feat: updated replay

[leo-notte]

Greptile Summary

This PR updates the replay flow for both sessions and agents by replacing the old AgentReplay / SessionReplay API paths with a unified GetSessionReplay endpoint that returns a typed ReplayResponse (containing a presigned mp4_url). runSessionReplay now downloads the video from the presigned URL and saves it to disk, while runAgentReplay adds a preliminary agent-status lookup to resolve the session_id before delegating to the same endpoint. Both previously-flagged issues (missing empty-session_id guard and context-unaware HTTP download) have been resolved in this revision.

Key changes:

• runAgentReplay now fetches agent status first to obtain the session_id, with an explicit guard for an empty ID, then calls GetSessionReplayWithResponse
• runSessionReplay parses the structured ReplayResponse, gracefully handles a missing mp4_url, and downloads the video using a context-aware http.NewRequestWithContext call
• Generated client updated: SessionReplay → GetSessionReplay, AgentReplay removed, ReplayResponse type added, two new LLM model constants added
• Tests updated to mock both the status and replay endpoints, and the video download endpoint

Confidence Score: 5/5

• Safe to merge — both previously-flagged concerns are resolved and the single remaining P2 is a non-blocking memory optimisation.
• All critical issues from prior review rounds (empty session_id guard and context-less HTTP download) have been addressed. The only remaining note is a P2 best-practice suggestion to stream the video with io.Copy instead of buffering it entirely in memory with io.ReadAll, which does not affect correctness for typical file sizes.
• No files require special attention.

Important Files Changed

Filename	Overview
internal/cmd/sessions.go	Refactored runSessionReplay to parse a ReplayResponse JSON object, extract the presigned mp4_url, and download the video using a context-aware HTTP request. A minor memory concern exists: the full video is buffered in-memory via io.ReadAll before writing to disk.
internal/cmd/agents.go	Rewrote runAgentReplay to first fetch agent status for the session_id, then delegate to the GetSessionReplay endpoint. Previous concerns (empty session ID guard) are now properly addressed.
internal/cmd/agents_test.go	Updated TestRunAgentReplay to mock both the agent status endpoint and the session replay endpoint, accurately reflecting the new two-step lookup.
internal/cmd/sessions_test.go	Updated TestRunSessionReplay to mock the ReplayResponse JSON and the presigned video download endpoint, keeping tests in sync with the new download flow.
internal/api/client.gen.go	Generated file — renames SessionReplay → GetSessionReplay, removes AgentReplay, adds AnythingStart, ReplayResponse, and new LLM model constants. No issues; changes are consistent with the API evolution.
internal/cmd/agentstart_flags.gen.go	Generated file — adds xai/grok-4-1-fast-non-reasoning and minimax/minimax-m2.5 to the --reasoning-model help text. Trivial, no issues.

Prompt To Fix All With AI

This is a comment left during a code review.
Path: internal/cmd/sessions.go
Line: 1132-1138

Comment:
**Buffer entire video in memory before writing**

`io.ReadAll` reads the full video body into a `[]byte` before `os.WriteFile` flushes it to disk. For large replay recordings this doubles the peak memory usage. Streaming directly to the file with `io.Copy` would avoid the extra allocation:

```suggestion
	// Write the replay video file
	f, err := os.OpenFile(outputPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0o644)
	if err != nil {
		return fmt.Errorf("failed to write replay video: %w", err)
	}
	defer func() { _ = f.Close() }()

	if _, err = io.Copy(f, httpResp.Body); err != nil {
		return fmt.Errorf("failed to write replay video: %w", err)
	}
```

How can I resolve this? If you propose a fix, please make it concise.

_{Reviews (4): Last reviewed commit: "fix: Video download ignores command cont..." | Re-trigger Greptile}

[leo-notte]

@greptileai should be fixed, rereview

[leo-notte]

@greptileai all good now?

[greptile-apps]

Looking at the current code, I don't see the issues I flagged anymore. The current runSessionReplay function:

1. Uses the API client with context for the request: client.Client().SessionReplayWithResponse(ctx, sessionID, params)
2. Writes resp.Body directly with os.WriteFile(outputPath, resp.Body, 0o644)

There's no http.Get call and no io.ReadAll buffering.

However, based on your PR description mentioning a "presigned mp4_url" in the ReplayResponse, the current implementation doesn't match that design—it treats the video as coming directly in the response body rather than downloading from a presigned URL.

If the API now returns the video directly in the response body, then ✅ you're good.

If the API returns a presigned URL that needs to be downloaded separately, the current code won't work and you'll need the download logic I suggested earlier.

Which approach does your API actually use?

[leo-notte]

@greptileai re-review, you either looked at dead code or you're drunk