# Fleet **URL:** https://forum.langchain.com/c/help/fleet/17.md [Latest](https://forum.langchain.com/latest.md) · [Categories](https://forum.langchain.com/categories.md) · [Tags](https://forum.langchain.com/tags.md) --- ## [About the Fleet category](https://forum.langchain.com/t/about-the-fleet-category/2410)
**Author:** [@amada-langchain](https://forum.langchain.com/u/amada-langchain)\ **Replies:** 1\ **Last updated:** [January 21, 2026, 8:48pm UTC](https://forum.langchain.com/t/about-the-fleet-category/2410 "2026-01-21T20:48:51Z")
Questions, issues, and/or discussions regarding LangSmith Fleet. --- ## [Query pay-as-you-go option on developer plan](https://forum.langchain.com/t/query-pay-as-you-go-option-on-developer-plan/4309)
**Author:** [@9958](https://forum.langchain.com/u/9958)\ **Replies:** 2\ **Last updated:** [August 9, 2026, 9:00pm UTC](https://forum.langchain.com/t/query-pay-as-you-go-option-on-developer-plan/4309 "2026-08-09T21:00:11Z")
Hi, I am new to all this and have just started creating my agent on the developer option. I have hit the 5 LCU limit and looking at the developer plan again you can then select pay-as-you-go. I would assume then that I s… --- ## [I'm getting a "RateLimitError: An internal error occurred at async handler" error](https://forum.langchain.com/t/im-getting-a-ratelimiterror-an-internal-error-occurred-at-async-handler-error/3966)
**Author:** [@AmineAouragh](https://forum.langchain.com/u/AmineAouragh)\ **Replies:** 7\ **Last updated:** [June 18, 2026, 11:54am UTC](https://forum.langchain.com/t/im-getting-a-ratelimiterror-an-internal-error-occurred-at-async-handler-error/3966 "2026-06-18T11:54:15Z")
I’m invoking my Fleet agent from my React code through the Langsmith SDK and I’m getting a “RateLimitError: An internal error occurred at async handler” error. The error is highlighting this line from my code specifical… --- ## [Google Sheets MCP Tool returning 404 errors](https://forum.langchain.com/t/google-sheets-mcp-tool-returning-404-errors/2873)
**Author:** [@lkfrota](https://forum.langchain.com/u/lkfrota)\ **Replies:** 5\ **Last updated:** [May 25, 2026, 10:44pm UTC](https://forum.langchain.com/t/google-sheets-mcp-tool-returning-404-errors/2873 "2026-05-25T22:44:17Z")
I am using the hosted Agent Builder and trying to use the google\_sheets\_get\_spreadsheet and read\_range tools. I am consistently getting 404 Requested entity was not found errors, even though: The Spreadsheet exists an… --- ## [I try to invoke my fleet agent but seems like my Next.js code can't read my api\_key environment variable so i get 401 unauthenticated error](https://forum.langchain.com/t/i-try-to-invoke-my-fleet-agent-but-seems-like-my-next-js-code-cant-read-my-api-key-environment-variable-so-i-get-401-unauthenticated-error/3741)
**Author:** [@AmineAouragh](https://forum.langchain.com/u/AmineAouragh)\ **Replies:** 7\ **Last updated:** [May 21, 2026, 5:30pm UTC](https://forum.langchain.com/t/i-try-to-invoke-my-fleet-agent-but-seems-like-my-next-js-code-cant-read-my-api-key-environment-variable-so-i-get-401-unauthenticated-error/3741 "2026-05-21T17:30:00Z")
i’m trying to invoke my Fleet agent from my website but i always get an “unauthenticated” HTTP 401 error even if my langgraph\_api\_key, agent\_id and api\_url are all correctly set as env variables in my .env.local file i’… --- ## [Connecting the Slack integration fails with invalid\_team\_for\_non\_distributed\_app](https://forum.langchain.com/t/connecting-the-slack-integration-fails-with-invalid-team-for-non-distributed-app/3643)
