Prune per-harness tool-mapping boilerplate

The verbose action-to-tool tables and skill-loading explainers in the
per-harness reference files restated guidance modern agents already
follow. Trim each file to the harness-specific notes that still carry
weight (subagent dispatch, task tracking, instructions-file paths), and
delete claude-code-tools.md and copilot-tools.md, which had nothing left
that wasn't generic.

.codex-plugin/plugin.json

@@ -21,6 +21,7 @@
     "workflow"
   ],
   "skills": "./skills/",
+  "hooks": "./hooks/hooks-codex.json",
   "interface": {
     "displayName": "Superpowers",
     "shortDescription": "Planning, TDD, debugging, and delivery workflows for coding agents",

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. 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/`.
+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/`.
 
 ## 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), [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), [Gemini CLI](#gemini-cli), [GitHub Copilot CLI](#github-copilot-cli), [Kimi Code](#kimi-code), [OpenCode](#opencode), [Pi](#pi).
 
 ## How it works
 
@@ -122,6 +122,20 @@ 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:

hooks/hooks-codex.json

@@ -0,0 +1,16 @@
+{
+  "hooks": {
+    "SessionStart": [
+      {
+        "matcher": "startup|clear|compact",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "\"${PLUGIN_ROOT}/hooks/run-hook.cmd\" session-start-codex",
+            "async": false
+          }
+        ]
+      }
+    ]
+  }
+}

skills/brainstorming/visual-companion.md

@@ -74,6 +74,13 @@ 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, 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.
+**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.
 
 ## The Process
 

skills/using-superpowers/SKILL.md

@@ -4,7 +4,7 @@ description: Use when starting any conversation - establishes how to find and us
 ---
 
 <SUBAGENT-STOP>
-If you were dispatched as a subagent to execute a specific task, ignore this skill.
+If you were dispatched as a subagent to execute a specific task, skip this skill.
 </SUBAGENT-STOP>
 
 <EXTREMELY-IMPORTANT>
@@ -12,23 +12,72 @@ If you think there is even a 1% chance a skill might apply to what you are doing
 
 IF A SKILL APPLIES TO YOUR TASK, YOU DO NOT HAVE A CHOICE. YOU MUST USE IT.
 
-This is not negotiable. You cannot rationalize your way out of this.
+This is not negotiable. This is not optional. You cannot rationalize your way out of this.
 </EXTREMELY-IMPORTANT>
 
+## Instruction Priority
+
+Superpowers skills override default system prompt behavior, but **user instructions always take precedence**:
+
+1. **User's explicit instructions** (CLAUDE.md, GEMINI.md, AGENTS.md, direct requests) — highest priority
+2. **Superpowers skills** — override default system behavior where they conflict
+3. **Default system prompt** — lowest priority
+
+If CLAUDE.md, GEMINI.md, or AGENTS.md says "don't use TDD" and a skill says "always use TDD," follow the user's instructions. The user is in control.
+
+## How to Access Skills
+
+**Never read skill files manually with file tools** — always use your platform's skill-loading mechanism so the skill is properly activated.
+
+**In Claude Code:** Use the `Skill` tool. When you invoke a skill, its content is loaded and presented to you — follow it directly.
+
+**In Codex:** Skills load natively. Follow the instructions presented when a skill activates.
+
+**In Copilot CLI:** Use the `skill` tool. Skills are auto-discovered from installed plugins.
+
+**In Gemini CLI:** Skills activate via the `activate_skill` tool. Gemini loads skill metadata at session start and activates the full content on demand.
+
+**In other environments:** Check your platform's documentation for how skills are loaded.
+
+## Platform Adaptation
+
+Skills speak in actions ("dispatch a subagent", "create a todo", "read a file") rather than naming any one runtime's tools. For per-platform tool equivalents and instructions-file conventions, see [claude-code-tools.md](references/claude-code-tools.md), [codex-tools.md](references/codex-tools.md), [copilot-tools.md](references/copilot-tools.md), [gemini-tools.md](references/gemini-tools.md), [pi-tools.md](references/pi-tools.md), and [antigravity-tools.md](references/antigravity-tools.md). Gemini CLI users get the tool mapping loaded automatically via GEMINI.md.
+
+# Using Skills
+
 ## The Rule
 
-**Invoke relevant or requested skills BEFORE any response or action** — including clarifying questions, exploring the codebase, or checking files. If it turns out wrong for the situation, you don't have to use it.
+**Invoke relevant or requested skills BEFORE any response or action.** Even a 1% chance a skill might apply means that you should invoke the skill to check. If an invoked skill turns out to be wrong for the situation, you don't need to use it.
 
