claude code errors if name of MCP tool is too long, such as mcp__plugin_chrome-devtools-mcp_chrome-devtools__get_console_message

[xpacificsoda]

The problem primarily occurs with custom or MCP tools where the naming scheme appends prefixes or unique identifiers (like UUIDs or MD5 hashes) to the original tool name. The resulting string, often in the format mcp__[server_name]__[tool_name], frequently surpasses the 64-character limit. In my case, claude failed to invoke "mcp__plugin_chrome-devtools-mcp_chrome-devtools__get_console_message" for its name exceeding the length limit.

So could you shorten the name of tools or event the name of chrome-devtools-mcp inside the plugin?

[Lightning00Blade]

Hello,

It seems to be an issue with Claude Code as multiple people have reported this issue with different MCPs
Ref: anthropics/claude-code#21136
As you say they are using compounding name (prefix + mcp name + tool name + suffix), most likely to avoid clashes between MCPs.

From our point of view this a API issue on their end. Our MCP follows the spec and provides tool names under 128 chars.
From my understanding if we change the name to something less descriptive it won't get called as often, so sadly there is nothing we can do on our end that would fix it.
We follow the MCP spec which has a limit of 128 and that is for the tool name only (get_console_message).

I will keep this open for a short time if anyone else has the same issue.

[NickNYU]

To summary, I raised a PR to fix this: #1185

same issue that occurs to Claude code with AWS Bedrock:

API Error: 400 {"detail":"400: Message: AWS client error encountered: <class
     'botocore.errorfactory.ValidationException'>: An error occurred (ValidationException) when calling the Converse
      operation (reached max retries: 0): 9 validation errors detected: Value
     'mcp__plugin_chrome-devtools-mcp_chrome-devtools__get_console_message' at
     'toolConfig.tools.42.member.toolSpec.name' failed to satisfy constraint: Member must have length less than or
     equal to 64; Value 'mcp__plugin_chrome-devtools-mcp_chrome-devtools__get_network_request' at
     'toolConfig.tools.43.member.toolSpec.name' failed to satisfy constraint: Member must have length less than or
     equal to 64; Value 'mcp__plugin_chrome-devtools-mcp_chrome-devtools__lighthouse_audit' at
     'toolConfig.tools.46.member.toolSpec.name' failed to satisfy constraint: Member must have length less than or
     equal to 64; Value 'mcp__plugin_chrome-devtools-mcp_chrome-devtools__list_console_messages' at
     'toolConfig.tools.47.member.toolSpec.name' failed to satisfy constraint: Member must have length less than or
     equal to 64; Value 'mcp__plugin_chrome-devtools-mcp_chrome-devtools__list_network_requests' at
     'toolConfig.tools.48.member.toolSpec.name' failed to satisfy constraint: Member must have length less than or
     equal to 64; Value 'mcp__plugin_chrome-devtools-mcp_chrome-devtools__performance_analyze_insight' at
     'toolConfig.tools.52.member.toolSpec.name' failed to satisfy constraint: Member must have length less than or
     equal to 64; Value 'mcp__plugin_chrome-devtools-mcp_chrome-devtools__performance_start_trace' at
     'toolConfig.tools.53.member.toolSpec.name' failed to satisfy constraint: Member must have length less than or
     equal to 64; Value 'mcp__plugin_chrome-devtools-mcp_chrome-devtools__performance_stop_trace' at
     'toolConfig.tools.54.member.toolSpec.name' failed to satisfy constraint: Member must have length less than or
     equal to 64; Value 'mcp__plugin_chrome-devtools-mcp_chrome-devtools__take_memory_snapshot' at
     'toolConfig.tools.58.member.toolSpec.name' failed to satisfy constraint: Member must have length less than or
     equal to 64. Response body: {'Error': {'Message': \"9 validation errors detected: Value
     'mcp__plugin_chrome-devtools-mcp_chrome-devtools__get_console_message' at