LangChain(@LangChainAI)

It wouldn't be a trip to NYC without a stop in Times Square. @BrexHQ

LangChain (@LangChain) — Fri, 11 Sep 2026 19:34:27 GMT

It wouldn't be a trip to NYC without a stop in Times Square.

@BrexHQ

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Agent harnesses explained in <90 seconds. TLDR: if you’re not working on the model, you’re worki...

LangChain (@LangChain) — Fri, 11 Sep 2026 16:48:33 GMT

Agent harnesses explained in <90 seconds.

TLDR: if you’re not working on the model, you’re working on the harness.

https://t.co/w31FYeBAel

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Great thread from @AdamRLucek on LangSmith Engine!

LangChain (@LangChain) — Fri, 11 Sep 2026 16:14:38 GMT

Great thread from @AdamRLucek on LangSmith Engine!

Adam Łucek@AdamRLucek

I've been working on Engine, the "Agent for Agent Engineering," for the last 5 months and (while I might be a little biased) I think it's pretty cool- so I wanted to talk a bit about how we've been approaching automated agent development with an agent of our own using trace data and project context 🧵

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LangSmith is @PodiumHQ's sanctioned go-to platform for every team building agents. Walker Ward on ...

LangChain (@LangChain) — Fri, 11 Sep 2026 15:07:01 GMT

LangSmith is @PodiumHQ's sanctioned go-to platform for every team building agents. 

Walker Ward on why one shared platform beats a dozen one-off ones.

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Agents are moving quickly into production across Europe and the Middle East. Our latest guide looks...

LangChain (@LangChain) — Fri, 11 Sep 2026 12:50:10 GMT

Agents are moving quickly into production across Europe and the Middle East.

Our latest guide looks at how @SchneiderElec, @Vodafone, and @mondaydotcom are building the infrastructure and operating practices needed to scale agents across the enterprise.

Read the guide: info.langchain.com/guide/scaling-…

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Full story on how Credit Genie set this up: https://t.co/HlnkwEL74p

LangChain (@LangChain) — Thu, 10 Sep 2026 18:54:41 GMT

Full story on how Credit Genie set this up: langchain.com/blog/how-credi…

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Credit Genie's coding agents used to guess at how a repo worked. Now they just check their OpenWiki.

LangChain (@LangChain) — Thu, 10 Sep 2026 18:54:40 GMT

Credit Genie's coding agents used to guess at how a repo worked. Now they just check their OpenWiki.

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The loop runs without anyone remembering to run it: New repo → added to config → OpenWiki opens a s...

LangChain (@LangChain) — Thu, 10 Sep 2026 18:54:40 GMT

The loop runs without anyone remembering to run it:

New repo → added to config → OpenWiki opens a stub PR → merged, repo's onboarded.

Every night, it checks commits and opens a PR when something's changed.

A daily sweep merges pending PRs and rebuilds the portal.

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Add skills to your agent, swap the model, tweak a tool description. How do you know you didn't break...

LangChain (@LangChain) — Thu, 10 Sep 2026 17:00:18 GMT

Add skills to your agent, swap the model, tweak a tool description. How do you know you didn't break what already worked?

Managed Deep Agents ships with @harborframework.

Evals run in a fresh container every time, tracked in LangSmith.

What you need to know in 9 minutes:

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Point a coding agent at the LangSmith CLI and it can build you an online LLM-as-a-judge: define the ...

LangChain (@LangChain) — Thu, 10 Sep 2026 14:59:06 GMT

Point a coding agent at the LangSmith CLI and it can build you an online LLM-as-a-judge: define the rubric, wire it to every incoming trace, adjust the sampling rate, all from your terminal.

Here's a 5 minute tutorial.

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@clay @jeffbarg Watch the full conversation: https://t.co/JStaVgW9pH

LangChain (@LangChain) — Thu, 10 Sep 2026 14:00:24 GMT

@clay@jeffbarg Watch the full conversation: youtube.com/watch?v=cx6_tb…

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Manual review works at small scale. At millions of agent runs a month, it falls apart, so @Clay reli...

LangChain (@LangChain) — Thu, 10 Sep 2026 14:00:23 GMT

Manual review works at small scale. At millions of agent runs a month, it falls apart, so @Clay relies on LangSmith's online evaluators and is testing its insights product to understand agent behavior. 

@jeffbarg explains.

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.@tavilyai is sponsoring Interrupt NYC! Stop by their booth during the event and see how you can co...

