Adding new DesktopAgent action - CursorTrail

[TalZaccai]

Adding a new CursorTrail action that enables/disables the retro Windows mouse cursor trail effect and lets users control its length.

What it does

• Enables or disables cursor trails via SystemParametersInfo(SPI_SETMOUSETRAILS, ...)
• Supports an optional length parameter (valid range: 2–12)
• Shows an informative message if the user provides an out-of-range value

User phrases

• "enable mouse trail" / "turn on cursor trail"
• "disable mouse trail" / "turn off cursor trail"
• "set cursor trail length to 10" / "cursor trail 5"

Grammar test fix

The grammar test script (test-grammar-matching.mjs) was only loading desktopSchema.agr, so test cases
for actions defined in sub-grammars (display, taskbar, input, privacy, etc.) were silently failing with "NO MATCH".
Updated the script to read manifest.json and load all declared sub-grammars automatically. This fixes 28 previously
broken test cases and ensures new sub-grammar actions like CursorTrail are actually validated.

[Copilot]

Pull request overview

Adds a new Windows DesktopAgent CursorTrail input action that toggles the retro cursor trail effect and optionally sets the trail length, wiring it through the TS grammar/schema layer, the TS connector message payload, and the .NET AutoShell handler that calls SystemParametersInfo(SPI_SETMOUSETRAILS, ...).

Changes:

• Extend the Windows input grammar to recognize cursor-trail enable/disable and “set length” utterances.
• Add a CursorTrailAction to the TS input action schema and handle it in the TS connector (including clamping/notes for out-of-range lengths).
• Add a new .NET AutoShell command handler to apply the setting via SystemParametersInfo(SPI_SETMOUSETRAILS, ...).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
ts/packages/agents/desktop/src/windows/inputSchema.agr	Adds <CursorTrail> grammar rule and routes it to the CursorTrail action.
ts/packages/agents/desktop/src/windows/inputActionsSchema.ts	Introduces CursorTrailAction type and includes it in DesktopInputActions.
ts/packages/agents/desktop/src/connector.ts	Adds CursorTrail case to serialize parameters + produce a confirmation message (with clamping behavior).
dotnet/autoShell/AutoShell.cs	Routes CursorTrail command key to the new settings handler.
dotnet/autoShell/AutoShell_Settings.cs	Implements HandleMouseCursorTrail and adds SPI_SETMOUSETRAILS constant.

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.

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[robgruen]

Can we update the readme with this new action please.

[robgruen]

❤️ it.
See my readme comment.