Issue: MCP Client disconnects immediately if Server returns a Prompt with an empty name {"name":""} #11816

Description

Description

The OpenCode MCP client appears to have strict validation on the prompts/list capability. If an MCP server returns a prompt object containing an empty string for the name ({"name": ""}), OpenCode throws an error and immediately closes the socket/connection with MCP error -32000.

This prevents the use of servers that may have minor schema bugs (like the official reportportal/mcp-server:1.0.0) but are otherwise functional.

Observed Behavior
The connection status shows "Connected" briefly, then logs an error and disconnects. The tools never populate.

Log Output:
ERROR service=mcp clientName=reportportal promptName= error=MCP error -32000: Connection closed failed to get prompt from MCP server

Expected Behavior
OpenCode should:

Detect the invalid name property.

Log a warning (e.g., Skipping invalid prompt: name is empty).

Continue processing the rest of the valid prompts/tools in the list.

Keep the connection alive.

Context / Environment
OS: macOS

Problematic Server: reportportal/mcp-server:1.0.0 (Docker)

Attempted Workaround

We attempted to strip the invalid JSON stream using a middleware/proxy wrapper (e.g. perl substitution) to remove the empty prompt entry. However, this proved unstable.

We were ultimately forced to downgrade the OpenCode CLI to a previous version to bypass this strict validation crash, suggesting this may be a regression in the latest CLI release.

Plugins

No response

OpenCode version

most recent version

Steps to reproduce

Reproduction Steps

1. Create a dummy MCP server script (bad-server.sh) that mimics the ReportPortal v1.0.0 behavior:

#!/bin/bash
# Simple mock to reproduce the crash
while read line; do
  # 1. Handshake
  if [[ "$line" == *"initialize"* ]]; then
    echo '{"jsonrpc":"2.0","id":1,"result":{"protocolVersion":"2024-11-05","capabilities":{"prompts":{}},"serverInfo":{"name":"bug-repro","version":"1.0"}}}'
  fi
  # 2. OpenCode asks for prompts
  if [[ "$line" == *"prompts/list"* ]]; then
    # 3. Server returns a prompt with an empty name
    echo '{"jsonrpc":"2.0","id":2,"result":{"prompts":[{"name":"","description":"This crashes OpenCode"},{"name":"valid_prompt","description":"This should work"}]}}'
  fi
done

2. Register this server in opencode.jsonc.

3. Run opencode mcp list.

Screenshot and/or share link

No response

Operating System

macOS 26.2

Terminal

No response