Agents, AI, and models¶
Native integrations, plugins, protocols, and external CLIs have different costs and trust boundaries. "Supported" means current documentation describes a connection, not equal quality or safety.
IntelliJ IDEA Ultimate 2026.2¶
IDEA can bring Codex, Claude Agent, Junie, and ACP agents into AI Assistant, plus JetBrains Air in IDEs for multiple sessions and local/ACP agents. JetBrains documents running a custom ACP executable from WSL. GitHub Copilot is a separate Marketplace plugin. The built-in MCP server is off by default for ACP agents; tool access can be restricted. BYOK is available for selected agents/providers.
Ollama and LM Studio can power some AI Assistant features. Current limitation: agents cannot use local models, and local models cannot call configured MCP tools. "Local model" therefore does not mean "fully local agent."
Other environments¶
| Environment | Agents and protocols | Useful without AI |
|---|---|---|
| VS Code | Copilot integration; documented MCP; Codex/Claude Code through CLI or extensions | Yes, complete editor and extensions |
| RustRover / PyCharm | JetBrains AI/ACP/MCP; Copilot plugin | Yes, strong in their specialty |
| VSCodium | Open VSX extensions and CLI; Microsoft Copilot Marketplace integration is not default | Yes, with marketplace differences |
| Cursor | Native agent, tools and models by plan; ACP not established in reviewed sources | Yes, complete editor |
| Zed | ACP agents, MCP tools, local models | Yes, native editor |
| Neovim | CLI agents and plugins; user-configured | Yes, strong local control |
| Sublime Text 4 | LSP/DAP through packages; agent via CLI or third-party extension | Yes, strong editor without AI |
| Devin Desktop | Cognition agent and documented external integrations | Yes as editor, but agent-centric |
| Kiro | Agent and MCP documented; ACP/BYOK/local not established here | Yes, agent-led workflow |
| Antigravity | Agent orchestration and extensions; ACP/BYOK/local not confirmed | Yes, lower maturity |
See the full source-linked matrix. It separates documented support from unknowns.
Security and privacy¶
An agent may read repository files, change code, run commands, and contact a provider. Check provider, retention, quotas, permissions, MCP tools, and commercial plan. ACP/MCP standardize connections, not agent security. Extensions have their own licenses and supply chains.