Bug Description
The workflow stops for no reason. When I try to write a follow-up prompt, it reveals the "tool_use ids were found without tool_result blocks" error message. It prevents me from creating a truly autonomous workflow.

Environment Info

• Platform: darwin
• Terminal: cursor
• Version: 1.0.71
• Feedback ID: de619269-71e4-4a2d-8057-3df7bf61893e

Errors

[
  {
    "error": "Error: Request was aborted.\n    at new sW (unknown:1:28)\n    at new qY (/$bunfs/root/claude:876:1853)\n    at new sJ (/$bunfs/root/claude:876:2641)\n    at _createMessage (/$bunfs/root/claude:884:7955)\n    at processTicksAndRejections (native:7:39)",
    "timestamp": "2025-08-08T05:16:28.686Z"
  },
  {
    "error": "Error: Request was aborted.\n    at new sW (unknown:1:28)\n    at new qY (/$bunfs/root/claude:876:1853)\n    at new sJ (/$bunfs/root/claude:876:2641)\n    at makeRequest (/$bunfs/root/claude:893:3652)\n    at processTicksAndRejections (native:7:39)",
    "timestamp": "2025-08-08T05:23:21.851Z"
  },
  {
    "error": "Error: Error POSTing to endpoint (HTTP 404): Session not found\n    at send (/$bunfs/root/claude:903:25507)\n    at processTicksAndRejections (native:7:39)",
    "timestamp": "2025-08-08T05:24:27.196Z"
  },
  {
    "error": "Error: Error POSTing to endpoint (HTTP 404): Session not found\n    at send (/$bunfs/root/claude:903:25507)\n    at processTicksAndRejections (native:7:39)",
    "timestamp": "2025-08-08T05:24:33.294Z"
  },
  {
    "error": "Error: Error POSTing to endpoint (HTTP 404): Session not found\n    at send (/$bunfs/root/claude:903:25507)\n    at processTicksAndRejections (native:7:39)",
    "timestamp": "2025-08-08T05:24:38.025Z"
  },
  {
    "error": "Error: Error POSTing to endpoint (HTTP 404): Session not found\n    at send (/$bunfs/root/claude:903:25507)\n    at processTicksAndRejections (native:7:39)",
    "timestamp": "2025-08-08T05:24:42.410Z"
  },
  {
    "error": "Error: Error POSTing to endpoint (HTTP 404): Session not found\n    at send (/$bunfs/root/claude:903:25507)\n    at processTicksAndRejections (native:7:39)",
    "timestamp": "2025-08-08T05:25:21.031Z"
  },
  {
    "error": "Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.28: `tool_use` ids were found without `tool_result` blocks immediately after: toolu_018Ynj1mexLmRjfnRN5A3LHY. Each `tool_use` block must have a corresponding `tool_result` block in the next message.\"}}\n    at new sW (unknown:1:28)\n    at new qY (/$bunfs/root/claude:876:1853)\n    at new ZW0 (unknown:1:28)\n    at generate (/$bunfs/root/claude:876:2310)\n    at makeRequest (/$bunfs/root/claude:893:5330)\n    at processTicksAndRejections (native:7:39)",
    "timestamp": "2025-08-08T05:31:57.165Z"
  }
]

Analysis

Environment Coverage

Platform/Terminal/Version combinations affected:

• macOS: Apple Terminal (v1.0.62-64), Cursor (v1.0.67), iTerm.app (v1.0.51-59), VSCode
  (v1.0.35-61), IntelliJ (v1.0.62), Warp (v1.0.53-55), ghostty (v1.0.53)
• Linux: GNOME terminal (v1.0.62-70), Konsole (v1.0.61), VSCode (v1.0.35-53), WSL-Archlinux
  (v1.0.64)
• Windows: WSL Ubuntu + ZSH (v1.0.55), VSCode Integrated Terminal via WSL

Trigger Scenarios

When the error occurs:

• During API request timeouts (6/10 retry attempts)
• After workflow interruptions or unexpected CLI termination
• When processing files (PDF, markdown, large files >25,000 tokens)
• During tool use operations that get interrupted
• After auto-upgrading to newer versions (specifically v1.0.55)
• When sessions exceed ~2,400 tokens during compaction
• During endpoint testing with Swagger
• After git push operations with long request URLs

