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Source note2 min read

The Spec Growth Engine: Spec-Anchored, Code-Coupled, Drift-Enforced Architecture for AI-Assisted Software Development

Source

arXiv

arxiv.org/abs/2606.27045v1

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Source

Plain-Language Brief

The Spec Growth Engine is a new framework that aims to address two issues with AI coding agents: context explosion and silent spec-code drift. It uses a machine-readable spec graph, a Spine context assembler, vertical-slice growth protocol, and a drift gate to manage these issues effectively.

What the Document Says

  • The Spec Growth Engine is a framework for AI-assisted software development.
  • It aims to solve two structural failure modes of AI coding agents: context explosion and silent spec-code drift.
  • The framework uses a machine-readable spec graph with explicit contract/design separation.
  • A Spine context assembler is used to scope the agent's context to an ownership path.
  • Vertical-slice growth protocol enforces hardest-first ordering.
  • A drift gate makes spec-code divergence a blocking merge condition.
  • The design incorporates established software engineering principles such as Parnas information hiding, C4, ADRs, Walking Skeleton, Reflexion Models, and Fitness Functions.

Key Concepts Mentioned

  • AI coding agents
  • context explosion
  • silent spec-code drift
  • Spec Growth Engine
  • machine-readable spec graph
  • Spine context assembler
  • vertical-slice growth protocol
  • drift gate

Claims Made by the Document

  • The Spec Growth Engine addresses the issues of context explosion and silent spec-code drift.
  • It incorporates established software engineering principles.

Evidence Used

  • The text describes how the Spec Growth Engine tackles context explosion and silent spec-code drift.
  • The text mentions several software engineering principles that are incorporated into the design of the Spec Growth Engine.

Methods / Approach

UNKNOWN

Limitations Stated by the Authors

UNKNOWN

Limitations Noted by the Agent

Agent interpretation — not from the source.

UNKNOWN

Open Questions

UNKNOWN

Notes for Future Q&A

May include interpretation. Labeled where it does.

UNKNOWN

Raw Abstract / Excerpt

AI coding agents dramatically accelerate implementation speed but introduce two structural failure modes that existing spec-driven approaches do not fully solve: (1) context explosion -- the agent must reason over an entire repository at once, degrading output quality as the context window fills; and (2) silent spec-code drift -- code evolves, the specification does not, and the divergence becomes invisible until it is costly to repair. We present the Spec Growth Engine, a lightweight framework that addresses both failure modes through a machine-readable spec graph whose nodes carry explicit contract/design separation, a Spine context assembler that scopes agent context to an ownership path, a vertical-slice growth protocol that enforces hardest-first ordering, and a drift gate that makes spec-code divergence a blocking merge condition. The design synthesises well-established software engineering principles (Parnas information hiding, C4, ADRs, Walking Skeleton, Reflexion Models, Fitness Functions) into a lean, code-coupled, machine-enforced whole -- without the overhead of heavy-weight frameworks such as RUP or MDA.