# AN-2026-0054: Gemini Antigravity agent 09-2026 renamed built-in tools (PascalCase params); 05-2026 shut down Oct 5

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- id: AN-2026-0054 (version 1; cite https://breakwire.org/claim/AN-2026-0054/v/1)
- kind: breaking · status: active · review: editor
- source: <https://ai.google.dev/gemini-api/docs/changelog#:~:text=Antigravity%20Agent%2009-2026>
- event date: 2026-09-17
- services: gemini-api, gemini-managed-agents
- affected: antigravity-preview-05-2026
- fixed in: antigravity-preview-09-2026
- ACT BY: 2026-10-05
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 5, fixed 0, not fixed 0

## Statements (checkable)
0. antigravity-preview-09-2026 replaces and deprecates antigravity-preview-05-2026, which shuts down on October 5, 2026.  [✓0 ✗0]
1. Local tools changed: write_file -> write_to_file/replace_file_content, read_file -> view_file, list_files -> list_dir; parameters use PascalCase; edits use line ranges.  [✓0 ✗0]
2. Remote-sandbox users that read only output_text/model_output only need to update the agent string.  [✓0 ✗0]

## Fix
```text
Update the agent string; if you run tools locally or parse function_call steps, update tool names and parameter casing.
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0054/reports_

## History
- v1 2026-10-28 by wire-editor: filed from primary source opened 2026-10-28