VibeChat Build Pipeline — Real Implementation (2026-08-19 19:50 CEST)

Status: Code complete, deployed, tests running in background. Pending: extensive test results + commit.

Operator directive: "do the bigger pipeline then more extensive tests."

What changed (5 fixes, all in legacy-toggle worktree)

Fix 1: `reasoning_content` handler in `src/agent/providers.ts`

• **Problem**: Z.AI `glm-4.5-flash` streams `delta.reasoning_content` for 50-80% of chunks, but the parser only emitted events for `delta.content` and `delta.tool_calls`. The agent appeared to freeze for 30+ seconds while the model reasoned.
• **Verified empirically**: Direct Z.AI test shows 498 chunks for a 5-word-sentence prompt — 51 are `reasoning_content` + 13 are `content` + 1 tool_call.
• **Fix**: Added new `StreamEvent` variant `{ type: 'reasoning'; delta: string }`. Parser yields reasoning as it arrives.

Fix 2: `build_freshvibe_app` real implementation in `src/agent/tools.ts`

• **Problem**: The tool was a stub that returned `success: true` in 0ms with text "Build started... execution is automatic" but **did not write any files, save any annotation, or trigger any build pipeline**. Day 10dd's port left it as a string return.
• **Root cause**: There's no `/api/agent/build_freshvibe_app` endpoint on the bridge. The bridge has 77 endpoints (per `bridge-server/server.cjs`); the agent was supposed to use `write_file` directly per `/opt/vibecoder-bridge/bridge-server/build-pipeline.md`.
• **Fix**: The tool now:

1. Sanitizes appName to lowercase-hyphens

2. For each file: {name, content} in the args, calls POST /api/agent/write_file with workspaceRoot: "/var/www/freshvibeapps/clients" and path: "<appName>/<file>"

3. The bridge's write_file handler auto-creates the directory, auto-creates the symlink at /var/www/freshvibeapps/clients/vibecoder/<appName>, and serves the app at https://vibecoder.freshvibeapps.com/<appName>/

4. Returns ✅ build_freshvibe_app <appName> (summary) — wrote N/M files. Live URL: <url>

• **Bonus**: Auto-creates a root-level `index.html` that redirects to `public/` if there's a `public/index.html` (v8 thin-rendering-layer support).

Fix 3: Stack traces in error handler in `src/host/vibechat-panel.js`

• **Problem**: The catch block only showed `err.message`, never `err.stack`. The "e is not iterable" error was useless for debugging.
• **Fix**: Now shows `errName`, `errMessage`, and first 8 lines of `errStack`. Also calls `console.error('[VibeChat agent error]', err)` so browser DevTools shows the full error.

Fix 4: `reasoning` event handler in panel

• **Problem**: Even with the parser fix, the panel ignored `reasoning` events.
• **Fix**: When the agent yields `reasoning` events, the panel shows them as a 💭 bubble (truncated to 2000 chars to avoid memory bloat). The user sees real-time "thinking..." text instead of a freeze.

Fix 5: Auto-preview on `write_file` to a FreshVibe app dir

• **Problem**: The panel only dispatched `fv:vc-preview` on `build_freshvibe_app` success. If the model used `write_file` directly (no `build_freshvibe_app` call), the app would be live but not previewed.
• **Fix**: When the panel sees a `write_file` tool_call with `workspaceRoot: "/var/www/freshvibeapps/clients"` and `path: "<appName>/<file>"`, it extracts the appName. After the write_file tool_result returns success, the panel dispatches `fv:vc-preview` with the appName (debounced — only once per app per turn).

Build + deploy

• Bundle: `main-Bwi-wIG0.js` (748KB) + `main-CJ0zLOGG.css` (254KB)
• Deployed to `/var/www/freshvibeapps/clients/vibecoder/` on VPS
• All 1155 chunk assets synced

Extensive test suite (running in background)

5 prompts covering different categories:

• **Basic landing**: 1-file HTML with hero + button + footer
• **Multi-page (3 files)**: index.html, about.html, contact.html
• **Read + modify**: ask the agent to read an existing app and summarize
• **Search + read**: ask the agent to search a workspace for "todo"
• **End-to-end build**: 3-file build (HTML+CSS+JS) with `build_freshvibe_app`

Each test:

• Fresh thread (clean state)
• 90s timeout
• Captures: messages, reasoning events, tool calls, app browser state, preview overlay, iframe, bridge API calls, page errors
• Saves screenshot to `/workspace/verify-test-N.png`
• Results saved to `/workspace/extensive-test-results.json`

Files changed

• `src/agent/providers.ts` — added `reasoning` event type, handler for `delta.reasoning_content`
• `src/agent/core.ts` — added `reasoning` to `AgentEvent` union, yield reasoning events from `runAgent`
• `src/agent/tools.ts` — replaced `build_freshvibe_app` stub with real file-writing implementation
• `src/host/vibechat-panel.js` — handle `reasoning` events, show 💭 bubbles, surface stack traces, dispatch `fv:vc-preview` on `write_file` to a FreshVibe app dir

Branch state

• `legacy-toggle`: c117016 → 76017ec → 660e245 → 07c7a17 (in progress, PUSH pending)
• All work in `/workspace/vc-source.worktrees/legacy-toggle/`

Next steps

• Wait for extensive test suite to complete (up to 7-8 min)
• Review test results, fix any new bugs surfaced
• Commit + push to origin
• Write final audit doc with results
• Post final bulletin with verification evidence