Add setup-codex-chrome-native curated skill

skills/.curated/setup-codex-chrome-native/LICENSE.txt

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skills/.curated/setup-codex-chrome-native/SKILL.md

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+---
+name: setup-codex-chrome-native
+description: Set up and repair Codex CLI connectivity to the codex-chrome extension by installing native messaging manifests and configuring the codex-extension MCP server entry in standalone mode only (retail Codex + installed extension). Use when users ask to connect Codex CLI to the extension, reinstall native host scripts, switch browser target for Chrome or Chromium, or troubleshoot disconnected native host or MCP wiring.
+---
+
+# Setup Codex Chrome Native
+
+## Overview
+
+Install, reconnect, verify, and uninstall the codex-chrome native host integration used by `codex-cli`.
+The bundled script is standalone-only: no source repository checkout is required.
+
+## Workflow
+
+1. Collect required inputs:
+   - Browser target (`chrome`, `chromium`, or `all`)
+   - Optional extension id override (`--extension-id`)
+   - Optional explicit schemas path (`--tool-schemas`) when auto-detection fails
+2. Run `scripts/manage_codex_chrome_native.sh` with one of:
+   - `setup` to install native host + configure MCP
+   - `status` to check manifests, extension/schema detection, and MCP visibility
+   - `uninstall` to remove manifests (and optionally MCP entry)
+3. For `setup`, instruct the user to confirm Chrome extension loading:
+   - Browser target (`chrome`, `chromium`, or `all`)
+   - Open `chrome://extensions`
+   - Ensure `codex-extension` is installed/enabled
+   - Check extension Options and confirm native host status is connected
+4. If setup fails, read `references/native-setup.md` and follow the matching troubleshooting path.
+5. If Codex reports MCP startup/initialize handshake failures, run:
+   - `./scripts/manage_codex_chrome_native.sh setup --skip-install`
+   - then reload/reconnect the extension in `chrome://extensions`.
+
+## Commands
+
+Run from this skill directory or call with an absolute path:
+
+```bash
+# Setup using defaults
+./scripts/manage_codex_chrome_native.sh setup
+
+# Setup against Chromium and explicit extension id
+./scripts/manage_codex_chrome_native.sh setup --browser chromium --extension-id <extension-id>
+
+# Standalone setup with explicit schemas path
+./scripts/manage_codex_chrome_native.sh setup --extension-id <extension-id> --tool-schemas <path/to/tool-schemas.json>
+
+# Check setup state
+./scripts/manage_codex_chrome_native.sh status
+
+# Uninstall and remove codex-extension MCP entry
+./scripts/manage_codex_chrome_native.sh uninstall --remove-mcp
+```
+
+## Resources
+
+- `scripts/manage_codex_chrome_native.sh`: deterministic wrapper around extension setup/uninstall/status.
+- `references/native-setup.md`: manual commands, manifest locations, and troubleshooting.
+
+## Notes
+
+- Prefer `setup` then `status` before deeper debugging.
+- Keep changes scoped to native host setup and MCP registration only.
+- Report exact failing command and stderr when escalation is needed.

skills/.curated/setup-codex-chrome-native/agents/openai.yaml

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+interface:
+  display_name: "Codex Chrome Native Setup"
+  short_description: "Set up Codex Chrome native host + MCP"
+  default_prompt: "Use $setup-codex-chrome-native to install and verify the Codex Chrome native host and Codex MCP connection."

skills/.curated/setup-codex-chrome-native/references/native-setup.md

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+# Native Setup Reference
+
+## Inputs
+
+- `browser`: `chrome`, `chromium`, or `all`
+- `extension_id`: optional override when extension auto-detection fails
+- `tool_schemas`: optional explicit `tool-schemas.json` path
+
+## Preferred command paths
+
+Use the bundled script first:
+
+```bash
+./scripts/manage_codex_chrome_native.sh setup
+./scripts/manage_codex_chrome_native.sh status
+./scripts/manage_codex_chrome_native.sh uninstall --remove-mcp
+```
+
+## Verification checklist
+
+1. Native host manifest exists:
+   - `~/Library/Application Support/Google/Chrome/NativeMessagingHosts/com.openai.codex_experimental_extension.json`
+   - `~/Library/Application Support/Chromium/NativeMessagingHosts/com.openai.codex_experimental_extension.json` (if using Chromium)
+2. `codex mcp list` includes entry `codex-extension` with URL `http://127.0.0.1:8787/mcp`.
