JuliusBrussee/caveman · error

cachebench: unsupported trace provider %q

Error message

cachebench: unsupported trace provider %q

What it means

Error "cachebench: unsupported trace provider %q" thrown in JuliusBrussee/caveman.

Source

Thrown at cacheengine/cachebench/trace.go:167

			messages = append(messages, bedrockMessage(message))
		}
		body = map[string]any{
			"system":     []any{map[string]any{"text": systemText}},
			"toolConfig": map[string]any{"tools": []any{map[string]any{"toolSpec": map[string]any{"name": "workspace", "description": toolsText, "inputSchema": map[string]any{"json": map[string]any{"type": "object"}}}}}},
			"messages":   messages, "inferenceConfig": map[string]any{"maxTokens": 256},
		}
	case "gemini":
		contents := make([]any, 0, len(history))
		for _, message := range history {
			contents = append(contents, geminiMessage(message))
		}
		body = map[string]any{
			"systemInstruction": map[string]any{"parts": []any{map[string]any{"text": systemText}}},
			"tools":             []any{map[string]any{"functionDeclarations": []any{map[string]any{"name": "workspace", "description": toolsText, "parameters": map[string]any{"type": "object"}}}}},
			"contents":          contents, "generationConfig": map[string]any{"maxOutputTokens": 256},
		}
	default:
		return nil, fmt.Errorf("cachebench: unsupported trace provider %q", provider.Provider)
	}
	return json.Marshal(body)
}

func anthropicMessage(message agentMessage) map[string]any {
	switch message.Kind {
	case "assistant_tool":
		return map[string]any{"role": "assistant", "content": []any{map[string]any{
			"type": "tool_use", "id": fmt.Sprintf("call-%03d", message.Turn), "name": "workspace", "input": map[string]any{},
		}}}
	case "tool_result":
		return map[string]any{"role": "user", "content": []any{map[string]any{
			"type": "tool_result", "tool_use_id": fmt.Sprintf("call-%03d", message.Turn), "content": message.Text,
		}}}
	default:
		return map[string]any{"role": "user", "content": message.Text}
	}
}

View on GitHub (pinned to 27d5a3981a)

Solutions

1. Use a supported trace provider.

When it happens

Trigger: Thrown at cacheengine/cachebench/trace.go:167 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of JuliusBrussee/caveman@27d5a3981a (2026-08-15). Data as JSON: /api/errors/12403fb0dcf86d1a. Report an issue: GitHub.