CSO Framework Implementation Example (TypeScript)

This repository details the engineering of a rudimentary Model Context Protocol (MCP) service host and an associated consumer agent, implemented in TypeScript, utilizing the @modelcontextprotocol/sdk.

The structure comprises two main components: 1. cso-greeter-host: An MCP service entity exposing capabilities related to personalized communication, data artifacts, and interaction scaffolding. 2. cso-consumer-utility: A straightforward command-line utility that initiates the host, establishes connectivity, and invokes the host's exposed functionalities programmatically.

Inter-process communication between the consumer and the host in this specific demonstration leverages the Standard Input/Output (stdio) conduit.

Operational Sequence Summary

Development followed these primary stages:

1. Host Engineering: Construction of the MCP service provider.
2. Consumer Engineering: Construction of the script designed to utilize the host's services.
3. Validation & Execution: Deploying the consumer script, which automatically provisions the host and validates data exchange.
4. (Optional) Environmental Integration: Discussion on embedding the host within established MCP consumers, such as VS Code extensions.

Necessary Preconditions

Prior to commencing, confirm the presence of the following environment assets: * Node.js (Version 16 or superior recommended) * npm (Typically bundled with Node.js) * A preferred development environment (e.g., VS Code) * npx (Usually available via npm) - useful for diagnostics via MCP Inspector.

Stage 1: Constructing the MCP Host (cso-greeter-host)

1. Project Foundation Setup:

   • Establish the directory: cso-greeter-host.
   • Initialize the manifest: npm init -y.
   • Install core dependencies: npm install @modelcontextprotocol/sdk zod.
   • Install development dependencies: npm install -D typescript @types/node.
   • Bootstrap TypeScript configuration: npx tsc --init.
   • Refine tsconfig.json (Set module properties like "module": "Node16", "target": "ES2022", compilation output "outDir": "./build", source root "rootDir": "./src", etc.).
   • Modify package.json to specify "type": "module" and define build/start execution scripts.
   • Create the main source file: src/index.ts.

2. Host Logic Definition (src/index.ts):

   • Incorporate necessary libraries (McpServer, StdioServerTransport, z).
   • Declare immutable constants for host name and version.
   • Initialize the McpServer instance, furnishing the identifier, version data, and declaring its functional repertoire (toolkit routines, data points, instructional templates).
   • Defining a Routine (articulate_greeting): Utilize server.tool() to expose a client-invocable operation. Specify a concise summary, define the input schema using Zod (recipient_name, courtesy_level), and implement the execution handler to yield a customized salutation string.
   • Defining a Data Artifact (system_metadata): Use server.resource() to publish immutable data. Assign a distinct Uniform Resource Identifier (meta://host/identity) and implement the retrieval handler to return the host's identifier and version.
   • Defining an Interaction Template (suggest_response_flow): Employ server.prompt() to establish a standardized interaction blueprint. Include a description and implement the handler to return a predefined sequence of conversational turns for LLM guidance.
   • Implementing Transport: Instantiate StdioServerTransport for I/O channeling.
   • Activation: Execute await server.connect(transport) to bring the host online.
   • Diagnostic Output: Integrate console.error messages for operational tracing, crucial when stdio carries protocol traffic on stdout.
   • Process Longevity: Implement measures to prevent immediate termination post-connection establishment.

3. Compilation & Rectification:

   • Execute npm run build to transpile TypeScript into JavaScript within the build directory.
   • Resolve a compilation issue concerning direct server version access by substituting it with the use of designated constant references.

Stage 2: Constructing the MCP Consumer Utility (cso-consumer-utility)

1. Project Foundation Setup:

   • Establish a distinct working directory: cso-consumer-utility.
   • Initialize the manifest: npm init -y.
   • Install core dependencies: npm install @modelcontextprotocol/sdk.
   • Install development dependencies: npm install -D typescript @types/node.
   • Bootstrap and configure tsconfig.json mirroring the host project settings.
   • Modify package.json to include "type": "module" and define build/start scripts.
   • Create the source file: src/client-script.ts.

2. Consumer Logic Definition (src/client-script.ts):

   • Incorporate required modules (Client, StdioClientTransport, path, url).
   • Locate Host Executable: Derive the file path to the host's compiled JavaScript entry point (relative or absolute).
   • Configure Stdio Conduit: Instantiate StdioClientTransport, specifying the execution mechanism (command: node) and the necessary arguments (args: the path to the host script). This step autonomously launches the host process.
   • Instantiate Consumer: Create a Client object, assigning it an identifier and declaring its requirements for host functionalities.
   • Connection Establishment: Invoke await client.connect(transport), which triggers host spawning and secures the MCP session over stdio streams.
   • Service Invocation:
     • Execute the articulate_greeting routine via await client.callTool().
     • Retrieve the system_metadata artifact using await client.readResource().
     • Fetch the suggest-response-flow template using await client.getPrompt().
   • Result Reporting: Utilize console.log to output the data retrieved from the host.
   • Session Termination: Employ await client.close() within a robust cleanup block to guarantee orderly disconnection and host process termination.

Stage 3: Assembly and Operation

1. Dual Project Compilation:

   • cd cso-greeter-host && npm run build
   • cd ../cso-consumer-utility && npm run build

2. Execute Consumer Utility:

   • cd cso-consumer-utility
   • npm run start (or node build/client-script.js)
   • Verify the mixed output stream (consumer logs mixed with host diagnostic errors) confirming successful routine execution and data retrieval.

Functional Role Clarification

• The Host (GreeterHost):

  • Offers Capabilities: Exposes distinct functionalities (greeting utility, metadata repository, interaction model).
  • Awaits Input (via stdio): Maintains readiness for an initiating client connection.
  • Performs Computation: Executes the code bound to a requested routine, artifact, or template.
  • Transmits Outcomes: Formats results according to MCP specifications and transmits them back to the requesting consumer.

• The Consumer (client-script.ts):

  • Leverages Capabilities: Interacts with the services presented by the host.
  • Initiator (via stdio): Launches the host process and establishes the communication link.
  • Dispatches Queries: Determines which routine, artifact, or template is required and sends the corresponding MCP request packet.
  • Interprets Responses: Parses and handles the data returned by the host.
  • Governs Sequence: Manages the chronological order of transactions and signals when the interaction session should terminate.

Ad-hoc Host Verification Using Inspector

To confirm the host operates independently of the consumer script, utilize the MCP Inspector:

bash

Ensure the host process is dormant

Substitute /path/to/... with the absolute location

npx @modelcontextprotocol/inspector node /path/to/cso-greeter-host/build/index.js

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