+3. Extension is installed in Chrome and options show native status connected.
+4. `status` output reports standalone wrapper at `~/Library/Application Support/CodexExtension/codex-native-host-shim-standalone.sh`.
+
+## Troubleshooting
+
+### Missing extension id
+
+Symptoms:
+- setup script fails with message about missing extension id.
+
+Fix:
+- pass `--extension-id <id>` to the bundled script.
+
+### Node or npm not available
+
+Symptoms:
+- `Missing required command: node` or `npm`.
+
+Fix:
+- install Node.js and rerun setup.
+
+### MCP entry missing
+
+Symptoms:
+- native host manifest exists but `codex mcp list` does not show `codex-extension`.
+
+Fix:
+- rerun setup.
+- if still missing, run:
+  - `codex mcp add codex-extension --url http://127.0.0.1:8787/mcp`
+  - `codex mcp list`
+
+### Extension still disconnected
+
+Symptoms:
+- extension options show disconnected after setup.
+
+Fix:
+1. Open `chrome://extensions`, enable Developer Mode, reload extension.
+2. Ensure `codex-extension` is installed/enabled.
+3. Run `./scripts/manage_codex_chrome_native.sh status` and verify manifest presence.
+
+### Tool schemas path not found (standalone mode)
+
+Symptoms:
+- setup fails with `Could not locate tool-schemas.json`.
+
+Fix:
+1. Confirm extension is installed in the selected browser profile.
+2. Provide explicit schemas path:
+   - `./scripts/manage_codex_chrome_native.sh setup --extension-id <id> --tool-schemas <path/to/tool-schemas.json>`
+
+### MCP startup handshake fails after idle
+
+Symptoms:
+- Codex shows errors similar to:
+  - `MCP startup failed: handshaking with MCP server failed`
+  - `error decoding response body`
+
+Cause:
+- A long-lived `mcp-shim` process can keep stale session state and reject a fresh initialize request.
+
+Fix:
+1. Run:
+   - `./scripts/manage_codex_chrome_native.sh setup --skip-install`
+2. Reload the extension from `chrome://extensions` (or click reconnect in extension options).
+3. Re-run the command in Codex.

skills/.curated/setup-codex-chrome-native/scripts/manage_codex_chrome_native.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+HOST_NAME="com.openai.codex_experimental_extension"
+WRAPPER_DIR="$HOME/Library/Application Support/CodexExtension"
+STANDALONE_DIR="$WRAPPER_DIR/standalone-mcp-shim"
+STANDALONE_WRAPPER="$WRAPPER_DIR/codex-native-host-shim-standalone.sh"
+
+usage() {
+  cat <<'USAGE'
+Usage:
+  manage_codex_chrome_native.sh <setup|status|uninstall> [options]
+
+Options:
+  --browser <target>      chrome | chromium | all (default: chrome)
+  --extension-id <id>     Extension id override
+  --tool-schemas <path>   Explicit tool-schemas.json path
+  --skip-install          Skip npm install during setup
+  --remove-mcp            Remove codex-extension MCP entry on uninstall
+  -h, --help              Show this message
+USAGE
+}
+
+fail() {
+  echo "[setup-codex-chrome-native] $*" >&2
+  exit 1
+}
+
+info() {
+  echo "[setup-codex-chrome-native] $*"
+}
+
+ensure_cmd() {
+  local cmd="$1"
+  command -v "$cmd" >/dev/null 2>&1 || fail "Missing required command: $cmd"
+}
+
+manifest_paths() {
+  local browser="$1"
+  if [[ "$browser" == "chrome" || "$browser" == "all" ]]; then
+    printf '%s\n' "$HOME/Library/Application Support/Google/Chrome/NativeMessagingHosts/$HOST_NAME.json"
+  fi
+  if [[ "$browser" == "chromium" || "$browser" == "all" ]]; then
+    printf '%s\n' "$HOME/Library/Application Support/Chromium/NativeMessagingHosts/$HOST_NAME.json"
+  fi
+}
+
+extension_roots() {
+  local browser="$1"
+  if [[ "$browser" == "chrome" || "$browser" == "all" ]]; then
+    printf '%s\n' "$HOME/Library/Application Support/Google/Chrome/Default/Extensions"
+  fi
+  if [[ "$browser" == "chromium" || "$browser" == "all" ]]; then
+    printf '%s\n' "$HOME/Library/Application Support/Chromium/Default/Extensions"
+  fi
+}
+
+show_port_status() {
+  if ! command -v lsof >/dev/null 2>&1; then
+    return 0
+  fi
+
+  local listeners
+  listeners="$(lsof -nP -iTCP:8787 -sTCP:LISTEN 2>/dev/null || true)"
+  if [[ -n "$listeners" ]]; then
+    info "Port 8787 listener(s):"
+    echo "$listeners"
+  else
+    info "No listener currently bound to TCP 8787."
