Gemini is Google's open-source terminal agent for Gemini models; HagiCode is a workbench that can run it as an executor. Google moved individual and free users to Antigravity on June 18, 2026, so check which route you can still sign in with.
Gemini is Google's open-source (Apache 2.0) terminal agent for Gemini models. HagiCode is a desktop and web workbench that runs gemini as one of its Agent CLIs, adding parallel sessions, proposals and commits around it. It does not replace Gemini and it does not provide Gemini access.
One thing to check first: Google says Gemini was replaced by Antigravity for free Code Assist for individuals and for Google AI Pro and Ultra users on June 18, 2026. Gemini remains available through paid Gemini or Gemini Enterprise Agent Platform API keys and Gemini Code Assist Standard or Enterprise licences. HagiCode needs a gemini install you can still authenticate; its list of Agent CLIs does not include Antigravity.
If you only want a terminal agent and your Gemini route still works, stay with Gemini alone.
| Dimension | Gemini | HagiCode |
|---|---|---|
| What it is | Open-source terminal AI agent from Google for Gemini models | Desktop and web AI programming workbench that drives Agent CLIs you install |
| Interface and platforms | Terminal UI; install via npm, Homebrew or MacPorts; headless mode with JSON output | Desktop app for Windows, macOS, Linux; Docker Compose container; Microsoft Store edition |
| Pricing and licensing | Apache 2.0 licence; model use needs a paid Gemini API key, Vertex/Enterprise Agent Platform, or a Code Assist Standard/Enterprise licence | Desktop and Container free; Store edition free with optional one-time TurboEngine purchase |
| Model and provider access | Gemini models only; Google says it is not optimised for its newest model and points to Antigravity for it | Hosts no models; uses whatever gemini is signed in with, so cost stays with Google |
| Parallel work | One session per terminal; subagents inside a session | Several concurrent sessions across repos, managed from an Agents view |
| Spec and planning workflow | Plan mode, todo-based task planning, checkpointing and rewind | OpenSpec proposals: propose, validate, apply, archive; 3 concurrent on free editions, 32 with TurboEngine |
| Git and commit handling | Runs shell and Git commands inside the session; no dedicated commit workflow | AI-composed commits, Git management, GitHub integration, embedded Code Server editor |
| Setup effort | npm install -g @google/gemini-cli plus Google or API-key sign-in | Install HagiCode Desktop, with a working, signed-in gemini already on the machine |
| Best for | Open-source-minded developers on a paid Gemini or Code Assist route who want a terminal agent | Developers running several tasks or repos who want a GUI and a spec discipline |
The code is Apache 2.0 and public, which matters if you want to read how an agent handles your files or fork it. Headless mode prints text, JSON or streaming JSON, so it slots into scripts and pipelines in a way a GUI cannot.
GEMINI.md context files carry project rules into every session, .geminiignore keeps files out, and checkpointing with rewind lets you save and resume conversations. These are plain files you can commit, which suits teams that want agent behaviour reviewed like code.
Beyond editing and shell commands it offers Agent Skills, subagents, plan mode, hooks, extensions, web search and fetch, MCP servers and IDE integration. Release channels (preview, stable and nightly, published weekly or daily) let you choose how fast to move.
You can sign in with a Google account, use a GEMINI_API_KEY for usage-based billing, or use Vertex AI for enterprise setups. Sandboxing and trusted folders limit what the agent can touch. The caveat is that availability now depends on which route you use, as explained above.
GEMINI.md, hooks and extensions and want them to run in the same terminal you already use.HagiCode starts the gemini executable you already installed, in its ACP mode (--acp), and shows the session in its own interface. Your install, authentication and Google billing stay exactly as they were.
Nothing is locked in: your repositories stay ordinary Git repositories and you can run gemini in a terminal at any time.
npm install -g @google/gemini-cli or brew install gemini-cli) and sign in with a route that is still supported, such as an API key.gemini.Gemini runs one conversation per terminal. HagiCode can keep several Gemini sessions going across repositories and show them in one Agents view.
Your GEMINI.md carries rules, but not the reasoning behind a change. An OpenSpec proposal records it, is validated before the agent applies it, and is archived afterwards.
HagiCode can compose a commit message from what Gemini changed, and the embedded Code Server lets you review the edits without opening another editor.
Monospecs lets a Gemini session work across several repositories; Vault stores cross-project notes that outlast any session or context window.
Gemini's tool calls appear in the same layout as every other agent, and an optional TokenMonitor can show usage in the status bar. Model access and billing remain Google's.
gemini underneath; it adds sessions, proposals and commits, not models.npm install -g @google/gemini-cli, brew install gemini-cli, or try it with npx @google/gemini-cli. Then start gemini and choose an authentication method.gemini install that can still authenticate. Pick Gemini as the Agent CLI in HagiCode; HagiCode does not include Antigravity.HagiCode is an agentic coding workspace. Rich, convenient UI interactions make planning, agent execution, and project work approachable and easy to navigate, creating an engaging development experience.
Explore an engaging development experience through rich, convenient UI interactions.
HagiCode is an agentic coding workspace. OpenSpec workflows plan the change, multi-agent execution carries it out, and Hero Scenario makes the long run visible, so ideas become shipped software.
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