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feat(langgraph): add __repr__ methods to all channel classes for better debugging#7083

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Charan Karnati (Charank18) wants to merge 1 commit intolangchain-ai:mainfrom
Charank18:fix/channel-repr-methods
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feat(langgraph): add __repr__ methods to all channel classes for better debugging#7083
Charan Karnati (Charank18) wants to merge 1 commit intolangchain-ai:mainfrom
Charank18:fix/channel-repr-methods

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@Charank18 Charan Karnati (Charank18) commented Mar 9, 2026

This PR adds human-readable repr methods to all 9 channel classes in libs/langgraph/langgraph/channels/. Currently, debugging channel state requires manually inspecting attributes. With these changes, repr(channel) now shows key information at a glance:

  • LastValue / LastValueAfterFinish: shows typ, key, value (or MISSING), and finished flag
  • EphemeralValue / UntrackedValue: shows typ, key, guard, and value
  • AnyValue: shows typ, key, and value
  • Topic: shows typ, key, accumulate, and current length
  • BinaryOperatorAggregate: shows typ, key, operator name, and value
  • NamedBarrierValue / NamedBarrierValueAfterFinish: shows key, names, seen, and finished flag

Example: LastValue(typ=<class 'int'>, key='counter', value=42)

@Charank18
feat(langgraph): add __repr__ methods to all channel classes
48785ff 
Add human-readable __repr__ to all channel classes for better debugging:
- LastValue, LastValueAfterFinish
- EphemeralValue
- Topic
- BinaryOperatorAggregate
- AnyValue
- UntrackedValue
- NamedBarrierValue, NamedBarrierValueAfterFinish

Each repr shows the channel's type, key, and current value state,
making it easier to inspect channel state during development.
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