Luisa Crawford
Dec 10, 2025 18:52
LangChain introduces LangSmith Fetch, a CLI device that integrates LangSmith tracing into developer workflows instantly from the terminal, optimizing agent debugging processes.
LangChain has introduced the discharge of LangSmith Fetch, an modern command-line interface (CLI) device designed to streamline the debugging course of for builders working with brokers. This device integrates the excellent capabilities of LangSmith tracing instantly into the terminal and built-in improvement environments (IDEs), enhancing the effectivity of agent debugging workflows.
Addressing Developer Frustrations
LangSmith Fetch goals to get rid of the widespread friction builders encounter when debugging brokers. Historically, builders utilizing coding instruments similar to Claude Code or Cursor wanted to modify to the LangSmith UI to entry hint knowledge, disrupting their workflow. With LangSmith Fetch, builders can now entry hint knowledge instantly from the terminal, decreasing the necessity for context-switching and enhancing productiveness.
Options and Functionalities
The device is constructed round two major developer workflows: instant hint fetching and bulk knowledge export. Builders can retrieve the newest hint knowledge with a easy command, bypassing the necessity for net interfaces and handbook knowledge dealing with. As an example, the command langsmith-fetch traces –project-uuid –format json supplies prompt entry to hint knowledge in JSON format.
LangSmith Fetch additionally helps bulk export functionalities, permitting builders to extract massive datasets for analysis and evaluation. This characteristic is especially helpful for creating take a look at suites and analyzing manufacturing failures.
Empowering Coding Brokers
One of many standout options of LangSmith Fetch is its means to reinforce the capabilities of coding brokers. By offering direct entry to complete agent execution knowledge, coding brokers like Claude Code can analyze decision-making processes, determine inefficiencies, and counsel enhancements based mostly on actual execution knowledge. This integration transforms coding brokers into highly effective debugging instruments.
Integration and Compatibility
LangSmith Fetch seamlessly integrates with current LangSmith setups with out requiring extra configuration. Builders can set up the device by way of pip and start using its options instantly. The device makes use of the identical authentication protocols because the LangSmith platform, guaranteeing a easy transition for present customers.
Why a CLI Software?
The choice to develop a CLI device, fairly than an MCP server, was pushed by the necessity for flexibility and compatibility with current developer workflows. Whereas MCP (Mannequin Context Protocol) excels in real-time device calling, a CLI device affords higher versatility, permitting builders to combine it into varied workflows and instruments with out restrictions.
LangChain emphasizes the CLI’s alignment with the Unix philosophy of flexibility and composability, enabling builders to leverage LangSmith Fetch in quite a few methods, from fast hint inspections to batch processing and integration with coding brokers.
For extra data and to get began with LangSmith Fetch, go to the LangChain Weblog.
Picture supply: Shutterstock