LangChain (@LangChain) — Thu, 10 Sep 2026 13:04:00 GMT

.@tavilyai is sponsoring Interrupt NYC!

Stop by their booth during the event and see how you can connect your AI agents to the web.

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@tavilyai Learn more about Interrupt, The Agent Conference by LangChain and RSVP: https://t.co/fPMwm...

LangChain (@LangChain) — Thu, 10 Sep 2026 13:04:00 GMT

@tavilyai Learn more about Interrupt, The Agent Conference by LangChain and RSVP: interrupt.langchain.com

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The @browserbase team is working on building the best tools for agents to use the browser It's supe...

LangChain (@LangChain) — Wed, 09 Sep 2026 21:13:52 GMT

The @browserbase team is working on building the best tools for agents to use the browser

It's super easy to attach these to your deepagents:
docs.langchain.com/oss/python/int…

Kyle Jeong@kylejeong

x.com/i/article/2097…

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NYC! You’re invited to learn about voice agents with @carodivittorio ⤵️

LangChain (@LangChain) — Wed, 09 Sep 2026 20:36:11 GMT

NYC!

You’re invited to learn about voice agents with @carodivittorio ⤵️

Caroline di Vittorio@carodivittorio

NYC 🗽 Join us on September 22 for a meetup on voice agents, where I'll be talking about practical ways to evaluate them!

RSVP here:luma.com/l27vmv25H

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Just one week to go until the LangSmith Roadshow in Dallas! Hear from @hwchase17, go hands-on with ...

LangChain (@LangChain) — Wed, 09 Sep 2026 20:00:58 GMT

Just one week to go until the LangSmith Roadshow in Dallas!

Hear from @hwchase17, go hands-on with Deep Agents + LangSmith Engine, and meet the LangChain community!

RSVP today! events.langchain.com/register/e0862…

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We’re joining the @AWSstartups program as an Activate Exclusive Offers partner. Now, eligible start...

LangChain (@LangChain) — Wed, 09 Sep 2026 18:56:50 GMT

We’re joining the @AWSstartups program as an Activate Exclusive Offers partner.

Now, eligible startups can now access up to $10,000 in LangSmith credits to help them build, test, evaluate, deploy, and operate agents on @awscloud.

Interested in getting started? Visit startups.aws.com/offers

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In 10 minutes, we set up Connections in Managed Deep Agents. Watch as we configure: 1️⃣ A shared @t...

LangChain (@LangChain) — Wed, 09 Sep 2026 17:47:34 GMT

In 10 minutes, we set up Connections in Managed Deep Agents. Watch as we configure:

1️⃣ A shared @tavilyai key every user pulls from

2️⃣ A @Linear connection, OAuth via just a server URL

3️⃣ A GitHub OAuth app that files tickets under the user's own login, not a bot

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In 10 minutes, we set up Connections in Managed Deep Agents. Watch as we set up: 1️⃣ A shared @tavi...

LangChain (@LangChain) — Wed, 09 Sep 2026 17:44:49 GMT

In 10 minutes, we set up Connections in Managed Deep Agents. Watch as we set up:

1️⃣ A shared @tavilyai key every user pulls from

2️⃣ A @Linear connection, OAuth via just a server URL

3️⃣ A GitHub OAuth app that files tickets under the user's own login, not a bot

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New in Managed Deep Agents 0.7.0+: Connections. Agent-owned secrets for tools everyone shares, user...

LangChain (@LangChain) — Wed, 09 Sep 2026 17:04:54 GMT

New in Managed Deep Agents 0.7.0+: Connections.

Agent-owned secrets for tools everyone shares, user-owned OAuth for anything that should carry a real person's identity.

Store your credentials in your LangSmith workspace instead of .env.

langchain.com/blog/connectio…

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You can use the LangSmith CLI to pull your flagged traces, classify each one by issue type, and buil...

LangChain (@LangChain) — Wed, 09 Sep 2026 15:00:02 GMT

You can use the LangSmith CLI to pull your flagged traces, classify each one by issue type, and build an eval dataset with a split for each.

A 3 minute tutorial ⤵️

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.@WeberShandwick + @focused_dot_io are joining us at Interrupt NYC. https://t.co/K62OFGXSi1 They'll...

LangChain (@LangChain) — Wed, 09 Sep 2026 13:02:09 GMT

.@WeberShandwick + @focused_dot_io are joining us at Interrupt NYC. interrupt.langchain.com/nyc

They'll share how a small delivery team built an agent factory on LangGraph, turning brand-tailored agent deployments from weeks of engineering into often <1hr of configuration.

