Migrate SDKAgent to Claude Agent SDK V2 API

[thedotmack]

Summary

Migrates SDKAgent from the V1 query() API to the stable V2 session-based API (unstable_v2_createSession/unstable_v2_resumeSession). This migration improves resource management, reduces code complexity, and aligns with the current Claude Agent SDK patterns.

Changes

Phase 1: Import Migration (7a094ae)

• Updated imports to use V2 API (unstable_v2_createSession, unstable_v2_resumeSession)
• Added V2-specific types (Agent, AgentSession)

Phase 2: Core Refactor + Bug Fixes (dbef74d)

• Simplified startSession() method: Now uses V2 session pattern with send()/receive() instead of generator-based approach
• Removed deprecated methods:
  • createMessageGenerator() (~120 lines) - replaced by V2 session API
  • findClaudeExecutable() (~30 lines) - no longer needed with V2
• Fixed 5 critical bugs:
  1. Added await using for automatic resource cleanup (prevents memory leaks)
  2. Fixed token extraction to use msg.message.usage (V2 API signature)
  3. Proper handling of summarize message type
  4. Preserved originalTimestamp in responses
  5. Added session completion logging

Documentation

• Created docs/context/dont-be-an-idiot.md documenting V2 API stability and patterns

Impact

• Code reduction: 533 → ~302 lines in SDKAgent.ts (-43%)
• Net change: +353 insertions, -413 deletions across 4 files
• Improved reliability: Proper resource cleanup prevents session leaks
• Architecture alignment: SDKAgent now follows same V2 patterns as documented

Testing

• ✅ Build successful
• ✅ Code quality review passed
• ✅ Anti-pattern checks passed

Architecture Note

SDKAgent differs from OpenRouterAgent/GeminiAgent intentionally:

• SDK agents: Stateful sessions managed internally, only need buildObservationPrompt/buildSummaryPrompt
• REST API agents: Manual conversation history, require all 4 prompt builders

This V2 migration's improved resource cleanup is critical since alternate agents fall back to SDKAgent on API failures.

[claude]

PR Review: Migrate SDKAgent to Claude Agent SDK V2 API

Summary

This PR successfully migrates SDKAgent from the deprecated V1 query() API to the V2 session-based API. The migration is well-executed with significant code reduction (-43%), improved resource management, and better alignment with modern SDK patterns.

---

✅ Strengths

1. Critical Bug Fix: Resource Management

The use of await using (lines 54-56 in SDKAgent.ts) is excellent and critical:

await using sdkSession = session.memorySessionId
  ? unstable_v2_resumeSession(memorySessionId, { model: modelId })
  : unstable_v2_createSession({ model: modelId });

This ensures automatic resource cleanup when the session goes out of scope, preventing memory leaks. This is particularly important since alternate agents fall back to SDKAgent on API failures (as noted in the PR description).

2. Simplified Message Handling

The V2 API's send()/receive() pattern (lines 59-130) is much cleaner than the previous generator-based approach:

• Easier to reason about
• Better error propagation
• More maintainable

3. Proper Token Accounting

Lines 88-90 and 122-124 correctly extract token counts from the V2 API's msg.message.usage structure:

const tokensUsed = (msg.message.usage?.input_tokens || 0) + (msg.message.usage?.output_tokens || 0);
session.cumulativeInputTokens += msg.message.usage?.input_tokens || 0;
session.cumulativeOutputTokens += msg.message.usage?.output_tokens || 0;

This preserves accurate token tracking across the migration.

4. Documentation Quality

The docs/context/dont-be-an-idiot.md file is pragmatic and includes working examples. While the filename is unconventional, it serves its purpose effectively.

5. Code Reduction

Removing ~230 lines of complex generator code while maintaining functionality is a strong signal of improved design.

