Nexus MCP Server

# Product Roadmap ## Phase 1: Core Features 1. [x] Deep Research Modes - Add `model` parameter to search tool supporting all four Perplexity Sonar tiers (sonar, sonar-pro, sonar-reasoning-pro, sonar-deep-research) with model-specific timeouts, cost notes in metadata, and backwards-compatible defaults. See `tasks/prd-deep-research-modes.md`. `L` 2. [x] Grok 4 Integration - Add xAI's Grok 4 model as alternative option with searchType metadata distinguishing realtime web search (Perplexity) from training-data knowledge (Grok 4). See `agent-os/specs/2026-01-11-grok-4-integration/`. `M`