AI IDEs or Autonomous Agents? Measuring the Impact of Coding Agents on Software Development

• URL: http://arxiv.org/abs/2601.13597v1
• Date: Tue, 20 Jan 2026 04:51:56 GMT
• Title: AI IDEs or Autonomous Agents? Measuring the Impact of Coding Agents on Software Development
• Authors: Shyam Agarwal, Hao He, Bogdan Vasilescu,
• Abstract summary: Large language model (LLM)-based coding agents increasingly act as autonomous contributors that generate and merge pull requests.<n>We present a longitudinal causal study of agent adoption in open-source repositories using staggered difference-in-differences with matched controls.
• Score: 12.50615284537175
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Large language model (LLM)-based coding agents increasingly act as autonomous contributors that generate and merge pull requests, yet their real-world effects on software projects are unclear, especially relative to widely adopted IDE-based AI assistants. We present a longitudinal causal study of agent adoption in open-source repositories using staggered difference-in-differences with matched controls. Using the AIDev dataset, we define adoption as the first agent-generated pull request and analyze monthly repository-level outcomes spanning development velocity (commits, lines added) and software quality (static-analysis warnings, cognitive complexity, duplication, and comment density). Results show large, front-loaded velocity gains only when agents are the first observable AI tool in a project; repositories with prior AI IDE usage experience minimal or short-lived throughput benefits. In contrast, quality risks are persistent across settings, with static-analysis warnings and cognitive complexity rising roughly 18% and 35%, indicating sustained agent-induced complexity debt even when velocity advantages fade. These heterogeneous effects suggest diminishing returns to AI assistance and highlight the need for quality safeguards, provenance tracking, and selective deployment of autonomous agents. Our findings establish an empirical basis for understanding how agentic and IDE-based tools interact, and motivate research on balancing acceleration with maintainability in AI-integrated development workflows.

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