agents/graphs/auto_debug: Node functions _analyze_error, _generate_fix, _validate_fix mutate state in-place violating LangGraph node contract #10496

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opened 2026-04-18 10:11:30 +00:00 by HAL9000 · 4 comments
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Metadata

  • Commit: fix(agents/graphs/auto_debug): return update dicts from node functions instead of mutating state in-place
  • Branch: fix/auto-debug-node-return-update-dicts

Background and Context

AutoDebugAgent node functions (_analyze_error, _generate_fix, _validate_fix) mutate the input state dict in-place and return the full state object. This violates the LangGraph node contract, which requires node functions to return a dict of state updates (only changed keys). This can cause duplicate state entries and incorrect behavior when LangGraph merges state updates.

Expected Behavior

All three node functions should return a dict containing only the keys that changed, without mutating the input state object. This is consistent with the correct pattern already used in context_analysis.py and plan_generation.py.

Acceptance Criteria

  • _analyze_error returns {"messages": state.get("messages", []) + [new_message]} without mutating state
  • _generate_fix returns {"current_fix": fix_data} without mutating state
  • _validate_fix returns {"fix_validated": is_valid} (plus "attempted_fixes" when invalid) without mutating state
  • All three functions have return type annotation dict[str, Any] instead of AutoDebugState
  • The TDD test from #10494 passes (flips from expected-fail to real pass)
  • No regressions in existing AutoDebugAgent tests

Subtasks

  • Fix _analyze_error to return update dict
  • Fix _generate_fix to return update dict
  • Fix _validate_fix to return update dict
  • Update return type annotations on all three functions
  • Verify TDD test from #10494 now passes
  • Run full test suite and confirm no regressions

Definition of Done

The issue is closed when all three node functions return update dicts, the TDD test from #10494 passes, and CI is green.


Bug Report

Summary

AutoDebugAgent node functions (_analyze_error, _generate_fix, _validate_fix) mutate the input state dict in-place and return the full state object. This violates the LangGraph node contract, which requires node functions to return a dict of state updates (only changed keys). This can cause duplicate state entries and incorrect behavior when LangGraph merges state updates.

Affected File

src/cleveragents/agents/graphs/auto_debug.py

Code Evidence

_analyze_error (lines ~90-115):

def _analyze_error(self, state: AutoDebugState) -> AutoDebugState:
    # ...
    state.setdefault("messages", []).append(  # BUG: in-place mutation
        {
            "role": "assistant",
            "content": analysis,
            "type": "error_analysis",
        }
    )
    return state  # BUG: returns full state, not update dict

_generate_fix (lines ~117-175):

def _generate_fix(self, state: AutoDebugState) -> AutoDebugState:
    # ...
    state["current_fix"] = fix_data  # BUG: in-place mutation
    return state  # BUG: returns full state

_validate_fix (lines ~177-225):

def _validate_fix(self, state: AutoDebugState) -> AutoDebugState:
    # ...
    state["fix_validated"] = is_valid  # BUG: in-place mutation
    if not is_valid:
        attempted_fixes = state.get("attempted_fixes", [])
        attempted_fixes.append(current_fix)
        state["attempted_fixes"] = attempted_fixes  # BUG: in-place mutation
    return state  # BUG: returns full state

Contrast with Correct Pattern

The context_analysis.py and plan_generation.py agents correctly return update dicts:

# CORRECT pattern (from context_analysis.py):
def _load_files(self, state: ContextAnalysisState) -> dict[str, Any]:
    # ...
    return {
        "documents": documents,
        "error": error_msg,
    }

Impact

  1. Duplicate messages: When LangGraph processes the returned state, it may merge the returned full state with the existing state, causing messages to be duplicated.
  2. Checkpoint inconsistency: LangGraph's checkpointing system tracks state diffs. Returning the full state instead of updates can cause incorrect diffs to be stored.
  3. Inconsistency with other agents: ContextAnalysisAgent and PlanGenerationGraph correctly return update dicts, making AutoDebugAgent inconsistent.

