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MCP Prompt flow is canceled if I don't enter an optional argument #251803

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@kblok

Description

@kblok

Type: Bug

I have an MCP tool with a prompt. That prompt has an optional argument (URL). When I select that prompt, I get a dialog requesting that URL. But if I don't enter that URL and press Enter, the dialog gets closed, and I don't get the prompt.

Image

VS Code version: Code 1.101.0 (dfaf441, 2025-06-11T15:00:50.123Z)
OS version: Darwin arm64 24.5.0
Modes:

System Info
Item Value
CPUs Apple M4 Pro (14 x 2400)
GPU Status 2d_canvas: enabled
canvas_oop_rasterization: enabled_on
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_graphite: enabled_on
video_decode: enabled
video_encode: enabled
webgl: enabled
webgl2: enabled
webgpu: enabled
webnn: disabled_off
Load (avg) 3, 3, 4
Memory (System) 24.00GB (0.11GB free)
Process Argv /Users/dario/Code/mabl/mabl-cli --crash-reporter-id 309bc9cc-116f-41cd-ab5a-2167d02c49a3
Screen Reader no
VM 0%
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(2 theme extensions excluded)

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