AI Coding Agent Code Index MCP Comparison 2026: Sourcegraph, CodeGraph, Claude Context, and CocoIndex Code
By mid-2026, every serious AI coding agent can read your files, search your codebase, and navigate your project structure. The problem isn’t access — it’s that agents spend 40-60% of their tool calls just finding the right code before they can do anything useful with it. I’ve watched Claude Code burn through 15-20 grep and read calls just to understand a single function’s callers and callees. That’s where code index MCP servers come in: they pre-build a structured or semantic map of your codebase so the agent can ask “what calls this function?” in one call instead of ten. ...