diff --git a/ansible/inventory/group_vars/desktop.yml b/ansible/inventory/group_vars/desktop.yml
index cd6736b..2c82eff 100644
--- a/ansible/inventory/group_vars/desktop.yml
+++ b/ansible/inventory/group_vars/desktop.yml
@@ -153,6 +153,10 @@ desktop_common_dotfiles:
     src: .config/yt-dlp/
     dest: .config/yt-dlp/
     mode: preserve
+  - name: OpenCode config
+    src: .config/opencode/
+    dest: .config/opencode/
+    mode: preserve
   - name: .gitignore_global
     src: .gitignore_global
     dest: .gitignore_global
diff --git a/dotfiles/desktop/.config/opencode/AGENTS.md b/dotfiles/desktop/.config/opencode/AGENTS.md
new file mode 100644
index 0000000..2e4a749
--- /dev/null
+++ b/dotfiles/desktop/.config/opencode/AGENTS.md
@@ -0,0 +1,7 @@
+# AGENTS.md — Global Context
+
+Rules:
+- minimal, targeted edits
+- preserve layering
+- avoid duplication
+- validate before applying changes
diff --git a/dotfiles/desktop/.config/opencode/bootstrap.md b/dotfiles/desktop/.config/opencode/bootstrap.md
new file mode 100644
index 0000000..d92fc25
--- /dev/null
+++ b/dotfiles/desktop/.config/opencode/bootstrap.md
@@ -0,0 +1,30 @@
+# bootstrap.md — Global Operating Context for opencode
+
+This file defines the persistent mental model for the agent.
+
+## Core Principles
+- UNIX philosophy (simple, composable tools)
+- Minimalism (only what is necessary)
+- Reproducibility (everything rebuildable)
+- Control over convenience (explicit > magic)
+
+Golden rule:
+If it cannot be rebuilt, it is not owned.
+
+## System Model
+core system → user environment
+
+## Infrastructure Model
+common → OS → profile → host
+
+## Hosts
+- ikaros (Void desktop)
+- nymph (Void laptop)
+- deadalus (workstation)
+- prometheus (server)
+
+## Agent Behavior
+- make minimal changes
+- avoid refactors
+- preserve architecture
+- never break existing systems
diff --git a/dotfiles/desktop/.config/opencode/infra.md b/dotfiles/desktop/.config/opencode/infra.md
new file mode 100644
index 0000000..1f7b989
--- /dev/null
+++ b/dotfiles/desktop/.config/opencode/infra.md
@@ -0,0 +1,9 @@
+# infra.md
+
+Layering:
+common → OS → profile → host
+
+Rules:
+- no host logic in shared layers
+- reuse over duplication
+- incremental evolution
diff --git a/dotfiles/desktop/.config/opencode/opencode.json b/dotfiles/desktop/.config/opencode/opencode.json
new file mode 100644
index 0000000..80beaf9
--- /dev/null
+++ b/dotfiles/desktop/.config/opencode/opencode.json
@@ -0,0 +1,9 @@
+{
+  "$schema": "https://opencode.ai/config.json",
+  "instructions": [
+    "~/.config/opencode/bootstrap.md",
+    "~/.config/opencode/infra.md",
+    "~/.config/opencode/philosophy.md",
+    "~/.config/opencode/workflow.md"
+  ]
+}
diff --git a/dotfiles/desktop/.config/opencode/philosophy.md b/dotfiles/desktop/.config/opencode/philosophy.md
new file mode 100644
index 0000000..c0b7e0f
--- /dev/null
+++ b/dotfiles/desktop/.config/opencode/philosophy.md
@@ -0,0 +1,6 @@
+# philosophy.md
+
+- UNIX first
+- simple > complex
+- explicit > implicit
+- control > convenience
diff --git a/dotfiles/desktop/.config/opencode/workflow.md b/dotfiles/desktop/.config/opencode/workflow.md
new file mode 100644
index 0000000..d219de5
--- /dev/null
+++ b/dotfiles/desktop/.config/opencode/workflow.md
@@ -0,0 +1,6 @@
+# workflow.md
+
+- small changes
+- test on one host
+- use dry-run (--check --diff)
+- keep idempotency