langchain-pexafy

LangChain and LangGraph tools for Pexafy: semantic search over 9M+ free stock photos (Unsplash, Pexels, Pixabay and six more sources). Each photo comes back with its URL, alt text, licence and credit line.

For LangChain.js, see js/ (npm install langchain-pexafy).

Install

pip install -U langchain-pexafy
export PEXAFY_API_KEY="pexafy_..."

Free key, no card: pexafy.com/dashboard/api-keys/create (5,000 requests a month).

Use

pip install -U langchain langchain-anthropic  # for this example; any LangChain chat model works
export ANTHROPIC_API_KEY="sk-ant-..."

from langchain.agents import create_agent
from langchain_pexafy import PexafyToolkit

agent = create_agent("anthropic:claude-haiku-4-5", tools=PexafyToolkit().get_tools())

result = agent.invoke({"messages": [
    {"role": "user", "content": "Find a header photo for a post about remote work, with its credit line."}
]})
print(result["messages"][-1].content)

create_agent runs on LangGraph. The tools also work with ToolNode and any model's bind_tools(), sync or async.

Tools

PexafyToolkit().get_tools() returns all three. Options on each: api_key, max_results (photos per search when the model gives no count; default 6, max 20).

Output

The tool message is a JSON list, one record per photo:

{
  "rank": 1,
  "photo_id": "019e1ea7-2e82-7a34-a451-4c6c7c8250f4",
  "alt_text": "Red bicycle parked against white wall with front wheel facing left and back wheel right",
  "url": "https://images.unsplash.com/photo-1520538254843-27a40bae5e3a?w=1280",
  "thumbnail_url": "https://images.unsplash.com/photo-1520538254843-27a40bae5e3a?w=400",
  "width": 4896,
  "height": 3264,
  "orientation": "landscape",
  "dominant_color": "#CAB8B4",
  "photographer": "Mitchel Lensink",
  "source": "Unsplash",
  "source_page_url": "https://unsplash.com/photos/red-bicycle-near-white-wall-Hx_dY7Xeszo",
  "license": "free",
  "credit": "Photo by Mitchel Lensink on Unsplash (https://pexafy.com/legal/licenses/#unsplash)"
}

ToolMessage.artifact holds the full API records (every image size).

Errors

• Spent quota, unknown photo_id, server error: returned to the model as a tool error.
• Per-minute rate limit: retried automatically.
• Invalid key: raises pexafy.AuthenticationError.

Licence

MIT. On the free plan, show the credit line next to each photo you publish.