Document and sample Repl.Mcp-built MCP servers for agent IDE install flows

[autocarl]

Summary

Document and demonstrate how to build MCP servers with Repl.Mcp that are easy to configure in major coding-agent hosts.

Important distinction: Repl.Mcp is not itself an MCP server to list everywhere. It is the Repl Toolkit component that helps developers build MCP servers from a Repl command graph. The deliverable should therefore be samples, documentation, and configuration guidance for apps/tools built with Repl.Mcp.

The immediate technical need is a small, verifiable sample app that demonstrates one command graph exposed as CLI, REPL, and MCP, with copy/paste host configs for common agent IDEs.

Why this matters technically

MCP adoption is moving from “a library can expose MCP” to “a concrete tool/server can be installed or configured inside the agent/IDE workflow”. Cursor, VS Code, Claude Code, Cline, OpenAI Apps, and MCP registries now expose explicit install/configuration surfaces.

For Repl, the opportunity is to show developers and agents how to create those installable MCP tools with Repl.Mcp. Registry volume is already high, so a concrete sample built with Repl.Mcp is more useful than trying to list Repl.Mcp as if it were a standalone MCP server.

Technical needs

Add a canonical sample, for example:

samples/cli-repl-mcp-one-graph/

The sample should include:

• A minimal Repl command graph with at least 2-3 typed commands.
• CLI execution example.
• Interactive REPL execution example.
• MCP server execution example for the sample app.
• Structured output example suitable for agents, preferably JSON.
• A short README with exact commands and expected output.
• No secret/API-key requirement for the default path.
• A documented trust/security note for local MCP execution.
• Clear wording that the sample app is the MCP server; Repl.Mcp is the framework/component used to build it.

Add host-specific snippets/docs for a sample app built with Repl.Mcp:

• Cursor: .cursor/mcp.json example using a local command.
• VS Code: .vscode/mcp.json example and optional code --add-mcp command.
• Claude Code: claude mcp add example if the invocation format is stable enough, otherwise a documented config snippet.
• Cline: local MCP setup guidance if supported.
• Generic MCP client JSON using { "command": "...", "args": [...] }.

Optional but valuable:

• A dotnet new template or scripted sample creation path.
• CI smoke test that runs the sample CLI path and validates expected output.
• MCP Inspector workflow once the documented CLI workflow is reliable (Document a reliable MCP Inspector CLI workflow #29 is related).
• A short “how to adapt this sample to your own .NET app” section.

Acceptance criteria

• A user can clone the repo and run the sample CLI command successfully.
• A user can run the sample in REPL mode.
• A user can start the sample app as an MCP server locally.
• README includes copy/paste MCP config for Cursor and VS Code at minimum.
• README includes Claude Code and Cline guidance or explicitly notes if a stable flow is not available yet.
• README explains that Repl.Mcp helps build MCP servers; it is not the MCP server being installed.
• README links to Repl.Mcp docs and explains “one command graph, multiple surfaces”.
• The sample requires no external service by default.
• Security/trust note is included for local MCP servers.

References

• Cursor MCP docs: https://cursor.com/docs/mcp
  • Documents MCP installation, Cursor Marketplace, “Add to Cursor”, .cursor/mcp.json, stdio/SSE/Streamable HTTP, and MCP Apps.
• VS Code MCP docs: https://code.visualstudio.com/docs/agent-customization/mcp-servers
  • Documents MCP server gallery via @mcp, user/workspace install, .vscode/mcp.json, Dev Containers, discovery from other apps, and code --add-mcp.
• Claude Code MCP docs: https://code.claude.com/docs/en/mcp
  • Documents connecting Claude Code to MCP servers, Anthropic Directory, claude mcp add, server trust, and MCP server scaffolding.
• Cline MCP Marketplace: https://cline.bot/mcp-marketplace
• Official MCP Registry: https://github.com/modelcontextprotocol/registry
  • Describes the registry as an app-store-like list of MCP servers.
• OpenAI Apps SDK: https://developers.openai.com/apps-sdk/
  • Positions ChatGPT Apps around building/deploying an MCP server plus app metadata.
• Glama MCP Registry: https://glama.ai/mcp/servers
• MCP.so: https://mcp.so/
• PulseMCP: https://www.pulsemcp.com/

Related trend

This tracks the “MCP install flows / one-click install / marketplace packaging” trend from the agent/devtools trend radar. For Repl, the concrete response is samples, docs, and guidance for building installable MCP servers with Repl.Mcp.