+  fi
+}
+
+cleanup_stale_shim() {
+  local patterns
+  patterns=(
+    'mcp-shim/dist/index.js'
+    'standalone-mcp-shim/index.mjs'
+    'codex-native-host-shim-standalone.sh'
+  )
+
+  local pattern
+  for pattern in "${patterns[@]}"; do
+    if pgrep -f "$pattern" >/dev/null 2>&1; then
+      info "Stopping existing process(es) matching: $pattern"
+      pkill -f "$pattern" 2>/dev/null || true
+    fi
+  done
+  sleep 1
+}
+
+latest_version_dir() {
+  local base_dir="$1"
+  [[ -d "$base_dir" ]] || return 1
+
+  local latest=""
+  latest="$(find "$base_dir" -mindepth 1 -maxdepth 1 -type d -print 2>/dev/null | sort -V | tail -n 1 || true)"
+  [[ -n "$latest" ]] || return 1
+  printf '%s\n' "$latest"
+}
+
+detect_extension_id() {
+  local browser="$1"
+  local override_id="$2"
+
+  if [[ -n "$override_id" ]]; then
+    printf '%s\n' "$override_id"
+    return 0
+  fi
+
+  local root
+  while IFS= read -r root; do
+    [[ -d "$root" ]] || continue
+    local id_dir
+    while IFS= read -r id_dir; do
+      [[ -d "$id_dir" ]] || continue
+      local manifest_dir
+      manifest_dir="$(latest_version_dir "$id_dir" || true)"
+      [[ -n "$manifest_dir" ]] || continue
+      local manifest_path="$manifest_dir/manifest.json"
+      [[ -f "$manifest_path" ]] || continue
+      if grep -q '"name"[[:space:]]*:[[:space:]]*"codex-extension"' "$manifest_path"; then
+        basename "$id_dir"
+        return 0
+      fi
+    done < <(find "$root" -mindepth 1 -maxdepth 1 -type d -print 2>/dev/null | sort)
+  done < <(extension_roots "$browser")
+
+  return 1
+}
+
+resolve_tool_schemas_path() {
+  local browser="$1"
+  local extension_id="$2"
+  local override_path="$3"
+
+  if [[ -n "$override_path" ]]; then
+    [[ -f "$override_path" ]] || fail "--tool-schemas path does not exist: $override_path"
+    printf '%s\n' "$override_path"
+    return 0
+  fi
+
+  local root
+  while IFS= read -r root; do
+    local id_root="$root/$extension_id"
+    [[ -d "$id_root" ]] || continue
+    local ver_dir
+    ver_dir="$(latest_version_dir "$id_root" || true)"
+    [[ -n "$ver_dir" ]] || continue
+    local schemas="$ver_dir/tool-schemas.json"
+    if [[ -f "$schemas" ]]; then
+      printf '%s\n' "$schemas"
+      return 0
+    fi
+  done < <(extension_roots "$browser")
+
+  return 1
+}
+
+configure_codex_mcp() {
+  if ! command -v codex >/dev/null 2>&1; then
+    info "codex CLI not found on PATH; skipping MCP entry configuration."
