diff --git a/action.yml b/action.yml
index cbc3f6b..9c55d7e 100644
--- a/action.yml
+++ b/action.yml
@@ -49,5 +49,44 @@ inputs:
     default: "https://chat.nomyo.ai/api"
 
 runs:
-  using: "node20"
-  main: "dist/index.mjs"
+  using: "composite"
+  steps:
+    - name: Install Bun
+      shell: bash
+      run: |
+        if ! command -v bun >/dev/null 2>&1; then
+          curl -fsSL https://bun.sh/install | bash
+        fi
+        echo "$HOME/.bun/bin" >> "$GITHUB_PATH"
+
+    - name: Install opencode
+      shell: bash
+      run: |
+        if ! command -v opencode >/dev/null 2>&1; then
+          curl -fsSL https://opencode.ai/install | bash
+        fi
+        echo "$HOME/.opencode/bin" >> "$GITHUB_PATH"
+
+    - name: Install action dependencies
+      shell: bash
+      working-directory: ${{ github.action_path }}
+      run: |
+        export PATH="$HOME/.bun/bin:$PATH"
+        bun install --frozen-lockfile
+
+    - name: Run opencode
+      shell: bash
+      env:
+        NOMYO_API_KEY: ${{ inputs.nomyo_api_key }}
+        NOMYO_API_URL: ${{ inputs.nomyo_api_url }}
+        MODEL: ${{ inputs.model }}
+        AGENT: ${{ inputs.agent }}
+        SHARE: ${{ inputs.share }}
+        PROMPT: ${{ inputs.prompt }}
+        FORGEJO_API_URL: ${{ inputs.forgejo_api_url }}
+        FORGEJO_TOKEN: ${{ inputs.forgejo_token }}
+        MENTIONS: ${{ inputs.mentions }}
+        VARIANT: ${{ inputs.variant }}
+      run: |
+        export PATH="$HOME/.bun/bin:$HOME/.opencode/bin:$PATH"
+        bun run "${{ github.action_path }}/index.ts"