feat(mcp): Add Model Context Protocol (MCP) Client Bridge & Apple-Inspired UI Polish

[Tyleraltight]

feat(mcp): Add Model Context Protocol (MCP) Client Bridge & Apple-Inspired UI Polish

Overview & Value Proposition

This PR introduces native Model Context Protocol (MCP) client capabilities into big-AGI, bridging web-based conversational intelligence with local and remote MCP tool ecosystems (such as Desktop Automation via FastMCP + AutoHotkey v2). In addition, it elevates the core user experience with fluid Apple Design & Emil Kowalski Design Engineering micro-interactions.

---

System Architecture

                    ┌─────────────────────────────────────────────────────────────┐
                    │                   big-AGI (Next.js / Joy UI)                │
                    │                                                             │
[Visual / UX] ──────►  - Apple-inspired Liquid Glass & Segmented Controls         │
                    │  - Emil Kowalski 0.97x tactile press & critically damped anim│
                    │  - MCP Desktop Agent Live Status Indicator                  │
                    │                                                             │
                    │  [ User Prompt / Autonomous Agent Tasks ]                   │
                    │                      │                                      │
[AIX MCP Bridge] ───►  [ AIX Core Dispatcher ] ───► (Tool Discovery & Execution) │
                    └──────────────────────┬──────────────────────────────────────┘
                                           │
                                           ▼ (SSE Transport: /sse)
                    ┌─────────────────────────────────────────────────────────────┐
                    │                   FastMCP Tool Servers / AHK                │
[OS Execution] ─────►  - Standard Model Context Protocol (MCP) Server             │
                    │  - OS-level execution (e.g. desktop clicks, typing, launch) │
                    └─────────────────────────────────────────────────────────────┘

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Key Changes

1. Model Context Protocol (MCP) Integration

• src/modules/mcp/: Added McpClientManager leveraging @modelcontextprotocol/sdk to connect to SSE-based MCP servers.
• src/modules/mcp/mcp.tools.ts: Provided property sanitization and transformation from standard MCP tool definitions to Big-AGI AixTools_ToolDefinition.
• src/modules/mcp/mcp.router.ts & src/server/trpc/: Added tRPC procedures (mcp.listTools, mcp.callTool) to enable tool execution from anywhere across the app.
• src/modules/aix/client/ & src/apps/chat/editors/chat-persona.ts: Integrated tools into chat generation payloads across both direct client fetch and tRPC pipelines, with an automated tool execution loop.

2. Apple Design & Emil Kowalski UI Craft

• Tactile Feedback: Implemented sub-120ms :active { transform: scale(0.97) } press states across buttons, chips, and controls.
• Liquid Glass Materials: Enhanced modals and navigation bars with backdrop-filter: blur(20px) saturate(180%) and soft layered depth.
• Critically Damped Motion: Replaced overshooting keyframes with smooth scale(0.95) -> 1.0 transitions using cubic-bezier(0.16, 1, 0.3, 1).
• Segmented Control: Refined the Models Setup Wizard with capsule-style category selectors and a live MCP bridge connection status badge.

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Verification & Type Safety

• Full codebase type check passed cleanly: npm run tscheck (tsc --noEmit --pretty) completed with 0 errors.
• Verified MCP tool listing and parameter sanitization against strict OpenAPI Zod wiretypes.
• Verified interactive press micro-animations and theme responsiveness in light and dark color schemes.

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Project	Deployment	Actions	Updated (UTC)
open	Ready	Preview	Aug 17, 2026 7:19pm