 upvotes · 0 comments ## Summary AppFunctions is a new Jetpack alpha library that lets Android apps expose typed Kotlin functions to on-device AI agents via an on-device MCP server. Using the @AppFunction annotation and KSP compiler, functions are indexed by the OS and callable by agents like Gemini without screen scraping or accessibility hacks. Key implementation details include: AppFunctionContext as the mandatory first parameter, @AppFunctionSerializable for boundary types, using typed AppFunction exceptions for agent self-correction, Hilt integration via AppFunctionConfiguration, and verifying discoverability with adb. A critical insight is that KDoc comments become the agent's prompt for tool selection, so writing intent-based descriptions with user examples dramatically improves routing accuracy. Security guidance covers exposing verbs not raw data access, validating all arguments, and avoiding destructive operations. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [AppFunctions: Making Your Android App Discoverable by AI Agents](https://daily.dev/posts/appfunctions-making-your-android-app-discoverable-by-ai-agents-geqm1p9pu) · ProAndroidDev · 1 upvotes · 0 comments - [Build intelligent Android apps: Integrate into Android's intelligence system using AppFunctions](https://daily.dev/posts/build-intelligent-android-apps-integrate-into-android-s-intelligence-system-using-appfunctions-zbvvmxmje) · Android Developers Blog · 1 upvotes · 0 comments --- Tags: [#android](https://daily.dev/tags/android), [#ai-agents](https://daily.dev/tags/ai-agents), [#kotlin](https://daily.dev/tags/kotlin), [#mcp](https://daily.dev/tags/mcp) [View this post on daily.dev](https://daily.dev/posts/i-turned-my-app-into-an-mcp-server-with-appfunctions-obvdzedvl) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"I Turned My App Into an MCP Server With AppFunctions","url":"https://daily.dev/posts/i-turned-my-app-into-an-mcp-server-with-appfunctions-obvdzedvl","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/i-turned-my-app-into-an-mcp-server-with-appfunctions-obvdzedvl"},"datePublished":"2026-07-23T17:14:13.860Z","dateModified":"2026-07-23T20:18:34.715Z","description":"AppFunctions is a new Jetpack alpha library that lets Android apps expose typed Kotlin functions to on-device AI agents via an on-device MCP server. 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