Measure Your MCP Server's Token Tax in 60 Seconds
A new audit script allows developers to measure the "token tax" associated with MCP server tool definitions, which consumes context budget before an agent performs any useful action. The author's analysis of the real @modelcontextprotocol/server-filesystemserver found 14 tools consumed 2,638 tokens, approximately 1.3% of a 200K context window. While this specific instance is small, the cumulative effect across multiple servers can lead to significant token usage, as indicated by Anthropic's internal figures of up to 134K tokens for a multi-server setup before optimization. AI
IMPACT Enables developers to better understand and manage the token costs associated with agent tool definitions, potentially optimizing performance and reducing expenses.