feat(agents): add OmO and OmO-Plan as primary agents, demote build/plan

- OmO: Primary orchestrator (Claude Opus 4.5)
- OmO-Plan: Inherits ALL settings from OpenCode's plan agent at runtime
  - description appended with '(OhMyOpenCode version)'
  - Configurable via oh-my-opencode.json agents.OmO-Plan
- build/plan: Demoted to subagent when OmO enabled
- Add plan and OmO-Plan to OverridableAgentNameSchema

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

Author: code-yeongyu

README.ko.md

@@ -561,9 +561,14 @@ Google Gemini 모델을 위한 내장 Antigravity OAuth를 활성화합니다:
 
 ### OmO Agent
 
-OmO는 기본적으로 활성화되며, 기본 primary 에이전트가 됩니다. 내장 "build" 에이전트를 대체하면서 `builtIn` 플래그를 유지하여, OmO가 에이전트 목록에서 첫 번째로 표시됩니다.
+활성화 시(기본값), OmO는 두 개의 primary 에이전트를 추가하고 내장 에이전트를 subagent로 강등합니다:
 
-OmO를 비활성화하고 원래 build 에이전트를 복원하려면:
+- **OmO**: Primary 오케스트레이터 에이전트 (Claude Opus 4.5)
+- **OmO-Plan**: OpenCode plan 에이전트의 모든 설정을 런타임에 상속 (description에 "OhMyOpenCode version" 추가)
+- **build**: subagent로 강등
+- **plan**: subagent로 강등
+
+OmO를 비활성화하고 원래 build/plan 에이전트를 복원하려면:
 
 ```json
 {
@@ -573,9 +578,25 @@ OmO를 비활성화하고 원래 build 에이전트를 복원하려면:
 }
 ```
 
+다른 에이전트처럼 OmO와 OmO-Plan도 커스터마이징할 수 있습니다:
+
+```json
+{
+  "agents": {
+    "OmO": {
+      "model": "anthropic/claude-sonnet-4",
+      "temperature": 0.3
+    },
+    "OmO-Plan": {
+      "model": "openai/gpt-5.2"
+    }
+  }
+}
+```
+
 | 옵션 | 기본값 | 설명 |
 |------|--------|------|
-| `disabled` | `false` | `true`면 OmO를 비활성화하고 원래 build 에이전트를 복원합니다. `false`(기본값)면 OmO가 build 에이전트를 대체하여 기본 primary 에이전트가 됩니다. |
+| `disabled` | `false` | `true`면 OmO 에이전트를 비활성화하고 원래 build/plan을 primary로 복원합니다. `false`(기본값)면 OmO와 OmO-Plan이 primary 에이전트가 됩니다. |
 
 ### Hooks
 

README.md

@@ -562,9 +562,14 @@ Available agents: `oracle`, `librarian`, `explore`, `frontend-ui-ux-engineer`, `
 
 ### OmO Agent
 
-OmO is enabled by default and becomes the default primary agent. It replaces the built-in "build" agent while keeping the `builtIn` flag, ensuring OmO appears first in the agent list.
+When enabled (default), OmO adds two primary agents and demotes the built-in agents to subagents:
 
-To disable OmO and restore the original build agent:
+- **OmO**: Primary orchestrator agent (Claude Opus 4.5)
+- **OmO-Plan**: Inherits all settings from OpenCode's plan agent at runtime (description appended with "OhMyOpenCode version")
+- **build**: Demoted to subagent
+- **plan**: Demoted to subagent
+
+To disable OmO and restore the original build/plan agents:
 
 ```json
 {
@@ -574,9 +579,25 @@ To disable OmO and restore the original build agent:
 }
 ```
 
