diff --git a/.claude-plugin/marketplace.json b/.claude-plugin/marketplace.json
new file mode 100644
index 0000000..bb76967
--- /dev/null
+++ b/.claude-plugin/marketplace.json
@@ -0,0 +1,18 @@
+{
+  "name": "hydracept",
+  "description": "Official Hydracept plugin marketplace for Claude Code.",
+  "owner": {
+    "name": "Zencode Consulting Inc.",
+    "email": "support@hydracept.com",
+    "url": "https://hydracept.com"
+  },
+  "plugins": [
+    {
+      "name": "hydracept",
+      "source": "./",
+      "description": "Image, audio, video, 3D, and text generation for coding agents through one remote MCP server (https://api.hydracept.com/mcp).",
+      "category": "integrations",
+      "tags": ["mcp", "image-generation", "audio", "video", "3d", "game-assets"]
+    }
+  ]
+}
diff --git a/.claude-plugin/plugin.json b/.claude-plugin/plugin.json
new file mode 100644
index 0000000..fbf845e
--- /dev/null
+++ b/.claude-plugin/plugin.json
@@ -0,0 +1,46 @@
+{
+  "name": "hydracept",
+  "displayName": "Hydracept",
+  "version": "0.1.9",
+  "description": "Image, audio, video, 3D, and text generation for coding agents through one remote MCP server, with durable jobs, budgets, receipts, and BYOK.",
+  "author": {
+    "name": "Zencode Consulting Inc.",
+    "email": "support@hydracept.com",
+    "url": "https://hydracept.com"
+  },
+  "homepage": "https://hydracept.com/plugin",
+  "repository": "https://github.com/zencodeinc/hydracept-plugin",
+  "license": "MIT",
+  "keywords": [
+    "hydracept",
+    "mcp",
+    "image-generation",
+    "audio-generation",
+    "video-generation",
+    "3d-generation",
+    "text-generation",
+    "game-assets",
+    "sprite-sheet",
+    "durable-jobs",
+    "receipts",
+    "byok"
+  ],
+  "userConfig": {
+    "api_key": {
+      "type": "string",
+      "title": "Hydracept API key",
+      "description": "Workspace API key from https://hydracept.com/start. Stored in your OS credential store, never in settings.json.",
+      "required": true,
+      "sensitive": true
+    }
+  },
+  "mcpServers": {
+    "hydracept": {
+      "type": "http",
+      "url": "https://api.hydracept.com/mcp",
+      "headers": {
+        "Authorization": "Bearer ${user_config.api_key}"
+      }
+    }
+  }
+}
diff --git a/.cursor-plugin/marketplace.json b/.cursor-plugin/marketplace.json
index 94404ba..0ec2666 100644
--- a/.cursor-plugin/marketplace.json
+++ b/.cursor-plugin/marketplace.json
@@ -5,13 +5,13 @@
     "email": "support@hydracept.com"
   },
   "metadata": {
-    "description": "Official Hydracept Cursor plugin (skills, rules, commands, stdio MCP wiring)."
+    "description": "Official Hydracept Cursor plugin (skills, rules, commands, stdio MCP)."
   },
   "plugins": [
     {
       "name": "hydracept",
       "source": ".",
-      "description": "One execution surface for text/reasoning, media, domains, DNS, and other external capabilities, with durable jobs, budgets, receipts, and BYOK."
+      "description": "Give coding agents image, audio, video, 3D, and text generation (plus domains/DNS and other external capabilities) through one Hydracept MCP interface, with durable jobs, budgets, receipts, and BYOK."
     }
   ]
 }
diff --git a/.cursor-plugin/plugin.json b/.cursor-plugin/plugin.json
index c8a3d76..d3a10d5 100644
--- a/.cursor-plugin/plugin.json
+++ b/.cursor-plugin/plugin.json
@@ -1,8 +1,8 @@
 {
   "name": "hydracept",
   "displayName": "Hydracept",
-  "version": "0.1.8",
-  "description": "One execution surface for text/reasoning, media, domains, DNS, and other external capabilities, with durable jobs, budgets, receipts, and BYOK.",
+  "version": "0.1.9",
+  "description": "Give coding agents image, audio, video, 3D, and text generation (plus domains/DNS and other external capabilities) through one Hydracept MCP interface, with durable jobs, budgets, receipts, and BYOK.",
   "author": {
     "name": "Zencode Consulting Inc.",
     "email": "support@hydracept.com"
@@ -13,25 +13,21 @@
   "keywords": [
     "hydracept",
     "mcp",
-    "execution-control-plane",
     "agent-tools",
+    "image-generation",
+    "audio-generation",
+    "video-generation",
+    "3d-generation",
+    "text-generation",
+    "transparent-png",
+    "sprite-sheet",
     "durable-jobs",
     "receipts",
-    "multi-provider",
+    "budgets",
     "byok",
-    "text-generation",
-    "image-generation",
+    "multi-provider",
     "domains",
-    "dns",
-    "game-assets",
-    "cursor",
-    "claude-code",
-    "unity",
-    "gamedev",
-    "sprite-sheet",
-    "transparent-png",
-    "reference-image",
-    "game-ai"
+    "dns"
   ],
   "logo": "assets/logo.png",
   "publisher": "Zencode Consulting Inc.",
@@ -39,25 +35,21 @@
   "tags": [
     "hydracept",
     "mcp",
-    "execution-control-plane",
     "agent-tools",
+    "image-generation",
+    "audio-generation",
+    "video-generation",
+    "3d-generation",
+    "text-generation",
+    "transparent-png",
+    "sprite-sheet",
     "durable-jobs",
     "receipts",
-    "multi-provider",
+    "budgets",
     "byok",
-    "text-generation",
-    "image-generation",
+    "multi-provider",
     "domains",
-    "dns",
-    "game-assets",
-    "cursor",
-    "claude-code",
-    "unity",
-    "gamedev",
-    "sprite-sheet",
-    "transparent-png",
-    "reference-image",
-    "game-ai"
+    "dns"
   ],
   "mcpServers": "./mcp.json"
 }
diff --git a/.github/workflows/validate-manifests.yml b/.github/workflows/validate-manifests.yml
new file mode 100644
index 0000000..fbc0efa
--- /dev/null
+++ b/.github/workflows/validate-manifests.yml
@@ -0,0 +1,49 @@
+name: Validate manifests
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+
+      - name: Install validators
+        run: |
+          npm install -g @anthropic-ai/claude-code @google/gemini-cli
+
+      - name: Parse JSON manifests
+        run: |
+          python3 - <<'PY'
+          import json
+          from pathlib import Path
+
+          paths = [
+              ".cursor-plugin/plugin.json",
+              ".cursor-plugin/marketplace.json",
+              ".claude-plugin/plugin.json",
+              ".claude-plugin/marketplace.json",
+              "gemini-extension.json",
+              "mcp.json",
+              "mcp-registry/server.json",
+          ]
+          for p in paths:
+              json.loads(Path(p).read_text())
+              print(f"OK {p}")
+          PY
+
+      - name: Claude Code plugin validate
+        run: |
+          claude plugin validate --strict .
+          claude plugin validate --strict .claude-plugin/plugin.json
+
+      - name: Gemini CLI extension validate
+        run: gemini extensions validate .
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8c0ee50..f97dcf6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,12 +2,21 @@
 
