request-frame-preview

When debugging a DeepSeek Harness agent session, the most common question is simple: what exactly did the model receive? request-frame-preview answers that by reconstructing the full request frame Harness sends upstream—the system prompt, tool declarations, and the ordered message array—so you can inspect every byte the model actually saw.

Click the Request Preview button in the session header to open an overlay with three stacked sections: the (collapsed by default) system prompt, tool declarations with expandable parameter schemas, and the message list with user / assistant / tool-result chips, tool_call_ids, reasoning content, and inline tool_calls. A Download JSON button saves the entire frame to a file for offline diffing or pasting into a ticket.

For live sessions the data comes from the same functions the agent loop reads when building each request; for cold sessions it falls back to the durable log. The HTTP endpoint is strictly read-only (GET/HEAD), stores nothing, and mutates no session state—it is a pure debugging aid.

Built for developers and platform engineers who are tuning prompts, triaging tool-call failures, or need to explain to a teammate why the model made a particular decision. If you have ever grep-d your way through session logs trying to reconstruct message order or manually splice role: tool blocks, this plugin saves you the tedium.