HagiCode is a proposal-driven AI coding workbench that turns a request into a reviewable proposal, runs it through agent CLIs such as Claude Code, Codex and GitHub Copilot, and keeps the outcome as team knowledge.
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.
Open-source terminal AI agent from Google for Gemini models
Desktop and web AI programming workbench that drives Agent CLIs you install
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
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
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
One session per terminal; subagents inside a session
Several concurrent sessions across repos, managed from an Agents view
Plan mode, todo-based task planning, checkpointing and rewind
OpenSpec proposals: propose, validate, apply, archive; 3 concurrent on free editions, 32 with TurboEngine
Runs shell and Git commands inside the session; no dedicated commit workflow
AI-composed commits, Git management, GitHub integration, embedded Code Server editor
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
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.The tool is open source under Apache 2.0, but model use is not free for everyone. 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, while paid API keys and Code Assist Standard or Enterprise licences continue.
Not entirely. Google moved individual users (free Code Assist, Google AI Pro and Ultra) to Antigravity, but says Gemini remains available through paid Gemini and Gemini Enterprise Agent Platform API keys, and unchanged for enterprise licences.
Run `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.
Yes, if you have a `gemini` install that can still authenticate. Pick Gemini as the Agent CLI in HagiCode; HagiCode does not include Antigravity.
Use Gemini alone for a simple terminal agent. Add HagiCode for parallel sessions, OpenSpec proposals and a GUI over the same CLI.
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