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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

Claude Code v2.1.251 ·

claude mcp add-json covers HTTP and WebSocket servers

claude mcp add-json help now lists HTTP and WebSocket alongside stdio and SSE.

Use it now New Features
JSON All of v2.1.251
Use it nowTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
New FeaturesKind: in v2.1.251,
What probably matters to youSection of the release
What

The help text for adding an MCP server from a JSON string now lists stdio, SSE, HTTP and WebSocket, where it previously named only stdio and SSE.

Details
  • Applies to the claude mcp add-json subcommand.
  • The transport is taken from the JSON you pass, so the wider list tells you which kinds of server definitions are accepted.
Evidence

Add an MCP server (stdio, SSE, HTTP, or WebSocket) with a JSON string

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Usage
claude mcp add-json myserver '{"type":"http","url":"https://example.com/mcp"}'
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeFixed /mcp reconnect on Remote Control showing a generic withheld-detail error instead of the real remedy when a server was disabled in…

See this entry in the whole of v2.1.251 →

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