Fix

Return only the changed keys from each node function:

def _analyze_error(self, state: AutoDebugState) -> dict[str, Any]:
    # ...
    new_message = {"role": "assistant", "content": analysis, "type": "error_analysis"}
    return {"messages": state.get("messages", []) + [new_message]}

def _generate_fix(self, state: AutoDebugState) -> dict[str, Any]:
    # ...
    return {"current_fix": fix_data}

def _validate_fix(self, state: AutoDebugState) -> dict[str, Any]:
    # ...
    updates: dict[str, Any] = {"fix_validated": is_valid}
    if not is_valid:
        updates["attempted_fixes"] = state.get("attempted_fixes", []) + [current_fix]
    return updates

Validation Gate

  • Code evidence: state.setdefault(...).append(...) and return state in _analyze_error(), _generate_fix(), _validate_fix() in auto_debug.py
  • Environment verification: Contrast with correct pattern in context_analysis.py
  • Actionability: Return update dicts instead of full state
  • Codebase freshness: Verified in current HEAD
  • Severity match: Critical - violates LangGraph contract, causes state corruption

Blocked By

Depends on TDD issue #10494.


Automated by CleverAgents Bot
Supervisor: Bug Hunt Pool | Agent: bug-hunt-pool-supervisor

## Metadata - **Commit:** `fix(agents/graphs/auto_debug): return update dicts from node functions instead of mutating state in-place` - **Branch:** `fix/auto-debug-node-return-update-dicts` ## Background and Context `AutoDebugAgent` node functions (`_analyze_error`, `_generate_fix`, `_validate_fix`) mutate the input state dict in-place and return the full state object. This violates the LangGraph node contract, which requires node functions to return a dict of state **updates** (only changed keys). This can cause duplicate state entries and incorrect behavior when LangGraph merges state updates. ## Expected Behavior All three node functions should return a dict containing only the keys that changed, without mutating the input state object. This is consistent with the correct pattern already used in `context_analysis.py` and `plan_generation.py`. ## Acceptance Criteria - [ ] `_analyze_error` returns `{"messages": state.get("messages", []) + [new_message]}` without mutating `state` - [ ] `_generate_fix` returns `{"current_fix": fix_data}` without mutating `state` - [ ] `_validate_fix` returns `{"fix_validated": is_valid}` (plus `"attempted_fixes"` when invalid) without mutating `state` - [ ] All three functions have return type annotation `dict[str, Any]` instead of `AutoDebugState` - [ ] The TDD test from #10494 passes (flips from expected-fail to real pass) - [ ] No regressions in existing `AutoDebugAgent` tests ## Subtasks - [x] Fix `_analyze_error` to return update dict - [x] Fix `_generate_fix` to return update dict - [x] Fix `_validate_fix` to return update dict - [x] Update return type annotations on all three functions - [x] Verify TDD test from #10494 now passes - [x] Run full test suite and confirm no regressions ## Definition of Done The issue is closed when all three node functions return update dicts, the TDD test from #10494 passes, and CI is green. --- ## Bug Report ### Summary `AutoDebugAgent` node functions (`_analyze_error`, `_generate_fix`, `_validate_fix`) mutate the input state dict in-place and return the full state object. This violates the LangGraph node contract, which requires node functions to return a dict of state **updates** (only changed keys). This can cause duplicate state entries and incorrect behavior when LangGraph merges state updates. ### Affected File `src/cleveragents/agents/graphs/auto_debug.py` ### Code Evidence **`_analyze_error`** (lines ~90-115): ```python def _analyze_error(self, state: AutoDebugState) -> AutoDebugState: # ... state.setdefault("messages", []).append( # BUG: in-place mutation { "role": "assistant", "content": analysis, "type": "error_analysis", } ) return state # BUG: returns full state, not update dict ``` **`_generate_fix`** (lines ~117-175): ```python def _generate_fix(self, state: AutoDebugState) -> AutoDebugState: # ... state["current_fix"] = fix_data # BUG: in-place mutation return state # BUG: returns full state ``` **`_validate_fix`** (lines ~177-225): ```python def _validate_fix(self, state: AutoDebugState) -> AutoDebugState: # ... state["fix_validated"] = is_valid # BUG: in-place mutation if not is_valid: attempted_fixes = state.get("attempted_fixes", []) attempted_fixes.append(current_fix) state["attempted_fixes"] = attempted_fixes # BUG: in-place mutation return state # BUG: returns full state ``` ### Contrast with Correct Pattern The `context_analysis.py` and `plan_generation.py` agents correctly return update dicts: ```python # CORRECT pattern (from context_analysis.py): def _load_files(self, state: ContextAnalysisState) -> dict[str, Any]: # ... return { "documents": documents, "error": error_msg, } ``` ### Impact 1. **Duplicate messages**: When LangGraph processes the returned state, it may merge the returned full state with the existing state, causing `messages` to be duplicated. 2. **Checkpoint inconsistency**: LangGraph's checkpointing system tracks state diffs. Returning the full state instead of updates can cause incorrect diffs to be stored. 3. **Inconsistency with other agents**: `ContextAnalysisAgent` and `PlanGenerationGraph` correctly return update dicts, making `AutoDebugAgent` inconsistent. ### Fix Return only the changed keys from each node function: ```python def _analyze_error(self, state: AutoDebugState) -> dict[str, Any]: # ... new_message = {"role": "assistant", "content": analysis, "type": "error_analysis"} return {"messages": state.get("messages", []) + [new_message]} def _generate_fix(self, state: AutoDebugState) -> dict[str, Any]: # ... return {"current_fix": fix_data} def _validate_fix(self, state: AutoDebugState) -> dict[str, Any]: # ... updates: dict[str, Any] = {"fix_validated": is_valid} if not is_valid: updates["attempted_fixes"] = state.get("attempted_fixes", []) + [current_fix] return updates ``` ### Validation Gate - [x] Code evidence: `state.setdefault(...).append(...)` and `return state` in `_analyze_error()`, `_generate_fix()`, `_validate_fix()` in `auto_debug.py` - [x] Environment verification: Contrast with correct pattern in `context_analysis.py` - [x] Actionability: Return update dicts instead of full state - [x] Codebase freshness: Verified in current HEAD - [x] Severity match: Critical - violates LangGraph contract, causes state corruption ### Blocked By Depends on TDD issue #10494. --- **Automated by CleverAgents Bot** Supervisor: Bug Hunt Pool | Agent: bug-hunt-pool-supervisor
HAL9000 added this to the v3.2.0 milestone 2026-04-18 10:20:04 +00:00
Author
Owner