 ## Unreleased
 
-- Add `mcp-registry/server.json` for the official MCP Registry (`com.hydracept/hydracept`, PyPI stdio + hosted remote)
-- Add `.cursor-plugin/marketplace.json`; point `plugin.json` repository at this repo
-- README: canonical repo note, install/auth, and registry publishing guidance
+## 0.1.9
+
+- Claude Code plugin (`.claude-plugin/`) with hosted MCP `https://api.hydracept.com/mcp` and API key via plugin configure
+- Gemini CLI extension (`gemini-extension.json`)
+- README install sections for Claude Code, Claude Desktop, Google Antigravity, and Gemini CLI
+- CI: validate Claude Code and Gemini CLI manifests on pull requests
 
 ## 0.1.8
 
+- Marketplace listing polish: clearer description and keywords (image/audio/video/3D/text), drop game-only tags
+- README: what's included, install, auth, example prompts, pricing, support
+- `hydracept-image` skill: general-purpose image wording
+- Add `mcp-registry/server.json` for the official MCP Registry (`com.hydracept/hydracept`, PyPI stdio + hosted remote)
+- Add `.cursor-plugin/marketplace.json`; point `plugin.json` repository at this repo
+- README: canonical repo note, install/auth, and registry publishing guidance
 - Stdio MCP (`python -m hydracept mcp serve`) using CLI workspace secrets; no secrets in git
 - Skills, commands, and a rule that never solicits API keys in chat
 - Cursor Marketplace schema: plugin.json + `.cursor-plugin/marketplace.json`
diff --git a/README.md b/README.md
index adb7ede..6a05655 100644
--- a/README.md
+++ b/README.md
@@ -1,50 +1,157 @@
 # Hydracept for Cursor
 