Catch this talk + more @ Interrupt NYC.

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Next stop, NYC!

LangChain (@LangChain) — Tue, 08 Sep 2026 21:00:58 GMT

Next stop, NYC!

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New in Managed Deep Agents 0.7: Connections

LangChain (@LangChain) — Tue, 08 Sep 2026 20:46:44 GMT

New in Managed Deep Agents 0.7: Connections

Caspar@caspar_br

Agent auth is hard, but it shouldn't be!

Your agent needs to act as someone: sometimes that's one shared identity, sometimes it's the person asking. To get either right you'll need an OAuth app for each service, a token store, refresh logic, and a consent flow

Today we're fixing this with Managed Connections: define who your agent acts as in code, and the rest is handled for you:

𝚊𝚐𝚎𝚗𝚝 -> agent uses its own token
𝚞𝚜𝚎𝚛 -> agent uses the user's token, guiding them through the consent flow if they haven't connected yet

With a single argument you avoid the whole OAuth dance. Available now, in 𝚖𝚊𝚗𝚊𝚐𝚎𝚍-𝚍𝚎𝚎𝚙𝚊𝚐𝚎𝚗𝚝𝚜 0.7

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.@PodiumHQ's iteration loop runs through LangSmith end to end: user feedback becomes a trace, traces...

LangChain (@LangChain) — Tue, 08 Sep 2026 19:02:04 GMT

.@PodiumHQ's iteration loop runs through LangSmith end to end: user feedback becomes a trace, traces get reviewed, and recurring patterns get codified into LangSmith eval cases. 

Walker Ward on why that beats playing whack-a-mole with bugs.

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@PodiumHQ Watch the full conversation: https://t.co/EPdH7MFWpH

LangChain (@LangChain) — Tue, 08 Sep 2026 19:02:04 GMT

@PodiumHQ Watch the full conversation: youtube.com/watch?v=J77ro1…

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Adopting a coding agent for your org can mean a few less-than-optimal commitments at once: 🔒 Lockin...

LangChain (@LangChain) — Tue, 08 Sep 2026 17:41:37 GMT

Adopting a coding agent for your org can mean a few less-than-optimal commitments at once:
🔒 Locking into a single vendor’s models
💲 Uncontrollable pricing plans + runaway token bills
🧠 Handing off your intelligence to a closed system

Dcode is open source, puts your team in control, and lets you own your intelligence. 

Our latest LangChain Academy course shows you how.

LangChain@LangChain

Deep Agents Code, or dcode, is an open source coding agent that works with any model + gives your team full control over usage.

In our latest LangChain Academy course, learn how to install + run dcode in a way designed for enterprise teams. academy.langchain.com/courses/dcode-…

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New in Deep Agents: Subagents can now fork the supervisor's full conversation instead of starting fr...

LangChain (@LangChain) — Tue, 08 Sep 2026 17:18:28 GMT

New in Deep Agents: Subagents can now fork the supervisor's full conversation instead of starting from a blank context window.

Everything you need to know from @t_bengre and @chester_curme on the @LangChain_OSS team ⤵️

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@getcandidly Full story: https://t.co/mTxacVG2hI

LangChain (@LangChain) — Tue, 08 Sep 2026 15:51:41 GMT

@getcandidly Full story: langchain.com/blog/how-candi…

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78% resolution when a conversation is going well. 30% when it's not. @GetCandidly's state model mea...

LangChain (@LangChain) — Tue, 08 Sep 2026 15:51:40 GMT

78% resolution when a conversation is going well. 30% when it's not.

@GetCandidly's state model measures this gap in real time, and closes it. 

One prompt insert mirroring the user's wording at the right turn can move a disengaging conversation back up.

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Deep Agents Code, or dcode, is an open source coding agent that works with any model + gives your te...

LangChain (@LangChain) — Tue, 08 Sep 2026 15:10:11 GMT

Deep Agents Code, or dcode, is an open source coding agent that works with any model + gives your team full control over usage.

In our latest LangChain Academy course, learn how to install + run dcode in a way designed for enterprise teams. academy.langchain.com/courses/dcode-…

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.@CopilotKit is sponsoring Interrupt NYC! Stop by their booth during the event and go hands-on with...

LangChain (@LangChain) — Tue, 08 Sep 2026 13:03:02 GMT

.@CopilotKit is sponsoring Interrupt NYC!

