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Sydney Runkle
LangChain
746 posts
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Sydney Runkle
LangChain
@sydneyrunkle
open source dev @LangChain
Somerville, MA
Joined October 2023
299
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  • Pinned
    user avatar
    Sydney Runkle
    LangChain
    @sydneyrunkle
    Jun 16
    Article cover image
    Article
    The Art of Loop Engineering
    Agents are useful because they help us automate work by taking actions in the real world. But getting agents to do valuable work reliably takes more than just a good model: it requires a carefully...
    293K0293K
  • user avatar
    Sydney Runkle
    LangChain
    @sydneyrunkle
    Sep 11, 2025
    ๐Ÿ’โ€โ™‚๏ธ Introducing human-in-the-loop Middleware! ๐Ÿ’ต Tool calls can be risky and expensive! For certain tool calls you may want to get user feedback to approve, deny, or modify them before execution. Our new middleware provides an easy off-the-shelf way to build this into your
    31K031K
  • user avatar
    Sydney Runkle
    LangChain
    @sydneyrunkle
    Jul 28, 2025
    ๐Ÿš€ LangGraph v0.6.0 is here! This release brings: โœจ A new context API for cleaner, type-safe runtime dependency injection ๐Ÿ”€ Dynamic model & tool selection for create_react_agent ๐Ÿ›ก๏ธ Enhanced type safety & autocomplete for graph building and invocation ๐Ÿ—๏ธ Durability mode for
    Release 0.6.0 ยท langchain-ai/langgraph
    From github.com
    26K026K
  • user avatar
    Sydney Runkle
    LangChain
    @sydneyrunkle
    Oct 28, 2025
    Context engineering is the number one way to get your agents to perform well. But it's hard to get right!! DeepAgents handles some of the hardest (but most important parts) for you under the hood by: ๐Ÿง  compressing context w/ summarization ๐Ÿ—„๏ธ offloading context w/ the file
    user avatar
    Harrison Chase
    LangChain
    @hwchase17
    Oct 28, 2025
    Today we're releasing 0.2 of deep agents ๐Ÿ“The main addition here is a "backend" abstraction, which allows you to swap out the filesystem that deep agents use. Can be local filesystem, a database, remote vm, anything Agent Harnesses like deep agents are becoming more important
    28K028K
  • user avatar
    Sydney Runkle
    LangChain
    @sydneyrunkle
    Oct 21, 2025
    ๐Ÿ“–Just published a new page on context engineering for agents with @langchain. ๐ŸฐIcing on the cake w/ our new docs!
    Context engineering in agents - Docs by LangChain
    From docs.langchain.com
    35K035K
  • user avatar
    Sydney Runkle
    LangChain
    @sydneyrunkle
    Oct 10, 2025
    @LangChain V1 middleware explained in < 30 seconds: ๐Ÿ” before_agent โ€” Load files, validate input โœ‚๏ธ before_model โ€” Summarize convos, trim messages ๐Ÿ”„ wrap_model_call โ€” Dynamic prompts, model, tools ๐Ÿ› ๏ธ wrap_tool_call โ€” Tool retries, error handling ๐Ÿคตafter_model โ€” Human in the
    21K021K
  • user avatar
    Sydney Runkle
    LangChain
    @sydneyrunkle
    May 29, 2025
    MCP was missing key ingredient for agentic systems - until today! A critical part of multi-agent workflows is human in the loop (HITL) functionality. Every agent in a system should be able to interact with a human supervisor. With "elicitation" (announced today), MCP has taken
    user avatar
    David Soria Parra
    @dsp_
    May 29, 2025
    After a long discussion, we landed a first version of Elicitation to the MCP draft specification. Lots more to work on and to evolve. Take a look modelcontextprotocol.io/specification/โ€ฆ
    21K021K
  • user avatar
    Sydney Runkle
    LangChain
    @sydneyrunkle
    Oct 27, 2025
    ๐Ÿ“ฃ I'm giving a talk tomorrow at @_odsc west on context engineering w/ LangChain + LangGraph! ๐Ÿ“„ Perhaps the biggest news with the LC + LG V1 releases is the rollout of our new, unified docs site. Check out our guide on context engineering w/ agents as a preview!
    Context engineering in agents - Docs by LangChain
    From docs.langchain.com
    16K016K
  • user avatar
    Sydney Runkle
    LangChain
    @sydneyrunkle
    Jun 30, 2025
    ๐Ÿš€LangGraph v0.5 is out! Check out the new features and improvements in our release notes!
    Release 0.5.0 ยท langchain-ai/langgraph
    From github.com
    15K015K
  • user avatar
    Sydney Runkle
    LangChain
    @sydneyrunkle
    Aug 5, 2025
    ๐Ÿ”๐Ÿ› ๏ธDynamic Tools in LangGraph Agent Effective agents often need access to different tools throughout a single run. For example, you might want to force the agent to use a smaller subset of tools at the start. Docs: langchain-ai.github.io/langgraph/how-โ€ฆ
    24K024K
  • user avatar
    Sydney Runkle
    LangChain
    @sydneyrunkle
    Nov 4, 2025
    ๐ŸŽฌ Starting TODAY: our new LangChain middleware series! One deep-dive video per day covering @langchain's prebuilt middleware options. ๐Ÿ‘คย Day 1: Human-in-the-Loop Middleware Use this to require human review of risky tool calls before execution!
    46K046K
  • user avatar
    Sydney Runkle
    LangChain
    @sydneyrunkle
    Nov 3, 2025
    check out our new coding agent CLI, built on top of (in this order): * deepagents (agent harness) * langchain v1 (agent framework) * langgraph v1 (agent runtime)
    user avatar
    Harrison Chase
    LangChain
    @hwchase17
    Oct 31, 2025
    ๐Ÿ’ปDeep Agents CLI Using the deepagents package, we built a simple coding CLI as an example of a coding application you could build on top of deepagents We added in a concept of memory so that it would remember instructions and guidance over time Blog: blog.langchain.com/introducing-deโ€ฆ
    13K013K
  • user avatar
    Sydney Runkle
    LangChain
    @sydneyrunkle
    Jun 27, 2025
    ๐Ÿ”ฌ OpenAI just released new deep research models. ๐Ÿค– You can build agents with those models TODAY in langgraph!
    11K011K
  • user avatar
    Sydney Runkle
    LangChain
    @sydneyrunkle
    Aug 4, 2025
    ๐Ÿ’ฐ Not every task needs your most expensive model! ๐Ÿ”€ Use dynamic model selection in LangGraph to auto-escalate from cheap to powerful models based on task complexity!
    11K011K