Upgrade Gemini CLI nightly and gate subagents behind agents mode
Move to Gemini CLI v0.56.0-nightly.20260819.g571851b10 so subagents cannot run when agents mode is off, sub-agent handoff tokens work on startup, and editor/autocomplete terminal UX is fixed.Why this loop
Gemini CLI v0.56.0-nightly.20260819.g571851b10 (google-gemini/gemini-cli) ships five SSR Agent fixes. Issue 22093 blocks subagents when agents mode is disabled, so a disabled-agents config is actually enforced. Issue 28518 fixes the sub-agent handoff token regression on startup. Terminal UX: 23954 adds a trailing space to autocomplete suggestions; 24935 forces a terminal buffer rerender after exiting an external editor so the prompt is not left stale. Issue 28050 adds a Vertex AI locations documentation link. Pin this nightly to get the agents-mode gate, the handoff-token restore, and the editor/autocomplete redraws.
Proposed actions
- npm install -g @google/gemini-cli@0.56.0-nightly.20260819.g571851b10 && gemini --version — fail the change unless the printed version is exactly v0.56.0-nightly.20260819.g571851b10
- With Gemini CLI agents mode disabled, start a session and send a task that would normally spawn a subagent; confirm no subagent runs (issue 22093).
- Restart Gemini CLI and trigger a sub-agent handoff on the first prompt; confirm handoff tokens are present and startup no longer hits the issue 28518 regression.
- In Gemini CLI, trigger autocomplete on a partial command and confirm each suggestion has a trailing space (issue 23954); then open an external editor from the CLI, exit it, and confirm the terminal buffer rerenders with no leftover editor artifacts (issue 24935).
- If using Vertex AI with this CLI, open the Vertex location help/docs path and confirm the locations documentation link from issue 28050 is present.
Agent prompt
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Context
Assistant: Gemini CLI Proposal: Upgrade Gemini CLI nightly and gate subagents behind agents mode Summary: Move to Gemini CLI v0.56.0-nightly.20260819.g571851b10 so subagents cannot run when agents mode is off, sub-agent handoff tokens work on startup, and editor/autocomplete terminal UX is fixed. Primary source: https://github.com/google-gemini/gemini-cli/releases/tag/v0.56.0-nightly.20260819.g571851b10
Why it matters
Gemini CLI v0.56.0-nightly.20260819.g571851b10 (google-gemini/gemini-cli) ships five SSR Agent fixes. Issue 22093 blocks subagents when agents mode is disabled, so a disabled-agents config is actually enforced. Issue 28518 fixes the sub-agent handoff token regression on startup. Terminal UX: 23954 adds a trailing space to autocomplete suggestions; 24935 forces a terminal buffer rerender after exiting an external editor so the prompt is not left stale. Issue 28050 adds a Vertex AI locations documentation link. Pin this nightly to get the agents-mode gate, the handoff-token restore, and the editor/autocomplete redraws.
Suggested actions
- npm install -g @google/gemini-cli@0.56.0-nightly.20260819.g571851b10 && gemini --version — fail the change unless the printed version is exactly v0.56.0-nightly.20260819.g571851b10
- With Gemini CLI agents mode disabled, start a session and send a task that would normally spawn a subagent; confirm no subagent runs (issue 22093).
- Restart Gemini CLI and trigger a sub-agent handoff on the first prompt; confirm handoff tokens are present and startup no longer hits the issue 28518 regression.
- In Gemini CLI, trigger autocomplete on a partial command and confirm each suggestion has a trailing space (issue 23954); then open an external editor from the CLI, exit it, and confirm the terminal buffer rerenders with no leftover editor artifacts (issue 24935).
- If using Vertex AI with this CLI, open the Vertex location help/docs path and confirm the locations documentation link from issue 28050 is present.
Config surfaces this release may change
- subagent definitions — check your repo before applying
After you finish
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Tell the human: open https://devagentradar.com/proposals/gemini-cli-v0-56-0-nightly-20260819-g571851b10-upgrade-gemini-cli-nightl and mark Applied, Skipped, or Failed. Proposal id: 861a575c-d540-4205-9bba-a08972b98779
Please:
- Map the change to concrete pilot steps
- Flag security / permission implications
- Keep the pilot reversible
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