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[PR #6736] fix(langgraph): Compile-time Detection of Detached Nodes #5251

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opened 2026-02-20 17:51:26 -05:00 by yindo · 0 comments
yindo commented 2026-02-20 17:51:26 -05:00
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Original Pull Request: https://github.com/langchain-ai/langgraph/pull/6736

State: open
Merged: No

  • Description: Introduce optional validation to warn or raise an exception on detached nodes. These are either unreachable or dead-ends not explicitly mapping to END. When developers specify the routing of their nodes, or that routing can be inferred from the node spec, it's used to detect detached nodes and handle it so that these don't go unnoticed. For developers that don't wish to specify the routing of the nodes (e.g., when routing by Command or conditional edges), they could set on_detached_nodes="ignore" to disable the node validation. Default would be "warn". Changes are backwards compatible.

  • Issue: https://github.com/langchain-ai/langgraph/issues/6735

  • Dependencies: N/A.

  • LinkedIn handle: linkedin.com/in/faroukb

**Original Pull Request:** https://github.com/langchain-ai/langgraph/pull/6736 **State:** open **Merged:** No --- - **Description:** Introduce optional validation to `warn` or `raise` an exception on detached nodes. These are either **unreachable** or **dead-ends** not explicitly mapping to `END`. When developers specify the routing of their nodes, or that routing can be inferred from the node spec, it's used to detect detached nodes and handle it so that these don't go unnoticed. For developers that don't wish to specify the routing of the nodes (e.g., when routing by `Command` or conditional edges), they could set `on_detached_nodes="ignore"` to disable the node validation. Default would be `"warn"`. **Changes are backwards compatible.** - **Issue:** https://github.com/langchain-ai/langgraph/issues/6735 - **Dependencies:** N/A. - **LinkedIn handle:** linkedin.com/in/faroukb
yindo added the pull-request label 2026-02-20 17:51:26 -05:00
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Reference: langchain-ai/langgraph#5251
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