Claude

I get better output from Claude Code by adding fewer tools, not more. Piling on MCP servers rarely helps, but the right official marketplace plugins, CLI tools, and skills do. Start with /plugin and picks like typescript-lsp and security-guidance, then add Supabase CLI, Playwright, GitHub CLI, and the GSD framework. That stack handles code, deploys, research, and browser work on its own.

When I first found Claude Code, I tried to connect every MCP server I could find. Within a week, the agent felt slower and less decisive, and it often picked the wrong tool for the job. The fix was almost always a smaller, more careful toolset.

Claude Code Agent Teams is an experimental feature, live since v2.1.32. It lets you run 2-16 Claude Code sessions under one team lead. Each teammate gets its own context window and full tool access. They talk through a shared task list and direct peer-to-peer messages. You turn it on with one config change, then describe the team you want in plain language. Claude handles the spawning, the assignment, and the coordination. The feature shines on work you can split up: multi-file refactors, cross-layer feature builds, and research-and-review jobs. The catch is that it costs 3-7x more tokens than a single session, and it cannot resume a session.

The single most important file in any Claude Code project is CLAUDE.md - a persistent instruction set that loads every session and shapes how the agent reads, writes, and verifies code. But CLAUDE.md alone is not what separates productive setups from fragile ones. The real productivity stack in 2026 combines CLAUDE.md conventions with on-demand skills, deterministic hooks, and git worktree isolation for running 10-15 parallel sessions against a single repository. Each session is scoped to one task, operating in its own branch, turning a solo developer into a small engineering team .

Claude Code doesn’t use MCP as a plugin system. It is MCP. On March 31, 2026, Anthropic shipped a 59.8 MB source map by accident in npm package @anthropic-ai/claude-code v2.1.88. Developers got a rare look at how a real AI coding agent works. Every capability in Claude Code (file reads, bash, web fetches, Computer Use, IDE bridges) runs as a single permission-gated MCP tool call. There is no special internal API. Third-party MCP servers you connect get the same execution path, permission checks, and error handling as Anthropic’s own built-in tools.

One missing line in a build config caused the worst source leak in AI tooling history. On March 31, 2026, Anthropic shipped version 2.1.88 of its @anthropic-ai/claude-code package with a 59.8 MB JavaScript source map inside. That map held the full client agent harness for Claude Code : 512,000 lines of readable TypeScript in 1,906 files. Mirrors of the code spread thousands of times in hours. A clean-room Python/Rust rewrite then became the fastest-growing repo in GitHub history. Anthropic’s legal response hit the wrong targets. The day got worse: a supply-chain attack hit the axios npm package, piling on for devs who rely on these tools.

Claude Code combined with custom MCP (Model Context Protocol) servers creates a local AI coding agent that can read and write files, query databases, call APIs, and execute shell commands - all orchestrated by Claude through a standardized tool-use interface. You set up the Claude Code CLI, configure MCP servers in your project or user settings, and the agent automatically discovers and uses the tools you expose. The result is a development workflow where you describe tasks in natural language and Claude executes multi-step coding operations with full access to your project context.