Follow Discord
Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeReleasesv2.1.299entry #218

Claude Code v2.1.299 ·

Clearer messages when an MCP server uses a name or address Claude Code reserves

MCP servers configured with a reserved name or address are now refused with an explicit message saying why

You'll notice Improvements
JSON All of v2.1.299
You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
ImprovementsKind: in v2.1.299,
ImprovementsSection of the release

Unclear It is not stated which names and addresses are reserved.

What

MCP servers are add-ons that give Claude extra tools. Claude Code already refused servers configured under certain reserved names; it now says so with new wording:

  • A server with a reserved name is skipped with a message that it "is a reserved MCP server name and was not loaded".
  • A server at a reserved address is refused with "Refused - Claude Code reserves this address for its own use", and a note that no administrator set this.

The managedMcpServers setting now checks server names with shared rules instead of its own built-in check.

Why

If you give a server a reserved name or address, you now get a clear reason it did not load.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtIt is not stated which names and addresses are reserved.

See this entry in the whole of v2.1.299 →

Feedback