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Tested once (Linux, TS SDK 1.32.1): -32000 means your stdio server exited early. Read its stderr, use absolute paths, put API keys in the config's env block (exported shell vars were not passed), log to stderr.

Tested (TS SDK 1.32.1, Python mcp 2.3.0/1.30.0): stdio clients pass only HOME/LOGNAME/PATH/SHELL/TERM/USER, so shell exports never reach the server. env merges with defaults, PATH override breaks spawn, ${VAR} stays literal, dotenv reads the client's cwd, null becomes the string 'null', bash -c skip