-**Before entering plan mode:** if you haven't already brainstormed, invoke the brainstorming skill first.
+```dot
+digraph skill_flow {
+    "User message received" [shape=doublecircle];
+    "About to enter plan mode?" [shape=doublecircle];
+    "Already brainstormed?" [shape=diamond];
+    "Invoke brainstorming skill" [shape=box];
+    "Might any skill apply?" [shape=diamond];
+    "Invoke the skill" [shape=box];
+    "Announce: 'Using [skill] to [purpose]'" [shape=box];
+    "Has checklist?" [shape=diamond];
+    "Create a todo per item" [shape=box];
+    "Follow skill exactly" [shape=box];
+    "Respond (including clarifications)" [shape=doublecircle];
 
-Then announce "Using [skill] to [purpose]" and follow the skill exactly. If it has a checklist, create a todo per item.
+    "About to enter plan mode?" -> "Already brainstormed?";
+    "Already brainstormed?" -> "Invoke brainstorming skill" [label="no"];
+    "Already brainstormed?" -> "Might any skill apply?" [label="yes"];
+    "Invoke brainstorming skill" -> "Might any skill apply?";
 
-## Skill Priority
-
-When multiple skills apply, process skills come first — they set the approach, then implementation skills (frontend-design, etc.) carry it out. Brainstorming and systematic-debugging are Superpowers' most common process skills, but the rule holds for any of them.
-
-- "Let's build X" → superpowers:brainstorming first, then implementation skills.
-- "Fix this bug" → superpowers:systematic-debugging first, then domain skills.
+    "User message received" -> "Might any skill apply?";
+    "Might any skill apply?" -> "Invoke the skill" [label="yes, even 1%"];
+    "Might any skill apply?" -> "Respond (including clarifications)" [label="definitely not"];
+    "Invoke the skill" -> "Announce: 'Using [skill] to [purpose]'";
+    "Announce: 'Using [skill] to [purpose]'" -> "Has checklist?";
+    "Has checklist?" -> "Create a todo per item" [label="yes"];
+    "Has checklist?" -> "Follow skill exactly" [label="no"];
+    "Create a todo per item" -> "Follow skill exactly";
+}
+```
 
 ## Red Flags
 
@@ -49,14 +98,24 @@ These thoughts mean STOP—you're rationalizing:
 | "This feels productive" | Undisciplined action wastes time. Skills prevent this. |
 | "I know what that means" | Knowing the concept ≠ using the skill. Invoke it. |
 
-## Platform Adaptation
+## Skill Priority
 
-If your harness appears here, read its reference file for special instructions:
+When multiple skills could apply, use this order:
 
-- Codex: `references/codex-tools.md`
-- Pi: `references/pi-tools.md`
-- Antigravity: `references/antigravity-tools.md`
+1. **Process skills first** (brainstorming, systematic-debugging) - these determine HOW to approach the task
+2. **Implementation skills second** (frontend-design, mcp-builder) - these guide execution
+
+"Let's build X" → brainstorming first, then implementation skills.
+"Fix this bug" → systematic-debugging first, then domain-specific skills.
+
+## Skill Types
+
+**Rigid** (TDD, systematic-debugging): Follow exactly. Don't adapt away discipline.
+
+**Flexible** (patterns): Adapt principles to context.
+
+The skill itself tells you which.
 
 ## User Instructions
 
-User instructions (CLAUDE.md, AGENTS.md, GEMINI.md, etc, direct requests) take precedence over skills, which in turn override default behavior. Only skip skill workflows or instructions when your human partner has explicitly told you to.
+Instructions say WHAT, not HOW. "Add X" or "Fix Y" doesn't mean skip workflows.

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

@@ -0,0 +1,63 @@
+# 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** 
+**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.
 
 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).