Content
# Context Mapper MCP Server
[](https://www.npmjs.com/package/context-mapper-mcp)
[](https://opensource.org/licenses/MIT)
An MCP (Model Context Protocol) server that enables AI assistants to work with Domain-Driven Design models using Context Mapper's CML (Context Mapping Language).
## Features
- **Parse and serialize CML files** - Full support for Context Mapper's CML syntax
- **Manage bounded contexts** - Create, update, delete bounded contexts
- **Work with aggregates** - Define entities, value objects, domain events, commands, and services
- **Context map relationships** - Define and manage relationships between bounded contexts (Partnership, SharedKernel, Upstream-Downstream with patterns like OHS, PL, ACL, CF)
- **Generate PlantUML diagrams** - Visualize context maps and aggregate structures
- **Real-time validation** - Catch errors at creation time, not at save time
- **ID Value Objects** - Dedicated tool for creating DDD-compliant identifier types
## Validation Features
The server validates models in real-time to prevent common CML errors:
| Validation | When | Example Error |
|------------|------|---------------|
| Duplicate names | On create | `'AgentId' already exists in ContextA...` |
| Invalid types | On create | `Map<K,V> is not supported in CML...` |
| Reserved names | On create | `'Resource' is a reserved keyword...` |
| Reserved attributes | On save | Auto-escaped with `^` prefix |
### Valid Attribute Types
- **Primitives**: `String`, `int`, `long`, `boolean`, `DateTime`, `BigDecimal`, `UUID`
- **Collections**: `List<Type>`, `Set<Type>`
- **References**: `- TypeName` (reference to domain objects)
### Invalid Types (Rejected)
- `Map<K,V>`, `Any`, `Tuple`, `Runnable`, `Callbacks`, nested generics
## Installation
### Claude Code
```bash
claude mcp add context-mapper -- npx -y context-mapper-mcp@latest
```
### Claude Desktop
Add to your Claude Desktop configuration (`claude_desktop_config.json`):
```json
{
"mcpServers": {
"context-mapper": {
"command": "npx",
"args": ["-y", "context-mapper-mcp@latest"]
}
}
}
```
### Available Tools
#### Model Management
| Tool | Description |
|------|-------------|
| `cml_create_model` | Create a new empty CML model |
| `cml_load_model` | Load a CML file |
| `cml_save_model` | Save model to disk |
| `cml_validate_model` | Validate CML syntax and semantics |
| `cml_get_model_info` | Get model statistics |
#### Query Tools
| Tool | Description |
|------|-------------|
| `cml_list_bounded_contexts` | List all bounded contexts |
| `cml_get_bounded_context` | Get context details |
| `cml_list_aggregates` | List aggregates (optionally filtered by context) |
| `cml_get_aggregate` | Get aggregate with all its elements |
| `cml_find_elements` | Search by name pattern (regex) |
| `cml_list_relationships` | List context map relationships |
#### Context Tools
| Tool | Description |
|------|-------------|
| `cml_create_context_map` | Create a context map |
| `cml_create_bounded_context` | Create a bounded context |
| `cml_update_bounded_context` | Update a bounded context |
| `cml_delete_bounded_context` | Delete a bounded context |
#### Aggregate Tools
| Tool | Description |
|------|-------------|
| `cml_create_aggregate` | Create an aggregate |
| `cml_update_aggregate` | Update an aggregate |
| `cml_delete_aggregate` | Delete an aggregate |
| `cml_add_entity` | Add entity to aggregate |
| `cml_add_value_object` | Add value object |
| `cml_add_identifier` | Add ID value object (DDD best practice) |
| `cml_add_domain_event` | Add domain event |
| `cml_add_command` | Add command |
| `cml_add_service` | Add domain service |
| `cml_batch_add_elements` | **Batch create** multiple domain objects in one call |
| `cml_delete_entity` | Delete entity |
| `cml_delete_value_object` | Delete value object |
| `cml_delete_domain_event` | Delete domain event |
| `cml_delete_command` | Delete command |
| `cml_delete_service` | Delete service |
##### Batch Creation (`cml_batch_add_elements`)
Create multiple domain objects in a single call for improved efficiency:
```json
{
"contextName": "CustomerManagement",
"aggregateName": "Customer",
"identifiers": [
{ "name": "CustomerId" }
],
"entities": [
{
"name": "Customer",
"aggregateRoot": true,
"attributes": [
{ "name": "id", "type": "- CustomerId", "key": true },
{ "name": "email", "type": "String" }
]
}
],
"valueObjects": [
{
"name": "Address",
"attributes": [
{ "name": "street", "type": "String" },
{ "name": "city", "type": "String" }
]
}
],
"domainEvents": [
{ "name": "CustomerRegistered", "attributes": [{ "name": "customerId", "type": "- CustomerId" }] }
],
"commands": [
{ "name": "RegisterCustomer", "attributes": [{ "name": "email", "type": "String" }] }
]
}
```
**Benefits:**
- **Faster**: Single round-trip instead of 8+ individual calls
- **Atomic validation**: All elements validated before any are created
- **Error handling**: Use `failFast: false` to collect all errors at once
#### Relationship Tools
| Tool | Description |
|------|-------------|
| `cml_create_relationship` | Create context map relationship |
| `cml_update_relationship` | Update relationship |
| `cml_delete_relationship` | Delete relationship |
| `cml_get_relationship` | Get relationship details |
Supported relationship types:
- **Partnership** - Symmetric, both contexts cooperate
- **SharedKernel** - Symmetric, shared code/models
- **UpstreamDownstream** - Asymmetric with patterns:
- Upstream: OHS (Open Host Service), PL (Published Language)
- Downstream: ACL (Anticorruption Layer), CF (Conformist)
#### Generation Tools
| Tool | Description |
|------|-------------|
| `cml_generate_context_map_diagram` | Generate PlantUML context map |
| `cml_generate_aggregate_diagram` | Generate aggregate class diagram |
| `cml_generate_full_diagram` | Generate full model diagram |
## Example CML File
```cml
ContextMap ECommerceContextMap {
type = AS_IS
contains CustomerManagement, OrderManagement, Inventory
CustomerManagement [U,OHS,PL] -> [D,ACL] OrderManagement
OrderManagement [U] -> [D,CF] Inventory
}
BoundedContext CustomerManagement {
domainVisionStatement = "Manages customer data"
implementationTechnology = "TypeScript"
Aggregate Customer {
Entity Customer {
aggregateRoot
key String customerId
String email
String firstName
}
ValueObject Address {
String street
String city
}
DomainEvent CustomerRegistered {
String customerId
Date registeredAt
}
Command RegisterCustomer {
String email
String firstName
}
}
}
```
## Development
```bash
git clone https://github.com/thijs-hakkenberg/contextmapper_mcp.git
cd contextmapper_mcp
npm install
npm run build
npm test
```
## Architecture
- **Parser**: Chevrotain-based lexer and parser for CML syntax
- **Writer**: Serializes model back to CML format
- **Validation**: Checks model consistency and semantic rules
- **Tools**: MCP tool implementations for all operations
- **Generators**: PlantUML diagram generators
## License
MIT
