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langchain #34742

feat(langchain): Only Keeping the last todo message

by keenborder786 · Feb 06, 2026 at 19:29 UTC · scan-46931a8d64576b7c

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High Risk (50%)

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Risk Assessment

Risk level: High (50%)

Risk Drivers

  • large_diff: Large change: 747 lines modified
  • api_surface_change: API surface changed in 2 file(s)

Intent

2/2 criteria met

Allow keeping only the last todo message in LLM call context.

Acceptance Criteria

  • ✓
    User can decide to keep only the last todo message.

    Changes in todo.py allow altering how todo messages are retained.

  • ✓
    Tests cover the new functionality.

    test_todo.py modified with significant additions to test retaining of last todo message.

Confidence: 95.0% Source: pr description AI: openai

Contributors

keenborder786 PR Author 16 commits ~ Established
Account Age: 2634 days
Prior PRs: 163
Merged: 89

Established contributor with 89 merged PRs. maintains 101 public repositories. unfamiliar with 2 files.

Evidence

Evidence Completeness: 80.0%
ci_passing Passing
tests_passing Passing
build_successful Passing
lint_passing Passing
Missing: security_scan_clean, coverage_maintained

Supply Chain

None Risk
Modifies dependencies
Modifies lockfile
Modifies CI config
Modifies build scripts

Focus Files

Review 2 high-priority file(s)

libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_todo.py +668

668 lines changed; Source code

high
libs/langchain_v1/langchain/agents/middleware/todo.py +79

79 lines changed; Source code

high

Triage

83

minutes to review

high

effort level

none

staleness risk

Allocate focused review time

Recommendation

COMMENT 67.0% readiness

Some concerns to address before approval

Next Steps

Concern

Consider breaking into smaller PRs

Question

Why is security_scan_clean missing? Consider adding this check.

Question

Why is coverage_maintained missing? Consider adding this check.