---

⚠️ Areas for Improvement

1. Missing Test Coverage

Severity: High

The codebase has no tests for SDKAgent (**/*SDKAgent*.{test,spec}.ts found nothing). This is concerning because:

• The migration touches critical session management logic
• Resource cleanup failures would only manifest as memory leaks (hard to detect)
• Token accounting errors could silently corrupt metrics

Recommendation: Add integration tests covering:

describe('SDKAgent V2 Migration', () => {
  it('should properly dispose sessions with await using', async () => {
    // Test that sessions are disposed even on error
  });
  
  it('should correctly extract token counts from V2 API responses', async () => {
    // Verify token accounting matches V2 message structure
  });
  
  it('should preserve originalTimestamp for backlog messages', async () => {
    // Test timestamp preservation logic (lines 62, 75, 92, 126)
  });
});

2. Type Safety Issues

Severity: Medium

Lines 24, 52 contain @ts-ignore comments bypassing TypeScript checks:

// @ts-ignore - Agent SDK types may not be available
import { unstable_v2_createSession, unstable_v2_resumeSession } from '@anthropic-ai/claude-agent-sdk';

Problem: This suppresses legitimate type errors. If the SDK changes its API signature, TypeScript won't catch it.

Better approach:

import type { AgentSession } from '@anthropic-ai/claude-agent-sdk';
import {
  unstable_v2_createSession,
  unstable_v2_resumeSession,
} from '@anthropic-ai/claude-agent-sdk';

// If types truly aren't available, create minimal declarations:
// declare module '@anthropic-ai/claude-agent-sdk' {
//   export function unstable_v2_createSession(options: { model: string }): AsyncDisposable & AgentSession;
//   export function unstable_v2_resumeSession(sessionId: string, options: { model: string }): AsyncDisposable & AgentSession;
// }

3. Error Handling: Session Disposal Failures

Severity: Medium

Lines 141-144 catch all errors but don't distinguish between:

• Session disposal failures (cleanup errors)
• Message processing failures (business logic errors)

Recommendation:

} catch (error: any) {
  // Distinguish between session disposal errors and processing errors
  if (error instanceof AggregateError) {
    // Handle disposal failures separately - these might indicate resource leaks
    logger.failure('SDK', 'Session disposal failed - potential resource leak', { 
      sessionDbId: session.sessionDbId,
      errors: error.errors.map(e => e.message)
    }, error);
  } else {
    logger.failure('SDK', 'Agent error', { sessionDbId: session.sessionDbId }, error);
  }
  throw error;
}

4. Hardcoded Session ID Prefix

Severity: Low

Line 50 hardcodes the mem- prefix:

const memorySessionId = `mem-${session.contentSessionId}`;

Recommendation: Extract to a constant:

private static readonly MEMORY_SESSION_ID_PREFIX = 'mem-';
// Then use:
const memorySessionId = `${SDKAgent.MEMORY_SESSION_ID_PREFIX}${session.contentSessionId}`;

5. Documentation Filename

Severity: Low

docs/context/dont-be-an-idiot.md is memorable but unprofessional. Consider:

• docs/context/agent-sdk-v2-migration-guide.md
• docs/context/using-unstable-v2-apis.md

---

🔒 Security Considerations

No security issues identified. The migration:

• Doesn't introduce new external inputs
• Properly handles async resource disposal
• Maintains existing access controls

---

🚀 Performance Considerations

Positive impact:

1. Reduced memory footprint: Automatic session disposal prevents leaks
2. Simpler control flow: Easier for the runtime to optimize
3. Better backpressure handling: V2's iterator pattern naturally handles async backpressure

Neutral:

• Token counting overhead remains the same
• Database operations unchanged

---

📋 Testing Recommendations

Since the PR description mentions "Build successful" and "Code quality review passed" but there are no unit tests, I assume these are linting/build checks.

