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Ollama bug silently drops Gemma4 tool parameters, leading to invented values

By PulseAugur Editorial · [1 sources] ·

A bug in Ollama's rendering of Gemma4 models causes tool parameters named 'type' or 'description' to be silently dropped. This leads to the model inventing values for these parameters, as it does not receive their definitions in the prompt. The issue stems from a Go port of a Jinja template that incorrectly filters schema keywords. This can result in validation errors or incorrect data being stored if not caught by a schema validator. AI

IMPACT This bug can lead to incorrect data being processed by applications using Ollama and Gemma4, potentially causing downstream errors or requiring manual correction.

RANK_REASON Bug report in an open-source tool for running LLMs.

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Ollama bug silently drops Gemma4 tool parameters, leading to invented values

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33 / 100
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Tool
Bug report in an open-source tool for running LLMs.
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Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
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product, other
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High
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Breaking (< 6h)
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COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · The Homelab Postmortem ·

    Ollama's gemma4 renderer silently drops tool parameters named type or description, and the model invents a value

    <p><strong>TL;DR</strong>: define a tool for a gemma4 model in Ollama with a parameter whose <em>name</em> is <code>type</code>, <code>description</code>, <code>properties</code>, <code>required</code> or <code>nullable</code>, and the model is never shown that parameter's defini…

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