Fix: Claude AI 'Tool Use Sequence Interrupted' Error

Experiencing the frustrating "Tool Use Sequence Interrupted: Missing Tool Result Block" error in Claude can be a major roadblock. This article breaks down the causes, provides a detailed explanation of the error, and offers step-by-step solutions to get Claude back on track. We'll explore the error's origins, examine the environment in which it occurs, and provide proven troubleshooting steps to resolve it. Whether you're a seasoned Claude user or just starting, this guide will equip you with the knowledge to tackle this issue effectively.

Understanding the Error: A Detailed Breakdown

The error message messages.255: 'tool_use' ids were found without 'tool_result' blocks immediately after indicates a problem in how Claude processes tool interactions. In essence, Claude expects a tool_result block immediately following a tool_use block. When this sequence is broken, the error arises, halting the process. This often occurs when there are network interruptions, VPN issues, or inconsistencies in the Claude context. The error often involves complex interactions, especially when using the -resume command to continue a previous conversation.

Let's dissect the key components of the error message:

• tool_use: This refers to a request Claude makes to use an external tool. For instance, Claude might need to access a search engine to gather information or use a calculator to perform a computation.
• tool_result: This is the outcome or response from the tool that Claude used. It's the information Claude needs to continue processing the request. The tool_result must directly follow the tool_use block.
• messages.255: This part of the error message indicates that the issue occurred around message 255 in the conversation history. While the specific number may vary, it helps pinpoint where the problem started.

Why does this happen?

Several factors can contribute to this error:

• Network Issues: Unstable internet connections, especially those with brief outages (like the reported < 1s outages with Starlink), can interrupt the communication between Claude and the external tool, preventing the tool_result from being received.
• VPN Problems: VPNs can sometimes interfere with network traffic, causing delays or incomplete data transfers. This is particularly true if the VPN server is experiencing issues or is located far from your actual location.
• Contextual Inconsistencies: Using the -resume command can sometimes lead to inconsistencies in the conversation context, especially if the previous session was interrupted or contained errors.
• Claude Bugs: Although less common, there could be underlying bugs in Claude's processing logic that trigger this error under specific circumstances.

Identifying the Problem Environment

To effectively troubleshoot this error, it's crucial to understand the environment in which it occurs. The provided information highlights several key aspects:

• Platform: darwin indicates the user is on macOS.
• Terminal: Apple_Terminal is the default terminal application on macOS.
• Version: 1.0.72 refers to the version of the Claude application being used.
• Feedback ID: c2aec1a9-6adc-42db-bf98-d193be52208c is a unique identifier for the specific error instance, which can be helpful for the Claude team to investigate further.

The user also reported trying multiple Claude accounts, suggesting the issue isn't tied to a specific account but rather to the environment or the specific conversation context.

Step-by-Step Solutions to Fix the "Tool Use Sequence Interrupted" Error

Now, let's dive into the solutions. We'll start with the simplest and most common fixes, progressing to more advanced troubleshooting steps.

1. Check Your Internet Connection

As the error often stems from network issues, the first step is to ensure you have a stable and reliable internet connection.

• Restart your router and modem: This is a classic but often effective solution. Power cycle your network devices to refresh the connection.
• Test your internet speed: Use a speed test website (https://www.speedtest.net/) to verify that your internet speed is within the expected range and that there are no significant packet loss or latency issues.
• Temporarily disable your VPN: VPNs can sometimes interfere with network traffic. Try disabling your VPN temporarily to see if it resolves the error. If it does, try a different VPN server or provider.
• Consider a wired connection: If you're using Wi-Fi, try switching to a wired Ethernet connection to eliminate potential wireless interference.

2. Clear Claude's Context and Start Fresh

If network issues aren't the culprit, the problem might lie in the conversation context.

• Avoid using -resume: The user reported that starting a new context without using -resume resolved the issue. This suggests that the error was related to the previous conversation history. Instead of resuming, start a completely new conversation.
• Clear Claude's cache (if possible): Some applications store cached data that can sometimes become corrupted. If Claude has a built-in option to clear the cache, try using it.

3. Simplify Your Prompts

Complex or ambiguous prompts can sometimes confuse Claude and lead to errors. Try simplifying your prompts to make them more straightforward.

• Break down complex tasks: Instead of asking Claude to do everything at once, break the task into smaller, more manageable steps.
• Be specific: Provide clear and unambiguous instructions. Avoid vague language or assumptions.
• Reduce the reliance on tools: If possible, try to rephrase your prompt to minimize Claude's need to use external tools.

4. Update Claude to the Latest Version

Using an outdated version of Claude can sometimes lead to compatibility issues and bugs. Ensure you're using the latest version of the application.

• Check for updates: Look for an