Antigravity Agent 09-2026

Google's Gemini API has a new build of its Gemini Antigravity agent, antigravity-preview-09-2026, which replaces and deprecates the May release. Developers running the agent on a remote sandbox and only reading its output text can just swap the model string, nothing else changes.

Anyone running tools locally, or parsing the agent's function-call steps directly, needs to update their code: the built-in tools now use PascalCase parameters instead of snake_case, and file edits are sent as line-range replacements rather than full file rewrites. Specific changes include:

• File creation moves from write_file(path, content) to write_to_file(TargetFile, CodeContent, Overwrite, Description)
• File editing moves from a full-rewrite write_file(path, content) to replace_file_content(TargetFile, StartLine, EndLine, TargetContent, ReplacementContent)
• File reading moves from byte-offset read_file(path, offset, limit) to view_file(AbsolutePath, StartLine, EndLine, ContentOffset)
• Directory listing moves from list_files(path) to list_dir(DirectoryPath)
• File and code search is now handled by new tools, find_by_name(SearchDirectory, Pattern, MaxDepth) and grep_search(SearchPath, Query, IsRegex), replacing shell commands the agent previously ran itself
• Shell execution and web search are unchanged, as code_execution(command, timeout_seconds) and google_search(queries)

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