# Tools & Guides

> MCP tools for external agents and the guides system for context sharing.

**How it works:** RA-OS exposes tools via MCP that external AI agents can call to read, create, and update your knowledge graph. Guides are markdown documents that help external agents understand your knowledge base.

---

## MCP Tools

RA-OS provides MCP tools for external agents:

### Node Operations

| Tool | Description |
|------|-------------|
| `rah_add_node` | Create a new knowledge node |
| `rah_search_nodes` | Search nodes by title, content, or dimensions |
| `rah_update_node` | Update an existing node |
| `rah_get_nodes` | Get nodes by ID array |

### Edge Operations

| Tool | Description |
|------|-------------|
| `rah_create_edge` | Create relationship between nodes |
| `rah_query_edges` | Query existing edges |
| `rah_update_edge` | Update edge metadata |

### Dimension Operations

| Tool | Description |
|------|-------------|
| `rah_create_dimension` | Create a new dimension tag |
| `rah_update_dimension` | Update dimension description |
| `rah_delete_dimension` | Delete a dimension |

### Search

| Tool | Description |
|------|-------------|
| `rah_search_embeddings` | Semantic search across chunk embeddings |

### Guides

| Tool | Description |
|------|-------------|
| `rah_list_guides` | List all available guides |
| `rah_read_guide` | Read a specific guide's content |
| `rah_write_guide` | Create or update a guide |

---

## Tool Schemas

### rah_add_node

```typescript
{
  title: string,        // Required
  content?: string,
  description?: string,
  dimensions?: string[],
  link?: string,
  metadata?: object
}
```

### rah_search_nodes

```typescript
{
  search?: string,      // Full-text search
  dimensions?: string[],// Filter by dimensions
  limit?: number        // Max results (default: 20)
}
```

### rah_update_node

```typescript
{
  id: number,           // Node ID
  title?: string,
  content?: string,     // Replaces existing content
  description?: string,
  dimensions?: string[],
  link?: string,
  metadata?: object
}
```

### rah_create_edge

```typescript
{
  from_node_id: number,
  to_node_id: number,
  context?: string      // Relationship description
}
```

### rah_search_embeddings

```typescript
{
  query: string,        // Search query
  node_id?: number,     // Scope to specific node
  limit?: number,       // Max results
  threshold?: number    // Similarity threshold (0-1)
}
```

---

## Guides

Guides are markdown documents stored in `src/config/guides/` that help external AI agents understand your knowledge base context, conventions, and usage patterns.

### Why Guides?

When an external agent (like Claude Code) connects to RA-H via MCP, it has access to tools but lacks context about:
- How your knowledge base is organized
- What dimensions mean in your system
- Best practices for creating/linking nodes
- Your specific workflows and conventions

Guides bridge this gap by providing structured documentation that agents can read.

### Managing Guides

**Via UI:**
1. Open Settings (gear icon)
2. Click the "Guides" tab
3. Create, edit, or delete guides

**Via Pane:**
- Click the Guides icon in the left toolbar
- Browse and read guides directly

### Built-in Guides

| Guide | Purpose |
|-------|---------|
| `connect` | How to find and create connections between nodes |
| `integrate` | Deep analysis and integration patterns |
| `prep` | Preparing content for the knowledge base |
| `research` | Research workflow patterns |
| `survey` | Survey and discovery patterns |

### Creating Custom Guides

Guides use markdown with optional YAML frontmatter:

```markdown
---
description: Brief description shown in guide list
---

# Guide Title

Your guide content here...
```

---

## API Routes

RA-OS exposes REST APIs that MCP tools call internally:

| Route | Method | Purpose |
|-------|--------|---------|
| `/api/nodes` | GET/POST | List/create nodes |
| `/api/nodes/[id]` | GET/PUT/DELETE | Node CRUD |
| `/api/nodes/search` | POST | Search nodes |
| `/api/edges` | GET/POST | List/create edges |
| `/api/edges/[id]` | GET/PUT/DELETE | Edge CRUD |
| `/api/dimensions` | GET/POST | List/create dimensions |
| `/api/dimensions/search` | GET | Search dimensions |
| `/api/guides` | GET | List guides |
| `/api/guides/[name]` | GET/PUT/DELETE | Guide CRUD |

---

## Database Tools (Internal)

These tools are used by APIs and internal operations:

| Tool | File | Purpose |
|------|------|---------|
| `queryNodes` | `src/tools/database/queryNodes.ts` | Search nodes |
| `createNode` | `src/tools/database/createNode.ts` | Create node |
| `updateNode` | `src/tools/database/updateNode.ts` | Update node |
| `deleteNode` | `src/tools/database/deleteNode.ts` | Delete node |
| `getNodesById` | `src/tools/database/getNodesById.ts` | Get by ID |
| `createEdge` | `src/tools/database/createEdge.ts` | Create edge |
| `updateEdge` | `src/tools/database/updateEdge.ts` | Update edge |
| `queryEdge` | `src/tools/database/queryEdge.ts` | Query edges |
| `queryDimensions` | `src/tools/database/queryDimensions.ts` | Query dimensions |
| `searchContentEmbeddings` | `src/tools/other/searchContentEmbeddings.ts` | Semantic search |

---

## Key Files

| File | Purpose |
|------|---------|
| `apps/mcp-server/server.js` | HTTP MCP server |
| `apps/mcp-server/stdio-server.js` | STDIO MCP server |
| `src/tools/infrastructure/registry.ts` | Tool registry |
| `src/services/guides/guideService.ts` | Guide management |
| `src/config/guides/*.md` | Built-in guides |