diff --git a/.gitea/workflows/codex.yml b/.gitea/workflows/codex.yml
new file mode 100644
index 0000000..b331591
--- /dev/null
+++ b/.gitea/workflows/codex.yml
@@ -0,0 +1,27 @@
+name: Codex Reply
+
+on:
+  issue_comment:
+    types: [created]
+
+jobs:
+  codex:
+    runs-on: linux_amd64
+    if: |
+      contains(github.event.comment.body, '@codex') &&
+      github.event.comment.user.login != 'anuti'
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./install-opencode
+
+      - uses: ./codex-reply
+        with:
+          issue-number: ${{ github.event.issue.number }}
+          repository: ${{ github.repository }}
+          comment-body: ${{ github.event.comment.body }}
+          comment-author: ${{ github.event.comment.user.login }}
+          issue-title: ${{ github.event.issue.title }}
+          issue-body: ${{ github.event.issue.body }}
+          api-token: ${{ secrets.TOKEN }}
+          api-key: ${{ secrets.OPENCODE_API_KEY }}
diff --git a/codex-reply/action.yml b/codex-reply/action.yml
new file mode 100644
index 0000000..90b63d7
--- /dev/null
+++ b/codex-reply/action.yml
@@ -0,0 +1,136 @@
+name: Codex Reply
+description: "Risponde a un commento @codex analizzando issue, cronologia e codice repository."
+
+inputs:
+  issue-number:
+    description: Numero dell'issue.
+    required: true
+  repository:
+    description: Repository in formato owner/repo.
+    required: true
+  comment-body:
+    description: Testo del commento che contiene @codex.
+    required: true
+  comment-author:
+    description: Login dell'autore del commento.
+    required: true
+  issue-title:
+    description: Titolo dell'issue.
+    required: true
+  issue-body:
+    description: Corpo dell'issue.
+    required: true
+  api-token:
+    description: Token API Gitea.
+    required: true
+  gitea-host:
+    description: URL del server Gitea.
+    required: false
+    default: "https://git.incloud.ovh"
+  api-key:
+    description: API key per opencode.
+    required: true
+  model:
+    description: Modello AI in formato provider/model.
+    required: false
+    default: "deepseek/deepseek-v4-flash"
+
+runs:
+  using: composite
+  steps:
+    - name: Configura autenticazione opencode
+      shell: bash
+      run: |
+        set -euo pipefail
+        if ! command -v jq &> /dev/null; then
+          echo "jq non trovato, tentativo di installazione..."
+          if command -v apt-get &> /dev/null; then
+            apt-get update -qq && apt-get install -y -qq jq 2>&1 || true
+          elif command -v apk &> /dev/null; then
+            apk add --no-cache jq 2>&1 || true
+          fi
+          command -v jq &> /dev/null || { echo "ERRORE: impossibile installare jq."; exit 1; }
+        fi
+        mkdir -p ~/.local/share/opencode
+        jq -n \
+          --arg provider "opencode-go" \
+          --arg key "${{ inputs.api-key }}" \
+          '{($provider): {type: "api", key: $key}}' > ~/.local/share/opencode/auth.json
+        chmod 600 ~/.local/share/opencode/auth.json
+
+    - name: Rispondi a @codex
+      id: codex
+      shell: bash
+      run: |
+        set -euo pipefail
+
+        if ! command -v curl &> /dev/null; then
+          echo "curl non trovato, tentativo di installazione..."
+          if command -v apt-get &> /dev/null; then
+            apt-get update -qq && apt-get install -y -qq curl 2>&1 || true
+          elif command -v apk &> /dev/null; then
+            apk add --no-cache curl 2>&1 || true
+          fi
+          command -v curl &> /dev/null || { echo "ERRORE: impossibile installare curl."; exit 1; }
+        fi
+
+        HOST="${{ inputs.gitea-host }}"
+        TOKEN="${{ inputs.api-token }}"
+        REPO="${{ inputs.repository }}"
+        ISSUE_NUM="${{ inputs.issue-number }}"
+        AUTHOR="${{ inputs.comment-author }}"
+        MODEL_ARG=()
+        [ -n "${{ inputs.model }}" ] && MODEL_ARG=(--model "${{ inputs.model }}")
+
+        # Estrai la domanda dopo @codex
+        QUERY=$(echo "${{ inputs.comment-body }}" | sed -n 's/.*@codex[[:space:],:]*//p')
+        if [ -z "$QUERY" ]; then
+          QUERY="(nessuna domanda specifica dopo @codex)"
+        fi
+
+        # Recupera cronologia commenti, escludendo quelli del bot
+        COMMENTS_JSON=$(curl -sS -f "$HOST/api/v1/repos/$REPO/issues/$ISSUE_NUM/comments" \
+          -H "Authorization: token $TOKEN" \
+          -H "Accept: application/json" 2>/dev/null || echo "[]")
+        COMMENTS_TEXT=$(echo "$COMMENTS_JSON" | jq -r '
+          [.[] | select(.user.login != "anuti")]
+          | sort_by(.created_at)
+          | .[-20:]
+          | .[]
+          | "**\(.user.login)**: \(.body)\n"
+        ' 2>/dev/null || echo "")
+
+        # Costruisci il prompt
+        BODY=$(echo "${{ inputs.issue-body }}" | head -c 10000)
+        [ "${#BODY}" -ge 10000 ] && BODY+=$'\n... (troncato)'
+
+        printf -v PROMPT '%s\n\n%s\n%s\n\n## %s\n%s\n%s\n\n## %s\n%s\n\n## %s - @%s\n%s' \
+          "Sei un assistente esperto per repository software." \
+          "Rispondi alla domanda in modo diretto e tecnico, in italiano." \
+          "Analizza il codice sorgente nel repository quando e' rilevante." \
+          "Issue" \
+          "**Titolo**: ${{ inputs.issue-title }}" \
+          "**Corpo**: $BODY" \
+          "Cronologia commenti" "$COMMENTS_TEXT" \
+          "Domanda" "$AUTHOR" "$QUERY"
+
+        # Esegui opencode
+        OUTFILE="$GITHUB_WORKSPACE/opencode-codex.txt"
+        opencode run "$PROMPT" "${MODEL_ARG[@]}" --dangerously-skip-permissions 2>&1 | tee "$OUTFILE"
+
+        # Pulisci la risposta: togli ANSI codes, banner build, righe vuote iniziali
+        ESC=$(printf '\x1b')
+        sed "s/${ESC}\[[0-9;]*m//g" "$OUTFILE" > /tmp/codex-clean.txt
+        RESPONSE=$(sed '/^> build /d; /^[[:space:]]*$/d' /tmp/codex-clean.txt)
+        if [ -z "$RESPONSE" ]; then
+          RESPONSE="Mi dispiace, non ho generato una risposta. Riprova."
+        fi
+
+        # Pubblica il commento
+        COMMENT_JSON=$(jq -n --arg body "$RESPONSE" '{body: $body}')
+        curl -sS -X POST "$HOST/api/v1/repos/$REPO/issues/$ISSUE_NUM/comments" \
+          -H "Authorization: token $TOKEN" \
+          -H "Content-Type: application/json" \
+          -d "$COMMENT_JSON" 2>/dev/null && \
+          echo "Risposta @codex pubblicata sull'issue #$ISSUE_NUM" || \
+          echo "WARN: Impossibile pubblicare la risposta"