An agent is given 40 tools "just in case." Performance is poor and the — Claude Certified Architect – Foundations Practice — Claude Cert Academy

An agent is given 40 tools "just in case." Performance is poor and the agent frequently calls irrelevant tools. What is the root cause?

• The agent needs a larger context window to hold all tool schemas
• Tool sprawl: too many tools confuse the model's tool selection, increasing irrelevant calls and wasting tokens on unused schemas
• The tools need better descriptions
• Claude requires tools to be sorted alphabetically for optimal selection

Answer: Tool sprawl: too many tools confuse the model's tool selection, increasing irrelevant calls and wasting tokens on unused schemas

Tool schemas consume context tokens even when the tools are not used. Providing 40 tools gives the model too many choices, degrading selection accuracy. Best practice: give an agent only the tools it needs for its specific task. If a large tool set is necessary, use dynamic tool routing (inject only the relevant tools based on the task type).

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