# Session Checkpoint: FlowStudio MCP v0.6.3 Testing
**Session ID:** 59a77263-622a-4e1f-8bbb-b76202273942  
**Date:** May 7, 2026  
**Status:** Ready for verification & ship decision

## Key Topics Saved

### 1. CANCELLATION TOKEN REQUIREMENT (Critical Fix)
- **Issue:** VS Code extension showing persistent "in progress" spinner when resolving MCP servers
- **Root Cause:** Missing CancellationToken support in resolveMcpServerDefinition handler
- **Solution:** Token-aware resolve implementation
- **Status:** v0.6.3 implements this fix with hard-timeout pattern

### 2. HARD-TIMEOUT PATTERN (Fallback Safety)
Two-tier cancellation:
- Primary: CancellationToken-aware resolve listens to VS Code cancellation
- Fallback: Hard timeout (5-second absolute limit) if token doesn't fire
- Codex upgrade provided robust timeout management

### 3. v0.6.3 CLEAN BOOTSTRAP
```
[bootstrap] probe OK "FlowStudio" (HTTP 200)
[bootstrap] probe OK "OA 2.1" (HTTP 200)
[bootstrap] probe OK "Test2" (HTTP 200)
```
All 3 servers probed successfully in <2 seconds, correctly mirrored to Copilot CLI.

### 4. BOOTSTRAP VS RESOLVE PHASES
- **Bootstrap:** Runs at startup, executes with current autostart settings
- **Resolve:** Lazy phase, only invoked when Copilot Chat needs an MCP server
- **With chat.mcp.autostart: "never":** Bootstrap completes, resolve fires only on first Flow Studio query
- **Expected:** No [resolve] probe lines until user triggers Chat

## Ship Readiness Checklist

Test 1: Check if "in progress" indicator is gone (symptom of original hung handshake issue)
Test 2: Trigger Copilot Chat with Flow Studio query, verify [resolve] probe OK lines appear

If both pass: Ready to ship → commit → push → marketplace
If either fails: Additional investigation needed

