Add, configure, and build Model Context Protocol (MCP) servers for Claude Code — HTTP, SSE, and stdio transports, management commands, permission rules, and a curated list of useful servers.
Author and load custom Claude Code skills — how skills are discovered, the SKILL.md schema, available-skills list, packaging, project-vs-user scope, plugin namespacing, and the difference from slash commands.
Add and configure Model Context Protocol (MCP) servers in Codex CLI — config.toml [mcp_servers.*] reference, the codex mcp subcommand, per-server tool approval modes, and the /mcp runtime command.
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