+    return 0
+  fi
+
+  codex mcp remove codex-extension >/dev/null 2>&1 || true
+  codex mcp add codex-extension --url http://127.0.0.1:8787/mcp
+}
+
+install_native_manifest() {
+  local browser="$1"
+  local extension_id="$2"
+  local host_path="$3"
+
+  while IFS= read -r manifest; do
+    mkdir -p "$(dirname "$manifest")"
+    cat > "$manifest" <<JSON
+{
+  "name": "$HOST_NAME",
+  "description": "Codex Experimental Extension Native Host",
+  "path": "$host_path",
+  "type": "stdio",
+  "allowed_origins": [
+    "chrome-extension://$extension_id/"
+  ]
+}
+JSON
+    info "Installed native host manifest: $manifest"
+  done < <(manifest_paths "$browser")
+}
+
+remove_native_manifests() {
+  local browser="$1"
+  while IFS= read -r manifest; do
+    if [[ -f "$manifest" ]]; then
+      rm -f "$manifest"
+      info "Removed manifest: $manifest"
+    else
+      info "Manifest not found (skipped): $manifest"
+    fi
+  done < <(manifest_paths "$browser")
+}
+
+setup_standalone_mode() {
+  local browser="$1"
+  local extension_id="$2"
+  local tool_schemas="$3"
+  local skip_install="$4"
+  local script_dir="$5"
+
+  ensure_cmd node
+  ensure_cmd npm
+
+  cleanup_stale_shim
+
+  mkdir -p "$STANDALONE_DIR"
+  cp "$script_dir/standalone-mcp-shim.mjs" "$STANDALONE_DIR/index.mjs"
+
+  cat > "$STANDALONE_DIR/package.json" <<'JSON'
+{
+  "name": "codex-extension-standalone-shim",
+  "private": true,
+  "type": "module",
+  "version": "0.1.0",
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.0.0"
+  }
+}
+JSON
+
+  if [[ "$skip_install" -eq 0 ]]; then
+    info "Installing standalone shim dependencies..."
+    npm --prefix "$STANDALONE_DIR" install
+  else
+    info "Skipping npm install (--skip-install)."
+  fi
+
+  [[ -d "$STANDALONE_DIR/node_modules/@modelcontextprotocol/sdk" ]] || \
+    fail "Standalone dependencies missing. Re-run setup without --skip-install."
+
+  local node_bin
+  node_bin="$(command -v node || true)"
+  [[ -n "$node_bin" ]] || fail "Unable to locate node on PATH"
+
+  mkdir -p "$WRAPPER_DIR"
+  cat > "$STANDALONE_WRAPPER" <<WRAP
+#!/bin/bash
+export CODEX_TOOL_SCHEMAS_PATH="$tool_schemas"
+exec "$node_bin" "$STANDALONE_DIR/index.mjs" "\$@"
+WRAP
+  chmod +x "$STANDALONE_WRAPPER"
+  info "Installed standalone host wrapper: $STANDALONE_WRAPPER"
+
+  install_native_manifest "$browser" "$extension_id" "$STANDALONE_WRAPPER"
+
+  configure_codex_mcp
+}
+
+status_report() {
+  local browser="$1"
+  local extension_id="$2"
+  local tool_schemas="$3"
+
+  local found=0
+  while IFS= read -r manifest; do
+    if [[ -f "$manifest" ]]; then
+      info "Manifest found: $manifest"
+      found=1
+    else
+      info "Manifest not found: $manifest"
+    fi
+  done < <(manifest_paths "$browser")
+  if [[ "$found" -eq 0 ]]; then
+    info "No manifests found for target=$browser."
+  fi
+
+  if [[ -n "$extension_id" ]]; then
+    info "Detected extension id: $extension_id"
+  else
+    info "Could not auto-detect extension id from installed browser extensions."
+  fi
+
+  if [[ -n "$tool_schemas" ]]; then
+    info "Tool schemas path: $tool_schemas"
+  else
+    info "Tool schemas file not detected."
+  fi
+
+  if [[ -f "$STANDALONE_WRAPPER" ]]; then
+    info "Standalone wrapper present: $STANDALONE_WRAPPER"
+  fi
+
+  if command -v codex >/dev/null 2>&1; then
+    info "Codex MCP entries:"
+    codex mcp list || true
+  else
+    info "codex CLI not found on PATH; skipping MCP listing."