**Author:** [@ailtir-langsmith](https://forum.langchain.com/u/ailtir-langsmith)\ **Replies:** 7\ **Last updated:** [May 5, 2026, 3:27pm UTC](https://forum.langchain.com/t/connecting-the-slack-integration-fails-with-invalid-team-for-non-distributed-app/3643 "2026-05-05T15:27:23Z")
Hi All. The langchain-fleet Slack Bot needs to be configured as ‘Publicly Distributed’ (see example above). - RT --- ## [Using custom MCP servers with assistants](https://forum.langchain.com/t/using-custom-mcp-servers-with-assistants/3651)
**Author:** [@ailtir-langsmith](https://forum.langchain.com/u/ailtir-langsmith)\ **Replies:** 2\ **Last updated:** [May 5, 2026, 3:25pm UTC](https://forum.langchain.com/t/using-custom-mcp-servers-with-assistants/3651 "2026-05-05T15:25:46Z")
Hi All, I am using an assistant agent. Obviously the tools/MCP-servers need to run-with/use the id of the assistant. Means when langsmith starts/connects-to the (remote) MCP servers there must be a way to pass the auth … --- ## [Gmail MCP Error -32603: Tool execution failed](https://forum.langchain.com/t/gmail-mcp-error-32603-tool-execution-failed/3331)
**Author:** [@wanyingq](https://forum.langchain.com/u/wanyingq)\ **Replies:** 1\ **Last updated:** [April 15, 2026, 3:48pm UTC](https://forum.langchain.com/t/gmail-mcp-error-32603-tool-execution-failed/3331 "2026-04-15T15:48:01Z")
4/6/2026 update: The problem fixed itself today when I rerun. Thank you. Below is the original post: I receive many newsletter subscriptions that I don’t have time to read. To manage this, I created an agent in Fl… --- ## [Python Invocation of Agent - Inbox Edit Files, not the expected response](https://forum.langchain.com/t/python-invocation-of-agent-inbox-edit-files-not-the-expected-response/3322)
**Author:** [@Btibert3](https://forum.langchain.com/u/Btibert3)\ **Replies:** 2\ **Last updated:** [April 10, 2026, 8:21pm UTC](https://forum.langchain.com/t/python-invocation-of-agent-inbox-edit-files-not-the-expected-response/3322 "2026-04-10T20:21:59Z")
To set the stage, I am only starting to poke around Fleet. I created an Agent in the interface, and then invoked it via Python, twice. When inspecting the output, there were two messages, and the last was not an answer… --- ## [Created an awesome agent using the agent builder, what's next?](https://forum.langchain.com/t/created-an-awesome-agent-using-the-agent-builder-whats-next/2828)
**Author:** [@yonish3](https://forum.langchain.com/u/yonish3)\ **Replies:** 1\ **Last updated:** [April 3, 2026, 11:14pm UTC](https://forum.langchain.com/t/created-an-awesome-agent-using-the-agent-builder-whats-next/2828 "2026-04-03T23:14:03Z")
I created an agent using the agent builder. Is it production ready? Can I integrate it in my web app? The support docs bot suggested I need to download and deploy it using an agent server? but I could not find a way to… --- ## [Fleet and Langmsith - No output in the Trace](https://forum.langchain.com/t/fleet-and-langmsith-no-output-in-the-trace/3321)
**Author:** [@Btibert3](https://forum.langchain.com/u/Btibert3)\ **Replies:** 2\ **Last updated:** [April 3, 2026, 10:29pm UTC](https://forum.langchain.com/t/fleet-and-langmsith-no-output-in-the-trace/3321 "2026-04-03T22:29:35Z")
I just started playing around with Fleet, specifically, the agent builder. I did not use a template, and wanted to test out the manual build within the interface. I created a painfully simple agent and included API key… --- ## [HITL: Rejecting one action rejects entire interrupt batch?](https://forum.langchain.com/t/hitl-rejecting-one-action-rejects-entire-interrupt-batch/3047)
