# Useful but Little-Known Features of OpenAI Agent SDK 🌍 Are massive tool outputs eating up your context window? ToolOutputTrimmer automatically trims older tool outputs, keeping your context lean and efficient. 📌 Title: Tool Output Trimmer Extension 🔗 URL: 🧩 Overview `ToolOutputTrimmer` works as a `CallModelInputFilter`, trimming tool outputs in conversation history using a sliding window approach. Recent turns (default 2) are preserved as-is, while older turns with outputs exceeding `max_output_chars` (default 500) are truncated to just the first `preview_chars` (default 200). It operates non-destructively using shallow copies, leaving the original messages untouched. 🛠 How to use it ```python from agents import RunConfig from agents.extensions.tool_output_trimmer import ToolOutputTrimmer # Use with defaults trimmer = ToolOutputTrimmer() # Custom configuration trimmer = ToolOutputTrimmer( recent_turns=3, # Keep last 3 turns intact max_output_chars=1000, # Trim outputs over 1000 chars preview_chars=300, # Keep first 300 chars as preview trimmable_tools=["search", "fetch_page"], # Only trim specific tools ) # Apply via RunConfig config = RunConfig(call_model_input_filter=trimmer) result = await "question", run_config=config) ``` 🏗 Building it into production ・Apply to tools that return large text payloads (search, web fetch, etc.) ・Use `trimmable_tools` to selectively target tools while preserving critical outputs ・Tune `recent_turns` based on how much recent context your agent needs for reasoning ・Non-destructive design allows inspecting original messages during debugging 💡 Use cases 🔍 Optimizing context in RAG pipelines with large search results 📄 Managing long web page fetch outputs efficiently 🔄 Reducing token consumption in multi-turn conversations 💰 Cutting API costs through effective context window utilization ⚠️ Watch out Trimming removes detail from older turns, so if your agent needs to reference past tool outputs, set `recent_turns` high enough. When `trimmable_tools` is not specified, all tools are subject to trimming. ✨ Keep your context window lean and your agents sharp with ToolOutputTrimmer. #OpenAIAgentSDK# #AIAgent#