This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A set of tools for software development, often used in sequence so that the output of one tool comprises the input of the next.

"So, a toolchain is a very sensitive piece of software, as any bug in one of the components, or a poorly configured component, can lead to execution problems, ranging from poor performance, to applications ending unexpectedly, to mis-behaving software (which more than often is hard to detect), to hardware damage, or even to human risks (which is more than regretable)."

toolkit    toolset