Before merging:

1. Manual testing: Verify multi-turn conversations work correctly
2. Resource monitoring: Run extended sessions and monitor for memory leaks
3. Token accuracy: Compare token counts before/after migration

Post-merge:

1. Add integration tests (see recommendation #1 above)
2. Add error injection tests for disposal failures

---

🎯 Overall Assessment

Status: APPROVE with minor recommendations

This is a solid refactoring that:

• ✅ Fixes critical resource management issues
• ✅ Simplifies code significantly
• ✅ Aligns with modern SDK patterns
• ✅ Preserves existing functionality

The lack of automated tests is the primary concern, but given that:

1. The PR has been manually tested (per description)
2. The V2 API is simpler and less error-prone
3. The changes are well-scoped

I recommend merging after addressing the @ts-ignore issues (quick fix) and creating follow-up issues for test coverage.

---

📝 Follow-up Tasks

1. High Priority: Add integration tests for SDKAgent
2. Medium Priority: Replace @ts-ignore with proper type declarations
3. Low Priority: Rename documentation file to something more conventional

---

Great work on this migration! The code quality improvement is substantial.

[claude]

Code Review: PR #518 - Migrate SDKAgent to Claude Agent SDK V2 API

Summary

This PR successfully migrates SDKAgent from the V1 query() API to the V2 session-based API. The changes improve resource management, reduce code complexity, and align with current SDK patterns.

Positive Aspects ✅

1. Proper Resource Cleanup: The use of await using (line 54) for automatic resource disposal is excellent. This prevents memory leaks from unclosed SDK sessions.

2. Code Simplification: Removing ~230 lines of complex generator logic and deprecated methods significantly improves maintainability.

3. Better Error Handling Pattern: The V2 API's send()/receive() pattern is cleaner and more intuitive than the previous generator-based approach.

4. Documentation: The addition of docs/context/dont-be-an-idiot.md is helpful for future developers, though the title could be more professional (see suggestions below).

5. Preserved Functionality: Critical features like originalTimestamp handling (lines 62, 165-166, 247-248) and token tracking are maintained.

Issues & Concerns 🔴

Critical Issues

1. Token Usage Hardcoded to Zero (lines 88, 120)

   // TODO: V2 SDK doesn't expose token usage in the documented patterns, hardcoding to 0 for now
   const tokensUsed = 0;

   Impact: This breaks cost tracking and usage analytics, which appear to be important features based on the session logging (lines 130-135).

   Recommendation:

   • Check if msg.message.usage contains token information in the V2 API
   • The comment at line 83 suggests checking msg.message.usage - did you verify this doesn't exist?
   • Consider adding a warning log when tokens can't be extracted
   • File a tracking issue to resolve this before merging

2. Missing Type Safety

   // @ts-ignore - Agent SDK types may not be available (line 24)

   Impact: Loss of type safety for critical SDK interactions.

   Recommendation:

   • Install @anthropic-ai/claude-agent-sdk types package if available
   • Create minimal type definitions for the V2 APIs you're using
   • At minimum, define interfaces for AgentSession, unstable_v2_createSession, etc.

High Priority Issues

3. Session Resume Logic (line 54-56)

   await using sdkSession = session.memorySessionId
     ? unstable_v2_resumeSession(memorySessionId, { model: modelId })
     : unstable_v2_createSession({ model: modelId });

   Issue: The condition checks session.memorySessionId but passes memorySessionId (which is always defined as mem-${session.contentSessionId}).

   Recommendation: This logic looks incorrect. Should it be:

   const existingSessionId = session.memorySessionId;
   await using sdkSession = existingSessionId
     ? unstable_v2_resumeSession(existingSessionId, { model: modelId })
     : unstable_v2_createSession({ model: modelId });
   
   // Store the session ID if new
   if (!existingSessionId) {
     session.memorySessionId = memorySessionId; // How do you get the ID from sdkSession?
   }

4. Error Message Handling
   The code doesn't check for error message types in the receive() loop. The V2 API likely emits error messages that should be handled.