+You can also customize OmO and OmO-Plan like other agents:
+
+```json
+{
+  "agents": {
+    "OmO": {
+      "model": "anthropic/claude-sonnet-4",
+      "temperature": 0.3
+    },
+    "OmO-Plan": {
+      "model": "openai/gpt-5.2"
+    }
+  }
+}
+```
+
 | Option | Default | Description |
 |--------|---------|-------------|
-| `disabled` | `false` | When `true`, disables OmO and restores the original build agent. When `false` (default), OmO replaces the build agent as the default primary agent. |
+| `disabled` | `false` | When `true`, disables OmO agents and restores original build/plan as primary. When `false` (default), OmO and OmO-Plan become primary agents. |
 
 ### Hooks
 

src/config/schema.ts

@@ -28,7 +28,9 @@ export const BuiltinAgentNameSchema = z.enum([
 
 export const OverridableAgentNameSchema = z.enum([
   "build",
+  "plan",
   "OmO",
+  "OmO-Plan",
   "oracle",
   "librarian",
   "explore",
@@ -78,7 +80,9 @@ export const AgentOverrideConfigSchema = z.object({
 
 export const AgentOverridesSchema = z.object({
   build: AgentOverrideConfigSchema.optional(),
+  plan: AgentOverrideConfigSchema.optional(),
   OmO: AgentOverrideConfigSchema.optional(),
+  "OmO-Plan": AgentOverrideConfigSchema.optional(),
   oracle: AgentOverrideConfigSchema.optional(),
   librarian: AgentOverrideConfigSchema.optional(),
   explore: AgentOverrideConfigSchema.optional(),

src/hooks/keyword-detector/constants.ts

@@ -28,7 +28,7 @@ TELL THE USER WHAT AGENTS YOU WILL LEVERAGE NOW TO SATISFY USER'S REQUEST.
 ## WORKFLOW
 1. Analyze the request and identify required capabilities
 2. Spawn exploration/librarian agents via background_task in PARALLEL (10+ if needed)
-3. Use planning agents to create detailed work breakdown
+3. Always Use Plan agent with gathered context to create detailed work breakdown
 4. Execute with continuous verification against original requirements
 
 </ultrawork-mode>

src/index.ts

@@ -283,19 +283,28 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
 
       if (isOmoEnabled && builtinAgents.OmO) {
         // TODO: When OpenCode releases `default_agent` config option (PR #5313),
-        // remove this hack and use `config.default_agent = "OmO"` instead.
-        // This hack works by:
-        // 1. Setting build agent's display name to "OmO" (builtIn: true, appears first in TUI)
-        // 2. Adding OmO as a subagent (actual execution target when "OmO" is selected)
+        // use `config.default_agent = "OmO"` instead of demoting build/plan.
         // Tracking: https://github.com/sst/opencode/pull/5313
-        const { OmO: omoConfig, ...restAgents } = builtinAgents;
+        const { name: _planName, ...planConfigWithoutName } = config.agent?.plan ?? {};
+        const omoPlanOverride = pluginConfig.agents?.["OmO-Plan"];
+        const omoPlanBase = {
+          ...builtinAgents.OmO,
+          ...planConfigWithoutName,
+          description: `${config.agent?.plan?.description ?? "Plan agent"} (OhMyOpenCode version)`,
+          color: config.agent?.plan?.color ?? "#6495ED",
+        };
+
+        const omoPlanConfig = omoPlanOverride ? deepMerge(omoPlanBase, omoPlanOverride) : omoPlanBase;
+
         config.agent = {
-          ...restAgents,
+          OmO: builtinAgents.OmO,
+          "OmO-Plan": omoPlanConfig,
+          ...Object.fromEntries(Object.entries(builtinAgents).filter(([k]) => k !== "OmO")),
           ...userAgents,
           ...projectAgents,
           ...config.agent,
-          build: { ...omoConfig, name: "OmO" },
-          OmO: { ...omoConfig, mode: "subagent" },
+          build: { ...config.agent?.build, mode: "subagent" },
+          plan: { ...config.agent?.plan, mode: "subagent" },
         };
       } else {
         config.agent = {