+  fi
+
+  show_port_status
+}
+
+uninstall_all() {
+  local browser="$1"
+  local remove_mcp="$2"
+
+  remove_native_manifests "$browser"
+
+  local wrappers=(
+    "$WRAPPER_DIR/codex-native-host.sh"
+    "$WRAPPER_DIR/codex-native-host-shim.sh"
+    "$WRAPPER_DIR/codex-native-host-fake.sh"
+    "$STANDALONE_WRAPPER"
+  )
+  local wrapper
+  for wrapper in "${wrappers[@]}"; do
+    if [[ -f "$wrapper" ]]; then
+      rm -f "$wrapper"
+      info "Removed wrapper: $wrapper"
+    fi
+  done
+
+  if [[ -d "$STANDALONE_DIR" ]]; then
+    rm -rf "$STANDALONE_DIR"
+    info "Removed standalone shim directory: $STANDALONE_DIR"
+  fi
+
+  if [[ "$remove_mcp" -eq 1 ]]; then
+    if command -v codex >/dev/null 2>&1; then
+      if codex mcp remove codex-extension >/dev/null 2>&1; then
+        info "Removed Codex MCP entry: codex-extension"
+      else
+        info "Codex MCP entry not removed (may not exist): codex-extension"
+      fi
+    else
+      info "codex CLI not found; skipping MCP removal"
+    fi
+  fi
+}
+
+MODE="${1:-}"
+if [[ -z "$MODE" || "$MODE" == "--help" || "$MODE" == "-h" ]]; then
+  usage
+  exit 0
+fi
+shift || true
+
+BROWSER="chrome"
+EXTENSION_ID=""
+TOOL_SCHEMAS=""
+SKIP_INSTALL=0
+REMOVE_MCP=0
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --browser)
+      [[ $# -ge 2 ]] || fail "--browser requires a value"
+      BROWSER="$2"
+      shift 2
+      ;;
+    --extension-id)
+      [[ $# -ge 2 ]] || fail "--extension-id requires a value"
+      EXTENSION_ID="$2"
+      shift 2
+      ;;
+    --tool-schemas)
+      [[ $# -ge 2 ]] || fail "--tool-schemas requires a value"
+      TOOL_SCHEMAS="$2"
+      shift 2
+      ;;
+    --skip-install)
+      SKIP_INSTALL=1
+      shift
+      ;;
+    --remove-mcp)
+      REMOVE_MCP=1
+      shift
+      ;;
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    *)
+      fail "Unknown argument: $1"
+      ;;
+  esac
+done
+
+case "$MODE" in
+  setup|status|uninstall) ;;
+  *) fail "Unknown mode: $MODE" ;;
+esac
+
+case "$BROWSER" in
+  chrome|chromium|all) ;;
+  *) fail "Invalid browser target: $BROWSER (expected chrome|chromium|all)" ;;
+esac
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd -P)"
+
+info "Mode: $MODE"
+info "Implementation: standalone"
+info "Browser target: $BROWSER"
+
+if [[ "$MODE" == "setup" ]]; then
+  resolved_extension_id="$(detect_extension_id "$BROWSER" "$EXTENSION_ID" || true)"
+  [[ -n "$resolved_extension_id" ]] || fail "Could not detect Codex extension id. Pass --extension-id <id>."
+  resolved_tool_schemas="$(resolve_tool_schemas_path "$BROWSER" "$resolved_extension_id" "$TOOL_SCHEMAS" || true)"
+  [[ -n "$resolved_tool_schemas" ]] || fail "Could not locate tool-schemas.json. Pass --tool-schemas <path>."
+
+  setup_standalone_mode "$BROWSER" "$resolved_extension_id" "$resolved_tool_schemas" "$SKIP_INSTALL" "$SCRIPT_DIR"
+
+  info "Setup complete."
+  info "Next: open chrome://extensions, reload the codex-extension, then verify in extension options."
+  status_report "$BROWSER" "${resolved_extension_id:-$EXTENSION_ID}" "${resolved_tool_schemas:-$TOOL_SCHEMAS}"
+  exit 0
+fi
+
+if [[ "$MODE" == "status" ]]; then
+  resolved_extension_id="$(detect_extension_id "$BROWSER" "$EXTENSION_ID" || true)"
+  resolved_tool_schemas=""
+  if [[ -n "$resolved_extension_id" ]]; then
+    resolved_tool_schemas="$(resolve_tool_schemas_path "$BROWSER" "$resolved_extension_id" "$TOOL_SCHEMAS" || true)"
+  fi
+  status_report "$BROWSER" "$resolved_extension_id" "$resolved_tool_schemas"
+  exit 0
+fi
+
+if [[ "$MODE" == "uninstall" ]]; then
+  uninstall_all "$BROWSER" "$REMOVE_MCP"
+  info "Uninstall complete."
