Pattern catalog
Pattern · tool-router
Agent tool / skill router
Keywords: tool, agent, skill, function call, route to, which api
Jev questions
selected_tool · choice
Which tool should handle this request? (router supports up to 182 registered tools)
tool_needed · noul
Does this request need a tool?
Who owns what
Code
- Validate tool arguments against JSON schema in code
- Fall back to a direct answer on none_of_above in code
Jev
- selected_tool as Choice
- tool_needed as Noul
LLM
- Draft the final user-facing message from tool output
Guard: if (!tool_needed) answerDirectly(); else callTool(selected_tool);