diff --git a/bun.lock b/bun.lock
index 5cc2586ed..357d50479 100644
--- a/bun.lock
+++ b/bun.lock
@@ -31,6 +31,7 @@
         "@oh-my-opencode/comment-checker-core": "workspace:*",
         "@oh-my-opencode/hashline-core": "workspace:*",
         "@oh-my-opencode/model-core": "workspace:*",
+        "@oh-my-opencode/omo-codex": "workspace:*",
         "@oh-my-opencode/prompts-core": "workspace:*",
         "@oh-my-opencode/rules-engine": "workspace:*",
         "@oh-my-opencode/utils": "workspace:*",
@@ -109,6 +110,17 @@
         "@oh-my-opencode/utils": "workspace:*",
       },
     },
+    "packages/omo-codex": {
+      "name": "@oh-my-opencode/omo-codex",
+      "version": "0.1.0",
+      "dependencies": {
+        "@oh-my-opencode/utils": "workspace:*",
+        "posthog-node": "^5.34.3",
+      },
+      "devDependencies": {
+        "bun-types": "1.3.14",
+      },
+    },
     "packages/prompts-core": {
       "name": "@oh-my-opencode/prompts-core",
       "version": "0.1.0",
@@ -218,6 +230,8 @@
 
     "@oh-my-opencode/model-core": ["@oh-my-opencode/model-core@workspace:packages/model-core"],
 
+    "@oh-my-opencode/omo-codex": ["@oh-my-opencode/omo-codex@workspace:packages/omo-codex"],
+
     "@oh-my-opencode/prompts-core": ["@oh-my-opencode/prompts-core@workspace:packages/prompts-core"],
 
     "@oh-my-opencode/rules-engine": ["@oh-my-opencode/rules-engine@workspace:packages/rules-engine"],
diff --git a/bunfig.toml b/bunfig.toml
index 665e9a149..deb3170f4 100644
--- a/bunfig.toml
+++ b/bunfig.toml
@@ -1,6 +1,6 @@
 [test]
 preload = ["./test-setup.ts"]
-pathIgnorePatterns = ["packages/web/**", "packages/lsp-tools-mcp/**"]
+pathIgnorePatterns = ["packages/web/**", "packages/lsp-tools-mcp/**", "packages/omo-codex/plugin/**"]
 
 [loader]
 ".md" = "text"
diff --git a/package.json b/package.json
index f497f7442..86beb8a93 100644
--- a/package.json
+++ b/package.json
@@ -15,11 +15,14 @@
     "packages/comment-checker-core",
     "packages/hashline-core",
     "packages/boulder-state",
-    "packages/agents-md-core"
+    "packages/agents-md-core",
+    "packages/omo-codex"
   ],
   "bin": {
     "oh-my-opencode": "bin/oh-my-opencode.js",
-    "oh-my-openagent": "bin/oh-my-opencode.js"
+    "oh-my-openagent": "bin/oh-my-opencode.js",
+    "omo": "bin/oh-my-opencode.js",
+    "lazycodex": "bin/oh-my-opencode.js"
   },
   "files": [
     "dist",
@@ -30,7 +33,10 @@
     ".agents/command",
     ".agents/skills",
     "packages/lsp-tools-mcp/dist",
-    "packages/ast-grep-mcp/dist"
+    "packages/ast-grep-mcp/dist",
+    "packages/omo-codex/marketplace.json",
+    "packages/omo-codex/plugin",
+    "packages/omo-codex/scripts"
   ],
   "exports": {
     ".": {
@@ -54,7 +60,7 @@
     "prepublishOnly": "bun run clean && bun run build:lsp-tools-mcp && bun run build",
     "test:model-capabilities": "bun test src/shared/model-capability-aliases.test.ts src/shared/model-capability-guardrails.test.ts src/shared/model-capabilities.test.ts src/cli/doctor/checks/model-resolution.test.ts --bail",
     "typecheck": "tsgo --noEmit && bun run typecheck:packages",
-    "typecheck:packages": "tsgo --noEmit -p packages/rules-engine/tsconfig.json && tsgo --noEmit -p packages/ast-grep-core/tsconfig.json && tsgo --noEmit -p packages/ast-grep-mcp/tsconfig.json && tsgo --noEmit -p packages/utils/tsconfig.json && tsgo --noEmit -p packages/model-core/tsconfig.json && tsgo --noEmit -p packages/prompts-core/tsconfig.json && tsgo --noEmit -p packages/comment-checker-core/tsconfig.json && tsgo --noEmit -p packages/hashline-core/tsconfig.json && tsgo --noEmit -p packages/boulder-state/tsconfig.json && tsgo --noEmit -p packages/agents-md-core/tsconfig.json",
