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A new file-based locking mechanism prevents concurrent MCP server OAuth token refreshes from colliding. Lock files (mcp-refresh-*.lock) coordinate between processes with retry logic and timeout handling.
Evidence
Lock file naming (search for "mcp-refresh-")
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.