langgraph

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Sydney RunkleandClaude Sonnet 4.6 6c35d4e97b perf(add_messages): skip left-side conversion and fast-path pure appends

Two optimizations for the hot path in add_messages, which is called on
every write to a messages channel:

1. Skip conversion of left: when left is already list[BaseMessage] with
   IDs assigned (true for every call after the first), skip
   convert_to_messages + message_chunk_to_message + the ID-None loop.
   These are O(n) no-ops on already-resolved messages that allocate two
   intermediate lists.

2. Pure-append short-circuit: when right contains no RemoveMessage and
   no ID overlaps with left, return left + right directly. Replaces the
   O(n) copy + dict build + filter with a single set-membership check.

Benchmarks (median of 2000 iterations, pure-append scenario):
  10-msg thread:   2.9x faster
  100-msg thread:  6.6x faster
  1000-msg thread: 7.3x faster
  200-step simulation (2 msgs/step): 3.4x faster end-to-end

Also adds tests/test_add_messages_benchmark.py with correctness tests
for all scenarios (append, update, remove) and a runnable benchmark.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-04-24 07:31:03 -04:00

checkpoint

refactor(delta-channel): honest data model, private experimental API

2026-04-23 14:15:02 -04:00

checkpoint-conformance

chore(deps): bump langsmith from 0.7.3 to 0.7.31 in /libs/checkpoint-conformance (#7523 )

2026-04-15 19:36:27 -07:00

checkpoint-postgres

internal for now

2026-04-24 07:29:52 -04:00

checkpoint-sqlite

chore(deps): bump langsmith from 0.6.4 to 0.7.31 in /libs/checkpoint-sqlite (#7524 )