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Josu Gorostegui

Software engineer. Generalist. Machine learning.

Latest posts

  1. 13 min read

    The cost of the wrong abstraction in agent tools: using Notion as a case study

    Notion Agent CLI: a Claude Code benchmark against the official Notion MCP, showing how task-level tools reduce agent turns, context drag, and cost.

    Mean cost per session, 95% CI

    • Notion Agent CLI
    • Notion MCP
    • 95% CI, 5 runs
    1. S1 Read+Summarize −20% −23%
    2. S2 Query+Report −79% −84%
    3. S3 Copy+Modify −61% −76%
    4. S4 Set Property −21% −23%
    5. S5 Replace Section −54% −51%
    6. S6 Merge Pages −88% −89%
    7. S7 Batch Update −33% −36%
    8. S8 Copy+Append −80% −81%
    9. S9 Create Table −53% −47%
    10. S10 Import DB −23% +19%
  2. 6 min read

    Turning multimodal inputs into structured actions: a pipeline with strict validation

    Kiroween 2025 hackathon, trying Kiro's Spec-Driven Development. A multimodal AI fitness app where text, voice, and image inputs route through typed validation before any action reaches the database.

    Architecture

  3. 6 min read

    Streamlining Programming Workflows: How AI coding assistants change the game

    How tools like GitHub Copilot and ChatGPT are transforming the coding process and boosting developer productivity.

    Time to finish the task

    with Copilot 1 h 11 min
    without 2 h 41 min

    95 developers, 35 per group finished · times of those who finished

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