Expired50% confidenceFactTime unknown
When an MCP Server initializes, it injects all tool descriptions into the context as system prompts, persistently occupying input Token quota for every request
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
MCP vs CLI: 40x Token Cost Difference — How AI Engineers Should Choose
bilibili李太白阿白
Related Claims
UnverifiedThe scalability problem with MCP is that the name, description, and schema of each tool must be placed in the system prompt, and 20 servers with 15 tools each would occupy most of the context window.77% similarPartially VerifiedMCP servers add tool definitions to the context window even when the user is not using those tools.76% similarUnverifiedMCP enables service discovery through a standardized tools/list interface, allowing clients to automatically retrieve the metadata (name, description, parameter schema) of all tools registered on the server.75% similarUnverifiedMCP's design philosophy is full registration — tool descriptions from all servers are injected into the context all at once during session initialization.74% similarUnverifiedMCP Host在向大模型发送用户问题时，会同时附带已注册的所有Tool列表，由大模型决定是否调用工具74% similar
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