Problemsby GlyphLangChain agents loop, stall or fail midway
5 posts from 5 people5d activeFading, +0 this week
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The posts behind it
Local formal check for LangGraph-style routing/retry graphs (k-CNF + #F counts) - looking for builder feedback
...flows: SharpLogic.. Maps routing + retry graphs to k-CNF, then counts deadlock / failing (#F) paths with a Rust core. Python AgentGuard hook + CLI so you can gate a graph before you ship it. Demo is a 20-var case (2^20 states); checks are ~microseconds offline.. Not selling "we...
For those building with LangGraph: what do your actual workflows and tech stacks look like?
...tool calls, failed executions, incorrect decisions, expensive runs, state problems, or issues with long-running workflows.. 5. What information do you wish you could see when something goes wrong? . I'd especially appreciate real examples of how your application works and which...
[BUG] log_spans holds every stored span of a trace in memory on each span export that carries token usage
> [!WARNING] > Before submitting a PR, please make sure that: > - A maintainer has triaged this issue and applied the `ready` label > - This issue has no assignee > - No duplicate PR exists > > PRs not meeting these requirements may be automatically closed. ### Issues Policy...
Multi-agent systems have no real communication substrate
...framework primitives (LangGraph, CrewAI, AutoGen): They create framework lock-in and fail to scale. Frameworks relying on monolithic shared state force complete context passing on every step. For long-running tasks or conversational features spanning thousands of turns, this...
bug(langchain): create_agent ends the loop on an invalid structured-output call when an ordinary tool call is in the same batch (no retry feedback)
### Submission checklist - [x] This is a bug, not a usage question. - [x] I added a clear and descriptive title that summarizes this issue. - [x] I used the GitHub search to find a similar question and didn't find it. - [x] I am sure that this is a bug in LangChain rather than...
Companies and products named
About this problem
Evidence
5 posts from 5 people in 4 places, about 1 a week over 46 days. Mostly on r/LangChain, langchain-ai/langchain, r/mlops. Tools named alongside: OpenAI, Anthropic, CrewAI, GitHub.
Frustration Frustration 0 of 3· Seen on Reddit, GitHub issues
How it was grouped
Posts that state a pain and match the "agent-reliability" rule about LangChain. First post Sep 12, 2026, latest Oct 27, 2026. Corroborated: 3 or more posts from 2 or more people or places. Method
The same problem elsewhere
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GitHub Copilot agents loop, stall or fail midway
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Kubernetes agents loop, stall or fail midway
2 posts from 2 people on DEV, GitHub issues. Unverified.
Anthropic agents loop, stall or fail midway
2 posts from 2 people on GitHub issues. Unverified.
Gemini agents loop, stall or fail midway
2 posts from 2 people on GitHub issues. Unverified.
OpenAI agents loop, stall or fail midway
2 posts from 2 people on GitHub issues, Reddit. Unverified.
Ollama agents loop, stall or fail midway
2 posts from 2 people on Reddit, GitHub issues. Unverified.
Mistral agents loop, stall or fail midway
2 posts from 2 people on GitHub issues. Unverified.
Other LangChain problems
LangChain users keep filing bugs
Top post: "langchain 1.4.0: any after_model middleware using documented `jump_to=tools` bypasses the HITL", one of 27 posts from 23 people on GitHub issues, Reddit.
LangChain upgrades break working setups
10 posts from 10 people on GitHub issues, Reddit.
Trouble with LangChain agent
Top post: "langchain-classic: importing a moved agent from `agent_toolkits` raises `ValueError` instead of `ImportError`", one of 8 posts from 7 people on GitHub issues, Reddit, Stack Overflow.
RAG on LangChain returns irrelevant or missing context
8 posts from 7 people on Reddit, GitHub issues, Stack Overflow.
LangChain rate limits and usage caps block work
4 posts from 3 people on GitHub issues.
Trouble with LangChain test
Top post: "langchain: MCP adapter test asserts a POSIX-only error message, fails on Windows where the drive letter", one of 4 posts from 4 people on GitHub issues.
Trouble with LangChain agents
Top post: "Is it normal for a LangGraph supervisor to consume as many tokens as all 8 agents combined? How can we", one of 4 posts from 4 people on Reddit.
LangChain error messages are cryptic
3 posts from 2 people on GitHub issues.
LangChain vulnerabilities are hard to triage and patch
3 posts from 1 person on GitHub issues. Unverified.
Prompt injection makes LangChain features unsafe
3 posts from 2 people on Reddit, GitHub issues.
Trouble with LangChain instead
Top post: "How to force langchain model to use my language instead of English", one of 2 posts from 2 people on GitHub issues, Stack Overflow. Unverified.
Trouble with LangChain valueerror
Top post: "core: check_valid_template raises ValueError for mustache template_format", one of 2 posts from 2 people on GitHub issues. Unverified.
History