I have observed something in claude sonnet 3.5 for 1 week.
there is a regression in his intelligence. he gives wrong answers to the questions I ask, when I say analyze the project, he analyzes it, but his explanations are short. when I say compare files, instead of comparing, he reads a few files and explains only the working logic of the file… etc. i see many errors like this. he was not like this before. he had a more intelligent structure, offering suggestions, detecting errors in the file without me saying so. is it just me or are there others who have made the same observation as me?
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yeah i think i figured out why this was happening. i turned off the mcp server i was using for the sequential thinking method and then tried again. claude continued to work normally as before.
be careful with the mcp servers you are using. they can prevent the system from running stable.
It never is Claude to begin with, if anything its cursor as they cripple the history server side to preserve costs.
That MCP server works wonders, as long your context stays intact. 
my problem was fixed after replacing the mcp server with a new one.
What is MCP server?
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modelcontextprotocol/servers: Model Context Protocol Servers
at first i was using the sequential thinking mcp server here. then after i had the situation i mentioned above, when i turned off the mcp server and tried it, it actually worked normally. then i found another sequential thinking mc server and installed it. when i installed it, there was no problem and i got better results.
this is the mcp server I am using now (actually I used this one at first but I replaced it with this one thinking maybe the other one is better. but I was wrong.)
An adaptation of the MCP Sequential Thinking Server to guide tool usage. This server provides recommendations for which MCP tools would be most effective at each stage.i’m here at loss a bit. how does this work ? doc are not clear.
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I don’t understand your question.
are you wondering how the mcp server I installed works?
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I didn’t add the MCP server, but in doing so, the AI models still became very stupid.
Yeah, I did little bit digging and it is actually good. Browseruse tool is actually very good at debugging.