-One execution surface for text/reasoning, media, domains, DNS, and other external capabilities, with durable jobs, budgets, receipts, and BYOK.
+Give Cursor's agent image, audio, video, 3D, and text generation, plus domains/DNS and other external capabilities, through one [Hydracept](https://hydracept.com) MCP interface. Every run is a durable job with budgets, typed artifacts, and an immutable receipt. Bring your own provider keys (BYOK) or use managed execution.
 
-**Canonical repository:** [`zencodeinc/hydracept-plugin`](https://github.com/zencodeinc/hydracept-plugin) (Cursor plugin **0.1.8**). The older [`zencodeinc/hydracept-agent-plugins`](https://github.com/zencodeinc/hydracept-agent-plugins) catalog is retired.
-
-Plugin homepage: https://hydracept.com/plugin
+- Website: https://hydracept.com
+- Plugin page: https://hydracept.com/plugin
+- Python package / MCP server: [`hydracept` on PyPI](https://pypi.org/project/hydracept/)
+- MCP Registry: `com.hydracept/hydracept`
 
 A Zencode product · © Zencode Consulting Inc.
 
+## What's included
+
+| Component | Name | Purpose |
+| --- | --- | --- |
+| MCP server | `hydracept` (`mcp.json`) | Stdio MCP: `python -m hydracept mcp serve`. No secrets in the repo. |
+| Skills | `hydracept`, `hydracept-setup`, `hydracept-image`, `hydracept-sheet`, `hydracept-smoke` | When and how to use Hydracept capabilities; setup; image generation; sprite/icon sheets; opt-in paid smoke test |
+| Commands | `/hydracept-init`, `/hydracept-doctor` | Bootstrap a project; check connection and MCP binding |
+| Rule | `hydracept.mdc` | Never ask for API keys in chat; use canonical init and stdio MCP |
+
 ## Install
 
-- **Cursor Marketplace:** search for **Hydracept** or submit this repo at [cursor.com/marketplace/publish](https://cursor.com/marketplace/publish) after review.
-- **From Git:** clone `https://github.com/zencodeinc/hydracept-plugin` and add the repo as a Cursor plugin (root contains `.cursor-plugin/plugin.json`).
+1. Install **Hydracept** from the Cursor Marketplace (Customize → search "Hydracept"), or test locally by copying this repo into `~/.cursor/plugins/local/hydracept` and reloading the window.
+2. Install the Python package the MCP server runs on:
+
+   ```bash
+   pip install -U hydracept
+   ```
+
+3. **Claude Code:** add marketplace `zencodeinc/hydracept-plugin` and install `hydracept@hydracept` — see [Install in Claude Code](#install-in-claude-code).
 
-Requires the [`hydracept`](https://pypi.org/project/hydracept/) Python package on your machine for stdio MCP (`python -m hydracept …`).
+## Install in Claude Code
 
-## Authentication (project checkout)
+Hydracept ships a Claude Code plugin marketplace in this repository (`.claude-plugin/marketplace.json`).
 
-Do **not** paste `HYDRACEPT_API_KEY` into chat or into **Plugins → Configure** for workspace-bound stdio.
+```text
+/plugin marketplace add zencodeinc/hydracept-plugin
+/plugin install hydracept@hydracept
+```
 
