# Mohit follow-up evidence — 2026-08-07

## Environment
- Cursor IDE: 3.15.6 (commit a1f686545fd0ce8917bbd2449f733551a9bce420) — upgraded since original 3.13.21 report
- OS: Darwin arm64 25.5.0
- machineId: 45f9fb3f-e7a9-4793-a235-3a7bb93e4e3f
- Log session folder: ~/Library/Application Support/Cursor/logs/20260807T093902/
- Home/empty-window agent chat: composerId d3a4b88c-acd1-4156-94f4-9740ae500454
- Privacy / data sharing: ON

## Q1: browser_navigate with newTab:true as first browser call?
FAILS with server-not-found. Exact agent error at ~15:47 local:

  Error: MCP server does not exist: cursor-ide-browser. Available servers: cursor-app-control, plugin-aws-serverless-aws-serverless-mcp, plugin-supabase-supabase, plugin-svelte-svelte, plugin-vercel-vercel, user-Astro docs, user-cloudflare-docs, user-family-memory

GetMcpTools({pattern:'cursor-ide-browser|browser_navigate'}) returned zero matches in the same turn.
Reload Window / newTab:true did not restore live registration for this chat.

## Q2: lease returned 0 tools… OR lease showing tools but CallMcpTool still fails?
Both patterns appear in this session; the failing CallMcpTool matches the SECOND:

### At failing CallMcpTool (~15:47) — lease has tools, browser gone
From Mcp FileSystem Writer.workspaceId-be144a62… (window1_wb43), last events before the fail:

  15:43:34 — lease returned 128 tools across 9 clients; Incremental write adds cursor-ide-browser toolCount=16
  15:44:45 — lease returned 112 tools across 8 clients
  15:44:45 — Server "cursor-ide-browser" left the lease, scheduling directory removal
  15:44:45 — Incremental write removes cursor-ide-browser; totalServerCount=8 (other MCPs remain)

So at CallMcpTool time: lease is NOT empty (112 tools / 8 clients) but cursor-ide-browser has already left → agent runtime returns server-not-found.

### Also present: lease returned 0 tools across 0 clients (cold/wb churn)
Example window1_wb50 @ 15:38:58:

  15:38:58.103 — fetchAndWrite: lease returned 0 tools across 0 clients
  15:38:58.118 — Incremental write removes 9 servers including cursor-ide-browser (totalServerCount=0)
  15:38:58.244 — recovers: cursor-ide-browser toolCount=16 (among others)
  15:39:05.879 — Server "cursor-ide-browser" left the lease again

## Session-wide counts in 20260807T093902
- "Server \"cursor-ide-browser\" ... left the lease" events: 144
- "lease returned 0 tools across 0 clients" events: 47

## Flavor localization note
This looks like Rohan's flavor (tools present briefly then leave the lease) more than a pure empty-lease-at-submit window — though empty-lease blips also occur during workbench churn.