Stop by their booth during the event and go hands-on with the enterprise-ready frontend stack for agents.

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@CopilotKit Learn more about Interrupt, The Agent Conference by LangChain and RSVP: https://t.co/fPM...

LangChain (@LangChain) — Tue, 08 Sep 2026 13:03:02 GMT

@CopilotKit Learn more about Interrupt, The Agent Conference by LangChain and RSVP: interrupt.langchain.com

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LangSmith for Startups: @raspberry__ai ✅ The agentic platform for fashion. ✅ Works alongside design...

LangChain (@LangChain) — Fri, 04 Sep 2026 19:06:27 GMT

LangSmith for Startups: @raspberry__ai
✅ The agentic platform for fashion. 
✅ Works alongside design teams on their boards and turns plain-English requests into finished renders, tech packs, and campaign imagery in minutes.
✅ Runs the full lifecycle of its LangGraph agent on LangSmith. 

Join Raspberry AI to transform the fashion industry: jobs.ashbyhq.com/raspberry?utm_…

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You won't want to miss this -- @sydneyrunkle with a detailed breakdown of LangChain's MCP revamp and...

LangChain (@LangChain) — Fri, 04 Sep 2026 18:32:43 GMT

You won't want to miss this -- @sydneyrunkle with a detailed breakdown of LangChain's MCP revamp and support for the new, stateless spec!

Sydney Runkle@sydneyrunkle

ICYMI -- yesterday we released support for the new MCP protocol in @LangChain !! what do you need to know?

MCP support is now in the main langchain package! get started with `uv pip install 'langchain[mcp]'`

it's now built on top of FastMCP v4; FastMCP has ergonomic support for all things MCP (clients, servers, and apps). FastMCP handles things like protocol negotiation, tool name conflicts, connection lifecycle, transport specs, auth, and caching!

langchain now supports elicitation (MCP's human in the loop concept) via interrupts!

langchain now supports list_tools caching (so you don't have to re-fetch on every agent run; this was a common pain point for TTFT!)

the new protocol is stateless, which means the  agent <-> server interactions are more efficient, and much more scale-able.

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PSA. We're hiring. https://t.co/xJOcm9utQU

LangChain (@LangChain) — Fri, 04 Sep 2026 17:27:11 GMT

PSA. We're hiring. langchain.com/careers

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An amazing opportunity 👀

LangChain (@LangChain) — Fri, 04 Sep 2026 16:36:53 GMT

An amazing opportunity 👀

Ankush Gola@ankush_gola11

We’re looking for someone to lead SmithDB at LangChain!

SmithDB is the database we’ve built from the ground up to power LangSmith. It’s optimized specifically for the access patterns that emerge when you’re storing and querying enormous volumes of agent traces.

It’s serving production traffic at significant scale with great performance, but it’s still early. The problems we are solving are genuinely fun and very hard: indexing, query execution, compaction, ingestion specifically for agent observability + making all of this fast and cost-efficient at massive scale.

We’re looking for an exceptional engineering leader to take ownership of this critical project. You’re likely a great fit if you’ve built database or distributed systems, led strong engineering teams through technically demanding projects, and have exceptional execution and project management skills.

Apply here or DM me directly: jobs.ashbyhq.com/langchain/d81c…

Learn more about SmithDB here: langchain.com/blog/introduci…

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Clay's agents are running longer and taking more steps. LangSmith's threads feature is how they ke...

LangChain (@LangChain) — Fri, 04 Sep 2026 16:02:50 GMT

Clay's agents are running longer and taking more steps. 

LangSmith's threads feature is how they keep every one traceable.

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Watch the full conversation: https://t.co/JStaVgW9pH

LangChain (@LangChain) — Fri, 04 Sep 2026 16:02:50 GMT

Watch the full conversation: youtube.com/watch?v=cx6_tb…

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📊 We analyzed this information from LangSmith Observability data across billions of agent runs, and...

LangChain (@LangChain) — Fri, 04 Sep 2026 15:01:07 GMT

📊 We analyzed this information from LangSmith Observability data across billions of agent runs, and we're just getting started.

Stay tuned for more LangSmith Signals as we share how devs are building agents, by the numbers.langchain.com/langsmith-plat…B

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New from the LangSmith Signal. Over the last 2 weeks, we looked at which models teams reach for, a...

LangChain (@LangChain) — Fri, 04 Sep 2026 15:01:06 GMT

New from the LangSmith Signal. 

