ArchLang

What it does

ArchLang is a declarative language designed to treat architecture documentation as code. It allows developers to define services, events, and collaborations in .arch files, which are then compiled into a deterministic knowledge graph. This eliminates the problem of outdated wikis and tribal knowledge by providing a single, validated source of truth that can be queried via REST and MCP servers.

Tools

• list_components: List all components with kind, org, and visibility.
• get_component: Get a component's full details including upstream and downstream collaborations.
• list_features: List all declared business features.
• trace_feature: Trace a feature across every service, event, flow, and step.
• list_flows: List all declared flows.
• trace_flow: Trace a flow step by step across services.
• analyze_impact: Analyze what would break if a component changes.

Installation

To use ArchLang as an MCP server, first build the binary:

go build -o archlang-mcp ./cmd/mcp

Then add it to your claude_desktop_config.json:

{
  "mcpServers": {
    "archlang": {
      "command": "/absolute/path/to/archlang-mcp"
    }
  }
}

Supported hosts

• Claude Desktop
• Claude Code