What
MCP servers are outside services Claude Code can connect to for extra tools. When the CLAUDE_CODE_REMOTE environment variable is set, marking a remote session, and such a service needs Claude Code to register with it, you now see "Claude Code couldn't register with this service." followed by a link to connectors.
Other messages are reworded too:
- "claude.ai account" now reads "Claude account"
- "administrator" now reads "admin"
Why
In a remote session you are pointed to the connectors page instead of being told to run command-line options that do not apply there.
Names in the bundleCLAUDE_CODE_REMOTE
Documented inclaude-code/agent-sdk/typescript