Gemini API shuts down the May Antigravity agent on 5 October, with renamed tools

Gemini API shuts down the May Antigravity agent on 5 October, with renamed tools

22 September 2026 — Google released a new build of its Antigravity managed agent on the Gemini API on 17 September 2026, called antigravity-preview-09-2026, and set 5 October 2026 as the shutdown date for the version it replaces, antigravity-preview-05-2026. The change is recorded in the Gemini API release notes and on the deprecations page. That leaves less than three weeks between the notice and the shutdown.

Not yet independently verified. Rests on Google's own changelog and deprecations page; the only other coverage found was blog posts repeating them, so nothing here has been independently confirmed. We will update this when it can be confirmed, and remove this note.

What changes

Google describes the Antigravity agent as a general-purpose managed agent that reasons, runs code, manages files and browses the web inside a Google-hosted Linux sandbox. It is available through the Interactions API and Google AI Studio. The May version was released on 19 May 2026; both versions are previews.

Google says the effort needed depends on how you use it:

• If you run the agent in Google's remote sandbox and read only its text output, you change the agent string and nothing else.
• If you run its tools on your own machines, or parse the function-call steps it returns, the built-in tools have changed. Parameter names move from snake_case to PascalCase, and file edits become line-range replacements rather than whole-file rewrites.

The changelog's comparison table shows:

• File creation: write_file becomes write_to_file, with new parameters including TargetFile and CodeContent.
• File editing: whole-file rewrites through write_file become replace_file_content, with StartLine and EndLine.
• File reading: read_file with byte offsets becomes view_file with line ranges.
• Directory listing: list_files becomes list_dir.
• Search: new find_by_name and grep_search tools, where agents previously used shell commands.
• Shell execution and web search are unchanged.

Google's deprecations page says that once a model or agent is shut down it is turned off completely and the endpoint is no longer available.

What to do

• Search your code, scheduled jobs and CI configuration for antigravity-preview-05-2026.
• If you use only the remote sandbox and read output text, update the agent string and run your tests.
• If you execute the tools yourself, update your handlers for the new names and parameters, including line-based editing, and add handlers for the two search tools.
• If you log, audit or filter tool calls, update any parsers, alert rules and dashboards that match the old tool names.
• Finish testing before 5 October.
• Plan for more change: the replacement is also a preview, and Google has not announced a shutdown date for it.
• If a supplier builds on this agent for you, ask them to confirm in writing that they have migrated.

What the notice leaves out

Google's pages do not explain why the tools were redesigned or say whether any compatibility option exists for the old tool names. The Antigravity agent guide read today shows only the new version and does not mention the May release. The deprecations page describes listed shutdown dates in general as the earliest dates on which a model might be retired, but the changelog states 5 October plainly for this agent.

Sources

• Google AI for Developers: Gemini API release notes, entry for 17 September 2026 — 17 September 2026
• Google AI for Developers: Gemini deprecations, managed agents table — 17 September 2026
• Google AI for Developers: Antigravity agent guide — 17 September 2026