[GROOMED] Quality Analysis Complete

Validity Assessment: VALID & ACTIONABLE

This is a high-quality, well-documented bug report that clearly describes a critical issue in the AutoDebugAgent node functions. The issue violates the LangGraph node contract and can cause state corruption.

Label Verification

All required labels are present:

  • State/Unverified ✓ (ready for verification)
  • Type/Bug ✓ (correctly classified)
  • Priority/Critical ✓ (appropriate severity)

Milestone Assignment

Assigned to: v3.2.0 (M3: Decisions + Validations + Invariants)

This is the appropriate milestone for critical bug fixes in the current development cycle.

🚨 CRITICAL PRIORITY FLAG

This issue requires immediate attention. It is:

  • Priority/Critical - violates LangGraph contract, causes state corruption
  • Well-scoped - three specific functions identified with code evidence
  • Actionable - clear fix proposal with examples
  • Blocked by #10494 - TDD test dependency noted

📋 Issue Quality Summary

Strengths:

  • Clear, specific title with function names
  • Comprehensive metadata (commit, branch)
  • Detailed background and context
  • Expected behavior clearly stated
  • Acceptance criteria with checkboxes (6 items)
  • Subtasks broken down (6 items)
  • Definition of Done provided
  • Code evidence with actual code snippets
  • Contrast with correct pattern from other agents
  • Impact analysis (3 specific impacts)
  • Proposed fix with code examples
  • Validation gate completed
  • Dependency tracking (#10494)

Recommendation: Move to State/Verified once implementation planning begins. This issue is ready for assignment to an implementor.

🔗 Dependencies

  • Blocked by: #10494 (TDD test for this fix)
  • Affects: src/cleveragents/agents/graphs/auto_debug.py
  • Related agents: ContextAnalysisAgent, PlanGenerationGraph (correct patterns)

📝 Next Steps

  1. Verify TDD test #10494 is ready
  2. Assign to implementation worker
  3. Implement fixes to three node functions
  4. Verify all acceptance criteria pass
  5. Confirm CI is green

Automated by CleverAgents Bot
Supervisor: Grooming | Agent: grooming-pool-supervisor

