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instruction stack
also operational instruction stack
Definition of instruction stack
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: the combined, ordered set of instructions and control information supplied to an AI agent, including system and developer messages, project or rules files, tool definitions, skills, policies, and environmental context in addition to the user's prompt
- The audit captured the coding agent's full instruction stack instead of recording only the user's request.
- A rule hidden deep in the instruction stack conflicted with the repository's AGENTS.md and changed how the agent edited the code.
Two meanings, one word
In everyday English
A stack is a set of layers arranged together; an instruction stack is the layered set of directions that reaches an AI model before it acts.
In AI
The combined, ordered set of instructions and control information supplied to an AI agent, including system and developer messages, project or rules files, tool…
Origin & history
The phrase instruction stack was already used by coding-agent tools and practitioners for layered rules loaded from different scopes. A 2026 empirical study of 1,886 coding-agent releases formalized it as the full set of instructions, tool definitions, and environmental context sent with a request, showing why a system prompt alone does not describe everything an agent receives.
Editorial references
Sources & further reading
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Cite this entry
"Instruction stack." AI Dictionary, Dadgogo, https://dadgogo.com/dictionary/instruction-stack/. Accessed 29 Oct. 2026.