Key Insights

• Core Issue: API validation error requiring each tool_use block to have immediate corresponding
  tool_result block
• Version Range: Affects versions from 0.2.14 through 1.0.71+ (widespread across all recent versions)
• Root Cause: Recent API changes made tool_use/tool_result block ordering requirements stricter
• Session Recovery: Error makes conversations unrecoverable, requiring complete restart
• Pattern: Consistently results in 400 Bad Request with identical error message
• Platform Impact: Primarily affects macOS users but occurs across all platforms
• Keychain Issues: Frequently accompanied by macOS keychain access failures
• Token Limits: Related to MaxFileReadTokenExceededError (41,425 tokens vs 25,000 limit)
• Timing Sensitivity: Often occurs when messages are sent at critical moments during tool execution
• Message Ordering: Issue stems from non-standard ordering of tool_use and tool_result blocks in API messages

Workarounds

For Users:

• Session Recovery: Edit ~/.claude/projects/[PROJECT]/[LATEST-SESSION-STORE].json and remove problematic message lines
• Export/Restart: Export chat → clear conversation → restart CLI → reload exported file
• Use offset/limit parameters for large files
• Use GrepTool instead of reading entire files
• VPN if ISP blocking suspected

For Developers:

• Message Block Ordering Fix: Ensure API messages follow sequence: Tool Result Block → Text Block → Tool Request Block (per @johnewart in Missing Tool Result Block After Tool Use This error suggests that after a tool use block in the conversation, you did not include the corresponding tool result block, which is required by the API. To resolve this: 1. Ensure that any tool_use block is i #473)
• Root Cause: Recent API changes made tool_use/tool_result block ordering requirements stricter

Reference Issues

Most Comprehensive Issues:

• Missing Tool Result Block After Tool Use This error suggests that after a tool use block in the conversation, you did not include the corresponding tool result block, which is required by the API. To resolve this: 1. Ensure that any tool_use block is i #473 (oldest/most comprehensive with detailed workarounds and community discussion)
• [Meta] tool_use/tool_result block mismatch causing bad conversation state (150+ reports) #6836 (another meta/analysis issue)

Duplicate Issues (46):