Over the last 2 weeks, we looked at which models teams reach for, and which ones are doing the work.

✅ Reach: gpt-4o-mini was used by 13% of orgs
✅ Work: gpt-4.1-mini sat at 7% of LLM calls
💡 DeepSeek V4 Flash: The only open-weight model to make either list, 2nd in reach at 9%.

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.@RogoAI CEO & Co-Founder @GabeStengel is a headliner at Interrupt New York, The Agent Conferenc...

LangChain (@LangChain) — Fri, 04 Sep 2026 13:02:17 GMT

.@RogoAI CEO & Co-Founder @GabeStengel is a headliner at Interrupt New York, The Agent Conference by LangChain.

See the agenda and get your tickets: https://t.co/IjfeNfCnsm

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🎓 Get started with LangSmith Essentials: https://t.co/iclATIJy7T

LangChain (@LangChain) — Thu, 03 Sep 2026 20:13:03 GMT

🎓 Get started with LangSmith Essentials:academy.langchain.com/courses/quicks…T

LangChain@LangChain

The best orgs have figured out how to ship agents repeatedly, safely, and systematically.

They’ve established a continuous agent development lifecycle:
1️⃣ Build
2️⃣ Test
3️⃣ Deploy
4️⃣ Monitor
...So they can learn from real usage, and iterate quickly

With our free LangChain Academy course, LangSmith Essentials, you’ll explore the entire agent development lifecycle in less than 60 minutes.

Check it out: academy.langchain.com/courses/quicks…

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@hwchase17 For the Pittsburgh meetup, please register here 👉 https://t.co/vHNihaezEj

LangChain (@LangChain) — Thu, 03 Sep 2026 19:46:45 GMT

@hwchase17 For the Pittsburgh meetup, please register here  👉eventbrite.com/e/steel-city-a…j

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ICYMI

LangChain (@LangChain) — Thu, 03 Sep 2026 19:44:14 GMT

ICYMI

Sydney Runkle@sydneyrunkle

we now support the new stateless MCP spec in @LangChain!

we've revamped our entire MCP integration. It now lives in the main langchain package, elicitation works via interrupts, and list endpoints are cacheable.

the new adapter is built on top of FastMCP! FastMCP ships with first class transports, auth, connection management, protocol negotiation, caching, callbacks, and more.

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We have several LangChain-led and community-led meetups coming up! RSVP and bring a friend! 🇸🇪 9/...

LangChain (@LangChain) — Thu, 03 Sep 2026 19:30:06 GMT

We have several LangChain-led and community-led meetups coming up! RSVP and bring a friend!

🇸🇪 9/8 Stockholm
🇺🇸 9/9 Pittsburgh
🇺🇸 9/15 Chicago
🇵🇱 9/15 Warsaw
🇵🇱 9/22 Wrocław
🗽 9/22 NYC
🇫🇷 10/5 Paris (w/ @hwchase17)
🇳🇱 10/6 Amsterdam (w/ Harrison Chase)
🇩🇪 10/27luma.com/langchain://t.co/XExzX12HiT

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See what we cooked up: https://t.co/yXjuEyHUjm

LangChain (@LangChain) — Thu, 03 Sep 2026 18:06:14 GMT

See what we cooked up: langchain.com/blog/agents-th…

Nevermined@Nevermined_ai

1/10 Agentic commerce has a missing layer.
Giving an AI agent permission to pay is not the same as knowing whether that payment was worth making.
That’s why we’re partnering with @LangChain.

🧵

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New cookbook with @Nevermined_AI: ✅ Let your agents pay for what they need mid-task, no human requir...

LangChain (@LangChain) — Thu, 03 Sep 2026 18:02:51 GMT

New cookbook with @Nevermined_AI:
✅ Let your agents pay for what they need mid-task, no human required
✅ Delegate your card, and set limits
✅ Let your agent buy credits, top itself up, and pay for the tools it uses
✅ Every purchase, traceable in LangSmith

Learn more: langchain.com/blog/agents-th…

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Today, we're making some exciting updates to MCP in LangChain, including support for the new statele...

LangChain (@LangChain) — Thu, 03 Sep 2026 17:23:41 GMT

Today, we're making some exciting updates to MCP in LangChain, including support for the new stateless MCP spec! 

@SydneyRunkle with everything you need to know ⤵️

Sydney Runkle@sydneyrunkle

x.com/i/article/2095…

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