Add AGENTS.md knowledge base documentation files

- Add src/agents/AGENTS.md with agent module documentation
- Update root AGENTS.md with latest generation timestamp (2025-12-28T17:15:00+09:00, commit f5b74d5)
- Update src/features/AGENTS.md with builtin-commands and claude-code-plugin-loader documentation
- Update src/hooks/AGENTS.md with thinking-block-validator hook documentation

🤖 Generated with assistance of [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

AGENTS.md

@@ -1,7 +1,7 @@
 # PROJECT KNOWLEDGE BASE
 
-**Generated:** 2025-12-24T17:07:00+09:00
+**Generated:** 2025-12-28T17:15:00+09:00
-**Commit:** 0172241
+**Commit:** f5b74d5
 **Branch:** dev
 
 ## OVERVIEW

src/agents/AGENTS.md

@@ -0,0 +1,89 @@
+# AGENTS KNOWLEDGE BASE
+
+## OVERVIEW
+
+AI agent definitions for multi-model orchestration. 7 specialized agents: Sisyphus (orchestrator), oracle (strategy), librarian (research), explore (grep), frontend-ui-ux-engineer, document-writer, multimodal-looker.
+
+## STRUCTURE
+
+```
+agents/
+├── sisyphus.ts              # Primary orchestrator (Claude Opus 4.5)
+├── oracle.ts                # Strategic advisor (GPT-5.2)
+├── librarian.ts             # Multi-repo research (Claude Sonnet 4.5)
+├── explore.ts               # Fast codebase grep (Grok Code)
+├── frontend-ui-ux-engineer.ts  # UI generation (Gemini 3 Pro)
+├── document-writer.ts       # Technical docs (Gemini 3 Flash)
+├── multimodal-looker.ts     # PDF/image analysis (Gemini 3 Flash)
+├── build-prompt.ts          # Shared build agent prompt
+├── plan-prompt.ts           # Shared plan agent prompt
+├── types.ts                 # AgentModelConfig interface
+├── utils.ts                 # createBuiltinAgents(), getAgentName()
+└── index.ts                 # builtinAgents export
+```
+
+## AGENT MODELS
+
+| Agent | Default Model | Fallback | Purpose |
+|-------|---------------|----------|---------|
+| Sisyphus | anthropic/claude-opus-4-5 | - | Primary orchestrator with extended thinking |
+| oracle | openai/gpt-5.2 | - | Architecture, debugging, code review |
+| librarian | anthropic/claude-sonnet-4-5 | google/gemini-3-flash | Docs, OSS research, GitHub examples |
+| explore | opencode/grok-code | google/gemini-3-flash, anthropic/claude-haiku-4-5 | Fast contextual grep |
+| frontend-ui-ux-engineer | google/gemini-3-pro-preview | - | UI/UX code generation |
+| document-writer | google/gemini-3-pro-preview | - | Technical writing |
+| multimodal-looker | google/gemini-3-flash | - | PDF/image analysis |
+
+## HOW TO ADD AN AGENT
+
+1. Create `src/agents/my-agent.ts`:
+   ```typescript
+   import type { AgentConfig } from "@opencode-ai/sdk"
+   
+   export const myAgent: AgentConfig = {
+     model: "provider/model-name",
+     temperature: 0.1,
+     system: "Agent system prompt...",
+     tools: { include: ["tool1", "tool2"] },  // or exclude: [...]
+   }
+   ```
+2. Add to `builtinAgents` in `src/agents/index.ts`
+3. Update `types.ts` if adding new config options
+
+## AGENT CONFIG OPTIONS
+
+| Option | Type | Description |
+|--------|------|-------------|
+| model | string | Model identifier (provider/model-name) |
+| temperature | number | 0.0-1.0, most use 0.1 for consistency |
+| system | string | System prompt (can be multiline template literal) |
+| tools | object | `{ include: [...] }` or `{ exclude: [...] }` |
+| top_p | number | Optional nucleus sampling |
+| maxTokens | number | Optional max output tokens |
+
+## MODEL FALLBACK LOGIC
+
+`createBuiltinAgents()` in utils.ts handles model fallback:
+
+1. Check user config override (`agents.{name}.model`)
+2. Check installer settings (claude max20, gemini antigravity)
+3. Use default model
+
+**Fallback order for explore**:
+- If gemini antigravity enabled → `google/gemini-3-flash`
+- If claude max20 enabled → `anthropic/claude-haiku-4-5`
+- Default → `opencode/grok-code` (free)
+
+## ANTI-PATTERNS (AGENTS)
+
+- **High temperature**: Don't use >0.3 for code-related agents
+- **Broad tool access**: Prefer explicit `include` over unrestricted access
+- **Monolithic prompts**: Keep prompts focused; delegate to specialized agents
+- **Missing fallbacks**: Consider free/cheap fallbacks for rate-limited models
+
+## SHARED PROMPTS
+
+- **build-prompt.ts**: Base prompt for build agents (OpenCode default + Sisyphus variants)
+- **plan-prompt.ts**: Base prompt for plan agents (Planner-Sisyphus)
+
+Used by `src/index.ts` when creating Builder-Sisyphus and Planner-Sisyphus variants.

src/features/AGENTS.md

@@ -12,10 +12,12 @@ features/
 │   ├── manager.ts              # Task lifecycle, notifications
 │   ├── manager.test.ts
 │   └── types.ts
+├── builtin-commands/           # Built-in slash command definitions
 ├── claude-code-agent-loader/   # Load agents from ~/.claude/agents/*.md
 ├── claude-code-command-loader/ # Load commands from ~/.claude/commands/*.md
 ├── claude-code-mcp-loader/     # Load MCPs from .mcp.json
 │   └── env-expander.ts         # ${VAR} expansion
+├── claude-code-plugin-loader/  # Load external plugins from installed_plugins.json
 ├── claude-code-session-state/  # Session state persistence
 ├── claude-code-skill-loader/   # Load skills from ~/.claude/skills/*/SKILL.md
 └── hook-message-injector/      # Inject messages into conversation

src/hooks/AGENTS.md

@@ -27,6 +27,7 @@ hooks/
 ├── rules-injector/             # Conditional rules from .claude/rules/
 ├── session-recovery/           # Recover from session errors
 ├── think-mode/                 # Auto-detect thinking triggers
+├── thinking-block-validator/   # Validate thinking blocks in messages
 ├── context-window-monitor.ts   # Monitor context usage (standalone)
 ├── empty-task-response-detector.ts
 ├── session-notification.ts     # OS notify on idle (standalone)