TermdockCheck Your Access First
Claude Code and Gemini CLI can split exploration, implementation, and review. That does not mean two tools automatically cost less. Cost depends on authentication, model, request volume, and the plans you actually need; adding a second tool can increase the bill.
Checked in October 2026: Google's May transition announcement says Gemini CLI stopped serving Gemini Code Assist individual free users and Google AI Pro/Ultra users on June 18, directing them to Antigravity CLI. It says Code Assist Standard/Enterprise and paid Gemini and Gemini Enterprise Agent Platform API keys remain supported. However, the Gemini CLI authentication and quota docs still list personal-account access and free quotas. The official sources conflict. Check the latest announcement and verify access with your own account before starting; do not assume the old 1,000-requests-per-day individual allowance still works. We have not tested eligibility across account types.
Claude Code has subscription and API access paths; check eligibility and costs in Anthropic's setup documentation. If Gemini CLI is unavailable to you, use another CLI you can access for the same handoff. Antigravity CLI is not interchangeable with Gemini CLI in every detail.
The Decision Framework
| Stage | Example assignment | Handoff |
|---|---|---|
| Explore | Ask Gemini CLI to inspect the relevant code without editing | Paths, current behavior, open questions |
| Implement | Give Claude Code the requirement and exploration results | Scope, diff, test results |
| Review | Ask another session to check the diff against the requirement | Specific findings, evidence locations, unknowns |
This is a division of work, not a model ranking. Evaluate it on your own tasks. Authentication, payments, and security changes still need human review and appropriate tests. A prompt saying "read-only" is not isolation; use the tool's permissions to restrict its actions.
Setting Up Both Side by Side
Install and authenticate each CLI according to its official docs and confirm the billing path. The Gemini CLI installation guide lists Node.js requirements and npm installation; follow Anthropic's setup guide for Claude Code. Do not paste API keys into prompts, shared files, or terminal output.
Open the project as a Termdock workspace, split two terminals, and start your installed, authenticated CLIs. Check each working directory and Git state, then pass the task and findings to the other session. Separate conversations do not automatically share context. If both agents need to edit concurrently, assign file ownership or create separate Git worktrees yourself.
Let One Agent Hand Off to Another
For agent-controlled terminals on macOS, install the termdock CLI from Settings > Skills > Command Line Tool and use the bundled terminal skill. For example, ask Claude Code: "Use Termdock to open a Gemini CLI terminal, ask it to review this diff against the requirements without editing, and report file locations and concerns. Read the response and summarize it for me; do not merge." First confirm the other CLI is installed and has access. You can also copy the task and results manually. Windows supports the desktop and HTTP Terminal API; one-click CLI installation is currently macOS-only.
See the Claude Code and Codex Termdock workflow for setup and permission boundaries; substitute a CLI you can access and configure its own permissions.
A Workflow Example
Suppose an existing API needs rate limiting:
- Explore: Ask the first session to identify the API entry points, existing middleware, and related tests. Request file paths and unknowns; do not edit.
- Decide: Check the constraints, dependencies, and deployment environment yourself instead of treating the exploration as an approved design.
- Implement: Give Claude Code the decision, relevant paths, allowed files, and test commands. Ask for the diff and test output.
- Review: Give the requirements and diff location to another read-only session and ask for missed edge cases. Verify each finding and rerun the relevant tests.
This is an illustrative workflow, not a measured time or cost claim, and no model is guaranteed to succeed.
The Cost Math
Track subscription fees, API usage, models, and requests over a representative period, then compare the total with your old workflow. A fixed subscription does not automatically become cheaper because you use it less; extra API calls can add cost. Savings exist only if a lower plan is sufficient and the combined bill is lower. There is no verifiable 60–70% savings measurement behind the earlier version of this article.
When This Strategy Does Not Work
For a small task, handoff overhead may outweigh another opinion. If data cannot be sent to a second provider, use one tool instead. Check provider data policies and organizational permission before sharing sensitive information. During an incident, prioritize observability and human judgment over adding coordination delay.
Getting Started Checklist
- Verify authentication, permissions, and budget for both tools; test personal-account eligibility with Google.
- Pick a low-risk task and write down the requirement, edit scope, and checks.
- Require traceable paths and results from exploration, implementation, and review; inspect them yourself.
- Track combined usage and outcomes before deciding whether to keep the second tool.
For a more detailed handoff, see the dual-tool workflow.