## [GROOMED] Quality Analysis Complete ### ✅ Validity Assessment: VALID & ACTIONABLE This is a **high-quality, well-documented bug report** that clearly describes a critical issue in the `AutoDebugAgent` node functions. The issue violates the LangGraph node contract and can cause state corruption. ### ✅ Label Verification All required labels are present: - **State/Unverified** ✓ (ready for verification) - **Type/Bug** ✓ (correctly classified) - **Priority/Critical** ✓ (appropriate severity) ### ✅ Milestone Assignment **Assigned to: v3.2.0 (M3: Decisions + Validations + Invariants)** This is the appropriate milestone for critical bug fixes in the current development cycle. ### 🚨 CRITICAL PRIORITY FLAG **This issue requires immediate attention.** It is: - **Priority/Critical** - violates LangGraph contract, causes state corruption - **Well-scoped** - three specific functions identified with code evidence - **Actionable** - clear fix proposal with examples - **Blocked by #10494** - TDD test dependency noted ### 📋 Issue Quality Summary **Strengths:** - ✅ Clear, specific title with function names - ✅ Comprehensive metadata (commit, branch) - ✅ Detailed background and context - ✅ Expected behavior clearly stated - ✅ Acceptance criteria with checkboxes (6 items) - ✅ Subtasks broken down (6 items) - ✅ Definition of Done provided - ✅ Code evidence with actual code snippets - ✅ Contrast with correct pattern from other agents - ✅ Impact analysis (3 specific impacts) - ✅ Proposed fix with code examples - ✅ Validation gate completed - ✅ Dependency tracking (#10494) **Recommendation:** Move to **State/Verified** once implementation planning begins. This issue is ready for assignment to an implementor. ### 🔗 Dependencies - **Blocked by:** #10494 (TDD test for this fix) - **Affects:** `src/cleveragents/agents/graphs/auto_debug.py` - **Related agents:** `ContextAnalysisAgent`, `PlanGenerationGraph` (correct patterns) ### 📝 Next Steps 1. Verify TDD test #10494 is ready 2. Assign to implementation worker 3. Implement fixes to three node functions 4. Verify all acceptance criteria pass 5. Confirm CI is green --- **Automated by CleverAgents Bot** Supervisor: Grooming | Agent: grooming-pool-supervisor
Author
Owner

Implementation Attempt — Tier 1: Haiku — Success

Implemented the fix for LangGraph node contract violation.

Changes: Node functions now return partial state dicts instead of mutating state in-place.

Quality gates: lint ✓, typecheck ✓, unit_tests ✓

PR: #10740


Automated by CleverAgents Bot
Supervisor: Implementation Pool | Agent: implementation-worker

**Implementation Attempt** — Tier 1: Haiku — Success Implemented the fix for LangGraph node contract violation. **Changes:** Node functions now return partial state dicts instead of mutating state in-place. **Quality gates:** lint ✓, typecheck ✓, unit_tests ✓ **PR:** https://git.cleverthis.com/cleveragents/cleveragents-core/pulls/10740 --- **Automated by CleverAgents Bot** Supervisor: Implementation Pool | Agent: implementation-worker
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Orphaned hierarchy detection (via grooming of PR #11153):

This issue body references "Parent Epic: #9779" but no dependency link exists between this issue and Epic #9779. Per project guidelines, regular issues must maintain a parent Epic dependency link.

Additionally, reviewer HAL9001 (PR review #8820 on PR #11153) noted that #9779 appears to be an Automation Tracking issue rather than a proper Type/Epic for auto_debug work. The project owner should confirm whether this is the correct parent Epic and add a manual dependency link via Forgejo UI.

Automated by CleverAgents Bot
Supervisor: Grooming | Agent: grooming-worker

Orphaned hierarchy detection (via grooming of PR #11153): This issue body references "Parent Epic: #9779" but no dependency link exists between this issue and Epic #9779. Per project guidelines, regular issues must maintain a parent Epic dependency link. Additionally, reviewer HAL9001 (PR review #8820 on PR #11153) noted that #9779 appears to be an Automation Tracking issue rather than a proper Type/Epic for auto_debug work. The project owner should confirm whether this is the correct parent Epic and add a manual dependency link via Forgejo UI. Note: PR #11153 (which closes this issue) also has no dependency link back to this issue. That relationship needs to be established so the PR blocks Issue #10496 as required by project standards. --- Automated by CleverAgents Bot Supervisor: Grooming | Agent: grooming-worker
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dependency-test

dependency-test
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