-In a project checkout run:
+Or from your shell:
+
+```bash
+claude plugin marketplace add zencodeinc/hydracept-plugin
+claude plugin install hydracept@hydracept
+```
+
+When the plugin is enabled, Claude Code asks for your **Hydracept API key** (get one at https://hydracept.com/start). The key is stored in your OS credential store, not in `settings.json`, and is sent as `Authorization: Bearer <key>` to the hosted MCP server `https://api.hydracept.com/mcp`. To change it later, run `/plugin configure hydracept@hydracept`.
+
+The plugin adds the Hydracept MCP server plus the Hydracept skills (`/hydracept:hydracept`, `/hydracept:hydracept-image`, and others). To update, run `claude plugin update hydracept@hydracept`.
+
+**MCP server only (no plugin):** with `HYDRACEPT_API_KEY` exported in your shell:
+
+```bash
+claude mcp add --transport http hydracept https://api.hydracept.com/mcp \
+  --header "Authorization: Bearer $HYDRACEPT_API_KEY"
+```
+
+## Install in Claude Desktop
+
+Claude Desktop's `claude_desktop_config.json` starts local (stdio) servers. Use the `hydracept` PyPI package via [`uv`](https://docs.astral.sh/uv/). Open **Settings → Developer → Edit Config** and add:
+
+```json
+{
+  "mcpServers": {
+    "hydracept": {
+      "command": "uvx",
+      "args": ["hydracept@0.4.4", "mcp", "serve"],
+      "env": {
+        "HYDRACEPT_API_KEY": "<your Hydracept API key>"
+      }
+    }
+  }
+}
+```
+
+Restart Claude Desktop. Keep this file private because it holds your key.
+
+**Custom connector (remote):** Hydracept authenticates with an API key, not OAuth. You can add `https://api.hydracept.com/mcp` under **Settings → Connectors → Add custom connector** only if your organization has the beta **Request headers** option. Choose **No sign-in** and add the `authorization` header with the value `Bearer <your key>`. Without that option, use the config above.
+
+## Install in Google Antigravity
+
+Antigravity 2.0, the Antigravity IDE, and the Antigravity CLI (`agy`) all read one MCP config file: `~/.gemini/config/mcp_config.json`. For a single project, use `.agents/mcp_config.json` in the workspace. In the IDE, open **… → MCP Servers → Manage MCP Servers → View raw config** and add:
+
+```json
+{
+  "mcpServers": {
+    "hydracept": {
+      "serverUrl": "https://api.hydracept.com/mcp",
+      "headers": {
+        "Authorization": "Bearer <your Hydracept API key>"
+      }
+    }
+  }
+}
+```
+
+Antigravity requires `serverUrl`; the keys `url` and `httpUrl` don't work there. After saving, refresh **Settings → Customizations → Installed MCP Servers**. If you use a workspace `.agents/mcp_config.json`, add it to `.gitignore` so the key is never committed.
+
+## Install in Gemini CLI
+
+This repository is also a Gemini CLI extension (`gemini-extension.json`):
+
+```bash
+gemini extensions install https://github.com/zencodeinc/hydracept-plugin
+```
+
+The installer asks for your **Hydracept API key** and stores it as a sensitive setting (`HYDRACEPT_API_KEY`). To change it, run `gemini extensions config hydracept`.
+
+## Authentication
+
+Get an account and key at https://hydracept.com/start. Do **not** paste `HYDRACEPT_API_KEY` into chat, and do not put it in **Plugins → Configure** for project checkouts.
+
+In a project checkout, run (or ask the agent to run `/hydracept-init`):
 
 ```bash
 python -m hydracept init --apply --yes --json
 ```
 
-That writes workspace secrets under `.hydracept/` and binds project MCP to stdio (`python -m hydracept mcp serve`). Reload MCP once when init says it is required.
+Init writes workspace secrets under `.hydracept/` (gitignored) and binds project MCP to stdio. If it returns `status: interaction_required`, open the activation URL from the JSON output, then run the suggested `afterCompletion.command`. Reload MCP once if init says it is required. Run `/hydracept-doctor` to verify.
+
+Other clients:
+
+- **Key-only stdio:** `uvx hydracept mcp serve` with `HYDRACEPT_API_KEY` set in the environment.
+- **Hosted MCP (no checkout, e.g. ChatGPT):** `https://api.hydracept.com/mcp` with `Authorization: Bearer <HYDRACEPT_API_KEY>`.
+
+## Example prompts
+
+- "Generate a transparent 512×512 PNG app icon of a paper plane in a flat style and save it to `assets/icon.png`."
+- "Make a cohesive set of 8 UI glyphs (home, search, settings, …) as a sprite sheet and slice it into separate PNGs."
+- "Create a 10-second upbeat background music loop for the landing page."
+- "Generate a short product teaser video from this screenshot."
+- "Produce a low-poly 3D model of a coffee cup as a GLB for the three.js scene."
+- "Translate `locales/en.json` into French and German as a durable job and show me the receipt."
+- "What would it cost to generate 20 hero images? Quote it before running anything."
 
-If init returns `status: interaction_required`, follow the Hydracept activation URL from the JSON output, then run the suggested `afterCompletion.command` (usually the same init with `--wait`).
+Available capabilities depend on the live Hydracept catalog; the agent discovers them with `hydracept_capabilities` / `python -m hydracept capabilities find`.
 