+fi

skills/.curated/setup-codex-chrome-native/scripts/standalone-mcp-shim.mjs

@@ -0,0 +1,374 @@
+#!/usr/bin/env node
+
+import fs from 'node:fs'
+import { randomUUID } from 'node:crypto'
+import { createServer } from 'node:http'
+import { stdin, stdout, stderr, env } from 'node:process'
+
+import { Server } from '@modelcontextprotocol/sdk/server/index.js'
+import { StreamableHTTPServerTransport } from '@modelcontextprotocol/sdk/server/streamableHttp.js'
+import { CallToolRequestSchema, ListToolsRequestSchema } from '@modelcontextprotocol/sdk/types.js'
+
+const MAX_MESSAGE_BYTES = Number(env.CODEX_SHIM_MAX_MESSAGE_BYTES ?? 8 * 1024 * 1024)
+const TOOL_TIMEOUT_MS = Number(env.CODEX_SHIM_TOOL_TIMEOUT_MS ?? 30_000)
+const MCP_PORT = Number(env.CODEX_MCP_PORT ?? 8787)
+const MCP_HOST = env.CODEX_MCP_HOST ?? '127.0.0.1'
+const MCP_AUTH_TOKEN = env.CODEX_MCP_AUTH_TOKEN
+const CODEX_CLIENT_ID = env.CODEX_CLIENT_ID
+const TOOL_SCHEMAS_PATH = env.CODEX_TOOL_SCHEMAS_PATH
+const MCP_ALLOWED_ORIGINS = env.CODEX_MCP_ALLOWED_ORIGINS
+  ? env.CODEX_MCP_ALLOWED_ORIGINS.split(',').map((value) => value.trim()).filter(Boolean)
+  : []
+
+/** @typedef {null | boolean | number | string | Json[] | { [k: string]: Json }} Json */
+
+/**
+ * @typedef {{
+ *   request: { tool: string, args: Json, clientId: string, timeoutMs: number },
+ *   resolve: (value: { content: Json, isError: boolean }) => void,
+ *   reject: (reason: Error) => void,
+ *   timeoutId: NodeJS.Timeout
+ * }} PendingToolRequest
+ */
+
+/** @type {Buffer} */
+let nativeBuffer = Buffer.alloc(0)
+/** @type {PendingToolRequest | null} */
+let inFlight = null
+/** @type {PendingToolRequest[]} */
+const queue = []
+
+function log(message, extra) {
+  const payload = extra ? `${message} ${JSON.stringify(extra)}` : message
+  stderr.write(`[standalone-mcp-shim] ${payload}\n`)
+}
+
+function writeNativeMessage(msg) {
+  const json = Buffer.from(JSON.stringify(msg), 'utf8')
+  const header = Buffer.alloc(4)
+  header.writeUInt32LE(json.length, 0)
+  stdout.write(Buffer.concat([header, json]))
+}
+
+function dispatch(entry) {
+  writeNativeMessage({
+    type: 'tool_request',
+    method: 'execute_tool',
+    params: {
+      tool: entry.request.tool,
+      args: entry.request.args,
+      client_id: entry.request.clientId,
+    },
+  })
+}
+
+function dispatchNext() {
+  const next = queue.shift() ?? null
+  if (!next) return
+  inFlight = next
+  dispatch(next)
+}
+
+function failInFlight(error) {
+  if (!inFlight) return
+  const entry = inFlight
+  clearTimeout(entry.timeoutId)
+  inFlight = null
+  entry.reject(error)
+  dispatchNext()
+}
+
+/**
+ * @param {string} tool
+ * @param {Json} args
+ * @param {string} clientId
+ * @param {number=} timeoutMs
+ * @returns {Promise<{content: Json, isError: boolean}>}
+ */
+function sendToolRequest(tool, args, clientId, timeoutMs = TOOL_TIMEOUT_MS) {
+  return new Promise((resolve, reject) => {
+    const timeoutId = setTimeout(() => {
+      failInFlight(new Error(`Tool request timed out after ${timeoutMs}ms`))
+    }, timeoutMs)
+
+    const entry = {
+      request: { tool, args, clientId, timeoutMs },
+      resolve,
+      reject,
+      timeoutId,
+    }
+
+    if (inFlight) {
+      queue.push(entry)
+      return
+    }
+    inFlight = entry
+    dispatch(entry)
+  })
+}
+
+function handleToolResponse(msg) {
