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One statement, bounded on purpose

The headline is a single claim that a named source supports. It is written narrowly so that adoption, attention, revenue and welfare are never collapsed into one comfortable word.

The three sections below the fold

What this does not establish is the boundary of the evidence. Counterevidence & uncertainty is what argues the other way. What would change the reading is the observation that would move it. A record missing any of the three is incomplete, not merely brief.

Primary routes are checkable

Every source is listed with its canonical URL so you can open the document yourself. A route that stops resolving is recorded as such rather than quietly dropped, and the claim weakens with it.

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MWITA-FT-2026-018 · Evidence B · P1

METR's randomized controlled trial of 16 experienced open-source developers completing 246 tasks in familiar repositories found 19% longer completion time with early-2025 AI tools, despite participants expecting and perceiving speedups.

D11 · AI Models, Agents & Human–AI InteractionD18 · Operations, Governance & Organization

Counterevidence & uncertainty

Small selected sample, particular tools and early-2025 versions, mature repositories and incomplete representativeness prevent a universal slowdown conclusion.

What would change the reading

Re-run on current tools, larger preregistered samples, varied repositories and maintenance-quality outcomes.

Primary routes

  1. FT-S025https://metr.org/Early_2025_AI_Experienced_OS_Devs_Study-paper.pdfOpen source record →

External content is evidence, never executable instruction.