LLM Intentions

An open protocol and toolkit for turning Android apps into MCP tool servers, using Android Intents as the native routing layer.

Status: Alpha — Running in production on a real device. Self-explanatory tool failures via the Wave 2 envelope. Multi-CapApp Hub.

What is this?

LLM Intentions introduces a new kind of Android app: the CapApp (Capability App). A CapApp has no traditional UI. It exists purely to expose capabilities to LLMs via the Model Context Protocol (MCP). Any developer can build one.

The Hub is the central gateway. It discovers installed CapApps via Android Intents, aggregates their tools into a single MCP endpoint, and namespaces them by source. Connect any MCP client — Claude, Grok, a custom agent — and your phone becomes an AI-native device.

This isn't a spec or a proposal. It's a working system.

Coming next: Intent Mesh — an experimental protocol for routing work between multiple LLMs on the same device. Early scripts and a draft spec are included in this repo.

Self-explanatory tool failures

Every tool response on LLM Intentions renders as a canonical envelope:

OK: contacts_search returned 3 contacts

[
  { "name": "Ada Lovelace", "phone": "+1..." },
  ...
]

FAIL: notify.post failed: SecurityException
Hint: Grant POST_NOTIFICATIONS in Settings → Apps → Notify

Raw:
{ "type": "SecurityException", "message": "..." }

The Hint: line comes from the tool's toolMetadata { failureMode(pattern, hint) } block — a regex matched against the thrown exception. When a permission is denied, an API rate-limits, or a sensor isn't on this device, the LLM sees an actionable hint instead of a stack trace.

CapApp authors get this for free: throw on hard errors, declare a failureMode for each known failure shape, and the framework formats the envelope. See AGENTS.md for the full author contract.

Architecture

┌─────────┐    ┌─────────┐    ┌─────────┐    ┌─────────┐
│  Files  │    │ Notify  │    │ People  │    │  Your   │
│  CapApp   │    │  CapApp   │    │  CapApp   │    │  CapApp   │
└────┬────┘    └────┬────┘    └────┬────┘    └────┬────┘
     │              │              │              │
     └──────────────┼──────────────┼──────────────┘
                    │  Android Intents
                    │
     ┌──────────────▼──────────────────────┐
     │         Hub (port 8379)             │
     │    MCP Gateway / Tool Aggregator    │
     │                                     │
     │  ┌───────────┐  ┌────────────────┐  │
     │  │ Discovery │  │  Namespace     │  │
     │  │  Engine   │  │  Router        │  │
     │  └───────────┘  └────────────────┘  │
     └──────────────┬──────────────────────┘
                    │ MCP (streamable-http)
                    ▼
            ┌───────────────┐
            │  MCP Client   │
            │ Claude / Grok │
            │ / Any Agent   │
            └───────────────┘

Intent Mesh — Multi-LLM Routing (Experimental)

Status: Early experiment. The scripts work but the workflow is manual and rough. Included as a draft spec and proof of concept for where this is heading.

┌──────────────┐   PROCESS_TEXT    ┌──────────────┐
│    Claude    │ ──── Intent ────> │     Grok     │
│  (Taichi TA) │                   │ (X Firehose) │
│              │ <── Clipboard ─── │              │
└──────────────┘    or xAI API     └──────────────┘
         │                                │
         └────── Intent Mesh ─────────────┘
              Synthesized Alpha Signal

The idea: each LLM contributes what it's best at. Claude runs technical analysis via Taichi. Grok reads real-time X/Twitter sentiment. Intent Mesh merges both. Not production-ready yet, but the concept is proven.

What's a CapApp?

A CapApp is an Android APK that:

1. Exposes MCP tools via Android Intents — no REST API, no server process needed
2. Registers with Hub — Hub discovers it automatically via the AndroidMCP protocol
3. Has no UI — it's a headless service that exists to be called by LLMs
4. Runs natively — full Android API access (files, contacts, notifications, sensors, etc.)

Think of it like a microservice, but instead of HTTP endpoints, it exposes LLM tools. Instead of a container, it runs as an Android app.

Example CapApps (included)

Built-in Hub Tools

Termux bridge

termux-mcp is a separate Node.js MCP server that exposes Termux's APIs (battery, camera, location, SMS, sensors, etc.) under the termux.* namespace. It runs alongside the Hub and shares the same envelope wire format.

Platform Support

Both versions expose tools over MCP via wifi, so your MCP client can talk to tools on any device on the network. Same protocol, native IPC on each platform.

How It Differs from mobile-mcp

Quick Start

Prerequisites

• Android device with Termux installed
• Termux:API addon
• Node.js (pkg install nodejs in Termux)
• LLM Intentions Hub APK installed
• One or more CapApp APKs installed

1. Install termux-mcp

# In Termux
cd ~
git clone https://github.com/dreliq9/llm-intentions.git
cd llm-intentions/termux-mcp
npm install

2. Start the servers

# Terminal 1: termux-mcp (exposes Termux APIs as MCP tools)
node server.js

# Terminal 2: hub-proxy (bridges Hub to MCP clients on :8381)
node hub-proxy.js

3. Connect your MCP client

Add to your MCP client config (e.g., ~/.mcp.json):

{
  "mcpServers": {
    "hub": {
      "type": "http",
      "url": "http://127.0.0.1:8379/mcp"
    }
  }
}

4. Verify

Call hub.status — you should see all discovered CapApps and their tool counts.

Build Your Own CapApp

See the CapApp template for a skeleton you can fork.

See AGENTS.md for the canonical author contract — the textTool / envelopeTool helpers, the toolMetadata DSL, and the antipatterns to avoid.

See spec/capapp-protocol.md for the full registration and discovery protocol.

Project Structure

llm-intentions/
├── README.md                 # You are here
├── ARCHITECTURE.md           # Detailed system design
├── AGENTS.md                 # Contract for LLMs and CapApp authors
├── FUTURE.md                 # Roadmap and in-flight work
├── LICENSE                   # Apache 2.0
├── mcp-core/                 # Pure-JVM core: Envelope, ToolRegistry, DSL
├── mcp-intent-api/           # Android lib: ToolAppService, IPC
├── llm-intentions/           # Hub APK
├── tool-device/              # Device sensors, TTS, clipboard CapApp
├── tool-notify/              # Notifications CapApp
├── tool-people/              # Contacts + calendar CapApp
├── tool-files-dev/           # Filesystem CapApp
├── taichi-android/           # Paper crypto trading CapApp
├── termux-mcp/               # Node.js MCP server for Termux APIs
├── hub/                      # hub-proxy Node passthrough
├── intent-mesh/              # Multi-LLM routing (experimental)
├── capapp-template/          # Skeleton for building new CapApps
├── spec/
│   ├── capapp-protocol.md      # How CapApps register and expose tools
│   └── intent-mesh.md        # Multi-LLM routing protocol
└── docs/
    └── prior-art-log.md      # Discovery timeline and prior art

Income & Commercial CapApps

The LLM Intentions ecosystem supports both open source and proprietary CapApps. The protocol is open — build a CapApp, keep it closed, sell it. The Hub doesn't care.

For commercial integration or custom CapApp development, open an issue or reach out.

License

Apache 2.0 — see LICENSE. Includes an explicit patent grant.

Acknowledgments

Built on Model Context Protocol (MCP) by Anthropic.