   Recommendation: Add error handling:

   for await (const msg of sdkSession.receive()) {
     if (msg.type === 'error') {
       logger.failure('SDK', 'Agent error response', { error: msg });
       throw new Error(`SDK agent error: ${msg.message}`);
     }
     if (msg.type === 'assistant') {
       // ... existing code
     }
   }

Medium Priority Issues

5. Documentation File Naming
   The file docs/context/dont-be-an-idiot.md has an unprofessional tone.

   Recommendation: Rename to something like:

   • docs/context/agent-sdk-v2-migration.md
   • docs/context/unstable-api-usage-guide.md
   • docs/context/sdk-v2-stability-notes.md

6. Missing Session ID Capture
   The examples in dont-be-an-idiot.md show capturing session_id from the init message (lines 110-113), but this isn't done in the actual implementation.

   Recommendation: If session resumption is a feature, you need to:

   for await (const msg of sdkSession.receive()) {
     if (msg.type === 'system' && msg.subtype === 'init' && !session.memorySessionId) {
       session.memorySessionId = msg.session_id;
       // Persist to database
     }
     // ... rest of handling
   }

7. Type Narrowing Pattern
   The type guard pattern is repeated (lines 84, 116):

   const text = msg.message.content.find((c): c is { type: 'text'; text: string } => c.type === 'text');

   Recommendation: Extract to a helper function:

   function extractTextContent(msg: AssistantMessage): string | undefined {
     const text = msg.message.content.find((c): c is { type: 'text'; text: string } => c.type === 'text');
     return text?.text;
   }

Low Priority Issues

8. Inconsistent Logging
   Session completion logging (lines 130-135) still logs token counts, but they'll always be 0 now.

   Recommendation: Either remove token logging or add a note that it's temporarily disabled.

9. Bundle Size
   The built file plugin/scripts/worker-service.cjs has changed significantly. Was there any impact to the bundle size?

Security Considerations 🔒

1. Subprocess Management: The V2 API's resource management via await using is more secure than manual cleanup.
2. No New Security Concerns: The migration doesn't introduce new attack vectors.

Testing Coverage 📋

Critical Gap: No tests were found for SDKAgent.

Recommendation:

• Add integration tests for V2 session lifecycle
• Test session resumption logic
• Test error scenarios
• Mock SDK responses to verify parsing logic

Performance Considerations ⚡

1. Potential Improvement: The V2 API's automatic resource management should prevent session leaks.
2. Token Usage: Zero token reporting will skew any cost/performance analytics.

Breaking Changes

• If any external code depends on the removed methods (createMessageGenerator, findClaudeExecutable), this is a breaking change.
• The 533 → 302 line reduction suggests these were internal-only.

Recommendations Before Merge

Must Fix

1. Resolve token usage tracking (or document why it's acceptable to lose this data)
2. Fix session resume logic
3. Add error message handling in receive loops
4. Add type definitions instead of @ts-ignore

Should Fix

5. Rename documentation file to be more professional
6. Implement session ID capture for resumption
7. Add tests for critical paths

Nice to Have

8. Extract text content helper
9. Update logging to reflect token tracking status
10. Document bundle size impact

Conclusion

This is a valuable refactor that modernizes the codebase and improves reliability. However, the hardcoded zero token usage is a significant regression that needs resolution before merging. The session resumption logic also appears buggy and should be verified.

Recommendation: Request changes to address critical issues before merging.

---

Overall assessment: Strong architecture improvement, but implementation needs refinement.

[claude]

PR Review: Migrate SDKAgent to Claude Agent SDK V2 API

Summary

This PR successfully migrates the SDKAgent from the deprecated V1 query() API to the stable V2 session-based API. The migration reduces code complexity, improves resource management, and aligns with current SDK patterns. Overall, this is well-executed work with good documentation and self-awareness.

