Generate accessibility alt text for an image with a local vision LLM. Wraps kuzco's tool_llm_image_alt_text() ellmer tool. Use when the task needs a short textual description of an image, e.g. for accessibility, captions, or image indexing.
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Generate alt text for an image using a local vision language model, exposed as an ellmer tool by the kuzco R package.
The user wants a textual description of an image: accessibility alt text, a caption, or a quick summary of image contents for indexing or search.
Register the tool on an ellmer chat. The model and provider are fixed at registration; the LLM controls the image path, extra prompt text, and output language per call.
library(kuzco)
library(ellmer)
chat <- chat_ollama(model = "qwen2.5vl")
chat$register_tool(tool_llm_image_alt_text())
To use a different model or a hosted provider, pass them to the constructor:
chat$register_tool(tool_llm_image_alt_text(
llm_model = "qwen2.5vl",
provider = "ollama"
))
image (required): local file path to a jpeg, jpg, or png image.additional_prompt (optional): extra instructions appended to the image prompt,
e.g. "focus on the people in the foreground".language (optional): output language, e.g. "English", "Spanish".Compact JSON text describing the image, returned to the model as the tool result. Relay the description to the user; do not invent details beyond what the tool returned.
User: "Write alt text for img/photo.jpg"
- Call
kuzco_image_alt_textwithimage = "img/photo.jpg".- Return the description as the alt text.
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Classify an image and describe its contents with a local vision LLM. Wraps kuzco's tool_llm_image_classification() ellmer tool. Use when the task needs image classification, object identification, or a structured description of what an image contains.
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Run a custom computer-vision prompt against an image with a local vision LLM. Wraps kuzco's tool_llm_image_custom() ellmer tool. Use when none of the specialized kuzco image skills (classification, OCR, recognition, sentiment, alt text) fit the task.
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Extract text visible in an image (OCR) with a local vision LLM. Wraps kuzco's tool_llm_image_extract_text() ellmer tool. Use when the task needs reading text from screenshots, documents, signs, labels, or any image containing writing.
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Recognize and locate instances of an object in an image with a local vision LLM. Wraps kuzco's tool_llm_image_recognition() ellmer tool. Use when the task needs finding, counting, or locating specific objects (faces, cars, animals) in an image.
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Analyze the sentiment or mood conveyed by an image with a local vision LLM. Wraps kuzco's tool_llm_image_sentiment() ellmer tool. Use when the task needs the emotional tone of an image, e.g. for content moderation, marketing, or curation.
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