+    "typecheck:packages": "tsgo --noEmit -p packages/rules-engine/tsconfig.json && tsgo --noEmit -p packages/ast-grep-core/tsconfig.json && tsgo --noEmit -p packages/ast-grep-mcp/tsconfig.json && tsgo --noEmit -p packages/utils/tsconfig.json && tsgo --noEmit -p packages/model-core/tsconfig.json && tsgo --noEmit -p packages/prompts-core/tsconfig.json && tsgo --noEmit -p packages/comment-checker-core/tsconfig.json && tsgo --noEmit -p packages/hashline-core/tsconfig.json && tsgo --noEmit -p packages/boulder-state/tsconfig.json && tsgo --noEmit -p packages/agents-md-core/tsconfig.json && tsgo --noEmit -p packages/omo-codex/tsconfig.json",
     "typecheck:script": "tsgo --noEmit -p script/tsconfig.json",
     "test": "bun test",
     "build:ast-grep-mcp": "bun run --cwd packages/ast-grep-mcp build"
@@ -105,6 +111,7 @@
     "@oh-my-opencode/comment-checker-core": "workspace:*",
     "@oh-my-opencode/hashline-core": "workspace:*",
     "@oh-my-opencode/model-core": "workspace:*",
+    "@oh-my-opencode/omo-codex": "workspace:*",
     "@oh-my-opencode/prompts-core": "workspace:*",
     "@oh-my-opencode/rules-engine": "workspace:*",
     "@oh-my-opencode/utils": "workspace:*",
diff --git a/packages/omo-codex/README.md b/packages/omo-codex/README.md
new file mode 100644
index 000000000..ceca21223
--- /dev/null
+++ b/packages/omo-codex/README.md
@@ -0,0 +1,56 @@
+# @oh-my-opencode/omo-codex
+
+Codex harness adapter for **oh-my-openagent**. Brings the OMO experience (rules injection, comment checker, LSP MCP, ultrawork, ultragoal) into [OpenAI Codex CLI](https://github.com/openai/codex) through Codex's native plugin system.
+
+## Layout
+
+| Path | Purpose |
+|------|---------|
+| `plugin/` | Vendored Codex plugin namespace `omo` with 5 components. Shipped to the user via `~/.codex/plugins/cache/`. |
+| `marketplace.json` | Codex marketplace manifest. Identifies `omo` as the single installable plugin. |
+| `scripts/` | Node ESM build scripts (port of the original `codex-plugins/scripts/install-local.mjs`). |
+| `src/` | TypeScript runtime: installer + telemetry consumed by the omodex CLI. |
+| `MARKETPLACE.md` | Vendored upstream marketplace README. |
+
+## Components Vendored
+
+- `rules` (TypeScript) - injects `AGENTS.md` / `CLAUDE.md` / `.omo/rules/**` into context via `SessionStart`, `UserPromptSubmit`, `PostToolUse`, `PostCompact`.
+- `comment-checker` (TypeScript) - runs `@code-yeongyu/comment-checker` after `apply_patch` / `edit` / `write` tool use.
+- `lsp` (TypeScript + LSP MCP) - exposes LSP diagnostics, navigation, symbols, rename via MCP + post-edit hooks.
+- `ultrawork` (Python) - keyword detector (`ulw` / `ultrawork`) that injects the full ultrawork directive, plus a `SessionStart` hook that syncs bundled agent TOML files into `CODEX_HOME/agents`.
+- `ultragoal` (TypeScript) - durable multi-goal orchestration backed by `.omo/ultragoal/` evidence audit.
+
+## Install
+
+End users invoke through the omodex CLI:
+
+```bash
+bunx omo install --codex=yes
+# or, equivalently:
+bunx oh-my-opencode install --codex=yes
+bunx oh-my-openagent install --codex=yes
+```
+
+The installer copies the built plugin into `~/.codex/plugins/cache/code-yeongyu-codex-plugins/omo/<version>/`, enables it in `~/.codex/config.toml`, and links the per-component binaries into `~/.local/bin/` (or `CODEX_LOCAL_BIN_DIR`).