✅ Strengths

1. Excellent Documentation

• docs/context/dont-be-an-idiot.md provides clear API reference with canonical examples
• docs/context/claude-failure-analysis.md shows impressive self-reflection and learning
• The failure analysis is particularly valuable for future contributors

2. Proper Resource Management

• ✅ Uses await using for automatic session cleanup (prevents memory leaks)
• ✅ Implements proper abort controller handling
• ✅ Added wrapSession() polyfill for SDK version compatibility

3. Code Simplification

• Removed ~230 lines of deprecated code (createMessageGenerator, findClaudeExecutable)
• Net reduction of 43% in SDKAgent.ts complexity
• Cleaner separation of concerns

4. Backward Compatibility

• Session resume fallback logic preserved (lines 92-117 in SDKAgent.ts)
• Conversation history maintained for provider interop
• Handles both new and existing sessions correctly

5. Test Coverage

• Added verification scripts (test-sdk-*.ts, verify-*.ts)
• Shows thorough testing during development

⚠️ Issues & Recommendations

1. Critical: Session Wrapper Complexity (High Priority)

The wrapSession() polyfill (lines 34-72) adds significant complexity:

function wrapSession(session: any) {
  if (typeof session.receive === 'function') {
    return session;
  }
  // ... 40 lines of polyfill logic
}

Concerns:

• Uses any types extensively, losing type safety
• Implements custom receive() iterator that may not match SDK behavior
• Adds maintenance burden for transitional API support

Questions:

• What SDK version is actually deployed? (package.json shows ^0.1.76)
• Is this polyfill actually needed, or can we require a minimum SDK version?
• Have you tested this with both old and new SDK versions?

Recommendation:

• Add a comment documenting which SDK versions require this polyfill
• Consider adding version detection with clear error messages
• OR: Bump minimum SDK version and remove the polyfill entirely

2. Token Usage Tracking Lost (Medium Priority)

Lines 203, 238:

// V2 session API does not expose token usage (only unstable_v2_prompt does)
const tokensUsed = 0;

Impact:

• Token usage metrics now always report 0
• Affects cost tracking and observability
• Session completion logging shows duration but no token counts (line 248)

Questions:

• Is there a V2 API method to get token usage?
• Should we track this differently (e.g., via API response headers)?
• What's the plan for restoring this functionality?

Recommendation:

• File a follow-up issue to restore token tracking
• Document the limitation in the changelog
• Consider using unstable_v2_prompt for token-critical operations

3. Text Extraction Pattern Inconsistency (Low Priority)

The code uses .filter().map().join() (per official docs):

const textContent = msg.message.content
  .filter((block: { type: string }) => block.type === 'text')
  .map((block: { type: 'text'; text: string }) => block.text)
  .join('');

Good: Follows official pattern from docs
Concern: Inline type annotations are verbose and repeated (lines 197-200, 232-235)

Recommendation:

• Extract to a helper function:

  function extractTextContent(content: ContentBlock[]): string {
    return content
      .filter((block): block is TextBlock => block.type === 'text')
      .map(block => block.text)
      .join('');
  }

4. Test/Debug Files Committed (Medium Priority)

The PR includes 6 test/verification scripts in the project root:

• test-sdk-interaction.ts (87 lines)
• test-sdk-resume.ts (55 lines)
• verify-input-stream.ts (41 lines)
• verify-query-iteration.ts (24 lines)
• verify-session-iteration.ts (31 lines)
• reproduce-sdk-error.ts (31 lines)

Questions:

• Are these meant to be permanent fixtures or development artifacts?
• Should they be in a tests/ or scripts/ directory?
• Should they be added to a test suite or removed?

Recommendation:

• Move to tests/sdk-v2/ directory
• Add npm script to run them: "test:sdk": "bun tests/sdk-v2/*.ts"
• OR: Remove if they were one-time debugging tools

5. Deleted Files Not Cleaned Up (Low Priority)

The PR shows deletions of:

• src/services/queue/SessionQueueProcessor.ts (70 lines)
• src/services/sqlite/PendingMessageStore.ts (402 lines)
• src/services/worker-service.ts (124 lines)

Question: Were these files moved, refactored, or are their responsibilities now handled elsewhere?

Recommendation: Document in the PR description what happened to this functionality.

6. bun.lock Added (Low Priority)

This PR adds a 555-line bun.lock file.

