I have seen ~10 IQ points drop with each MCP I added. I have replaced them all with either skill-like instructions or curl calls in AGENTS.md with much better "tool-calling" rate.
I have seen ~10 IQ points drop with each MCP I added. I have replaced them all with either skill-like instructions or curl calls in AGENTS.md with much better "tool-calling" rate.
That's a context pollution problem, not an MCP problem.
https://www.anthropic.com/engineering/advanced-tool-use
building a rag for searching correct MCP is a band-aid.
1. it's not just about MCP, if you have 100s of skills, you are going to have the same context issues
2. it was delegation to a subagent to select the tools that should be made available, which sounded like it got the whole list and did "rag" on the fly like any model would
You're going to want to provide your agent with search, rag, subagent context gathering (and pruning/compation/mgmt) that can work across the internet, code bases, large tool/skill sets, past interaction history. All of this can be presented as a single or few tools to your main agent and is the more meta-pattern/trend emerging