Blazor LLM Kit Reasoning

Updated on Aug 13, 2026

The Reasoning component renders a collapsible block that exposes the agent's raw thinking process — its inner monologue or scratchpad content. Use the component to give users visibility into how the agent approaches a problem before it takes action.

Content inside the Reasoning block streams in progressively as the agent thinks, and the block can be marked as completed once the reasoning phase finishes.

Creating Blazor Reasoning

To use the Reasoning component:

1. Add the <TelerikReasoning> tag.
2. Set Label to a string such as "Thinking" or "Thought".
3. Define a <ContentTemplate> child template with the agent's reasoning text.
4. (optional) Set Expandable and Expanded to control collapsibility.
5. (optional) Set Completed to mark the reasoning phase as finished.
6. (optional) Set SecondaryLabel to display metadata such as duration.

Completed Reasoning block showing agent scratchpad content

<TelerikReasoning Label="Thought"
                  SecondaryLabel="for 5s"
                  Expandable="true"
                  @bind-Expanded="@IsExpanded"
                  Completed="true">
    <ContentTemplate>
        <p>I need to sum revenue per customer for Q1 2025 and return the top 5 results ordered descending.</p>
        <p>I'll use query_database with a GROUP BY on customer_name and limit to 5 results.</p>
    </ContentTemplate>
</TelerikReasoning>

@code {
    private bool IsExpanded { get; set; } = true;
}

Reasoning API

Get familiar with all Reasoning parameters, templates, and events in the Reasoning API Reference.

Next Steps

• ChainOfThought
• ToolCall

See Also

• LLM Kit Overview
• Reasoning API Reference