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Only an explicit false in MCP_CONNECTION_NONBLOCKING now turns off non-blocking MCP connections.
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MCP_CONNECTION_NONBLOCKING
What
The check for MCP_CONNECTION_NONBLOCKING now compares the parsed setting against false instead of coercing the raw environment string, so any value other than an explicit false leaves non-blocking MCP server connection enabled.
Evidence
MCP_CONNECTION_NONBLOCKING
Strings lifted out of the shipped bundle, so the claim above can be checked against them.