• Claude Code: Session-Destroying Failures from Compaction Timeouts #2423
• Missing Tool Result Block for Tool Use ID #2630 (tool ID: toolu_01AxtNfsQwHEvRUTRnvcyxTn)
• Bug Report tool_use ids were found without tool_result blocks immediately after #2697 (tool ID: toolu_01G2Q9aJ8Jgeu5B9pMBxB3Jn)
• Feature Request: Checkpoint Rollback Mechanism for Conversation Recovery This title captures the core feature request of adding a way to roll back to previous conversation states, particularly to help recover from tool use errors or other blocking issues #2704
• Issue Title: Git Push Failure: Request URL Exceeds Length Limit This title: - Identifies the specific problem (Git push failure) - Highlights the technical root cause (URL length limit) - Uses clear, technical language - Provides immediate context for dev #2712 (tool ID: toolu_01UKxg45kCnpK3zszmhfPmB6)
• HTTP 400 Bad Request in Claude Code API Call #3549
• Missing Tool Result Block for Tool Use ID toolu_01T4rbEocUEcU3L1i8PmXfFF #3564
• Missing Tool Result Block for Tool Use ID toolu_0175bkViAT1GJvptv8DpEgbp #3608
• [BUG] ⎿ API Error: 400 invalid_request_error tool_use ids were found without tool_result` #3632
• Missing Tool Result Block for Tool Use ID #3636
• [BUG] Critical: Tool call pair maintenance. #3637
• Missing Tool Result Block for Tool Use ID toolu_015m4ArUNHceJXtPrpCNnK7L #3754 (tool ID: toolu_01T4rbEocUEcU3L1i8PmXfFF)
• Invalid Tool Use Request in Anthropic API Call #3860 (tool ID: toolu_0175bkViAT1GJvptv8DpEgbp)
• [BUG] API Error: 400 tool_use ids were found without tool_result blocks immediately after: toolu_..... Each tool_use block must have a corresponding tool_result block in the next message. #3886 (tool ID: toolu_01LsN9eeWJqu83ZEn9MMz6kD)
• Missing Tool Result Block for Tool Use ID toolu_01BFX9m1YmC5UoetsCDqPfQu #3902 (feedback ID: 9d56e0c7-a321-45b7-a1ac-430f18f51f6e; tool IDs: toolu_015m4ArUNHceJXtPrpCNnK7L, toolu_01NQv98A7JdU62r8UxsPZecG)
• Missing Tool Result Block in API Request #3916 (feedback ID: 275e8e43-5c64-4003-97b3-82f72f7e9f76; tool IDs: toolu_01BFX9m1YmC5UoetsCDqPfQu, toolu_013YTebuvpj8eXVbJNPq3BUB)
• Missing Tool Result Block for Tool Use ID toolu_01LDzXQkQWhwYy68hj2GGXva #3977 (feedback ID: 5c88895e-4454-444f-9f7b-709497747321; tool ID: toolu_01LDzXQkQWhwYy68hj2GGXva)
• Missing Tool Result Block for Tool Use ID toolu_01NX4cDJoa6Pv3PiMxrgrgKH #4454 (feedback ID: 27071de8-b2ef-4271-a795-5513badf7a26)
• Missing Tool Result Block for Tool Use ID toolu_01FCHoHXsqvL3aD5eKGMbqhk #4466 (feedback ID: 6ec710d1-c771-450d-ab57-5469a0ed1841; tool ID: toolu_01FCHoHXsqvL3aD5eKGMbqhk)
• CLI State Corruption After Unexpected Interruption #4522 (feedback ID: 236ad358-9502-4227-82c8-b655ac6863ef)
• Missing Tool Result Block for Tool Use ID toolu_01EPeY4jhznE8ipJCLiFTXiP #4563 (feedback ID: 08fb3c9a-4031-4c13-9316-2c9cced75b7e)
• Missing Tool Result Block for Tool Use ID toolu_01FWRC6QMpe6bYVfV92CFSwq #4638 (feedback ID: bf371c61-3e3a-46c5-9a01-4ca383fa56f6)
• Bug Report #4664 (feedback ID: f9ed41a6-451c-49dd-8f25-0fdb3bc7a897)
• Missing Tool Result Block for Tool Use ID #4798 (feedback ID: 22514987-f0c6-49ec-86d4-8259b159da01)
• Missing Tool Result Blocks for Tool Use IDs #4825 (feedback ID: 028bb608-0413-42b9-92cb-4735616132aa; tool IDs: toolu_016V22G6g4bAjj63qYouNsy5, toolu_01FWRC6QMpe6bYVfV92CFSwq, toolu_01EPeY4jhznE8ipJCLiFTXiP)
• Missing Tool Result Blocks for File Processing Tool Calls #4842 (tool IDs: toolu_01LRM9xs9ZGG4pcrUhcobks4, toolu_01LviFawtYc6VkX3LXTUQGqm)
• Missing Tool Result Block for Tool Use ID toolu_01AbmHJypDhKqBF7NKdRPJ6d #5060 (tool ID: toolu_01AbmHJypDhKqBF7NKdRPJ6d)
• Missing Tool Result Block for Tool Use in Anthropic API Request #5246 (tool ID: toolu_0164aoqd28of7CZLGvm6ftFU)
• Anthropic API Timeout Causing Unrecoverable State with Orphaned Tool Use Blocks #5317 (tool ID: toolu_01X1RwkGwrnZScGu9jcYSWgE)
• Missing Tool Result Block for Tool Use ID #5412 (feedback ID: e0ebdd7d-45c9-440b-b9f5-ddbffd1c02dc, tool ID: toolu_01Kjp7i9iF3xJ3z9aH4pSaRw)
• Missing Tool Result Block for Tool Use ID toolu_015UYDCWdHa5hzUsT5ZKYu4X #5421 (feedback ID: b38531f3-761e-4413-a70a-4d99fcb8ef56, tool ID: toolu_015UYDCWdHa5hzUsT5ZKYu4X)
• Tool Use Sequence Interrupted: Missing Tool Result Block #5424 (feedback ID: c2aec1a9-6adc-42db-bf98-d193be52208c, tool ID: toolu_015ZXgypVKGqFDCB2TtgNgSA)
• PDF Tool Use Failure: Missing Tool Result Blocks #5450 (feedback ID: 4d022565-35cf-49b6-b5b5-18c851762c62, tool IDs: toolu_01FCH49ioQnBrfftPQx5k1ZQ, toolu_01NeL74QdYMQm8DFGz5Pxj3A, toolu_01XirfUjk9RBjbf7UYmQEQPF)
• Missing Tool Result Block in Anthropic API Conversation #5457 (feedback ID: 8df7365b-ee0e-43f7-82d4-e5cf57e3b1f0, tool ID: toolu_01LXaVjS1uzmJHt3mAgzCAFB)
• Tool Call Failures Preventing Agent Execution #5468 (feedback ID: 81e1d09b-9465-436f-9626-79e5e3d7029d, tool ID: toolu_01K8QZqobexTyG9nJacRS8CB)
• Missing Tool Result Block for Tool Use in Sub-Agent Workflow #5470 (tool ID: toolu_01RcEBxtdXQbxB4P61SPVLSx)
• Missing Tool Result Block for Tool Use ID toolu_01PV1SAMEMizf5NAi6LXoTfn #5476 (feedback ID: 51414647-3863-4f43-93d4-4fc0289c238c, tool ID: toolu_01PV1SAMEMizf5NAi6LXoTfn)
• Missing Tool Result Block for Tool Use ID toolu_01TtqtoE6BkdCjrQPZtqCDbJ #5479 (feedback ID: ecd3ffc7-daad-4d38-b3e6-163d0a58ec6c, tool ID: toolu_01TtqtoE6BkdCjrQPZtqCDbJ)
• Missing Tool Result Block for Tool Use in incorrect and unprompted Concurrent Agents Execution #5509 (feedback ID: 6379df44-7b45-4b2c-adc5-9f7265fc1fce, tool ID: toolu_01EqqrC85cWcn92HsggWCakB)
• Bug Report tool_use ids were found without tool_result blocks #5594 (tool ID: toolu_01WNUbHpQy2RWWdoBF8JnF3r)
• Missing Tool Result Block for Tool Use ID toolu_019aLkVUFjyvChUtaKKnfbm6 #5599 (feedback ID: a8872815-f182-4a9e-8327-baa359a493de, tool ID: toolu_019aLkVUFjyvChUtaKKnfbm6)
• API Error 400: tool_use blocks without corresponding tool_result blocks #5662 (tool ID: toolu_01JX7gsswzmXeYhXg6F8wGRy)
• [BUG] tool_use ids were found without tool_result blocks immediately after #5705 (tool ID: toolu_019MgEXFFrY5MHhv9PqJDRQe)
• Missing Tool Result Block for Tool Use ID toolu_013UyW5GhFet72wyp1nt5NrC #5713 (feedback ID: 2cd49952-e215-4e23-9f7e-ecbbcb0e2d6b, tool ID: toolu_013UyW5GhFet72wyp1nt5NrC)
• API Error 400 (invalid_request_error) on follow-up message during parallel sub-agent plan execution #5747 (contains details and comprehensive reproduction steps; tool ID: toolu_01Qu2dmLfdZPZRMYT4ntdMgG)
• Tool Use Block Missing Corresponding Tool Result Block  API Error: 400 #5765 (feedback ID: 64b3c820-a92f-4f83-bd5e-59a2645e0503, tool ID: toolu_014fEC2oCHupbJiNAK43yLQp)
• Tool Use Request Missing Corresponding Tool Result Blocks #5928 (feedback ID: 6808c3d8-7d28-4016-b90e-628b676b4666, tool ID: toolu_01VMttWDJu2L9onCw1ddoLQJ)
• Missing Tool Result Block in Anthropic API Request #6348 (feedback ID: bfd09f21-abd5-4541-b003-1becd0001964, tool ID: toolu_01QuCm4cWTJYDtxkqiqheNe3)

