Issues

• ollama: ChatOllama sends tool results without tool_name, so models see them as an unknown tool

  bugexternalollama
  Bug

  langchain-ai/langchain#41085 · Filter by author roydonsequeira opened on Oct 6, 2026
  2

• langchain-classic: importing a moved agent from agent_toolkits raises ValueError instead of ImportError

  bugexternallangchain-classic
  Bug

  langchain-ai/langchain#41066 · Filter by author imsoumya18 opened on Oct 6, 2026
  2

• core: docstring examples import from nonexistent modules (output_parser, runnable, documents.Blob)

  bugcoreexternal
  Bug

  langchain-ai/langchain#41064 · Filter by author gerardrecinto opened on Oct 6, 2026
  1

• Add SiaMesh x402 Secure Scraper Tool

  externalfeature request
  Feature

  langchain-ai/langchain#41060 · Filter by author Serk-Han opened on Oct 5, 2026

• @wrap_tool_call loses custom ContextT and becomes incompatible with create_agent(context_schema=...)

  bugexternallangchain
  Bug

  langchain-ai/langchain#41051 · Filter by author Frajdi opened on Oct 5, 2026
  2

• [Feature] Security Docs: Add Runtime Security Middleware for Agents (Prompt/Command Injection)

  coreexternalfeature requestlangchain
  Feature

  langchain-ai/langchain#41029 · Filter by author pratikkmishra02-gif opened on Oct 3, 2026
  4

• docs(langchain): CodexSandboxExecutionPolicy docstring attributes macOS Seatbelt to Anthropic

  bugexternallangchain
  Bug

  langchain-ai/langchain#41028 · Filter by author sauravsolanki opened on Oct 3, 2026
  3

• PIIMiddleware url detector redacts version numbers, ratios and dotted identifiers ("Node.js/Express", "1.5/2.0", "python3.12/site-packages") as URLs

  bugexternallangchain
  Bug

  langchain-ai/langchain#41027 · Filter by author sauravsolanki opened on Oct 3, 2026
  3

• FilesystemFileSearchMiddleware: grep_search swallows ripgrep errors and reports "No matches found"; Python fallback never runs and max_file_size_mb is ignored on the ripgrep path

  bugexternallangchain
  Bug

  langchain-ai/langchain#41026 · Filter by author sauravsolanki opened on Oct 3, 2026
  5

• ModelRetryMiddleware / ToolRetryMiddleware: retry_on=SomeError (a bare class) retries every exception

  bugcoreexternallangchain
  Bug

  langchain-ai/langchain#41025 · Filter by author sauravsolanki opened on Oct 3, 2026
  3

• core: convert_to_openai_messages raises KeyError: 'type' for any content block without a type key

  bugcoreexternal
  Bug

  langchain-ai/langchain#41021 · Filter by author kodurd opened on Oct 3, 2026
  4

• nomic: NomicEmbeddings.embed_image raises a bare AssertionError unless vision_model is set, and vision_model is rejected by type checkers

  bugexternalnomic
  Bug

  langchain-ai/langchain#41020 · Filter by author kodurd opened on Oct 3, 2026
  4

• feat(fireworks): surface LangSmith gateway metadata on successful responses

  externalfeature requestfireworks
  Feature

  langchain-ai/langchain#41016 · Filter by author aminesbdev opened on Oct 3, 2026
  3

• langchain-core: is_data_content_block recomputes the block types on every call, ~23ms per ChatOpenAI payload

  bugcoreexternal
  Bug

  langchain-ai/langchain#41010 · Filter by author zdurm opened on Oct 2, 2026
  3

• HumanInTheLoopMiddleware: opt-in per-call interrupts with typed response_schema

  internallangchain
  Feature

  langchain-ai/langchain#41007 · Filter by author byhow opened on Oct 2, 2026
  4

  

• v3 streaming: tool-call block-delta events are snapshots, so their size grows quadratically with the tool-call arguments

  bugcoreexternal
  Bug

  langchain-ai/langchain#40999 · Filter by author Nicolas-Ding opened on Oct 2, 2026
  3

• ModelFallbackMiddleware strips cache_control when falling back to ChatAnthropicMantle

  bugexternallangchain
  Bug

  langchain-ai/langchain#40996 · Filter by author jeon-jihyeon opened on Oct 2, 2026
  4

• langchain-openai: OpenAI() defaults to gpt-3.5-turbo-instruct (shut down Sep 28) and ChatOpenAI() to gpt-3.5-turbo (shuts down Oct 23)

  bugexternalopenai
  Bug

  langchain-ai/langchain#40995 · Filter by author 23821 opened on Oct 2, 2026
  1

• feat(callbacks): In-memory Zero-Trust Data Sanitization (ZTDS) callback (IETF draft-02)

  coreexternalfeature request
  Feature

  langchain-ai/langchain#40984 · Filter by author moxno opened on Oct 1, 2026

• Two type contracts allow values that the implementations cannot handle or do not return as declared.

  bugcoreexternal
  Bug

  langchain-ai/langchain#40977 · Filter by author AGFACBNNR opened on Oct 1, 2026
  3

• ExperimentalMarkdownSyntaxTextSplitter closes code blocks on shorter or mismatched fences

  bugexternaltext-splitters
  Bug

  langchain-ai/langchain#40967 · Filter by author lilyyang1014 opened on Oct 1, 2026
  3

• XMLOutputParser streaming drops valid Unicode root tags

  bugcoreexternal
  Bug

  langchain-ai/langchain#40965 · Filter by author Marcuswang0824 opened on Oct 1, 2026
  4

• langchain.mcp: support bounded same-call 401 recovery with externally managed credentials

  internal
  langchain-ai/langchain#40936 · Filter by author open-swe opened on Sep 30, 2026
  1

• core: Tee leaves its source open when a child is never started

  bugcoreexternal
  Bug

  langchain-ai/langchain#40935 · Filter by author michaelswissa opened on Sep 30, 2026
  2

• langchain-typesafe: ClassifierResponse has no request id or cost when the classifier is routed through OpenRouter

  externalfeature requesttypesafe
  Feature

  langchain-ai/langchain#40934 · Filter by author mbn18 opened on Sep 30, 2026
  5