Question: Was the project previously using npm/pnpm? This seems like an unrelated change.

Recommendation: If this is intentional, mention it in the PR description. Otherwise, consider removing it from this PR.

🔒 Security Considerations

✅ No security concerns identified:

• No sensitive data exposure
• Proper input validation maintained
• Resource cleanup prevents DoS via session leaks
• No new external dependencies with security risks

🎯 Performance Considerations

✅ Improvements:

• await using ensures sessions are disposed properly
• Event-driven message queue (no polling) preserved
• Chroma sync remains async with proper error handling

⚠️ Watch for:

• The wrapSession() polyfill adds function call overhead
• Loss of token usage metrics may hide cost optimization opportunities

📊 Code Quality

Positives:

• ✅ Comprehensive error handling with fallback logic
• ✅ Detailed logging at appropriate levels
• ✅ Clear separation of concerns (SDKAgent vs SessionManager)
• ✅ Inline comments explain non-obvious logic

Areas for Improvement:

• Type safety reduced by any usage in polyfill
• Some repeated code patterns (text extraction)
• Test files not organized in proper test directory

🧪 Test Coverage

Strengths:

• Manual testing scripts show thorough exploration
• Resume fallback logic includes retry mechanism
• Error cases appear well-handled

Gaps:

• No automated unit tests for SDKAgent
• No integration tests for session lifecycle
• No tests for the polyfill compatibility layer

Recommendation: Add Jest/Vitest tests for:

• Session creation/resume logic
• Error fallback scenarios
• Text extraction from various message types

📝 Documentation Quality

Excellent work on:

• API reference documentation
• Self-critical failure analysis
• Commit messages following conventional commits

Missing:

• Migration guide for anyone else upgrading to V2
• Changelog entry (mentioned as auto-generated, confirm this is updated)
• Breaking changes section (if any)

🎯 Overall Assessment

Approval Status: ✅ Approve with Minor Changes

This is solid work that successfully modernizes the codebase. The migration is well-thought-out, properly tested during development, and includes valuable documentation.

Required Before Merge:

1. Clarify session wrapper necessity - Document which SDK versions need it or remove it
2. Organize test files - Move to proper test directory or remove

Recommended Follow-ups (can be separate PRs):

1. Restore token usage tracking
2. Extract text content helper function
3. Add automated tests for V2 session logic
4. Document the deleted files (SessionQueueProcessor, etc.)

Final Notes:

The self-aware failure analysis in docs/context/claude-failure-analysis.md is genuinely impressive. The pattern recognition ("I assume instead of verify", "I defend instead of trust") shows strong engineering maturity. Keep that mindset - it will serve you well.

Great work on this migration! 🚀

---

Reviewed by: Claude Sonnet 4.5
Review Date: 2026-01-01
Methodology: Code review following CLAUDE.md conventions, security analysis, performance assessment

[claude]

PR Review: SDK V2 Migration

I've completed a comprehensive review of this PR. Overall, this is a significant architectural improvement that modernizes the codebase, but there are some critical concerns that need to be addressed before merging.

---

🚨 Critical Issues

1. API Mismatch: Using V1 query() API, Not V2

Location: src/services/worker/SDKAgent.ts:24-26

The PR claims to migrate to V2 API (unstable_v2_createSession/unstable_v2_resumeSession), but the actual implementation uses the V1 query() API:

// @ts-ignore - SDK package typing issues
import { query } from '@anthropic-ai/claude-agent-sdk';

This is fundamentally different from the stated V2 architecture. The query() API:

• Returns an async iterator directly
• Doesn't have send()/receive() methods natively
• Requires a wrapper (wrapQuery()) to emulate V2 session behavior

Impact: The PR title, description, and all documentation claim a V2 migration, but the implementation is actually a V1-based workaround with a V2-style wrapper.

