Develop and debug launchd-managed MCP server processes with atomic edit-kill-verify cycles.
npx skills add https://github.com/thomasttvo/claude-skills --skill mcp-dev
Please help me install this Agent Skill. Skill: mcp-dev Source: https://github.com/thomasttvo/claude-skills/tree/main/skills/mcp-dev Command: npx skills add https://github.com/thomasttvo/claude-skills --skill mcp-dev
Provides practical guidance to reliably develop, restart, and verify long-lived MCP server processes that are managed by launchd, preventing mistakes where edited code is not actually loaded, clients remain connected to dead sockets, or subprocesses silently fail.
Describe the code change, name the MCP service and transport, and ask the assistant to run through the edit→kill→verify steps and specific checks to confirm the new code is live.
High-intent search queries and answers about installing and using this skill.
To verify edited code is loaded, follow an atomic edit→kill→verify cycle: kill the launchd-managed MCP process, restart it, and confirm the new code path via log markers and port or process checks to avoid clients remaining on dead sockets.
Debugging an MCP server using stdio transport requires managing persistent connections. You must kill and restart the process to load code changes, then verify reconnection steps specific to stdio to ensure the persistent transport is correctly re-established.
MCP server verification distinguishes HTTP as stateless, allowing direct endpoint testing, while stdio is persistent and requires specific reconnection steps and subprocess management to confirm the new code is live.
A launchd-managed MCP subprocess might silently fail due to working directory issues or zombie subprocesses. Without an atomic edit→kill→verify cycle, launchd quirks can prevent new code from loading correctly or cause silent failures.
You can validate MCP server changes in a CI pipeline using this approach. It applies to CI-related validation by enforcing atomic edit→kill→verify cycles, transport-specific testing, and robust subprocess management to ensure code changes are functional.
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