Remove Gemini CLI support

Google EOLed the Gemini CLI on 2026-06-18; the extension can no longer
be installed or updated. Remove Gemini from the install docs, the
subagent-capable platform lists, and the eval-harness description, and
delete its tool-mapping reference.

CLAUDE.md

@@ -101,7 +101,7 @@ Skills are not prose — they are code that shapes agent behavior. If you modify
 
 ## Eval harness
 
-Skill-behavior evals live in [superpowers-evals](https://github.com/prime-radiant-inc/superpowers-evals/), cloned into `evals/` — see `evals/README.md` for setup. Drill (the harness) drives real tmux sessions of Claude Code / Codex / Gemini CLI and judges skill compliance with an LLM verifier. Plugin-infrastructure tests still live at `tests/`.
+Skill-behavior evals live in [superpowers-evals](https://github.com/prime-radiant-inc/superpowers-evals/), cloned into `evals/` — see `evals/README.md` for setup. The harness drives real tmux sessions of Claude Code / Codex and judges skill compliance with an LLM verifier. Plugin-infrastructure tests still live at `tests/`.
 
 ## Understand the Project Before Contributing
 

README.md

@@ -11,7 +11,7 @@ If this sounds like someone you know, definitely send them our way.
 
 ## Quickstart
 
-Give your agent Superpowers: [Claude Code](#claude-code), [Antigravity](#antigravity), [Codex App](#codex-app), [Codex CLI](#codex-cli), [Cursor](#cursor), [Factory Droid](#factory-droid), [Gemini CLI](#gemini-cli), [GitHub Copilot CLI](#github-copilot-cli), [Kimi Code](#kimi-code), [OpenCode](#opencode), [Pi](#pi).
+Give your agent Superpowers: [Claude Code](#claude-code), [Antigravity](#antigravity), [Codex App](#codex-app), [Codex CLI](#codex-cli), [Cursor](#cursor), [Factory Droid](#factory-droid), [GitHub Copilot CLI](#github-copilot-cli), [Kimi Code](#kimi-code), [OpenCode](#opencode), [Pi](#pi).
 
 ## How it works
 
@@ -122,20 +122,6 @@ Superpowers is available via the [official Codex plugin marketplace](https://git
   droid plugin install superpowers@superpowers
   ```
 
-### Gemini CLI
-
-- Install the extension:
-
-  ```bash
-  gemini extensions install https://github.com/obra/superpowers
-  ```
-
-- Update later:
-
-  ```bash
-  gemini extensions update superpowers
-  ```
-
 ### GitHub Copilot CLI
 
 - Register the marketplace:

skills/brainstorming/visual-companion.md

@@ -74,13 +74,6 @@ On Windows, the script auto-detects and switches to foreground mode (which block
 scripts/start-server.sh --project-dir /path/to/project --open
 ```
 