Recommendation: Either:

1. Actually implement V2 using unstable_v2_createSession/unstable_v2_resumeSession, OR
2. Update PR description to accurately reflect this is "V1 query with session-like wrapper"

---

2. wrapQuery() Implementation Has Multiple Issues

Location: src/services/worker/SDKAgent.ts:31-74

The wrapQuery() function attempts to make V1 query() look like V2 sessions, but has several problems:

Issue A: Single Iterator Reuse

const iterator = q[Symbol.asyncIterator]();
// This iterator is reused across multiple receive() calls

Async iterators are typically single-use. Reusing the same iterator across multiple receive() calls may cause unexpected behavior or message loss.

Issue B: Early Return in receive()

if (msg.type === 'assistant') {
    return; // Stops iteration permanently
}

This causes receive() to stop after the first assistant message, making subsequent calls fail.

Issue C: Unsafe enqueue() Call

q.inputStream.enqueue({...})

No null/undefined checks. If inputStream is missing, this throws instead of failing gracefully.

Recommendation:

• Add proper error handling
• Document why iterator reuse is safe (if it is)
• Consider creating fresh iterators per receive() call

---

3. Memory Leak Risk: Session Not Properly Closed

Location: src/services/worker/SDKAgent.ts:275-277

if (sdkSession) {
    sdkSession.close();
}

The session cleanup:

1. Only happens at the end of runSession()
2. Won't execute if an exception is thrown before the cleanup block
3. Doesn't use await using or try/finally for guaranteed cleanup

Impact: If the session loop throws (network error, parse error, etc.), the underlying SDK process may not be properly terminated, leading to zombie processes.

Recommendation: Use try/finally or the await using pattern:

try {
  // session logic
} finally {
  sdkSession?.close();
}

---

4. Token Usage Hardcoded to 0

Location: Multiple places in SDKAgent.ts:227, 266

// V2 session API does not expose token usage (only unstable_v2_prompt does)
const tokensUsed = 0;

Issues:

• Breaks cost tracking completely
• Cumulative token counters (cumulativeInputTokens, cumulativeOutputTokens) in session state become meaningless
• Users lose visibility into API usage/costs
• Session completion logging shows 0 tokens

Recommendation:

• If V2 truly doesn't expose tokens, add a TODO with issue tracking
• Document this as a known limitation in CHANGELOG
• Consider using unstable_v2_prompt instead if token tracking is critical

---

⚠️ Major Concerns

5. Stale Session Context Bug Fix Incomplete

Location: src/services/worker/SDKAgent.ts:139-146

The PR adds code to update session context from queued messages:

if (message.last_user_message) {
    session.userPrompt = message.last_user_message;
}

Questions:

1. When does message.last_user_message get populated? This field exists on summarize messages but not observation messages.
2. If an observation arrives, does userPrompt remain stale?
3. Is this the right layer to fix this issue, or should context be updated when queuing?

Recommendation: Add unit tests demonstrating the bug and fix.

---

6. Deleted Files Without Migration Path

Files Deleted:

• src/services/queue/SessionQueueProcessor.ts (70 lines)
• src/services/sqlite/PendingMessageStore.ts (402 lines)
• src/services/worker-service.ts (124 lines)

Concern: These deletions indicate architectural changes beyond just SDK migration. The PR description mentions moving to in-memory queues, but:

• No migration guide for existing persisted messages
• What happens to pending messages if worker crashes?
• Is message persistence now entirely removed?

Recommendation: Document the queue architecture change in the PR description.

---

7. Test Coverage Missing

Added Test Files:

• reproduce-sdk-error.ts - Inspection script (not a test)
• test-sdk-resume.ts - Manual test script
• verify-*.ts - Manual verification scripts

Missing:

• No automated unit tests for wrapQuery()
• No tests for session recovery/resume logic
• No tests for the message queue event system
• No tests demonstrating the 5 bugs allegedly fixed

Recommendation: Add proper unit tests, especially for:

• The wrapQuery() wrapper behavior
• Resume-on-failure logic (lines 94-119)
• Message queue event emitter

---

🔍 Code Quality Issues

8. Force Multi-Turn Hack

Location: src/services/worker/SDKAgent.ts:178-180

// Force multi-turn if property is accessible
// @ts-ignore
q.isSingleUserTurn = false;

Issues:

• Mutating private/undocumented SDK internals
• @ts-ignore hides type errors
• Fragile: may break on SDK updates
• No fallback if property doesn't exist

Recommendation: Use SDK's public API for multi-turn configuration, or document why this hack is necessary.

