[BUG] Repeated task failure (MCP server integration)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Feedback: Poor session quality - 2026-03-24

During today's Claude Code session, the following issues were encountered:

Repeated task failure (MCP server integration): The task "Implement MCP server integration" was attempted at least 3 separate times today without successful completion, requiring repeated restarts. Additional related tasks — "Access Vercel logs via MCP server" and "Debug Vercel MCP server issues" — also appeared, meaning 5 out of 7 tasks today were MCP-related. This is a significant time sink and suggests the agent is either not retaining context between sessions or is hitting a recurring blocker it cannot self-resolve.

Unknown skill error: Running /mcp returned "Unknown skill: mcp" instead of handling the command gracefully or providing a helpful error explaining what MCP-related commands are available.

Overall session quality: The repeated failures, lack of forward progress, and poor error handling made today's experience very disappointing and frustrating.

What Should Happen?

I'd appreciate better persistence across sessions for complex multi-step tasks, clearer error messaging for unrecognized commands, and generally higher quality agentic task execution.
Note: Multiple MCP-related bugs are actively being reported by other users on the same date (see GitHub issues #38298, #38296, #38285, #38275), suggesting the repeated failures I experienced today may be caused by underlying platform bugs rather than task complexity.

Error Messages/Logs

Steps to Reproduce

1. Set up a project that requires MCP server integration (e.g. connecting to Vercel logs via MCP)
2. Ask Claude Code to implement the MCP server integration
3. Claude begins the task but fails to complete it — either hitting an error, losing context, or stalling
4. Start a new session and attempt the same task again
5. Same failure repeats

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

cluade code windows web app

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_