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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.248

MCP servers connect three at a time

Use it now
Useful4 Signal3
MCP Notable not in their notes

MCP servers now connect three at a time; set MCP_SERVER_CONNECTION_BATCH_SIZE to change it.

MCP_SERVER_CONNECTION_BATCH_SIZE
What

At startup MCP servers are now connected in batches rather than all at once. The batch size is 3 unless MCP_SERVER_CONNECTION_BATCH_SIZE is set.

Evidence

return a.MCP_SERVER_CONNECTION_BATCH_SIZE ?? 3;

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.248 →