Formal Methods (FMs) are currently essential for verifying the safety and reliability of software systems. However, the specification writing in formal methods tends to be complex and challenging to learn, requiring familiarity with various intricate formal specification languages and verification technologies. In response to the increasing complexity of software frameworks, existing specification writing methods fall short in meeting agility requirements. To address this, this paper introduces an Agile Formal Specification Language (ASL). The ASL is defined based on the K Framework and YAML Ain't Markup Language (YAML). The design of ASL incorporates agile design principles, making the writing of formal specifications simpler, more efficient, and scalable. Additionally, a specification translation algorithm is developed, capable of converting ASL into K formal specification language that can be executed for verification. Experimental evaluations demonstrate that the proposed method significantly reduces the code size needed for specification writing, enhancing agility in formal specification writing.

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