diff --git a/src/agents/AGENTS.md b/src/agents/AGENTS.md
index 60cddc5f..2713507a 100644
--- a/src/agents/AGENTS.md
+++ b/src/agents/AGENTS.md
@@ -2,20 +2,19 @@
 
 ## OVERVIEW
 
-7 AI agents for multi-model orchestration. Sisyphus orchestrates, specialists handle domains.
+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 (504 lines)
-├── oracle.ts                # Strategic advisor
-├── librarian.ts             # Multi-repo research
-├── explore.ts               # Fast codebase grep
-├── frontend-ui-ux-engineer.ts  # UI generation
-├── document-writer.ts       # Technical docs
-├── multimodal-looker.ts     # PDF/image analysis
-├── sisyphus-prompt-builder.ts  # Sisyphus prompt construction
+├── 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
@@ -25,40 +24,68 @@ agents/
 
 ## AGENT MODELS
 
-| Agent | Model | Fallback | Purpose |
-|-------|-------|----------|---------|
-| Sisyphus | anthropic/claude-opus-4-5 | - | Orchestrator with extended thinking |
-| oracle | openai/gpt-5.2 | - | Architecture, debugging, review |
-| librarian | anthropic/claude-sonnet-4-5 | google/gemini-3-flash | Docs, GitHub research |
-| explore | opencode/grok-code | gemini-3-flash, haiku-4-5 | Contextual grep |
-| frontend-ui-ux-engineer | google/gemini-3-pro-preview | - | Beautiful UI code |
+| 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 | - | Visual analysis |
+| multimodal-looker | google/gemini-3-flash | - | PDF/image analysis |
 
-## HOW TO ADD
+## 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: "...",
-     tools: { include: ["tool1"] },
+     system: "Agent system prompt...",
+     tools: { include: ["tool1", "tool2"] },  // or exclude: [...]
    }
    ```
-2. Add to `builtinAgents` in index.ts
-3. Update types.ts if new config options
+2. Add to `builtinAgents` in `src/agents/index.ts`
+3. Update `types.ts` if adding new config options
 
-## MODEL FALLBACK
+## AGENT CONFIG OPTIONS
 
-`createBuiltinAgents()` handles fallback:
-1. User config override
-2. Installer settings (claude max20, gemini antigravity)
-3. Default model
+| 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 |
 
-## ANTI-PATTERNS
+## MODEL FALLBACK LOGIC
 
-- High temperature (>0.3) for code agents
-- Broad tool access (prefer explicit `include`)
-- Monolithic prompts (delegate to specialists)
-- Missing fallbacks for rate-limited models
+`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 (legacy)
+- **prometheus-prompt.ts**: System prompt for Prometheus (Planner) agent
+- **metis.ts**: Metis (Plan Consultant) agent for pre-planning analysis
+
+Used by `src/index.ts` when creating Builder-Sisyphus and Prometheus (Planner) variants.
diff --git a/src/agents/index.ts b/src/agents/index.ts
index b10ee264..16803440 100644
--- a/src/agents/index.ts
+++ b/src/agents/index.ts
@@ -6,6 +6,9 @@ import { exploreAgent } from "./explore"
 import { frontendUiUxEngineerAgent } from "./frontend-ui-ux-engineer"
 import { documentWriterAgent } from "./document-writer"
 import { multimodalLookerAgent } from "./multimodal-looker"
+import { metisAgent } from "./metis"
+import { orchestratorSisyphusAgent } from "./orchestrator-sisyphus"
+import { momusAgent } from "./momus"
 
 export const builtinAgents: Record<string, AgentConfig> = {
   Sisyphus: sisyphusAgent,
@@ -15,6 +18,9 @@ export const builtinAgents: Record<string, AgentConfig> = {
   "frontend-ui-ux-engineer": frontendUiUxEngineerAgent,
   "document-writer": documentWriterAgent,
   "multimodal-looker": multimodalLookerAgent,
+  "Metis (Plan Consultant)": metisAgent,
+  "Momus (Plan Reviewer)": momusAgent,
+  "orchestrator-sisyphus": orchestratorSisyphusAgent,
 }
 
 export * from "./types"
diff --git a/src/agents/types.ts b/src/agents/types.ts
index dcd08126..8cbe78d9 100644
--- a/src/agents/types.ts
+++ b/src/agents/types.ts
@@ -64,6 +64,9 @@ export type BuiltinAgentName =
   | "frontend-ui-ux-engineer"
   | "document-writer"
   | "multimodal-looker"
+  | "Metis (Plan Consultant)"
+  | "Momus (Plan Reviewer)"
+  | "orchestrator-sisyphus"
 
 export type OverridableAgentName =
   | "build"