+  if (!inFlight) {
+    log('tool_response without pending request', msg)
+    return
+  }
+  const entry = inFlight
+  clearTimeout(entry.timeoutId)
+  inFlight = null
+  const isError = Boolean(msg.error)
+  const content = msg.error?.content ?? msg.result?.content ?? null
+  entry.resolve({ content, isError })
+  dispatchNext()
+}
+
+function handleNativeMessage(msg) {
+  switch (msg?.type) {
+    case 'ping':
+      writeNativeMessage({ type: 'pong' })
+      return
+    case 'get_status':
+      writeNativeMessage({ type: 'status_response', status: { ok: true, version: 'standalone' } })
+      return
+    case 'tool_response':
+      handleToolResponse(msg)
+      return
+    case 'notification':
+      return
+    default:
+      log('unexpected native message', msg)
+      return
+  }
+}
+
+/**
+ * @param {Buffer} chunk
+ */
+function onNativeData(chunk) {
+  nativeBuffer = Buffer.concat([nativeBuffer, chunk])
+  while (nativeBuffer.length >= 4) {
+    const length = nativeBuffer.readUInt32LE(0)
+    if (length > MAX_MESSAGE_BYTES) {
+      log('native message length exceeds max', { length, max: MAX_MESSAGE_BYTES })
+      nativeBuffer = Buffer.alloc(0)
+      return
+    }
+    if (nativeBuffer.length < 4 + length) return
+    const payload = nativeBuffer.subarray(4, 4 + length)
+    nativeBuffer = nativeBuffer.subarray(4 + length)
+    try {
+      const msg = JSON.parse(payload.toString('utf8'))
+      handleNativeMessage(msg)
+    } catch (error) {
+      log('invalid native JSON payload', { error: String(error) })
+    }
+  }
+}
+
+/**
+ * @returns {Array<{name: string, description: string, inputSchema: Record<string, unknown>}>}
+ */
+function loadToolSchemas() {
+  if (!TOOL_SCHEMAS_PATH) {
+    throw new Error('Missing CODEX_TOOL_SCHEMAS_PATH env var')
+  }
+  const raw = fs.readFileSync(TOOL_SCHEMAS_PATH, 'utf8')
+  const parsed = JSON.parse(raw)
+  if (!Array.isArray(parsed)) {
+    throw new Error(`Invalid tool schema file at ${TOOL_SCHEMAS_PATH}: expected array`)
+  }
+  return parsed
+}
+
+function extractImageContent(payload) {
+  if (!payload || typeof payload !== 'object' || Array.isArray(payload)) return null
+  const base64Image = typeof payload.base64Image === 'string' ? payload.base64Image : undefined
+  if (!base64Image) return null
+  if (base64Image.startsWith('data:')) {
+    const match = base64Image.match(/^data:(.*?);base64,(.*)$/)
+    if (match) {
+      return { mimeType: match[1] || 'image/png', data: match[2] || '' }
+    }
+  }
+  return { mimeType: 'image/png', data: base64Image }
+}
+
+function formatToolResult(response) {
+  const text = typeof response.content === 'string' ? response.content : JSON.stringify(response.content ?? null)
+  const structuredContent =
+    typeof response.content === 'object' && response.content !== null && !Array.isArray(response.content)
+      ? response.content
+      : undefined
+  const content = [{ type: 'text', text }]
+  const image = extractImageContent(structuredContent)
+  if (image) {
+    content.push({ type: 'image', data: image.data, mimeType: image.mimeType })
+  }
+  return { content, structuredContent, isError: response.isError }
+}
+
+function isLoopback(address) {
+  if (!address) return false
+  return address === '::1' || address === '127.0.0.1' || address.startsWith('::ffff:127.')