**Author:** [@elozano98](https://forum.langchain.com/u/elozano98)\ **Replies:** 2\ **Last updated:** [February 27, 2026, 8:46pm UTC](https://forum.langchain.com/t/hitl-rejecting-one-action-rejects-entire-interrupt-batch/3047 "2026-02-27T20:46:19Z")
I’m using LangChain’s built-in HITL middleware and noticed that when multiple actions are grouped in a single interrupt, rejecting just one action causes the entire batch to be rejected. Is this the intended behavior? I… --- ## [Customizing Agent behavior + trigger on email not working](https://forum.langchain.com/t/customizing-agent-behavior-trigger-on-email-not-working/2832)
**Author:** [@ddewaele](https://forum.langchain.com/u/ddewaele)\ **Replies:** 1\ **Last updated:** [February 2, 2026, 2:09pm UTC](https://forum.langchain.com/t/customizing-agent-behavior-trigger-on-email-not-working/2832 "2026-02-02T14:09:22Z")
I started playing with Agent builder and the Email Template in particular. I’ve setup the gmail connection and noticed that whenever it uses the gmail\_send\_email tool it always asks for user input (human in the loop). T… --- ## [Resquested tools/access, how to get them?](https://forum.langchain.com/t/resquested-tools-access-how-to-get-them/2847)
**Author:** [@cucfkpoesie](https://forum.langchain.com/u/cucfkpoesie)\ **Replies:** 0\ **Last updated:** [January 31, 2026, 8:50pm UTC](https://forum.langchain.com/t/resquested-tools-access-how-to-get-them/2847 "2026-01-31T20:50:05Z")
Hey there, I built an agent with natural language. It’s supposed to search trends in web searches and social media, write articles about what’s trending and then post them on a wordpress installation. However, it doesn’… --- ## [How to allow others to use the agent built with langsmith agent builder?](https://forum.langchain.com/t/how-to-allow-others-to-use-the-agent-built-with-langsmith-agent-builder/2399)
**Author:** [@valtahomes](https://forum.langchain.com/u/valtahomes)\ **Replies:** 2\ **Last updated:** [January 28, 2026, 5:57am UTC](https://forum.langchain.com/t/how-to-allow-others-to-use-the-agent-built-with-langsmith-agent-builder/2399 "2026-01-28T05:57:52Z")
Just saw the agent builder. It is great tool. One quick question: how do I expose the agent i built in the builder to other users? is there an API endpoint that i could deploy the agent built to other web sites? or do i… --- ## [403 forbiddne on threads](https://forum.langchain.com/t/403-forbiddne-on-threads/2773)
**Author:** [@chinu0609](https://forum.langchain.com/u/chinu0609)\ **Replies:** 0\ **Last updated:** [January 22, 2026, 5:51am UTC](https://forum.langchain.com/t/403-forbiddne-on-threads/2773 "2026-01-22T05:51:29Z")
The agent is created using agent builder and has some api url xxlanggraph.app but when i use the langsmith api key and curl it for auth it says 200 ok but when calling threads endpoint it says forbidden curl -I ‘https:/… --- ## [Time Checkpoint memory backend for LangGraph: restart continuity + SHA receipts (private eval)](https://forum.langchain.com/t/time-checkpoint-memory-backend-for-langgraph-restart-continuity-sha-receipts-private-eval/2662)
**Author:** [@Empire.Tech](https://forum.langchain.com/u/Empire.Tech)\ **Replies:** 0\ **Last updated:** [January 5, 2026, 1:48am UTC](https://forum.langchain.com/t/time-checkpoint-memory-backend-for-langgraph-restart-continuity-sha-receipts-private-eval/2662 "2026-01-05T01:48:19Z")
Hi LangChain community, LangChain Support suggested I share this here to route it to the right place. I’ve built a standalone Time Checkpoint / Memory Folding Engine demo that behaves like an agent-memory backend with: …