-**Hosted MCP (no checkout):** `https://api.hydracept.com/mcp` with `Authorization: Bearer <HYDRACEPT_API_KEY>`. Get a key at https://hydracept.com/start .
+## Pricing
 
-**Quick key-only stdio:** `uvx hydracept@0.4.4 mcp serve` with `HYDRACEPT_API_KEY` set (see [MCP Registry manifest](./mcp-registry/server.json)).
+The plugin is free and open source. Hydracept execution is billed by Hydracept: BYOK carries a 0% Hydracept service fee; managed execution is provider price plus 6%. See https://hydracept.com.
 
-Commands: `/hydracept-init`, `/hydracept-doctor`.
+## Security
 
-Local CLI fallback (optional): `python -m hydracept agents install --auto`.
+This repository contains no API keys or tokens. Keys stay in `.hydracept/secrets.json` (gitignored) or your environment. Report security issues to support@hydracept.com.
 
 ## MCP Registry
 
-Official registry manifest: [`mcp-registry/server.json`](./mcp-registry/server.json).
+Registry manifest: [`mcp-registry/server.json`](./mcp-registry/server.json) (`com.hydracept/hydracept`, version tracks the PyPI package, not this plugin's semver).
 
-- **Registry name (domain namespace):** `com.hydracept/hydracept` — aligned with the PyPI README `mcp-name` line in the `zencodeinc/hydracept` monorepo (owner verifies **hydracept.com** for the `com.hydracept` namespace).
-- **Manifest version `0.4.4`** tracks the published PyPI MCP server, not the Cursor plugin semver (`0.1.8`).
+## Support
 
-Publishing is manual: validate with `mcp-publisher validate mcp-registry/server.json`, then `cd mcp-registry && mcp-publisher publish` after domain verification and PyPI README ownership are complete. Do not publish the hosted remote until redirect/TLS issues on `https://api.hydracept.com/mcp` are fixed.
+- Email: support@hydracept.com
+- Issues: https://github.com/zencodeinc/hydracept-plugin/issues
 
 ## License
 
diff --git a/gemini-extension.json b/gemini-extension.json
new file mode 100644
index 0000000..f46b912
--- /dev/null
+++ b/gemini-extension.json
@@ -0,0 +1,21 @@
+{
+  "name": "hydracept",
+  "version": "0.1.9",
+  "description": "Image, audio, video, 3D, and text generation for coding agents through one remote MCP server, with durable jobs, budgets, and receipts.",
+  "settings": [
+    {
+      "name": "Hydracept API key",
+      "description": "Workspace API key from https://hydracept.com/start.",
+      "envVar": "HYDRACEPT_API_KEY",
+      "sensitive": true
+    }
+  ],
+  "mcpServers": {
+    "hydracept": {
+      "httpUrl": "https://api.hydracept.com/mcp",
+      "headers": {
+        "Authorization": "Bearer ${HYDRACEPT_API_KEY}"
+      }
+    }
+  }
+}
diff --git a/skills/hydracept-image/SKILL.md b/skills/hydracept-image/SKILL.md
index 4be6684..3f2efaa 100644
--- a/skills/hydracept-image/SKILL.md
+++ b/skills/hydracept-image/SKILL.md
@@ -1,13 +1,13 @@
 ---
 name: hydracept-image
 description: >
-  Generate production game images through Hydracept image.generate.v1 — transparent
-  sprites, icons, variants, and receipted jobs.
+  Generate production images through Hydracept image.generate.v1 — transparent
+  PNGs, icons, sprites, variants, and receipted jobs.
 ---
 
 # Hydracept Image
 
-Production image generation judgment for game assets.
+Production image generation judgment for app, web, and game art (icons, sprites, illustrations, transparent PNGs).
 
 ## Capability
 
@@ -55,7 +55,7 @@ Keep prompts short, product-neutral, and lighting-first. Do not name a provider.
 
 ## Workflow
 
-1. Describe the asset need in game terms, not provider terms
+1. Describe the asset need in product terms (use, size, style), not provider terms
 2. Read `pricingFactors` on `image.generate.v1`. Optional: `hydracept_quote_capability` (`POST /quote`) for a 0.3 `pricing.quote` preview. Do **not** attach a stale `execution.quoteId`.
 3. Submit a job with project context from the workspace. **Omit `execution.quoteId`.** The API seals pricing at admission.
 4. Poll until `succeeded`