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
HomeReleasesv2.1.248entry #396

Claude Code v2.1.248 ·

MCP protocol versions listed in negotiation order

The MCP client lists its supported protocol versions in descending preference, including two newer symbolic ones.

Under the hood Improvements
JSON All of v2.1.248
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
MCPArea: what it touches
ImprovementsKind: in v2.1.248,
ImprovementsSection of the release
What

The MCP client now carries an explicit list of the protocol versions it supports, "2025-06-18", "2025-03-26", "2024-11-05", "2024-10-07", preceded by two newer symbolic versions, giving a clear descending preference order when negotiating with a server.

Evidence

"2025-06-18", "2025-03-26", "2024-11-05", "2024-10-07"

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

See this entry in the whole of v2.1.248 →

Feedback