Related Issues (9):

• Web Search Failure: Persistent API Timeout During Search Request #1608
• Based on the context, it seems like there was an issue attempting to retrieve documentation or research materials about Claude's prompt engineering. Without more specific details about the exact problem, I'll generate a generic but technically precise issu #1672
• Invalid Tool Result Block for Pending Tool Use #2464
• "Workflow Interruption: Unable to Continue Working" This title captures the core issue of being unable to proceed with work, using technical language that suggests a workflow or process problem. It's concise, descriptive, and highlights the key problem fo #2582
• Missing Tool Result Block for Tool Use ID toolu_017ftsPrhKfL8GqWRXXoKbRu #2600
• Issue Title: Tool Use Block Missing Corresponding Tool Result Block This error typically occurs in conversational AI contexts when a tool use request is not immediately followed by its corresponding tool result block. The specific causes and resolution st #2616
• I apologize, but your message seems incomplete or unclear. Could you provide more details about the specific error message or issue you're experiencing? To help generate a precise GitHub issue title, I would need: 1. What specific error occurred? 2. In wh #2627
• Invalid Tool Result Block: Missing Corresponding Tool Result After Tool Use #2672
• Claude Code: constantly seeing 'API Error (Request timed out...)' - Retrying in .. seconds.. (attempt x/10)' #2728