-**Gemini CLI:**
-```bash
-# Use --foreground and set is_background: true on your shell tool call
-# so the process survives across turns
-scripts/start-server.sh --project-dir /path/to/project --open --foreground
-```
-
 **Copilot CLI:**
 ```bash
 # Use --foreground and start the server via the bash tool with mode: "async"

skills/executing-plans/SKILL.md

@@ -11,7 +11,7 @@ Load plan, review critically, execute all tasks, report when complete.
 
 **Announce at start:** "I'm using the executing-plans skill to implement this plan."
 
-**Note:** Tell your human partner that Superpowers works much better with access to subagents. The quality of its work will be significantly higher if run on a platform with subagent support (Claude Code, Codex CLI, Codex App, Copilot CLI, and Gemini CLI all qualify; see the per-platform tool refs in `../using-superpowers/references/`). If subagents are available, use superpowers:subagent-driven-development instead of this skill.
+**Note:** Tell your human partner that Superpowers works much better with access to subagents. The quality of its work will be significantly higher if run on a platform with subagent support (Claude Code, Codex CLI, Codex App, and Copilot CLI all qualify; see the per-platform tool refs in `../using-superpowers/references/`). If subagents are available, use superpowers:subagent-driven-development instead of this skill.
 
 ## The Process
 

skills/using-superpowers/references/gemini-tools.md

@@ -1,63 +0,0 @@
-# Gemini CLI Tool Mapping
-
-Skills speak in actions ("dispatch a subagent", "create a todo", "read a file"). On Gemini CLI these resolve to the tools below.
-
-| Action skills request | Gemini CLI equivalent |
-|----------------------|----------------------|
-| Read a file | `read_file` |
-| Read multiple files at once | `read_many_files` |
-| Create a new file | `write_file` |
-| Edit a file | `replace` |
-| Run a shell command | `run_shell_command` |
-| Search file contents | `grep_search` |
-| Find files by name | `glob` |
-| List files and subdirectories | `list_directory` |
-| Fetch a URL | `web_fetch` |
-| Search the web | `google_web_search` |
-| Invoke a skill | `activate_skill` |
-| Dispatch a subagent (`Subagent (general-purpose):` template) | `invoke_agent` with `agent_name: "generalist"` (invocable via `@generalist` chat syntax — see [Subagent support](#subagent-support)) |
-| Multiple parallel dispatches | Multiple `invoke_agent` calls in the same response |
-| Task tracking ("create a todo", "mark complete") | `write_todos` (statuses: pending, in_progress, completed, cancelled, blocked) |
-
-## Instructions file
-
-When a skill mentions "your instructions file", on Gemini CLI this is **`GEMINI.md`**. Gemini CLI loads `GEMINI.md` hierarchically: global at `~/.gemini/GEMINI.md`, project-level files in workspace directories and their ancestors, and sub-directory `GEMINI.md` files when a tool accesses files in those directories.
-
-## Personal skills directory
-
-User-level skills live at **`~/.gemini/skills/`**, with **`~/.agents/skills/`** as a cross-runtime alias (shared with Codex and Copilot CLI). When both directories exist at the same scope, `.agents/skills/` takes precedence. Each skill is a subdirectory containing a `SKILL.md` (with `name` and `description` frontmatter).
-
-## Subagent support
-
-Gemini CLI dispatches subagents through the `invoke_agent` tool, which takes `agent_name` and `prompt` parameters. The same dispatch is also surfaced as a chat-syntax shortcut: typing `@generalist <prompt>` is equivalent to calling `invoke_agent` with `agent_name: "generalist"`. Built-in agent names include `generalist`, `cli_help`, `codebase_investigator`, and (with browser tooling enabled) `browser_agent`.
-
-Skills dispatch with `Subagent (general-purpose):` and either reference a prompt-template file (e.g., `superpowers:subagent-driven-development`'s `./implementer-prompt.md`) or supply an inline prompt. On Gemini CLI:
-
-| Skill dispatch form | Gemini CLI equivalent |
-|---------------------|----------------------|
-| References a `*-prompt.md` template (implementer, task-reviewer, code-reviewer, etc.) | Fill the template, then `invoke_agent` with `agent_name: "generalist"` and the filled prompt |
-| References `superpowers:requesting-code-review`'s `./code-reviewer.md` | `invoke_agent` with `agent_name: "generalist"` and the filled review template |
-| Inline prompt (no template referenced) | `invoke_agent` with `agent_name: "generalist"` and your inline prompt |
-
-### Prompt filling
-
-Skills provide prompt templates with placeholders like `{WHAT_WAS_IMPLEMENTED}` or `[FULL TEXT of task]`. Fill all placeholders before passing the complete prompt to `invoke_agent`. The prompt template itself contains the agent's role, review criteria, and expected output format — the subagent will follow it.
-
-### Parallel dispatch
-
-Gemini CLI supports parallel subagent dispatch. Issue multiple `invoke_agent` calls in the same response (or multiple `@generalist` invocations in one prompt) to run independent subagent work in parallel. Keep dependent tasks sequential, but do not serialize independent subagent tasks just to preserve a simpler history.
-
-## Additional Gemini CLI tools
-
-These tools are unique to Gemini CLI:
-
-| Tool | Purpose |
-|------|---------|
-| `save_memory` (legacy) | Persist facts across sessions when `experimental.memoryV2 = false` |
-| `get_internal_docs` | Look up Gemini CLI's bundled documentation |
-| `ask_user` | Pose structured questions to the user (text / single-select / multi-select) |
-| `enter_plan_mode` / `exit_plan_mode` | Switch into and out of read-only plan mode |
-| `update_topic` | Update the current conversation's topic / strategic-intent metadata |
-| `complete_task` | Signal that a Gemini subagent has completed and return its result to the parent agent |
-| `tracker_create_task`, `tracker_update_task`, `tracker_get_task`, `tracker_list_tasks`, `tracker_add_dependency`, `tracker_visualize` | Rich task tracker with dependency and visualization support |
-| `read_mcp_resource`, `list_mcp_resources` | MCP resource access |

skills/writing-skills/SKILL.md

@@ -9,7 +9,7 @@ description: Use when creating new skills, editing existing skills, or verifying
 
 **Writing skills IS Test-Driven Development applied to process documentation.**
 
-**Personal skills live in your runtime's skills directory** — see [claude-code-tools.md](../using-superpowers/references/claude-code-tools.md), [codex-tools.md](../using-superpowers/references/codex-tools.md), [copilot-tools.md](../using-superpowers/references/copilot-tools.md), or [gemini-tools.md](../using-superpowers/references/gemini-tools.md) for the path on your runtime. Codex, Copilot CLI, and Gemini CLI all also recognize `~/.agents/skills/` as a cross-runtime alias.
+**Personal skills live in your runtime's skills directory** 
 
 You write test cases (pressure scenarios with subagents), watch them fail (baseline behavior), write the skill (documentation), watch tests pass (agents comply), and refactor (close loopholes).