dsh-sseye

When running agents inside DeepSeek Harness, the most useful debugging question is often the simplest: what exactly did the model receive and return on this turn? The full system prompt, every message in the array, the tool schemas, each streaming chunk, the real wire protocol, the endpoint — none of it is visible in the normal UI. Reaching for mitmproxy works, but adding a CA, trusting a root certificate, and still losing agent-turn semantics makes the loop slow and error-prone.

dsh-sseye taps the harness-internal llm/stream waterfall directly, so every GenerateOptions object (system prompt, messages, tools, sampling params) and every response stream chunk pass through unchanged. Chunk identity, ordering, backpressure, and thrown errors are all preserved. Each capture is tagged with turn, step, session, and compaction attribution, classified by source (agent loop, compaction, session title, or other), and enriched with TTFT, total duration, token usage including cache-read, and finish reason. The real wire protocol and endpoint are resolved from the provider profile, with a clearly-marked fallback for routes that do not declare one.

The viewer is a DevTools-style panel docked in the right details column. Calls are grouped by turn with a collapsible header showing call count, in/out tokens, and total duration. Each row expands in place via an inline accordion, revealing the full detail: provider, model, protocol chip, endpoint, a stats grid with a cache-hit ratio bar, system prompt, messages, tool names, and response blocks. A first-degree context diff collapses the shared message prefix and highlights only the newly added content. Wire JSON reconstruction mirrors the DeepSeek adapter serialization, tool results expand to standalone role:tool messages, and reasoning replays as reasoning_content. Live streaming mode polls settling fields while a call is in flight, and JSON export is available per call or per turn bundle.

Built for developers who debug agent loops, compare multi-provider routing, trace compaction or tool-call regressions inside Harness. No proxy, no certificates, no extra service — install the plugin, restart, and the SSEye button appears in the session header, ready to open every model call like a browser DevTools panel.