Powering the Agent Development Lifecycle. Makers of LangSmith and @LangChain_OSS and @LangChain_JS.

Joined November 2022
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Stop manually triaging agent failures. Let LangSmith Engine fix it.
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🫖 @BraceSproul and @jakebroekhuizen spill the tea on open source models.
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Elite placement by @hwchase17 on CalTrain
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ICYMI: Managed Deep Agents integrates with LangSmith Sandboxes. See how you can allow your agent to safely execute code: langchain.com/blog/introduci…
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The IRL LangSmith Engine that could.
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Don't miss our Chicago meetup with @focused_dot_io! Info RSVP: luma.com/l4kbbuln
Meet the newest @LangChain trace engineer in Chicago on June 22nd and see @pollenrobotics reachy pull up traces, explain them, and do all the cool things a deep agent can do! Oh and @hwchase17 and I will be talking on deep agents, AI in the Enterprise, and a ton more too...
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Jun 12
When Box transitioned Box AI into a multi-step agentic system, we chose @LangChain's LangGraph over building a custom execution engine from scratch. Our full architectural breakdown covers how agents are defined and compiled at runtime, how the Global Agent spawns sub-agents dynamically, how LangGraph's checkpointing powers session resumability, and how Box enforces user-scoped security at the platform level, not the LLM level. Read here.👇 blog.box.com/how-box-built-i…
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.@Box Agent is built on Deep Agents. ✅ Cross-library search ✅ Multi-doc synthesis ✅ Structured reports ✅ All within Box's existing security and permissions model
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LangSmith Engine closes the ultimate loop by turning every trace into signal
everybody's talking about loops!! how can you instrument them with langchain? 1. token loop supported by a model (choose any model with langchain) 2. create_agent gives you the agent loop (model tools repeat until done) 3. deepagents gives you the self verification loop (agent loop verify repeat until satisfied) 4. deployments give you the meta loop (trigger agent runs in reaction to events that help improve a system) 5. i think the ??? loop is what we're trying to close with engine: run an agent over each trace and figure out what to tweak - prompts, tools, self verification, etc so that your meta loop is more effective per cycle.
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4 ways you can create skills in LangSmith Fleet: ✅ Create with AI: Open Chat and describe what you want the skill to do. ✅ Generate during agent creation: When you create a new agent, Fleet automatically generates relevant skills if the agent would benefit from them. ✅ Start from a template ✅ Write manually langchain.com/blog/skills-in…
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Let’s talk about the agent lethal trifecta, coined by @simonw 1️⃣Access to sensitive data 2️⃣Exposure to untrusted content 3️⃣The ability to communicate externally If all 3 apply to your agent, it needs a sandbox. langchain.com/blog/how-to-ch…?
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We'd love your feedback!
we revamped our skills docs this week! what are they missing? what questions do you have about skills that are unanswered here? docs.langchain.com/oss/pytho…
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Great insights on loops from @sydneyrunkle
everybody's talking about loops!! how can you instrument them with langchain? 1. token loop supported by a model (choose any model with langchain) 2. create_agent gives you the agent loop (model tools repeat until done) 3. deepagents gives you the self verification loop (agent loop verify repeat until satisfied) 4. deployments give you the meta loop (trigger agent runs in reaction to events that help improve a system) 5. i think the ??? loop is what we're trying to close with engine: run an agent over each trace and figure out what to tweak - prompts, tools, self verification, etc so that your meta loop is more effective per cycle.
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It's easy to build loops with LangChain/DeepAgents!
everybody's talking about loops!! how can you instrument them with langchain? 1. token loop supported by a model (choose any model with langchain) 2. create_agent gives you the agent loop (model tools repeat until done) 3. deepagents gives you the self verification loop (agent loop verify repeat until satisfied) 4. deployments give you the meta loop (trigger agent runs in reaction to events that help improve a system) 5. i think the ??? loop is what we're trying to close with engine: run an agent over each trace and figure out what to tweak - prompts, tools, self verification, etc so that your meta loop is more effective per cycle.
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"Validate your validators." The eval advice nobody is following. ⏯️ Watch @sh_reya @HamelHusain’s Interrupt keynote on the return of the data scientist: youtu.be/QDQT99csHJQ
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Tracking your agents shouldn’t be a workout. LangSmith Observability helps you understand how your agents are performing in real-time so you can get to the root cause of issues faster.
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