+}
+
+function isAllowedOrigin(origin, allowlist) {
+  try {
+    const url = new URL(origin)
+    if (allowlist.length === 0) return isLoopback(url.hostname)
+    return allowlist.includes(origin)
+  } catch {
+    return false
+  }
+}
+
+function matchesBearerToken(value, expected) {
+  const [scheme, token] = value.split(' ')
+  if (!scheme || !token) return false
+  if (scheme.toLowerCase() !== 'bearer') return false
+  return token === expected
+}
+
+function getSessionIdHeader(value) {
+  if (typeof value === 'string' && value.trim()) return value.trim()
+  if (Array.isArray(value)) {
+    for (const item of value) {
+      if (typeof item === 'string' && item.trim()) return item.trim()
+    }
+  }
+  return undefined
+}
+
+async function main() {
+  stdin.on('data', onNativeData)
+  stdin.on('error', (error) => log('stdin error', { error: String(error) }))
+  stdout.on('error', (error) => log('stdout error', { error: String(error) }))
+
+  const transports = new Map()
+
+  function createMcpServer() {
+    const server = new Server(
+      { name: 'codex-extension-standalone-shim', version: '0.1.0' },
+      { capabilities: { tools: { listChanged: true } } },
+    )
+
+    server.setRequestHandler(ListToolsRequestSchema, async () => {
+      const tools = loadToolSchemas().map((tool) => ({
+        name: tool.name,
+        description: tool.description,
+        inputSchema: tool.inputSchema,
+      }))
+      return { tools }
+    })
+
+    server.setRequestHandler(CallToolRequestSchema, async (request, extra) => {
+      const toolName = request.params.name
+      const args = request.params.arguments ?? {}
+      const clientId = extra.sessionId ?? CODEX_CLIENT_ID ?? 'codex-mcp'
+      try {
+        const response = await sendToolRequest(toolName, /** @type {Json} */ (args), clientId)
+        return formatToolResult(response)
+      } catch (error) {
+        return formatToolResult({ content: { error: String(error) }, isError: true })
+      }
+    })
+
+    return server
+  }
+
+  /** @returns {Promise<StreamableHTTPServerTransport>} */
+  async function createSessionTransport() {
+    const mcpServer = createMcpServer()
+    let transport
+    transport = new StreamableHTTPServerTransport({
+      sessionIdGenerator: () => randomUUID(),
+      onsessioninitialized: (sessionId) => {
+        transports.set(sessionId, transport)
+      },
+    })
+    transport.onclose = () => {
+      const sid = transport.sessionId
+      if (sid) transports.delete(sid)
+    }
+    await mcpServer.connect(transport)
+    return transport
+  }
+
+  const httpServer = createServer(async (req, res) => {
+    const requestUrl = new URL(req.url ?? '/', `http://${MCP_HOST}`)
+    if (requestUrl.pathname !== '/mcp') {
+      res.statusCode = 404
+      res.end('Not Found')
+      return
+    }
+    if (!isLoopback(req.socket.remoteAddress)) {
+      res.statusCode = 403
+      res.end('Forbidden')
+      return
+    }
+    const origin = req.headers.origin
+    if (origin && !isAllowedOrigin(origin, MCP_ALLOWED_ORIGINS)) {
+      res.statusCode = 403
+      res.end('Forbidden')
+      return
+    }
+    if (MCP_AUTH_TOKEN) {
+      const auth = req.headers.authorization ?? ''
+      if (!matchesBearerToken(auth, MCP_AUTH_TOKEN)) {
+        res.statusCode = 401
+        res.end('Unauthorized')
+        return
+      }
+    }
+
+    const method = req.method ?? 'GET'
+    const sessionId = getSessionIdHeader(req.headers['mcp-session-id'])
+
+    if (method === 'POST') {
+      if (sessionId) {
+        const existing = transports.get(sessionId)
+        if (!existing) {
+          res.statusCode = 404
+          res.end('Not Found')
+          return
+        }
+        await existing.handleRequest(req, res)
+        return
+      }
+      const transport = await createSessionTransport()
+      await transport.handleRequest(req, res)
+      if (!transport.sessionId) {
+        await transport.close().catch(() => {})
+      }
+      return
+    }
+
+    if (method === 'GET' || method === 'DELETE') {
+      if (!sessionId) {
+        res.statusCode = 400
+        res.end('Bad Request')
+        return
+      }
+      const existing = transports.get(sessionId)
+      if (!existing) {
+        res.statusCode = 404
+        res.end('Not Found')
+        return
+      }
+      await existing.handleRequest(req, res)
+      return
+    }
+
+    res.statusCode = 405
+    res.end('Method Not Allowed')
+  })
+
+  await new Promise((resolve) => {
+    httpServer.listen(MCP_PORT, MCP_HOST, resolve)
+  })
+  log('shim started', { host: MCP_HOST, port: MCP_PORT, schemas: TOOL_SCHEMAS_PATH })
+}
+
+main().catch((error) => {
+  log('fatal error', { error: String(error) })
+  process.exit(1)
+})