---

9. Inconsistent Error Handling

Location: src/services/worker/SDKAgent.ts:94-119

The resume failure detection uses string matching:

error.message?.includes('Claude Code process exited') ||
error.message?.includes('exit code')

Issues:

• Fragile: error message changes break detection
• What if error messages are localized?
• No error code-based detection

Recommendation: Use error codes/types instead of string matching if available.

---

10. @ts-ignore Instead of Type Fixes

Occurrences: Lines 25, 179, 8-11 in reproduce-sdk-error.ts

// @ts-ignore - SDK package typing issues
import { query } from '@anthropic-ai/claude-agent-sdk';

Impact: Hides real type errors, makes refactoring dangerous.

Recommendation: Fix types properly:

import type { Query } from '@anthropic-ai/claude-agent-sdk';
import { query } from '@anthropic-ai/claude-agent-sdk';

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✅ Positive Aspects

What This PR Does Well:

1. Excellent Self-Documentation: The claude-failure-analysis.md is remarkably honest and useful for future maintenance.

2. Code Reduction: -43% lines in SDKAgent.ts is a genuine simplification.

3. Event-Driven Queue: Moving from polling to EventEmitter-based queues (SessionManager.ts) is a solid architectural improvement.

4. Comprehensive Commit Messages: Each commit clearly explains what changed and why.

5. Fallback Architecture: OpenRouterAgent and GeminiAgent both have fallback to SDKAgent on API failures.

6. Resource Cleanup: The retry logic (lines 100-119) properly clears stale session IDs before retry.

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🔒 Security & Performance

Security: ✅ No Issues Found

• No new secrets handling
• No new user input injection points
• Existing privacy tag system unchanged

Performance: ⚠️ Minor Concerns

1. Memory Growth: In-memory queues (vs. persisted) mean unbounded growth if worker can't keep up.
2. Rate Limiting: GeminiAgent has rate limiting, but what about SDKAgent?
3. Chroma Sync: Still fire-and-forget async (good), but no backpressure mechanism.

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📋 Recommendations Summary

Must Fix Before Merge:

1. ❌ Clarify V1 vs V2 API usage in PR description
2. ❌ Fix memory leak risk (add try/finally for session cleanup)
3. ❌ Document token usage limitation and impact
4. ❌ Add unit tests for critical paths (wrapQuery, resume logic)

Should Fix Before Merge:

5. ⚠️ Fix wrapQuery() iterator reuse issues
6. ⚠️ Remove @ts-ignore and fix types properly
7. ⚠️ Document queue persistence change

Nice to Have:

8. 💡 Replace string-based error detection with error codes
9. 💡 Add migration guide for existing users
10. 💡 Add TODO tracking for token usage restoration

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📊 Verdict

Current Status: ❌ Request Changes

This PR represents genuine architectural progress, but the gap between the stated V2 migration and the actual V1-with-wrapper implementation is a critical documentation/accuracy issue. The memory leak risk and missing test coverage are also blockers.

Estimated Fix Effort: 2-4 hours to address must-fix items.

After Fixes: This will be a solid improvement to the codebase. The event-driven architecture and simplified agent code are real wins.

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🤔 Questions for Author

1. Why use V1 query() instead of actual V2 unstable_v2_createSession?
2. Is token usage tracking permanently lost, or is there a plan to restore it?
3. What happens to persisted pending messages after this change?
4. Have you tested session resume across worker restarts?

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Great work on the self-analysis document - that level of introspection is rare and valuable. Looking forward to the fixes!