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langchain - ✅(Solved) Fix core, anthropic: bare raise ValueError provides no debugging context [2 pull requests, 1 comments, 2 participants]

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langchain-ai/langchain#35727•Fetched 2026-04-08 00:24:52
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alvinttangalvinttang
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ajbermudezh22ajbermudezh22alvinttangalvinttang
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Error Message

Several locations use bare raise ValueError without an error message, making it hard for users to understand what went wrong. Add descriptive error messages to each raise ValueError describing the condition that triggered it. No functional behavior change.

Fix Action

Fixed

PR fix notes

PR #35730: fix(core,anthropic): add descriptive messages to bare raise ValueError

Description (problem / solution / changelog)

Fixes #35727

Add descriptive error messages to bare raise ValueError statements. Bare raises provide no context for debugging, making it hard for users to understand what went wrong.

Changed files

  • libs/core/langchain_core/prompts/few_shot_with_templates.py — missing examples/example_selector
  • libs/core/langchain_core/prompts/loading.py — unsupported template file format
  • libs/core/langchain_core/document_loaders/langsmith.py — conflicting client args
  • libs/partners/anthropic/langchain_anthropic/middleware/file_search.py — malformed brace expansion

No functional behavior change.

Changed files

  • libs/core/langchain_core/document_loaders/langsmith.py (modified, +5/-1)
  • libs/core/langchain_core/prompts/few_shot_with_templates.py (modified, +4/-2)
  • libs/core/langchain_core/prompts/loading.py (modified, +5/-1)
  • libs/partners/anthropic/langchain_anthropic/middleware/file_search.py (modified, +4/-2)

PR #35761: fix: add descriptive error messages to bare ValueError raises

Description (problem / solution / changelog)

Summary

Add meaningful error messages to bare raise ValueError statements across multiple files to improve debugging experience for users.

Changes

  • few_shot_with_templates.py: Add message for missing examples/selector
  • loading.py: Add message for unsupported template file format
  • langsmith.py: Add message for conflicting client args
  • file_search.py: Add messages for malformed brace expansion

Files Changed

  • libs/core/langchain_core/prompts/few_shot_with_templates.py
  • libs/core/langchain_core/prompts/loading.py
  • libs/core/langchain_core/document_loaders/langsmith.py
  • libs/partners/anthropic/langchain_anthropic/middleware/file_search.py

Fixes: langchain-ai/langchain#35727

Changed files

  • libs/core/langchain_core/document_loaders/langsmith.py (modified, +1/-1)
  • libs/core/langchain_core/prompts/few_shot_with_templates.py (modified, +2/-2)
  • libs/core/langchain_core/prompts/loading.py (modified, +1/-1)
  • libs/partners/anthropic/langchain_anthropic/middleware/file_search.py (modified, +2/-2)
RAW_BUFFERClick to expand / collapse

Description

Several locations use bare raise ValueError without an error message, making it hard for users to understand what went wrong.

Affected files

  • libs/core/langchain_core/prompts/few_shot_with_templates.py — missing examples/example_selector
  • libs/core/langchain_core/prompts/loading.py — unsupported template file format
  • libs/core/langchain_core/document_loaders/langsmith.py — conflicting client args
  • libs/partners/anthropic/langchain_anthropic/middleware/file_search.py — malformed brace expansion

Suggested fix Add descriptive error messages to each raise ValueError describing the condition that triggered it. No functional behavior change.

extent analysis

Fix: Add Descriptive Error Messages

Fix Plan

Step 1: Identify raise ValueError Statements

  • Review the affected files and identify all raise ValueError statements.
  • Ensure you understand the context and condition that triggers each error.

Step 2: Add Descriptive Error Messages

  • For each raise ValueError statement, add a descriptive error message that explains the condition that triggered it.
  • Use a string argument to pass the error message to the ValueError constructor.

Example code snippets:

# Before
raise ValueError

# After
raise ValueError("Unsupported template file format")
# Before
raise ValueError

# After
raise ValueError("Malformed brace expansion")
# Before
raise ValueError

# After
raise ValueError("Conflicting client arguments")

Step 3: Update Affected Files

  • Apply the changes to each affected file, adding descriptive error messages to the raise ValueError statements.

Verification

  • Review the updated code to ensure that descriptive error messages are added to each raise ValueError statement.
  • Test the code to verify that the error messages are displayed correctly when the corresponding conditions are triggered.

Extra Tips

  • Use a consistent error message format throughout the codebase.
  • Consider using a custom exception class instead of ValueError to provide more context and flexibility.
  • Regularly review and update error messages to ensure they remain accurate and helpful.

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langchain - ✅(Solved) Fix core, anthropic: bare raise ValueError provides no debugging context [2 pull requests, 1 comments, 2 participants]