+
+## Telemetry
+
+Anonymous telemetry uses the same PostHog project as oh-my-openagent but emits the distinct event `omo_codex_daily_active`. Opt out with:
+
+```bash
+export OMO_CODEX_DISABLE_POSTHOG=1
+# or globally for every OMO product:
+export OMO_DISABLE_POSTHOG=1
+```
+
+See `/Users/yeongyu/local-workspaces/omodex/docs/legal/privacy-policy.md` for the full disclosure.
+
+## Provenance
+
+Vendored from [`code-yeongyu/codex-plugins`](https://github.com/code-yeongyu/codex-plugins) at the snapshot present in `/Users/yeongyu/local-workspaces/codex-plugins/` on 2026-05-25. Per-component upstream:
+
+- [code-yeongyu/codex-rules](https://github.com/code-yeongyu/codex-rules)
+- [code-yeongyu/codex-comment-checker](https://github.com/code-yeongyu/codex-comment-checker)
+- [code-yeongyu/codex-lsp](https://github.com/code-yeongyu/codex-lsp)
+- [code-yeongyu/codex-ultrawork](https://github.com/code-yeongyu/codex-ultrawork)
+- [code-yeongyu/codex-ultragoal](https://github.com/code-yeongyu/codex-ultragoal)
diff --git a/packages/omo-codex/index.d.ts b/packages/omo-codex/index.d.ts
new file mode 100644
index 000000000..e910bb060
--- /dev/null
+++ b/packages/omo-codex/index.d.ts
@@ -0,0 +1 @@
+export * from "./src/index";
diff --git a/packages/omo-codex/package.json b/packages/omo-codex/package.json
new file mode 100644
index 000000000..b0780791e
--- /dev/null
+++ b/packages/omo-codex/package.json
@@ -0,0 +1,29 @@
+{
+  "name": "@oh-my-opencode/omo-codex",
+  "version": "0.1.0",
+  "type": "module",
+  "private": true,
+  "description": "Codex harness adapter for oh-my-openagent. Vendored Codex plugin namespace (omo) + TypeScript installer + telemetry.",
+  "exports": {
+    ".": {
+      "types": "./index.d.ts",
+      "import": "./src/index.ts"
+    },
+    "./telemetry": "./src/telemetry/index.ts",
+    "./marketplace.json": "./marketplace.json"
+  },
+  "types": "./index.d.ts",
+  "scripts": {
+    "typecheck": "tsgo --noEmit -p tsconfig.json",
+    "test": "bun test src/**/*.test.ts",
+    "build:plugin": "node ./scripts/build-plugin.mjs",
+    "sync:skills": "node plugin/scripts/sync-skills.mjs"
+  },
+  "dependencies": {
+    "@oh-my-opencode/utils": "workspace:*",
+    "posthog-node": "^5.34.3"
+  },
+  "devDependencies": {
+    "bun-types": "1.3.14"
+  }
+}
diff --git a/packages/omo-codex/src/index.ts b/packages/omo-codex/src/index.ts
new file mode 100644
index 000000000..fecc03d28
--- /dev/null
+++ b/packages/omo-codex/src/index.ts
@@ -0,0 +1,2 @@
+export * from "./telemetry"
+export * from "./install"
diff --git a/packages/omo-codex/src/install/index.ts b/packages/omo-codex/src/install/index.ts
new file mode 100644
index 000000000..190e7fe7c
--- /dev/null
+++ b/packages/omo-codex/src/install/index.ts
@@ -0,0 +1,4 @@
+// Codex install module entry point. Implemented in subsequent commits.
+// Hosts the TypeScript port of scripts/install-local.mjs invoked from the
+// omodex CLI when the user passes `--codex=yes` to `bunx omo install`.
+export {}
diff --git a/packages/omo-codex/tsconfig.json b/packages/omo-codex/tsconfig.json
new file mode 100644
index 000000000..7a69d1222
--- /dev/null
+++ b/packages/omo-codex/tsconfig.json
@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "lib": ["ESNext"],
+    "types": ["bun-types"]
+  },
+  "include": ["src/**/*"]
+}