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Ollama gemma4 renderer bug drops tool parameters, causing model errors

By PulseAugur Editorial · [2 sources] ·

Ollama's gemma4 renderer has a bug where it silently drops tool parameters named 'type' or 'description'. This causes the model to either invent a value for the parameter or omit it entirely, depending on the model size. The issue stems from a Go port of a Jinja template that incorrectly filters schema keywords. Renaming the parameter resolves the problem, but a fix is pending. AI

IMPACT This bug can lead to incorrect or missing data in tool calls made by Gemma4 models within Ollama, potentially causing application errors.

RANK_REASON Bug report in a specific tool's rendering process.

Read on Mastodon — sigmoid.social →

AI-generated summary · Google Gemini · from 2 sources. How we write summaries →

Ollama gemma4 renderer bug drops tool parameters, causing model errors

How we ranked this

Signal score
14 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
Bug report in a specific tool's rendering process.
Source corroboration
2 independent sources
Multiple independent publishers reporting the same story raises confidence that it's real and newsworthy.
Topics
product, other
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [2]

  1. Mastodon — sigmoid.social TIER_1 English(EN) · [email protected] ·

    Ollama's gemma4 renderer silently drops tool parameters named type or description, and the model invents a value # ollama # llm # ai # debugging # software # co

    Ollama's gemma4 renderer silently drops tool parameters named type or description, and the model invents a value # ollama # llm # ai # debugging # software # coding # development # engineering # inclusive # community Ollama's gemma4 renderer silently drops tool parameters named t…

    LINKS dev.to/…/ollamas-gemma4-renderer-silently…
  2. 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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