XS✔ ◾ ✨ Custom prompts - Default built-in MCP servers to selected

[Copilot]

0. AI Development - Prompt & Model (include prompts/models used or N/A)

GitHub Copilot (claude-sonnet-4-5)

1. What triggered this change? (PBI link, Email Subject, conversation + reason, etc)

Users had to manually re-select built-in MCP servers every time they created a new custom prompt — repetitive and easy to miss, causing prompts to run without intended tools.

2. What was changed?

src/shared/utils/mcp-utils.ts (new)

• Extracted getBuiltinServerIds(servers) — pure utility that filters built-in server IDs from a config list

src/shared/utils/mcp-utils.test.ts (new)

• Regression tests: normal case, no built-ins, empty list, missing IDs edge case

src/ui/src/components/settings/custom-prompt/PromptForm.tsx

• New prompts: useEffect pre-selects built-in server IDs on load (shouldDirty: false)
• Existing prompts with selection: missing built-in IDs are silently merged in without marking the form dirty
• Existing prompts with no selection: existing behaviour preserved (select all)
• Rendering: built-in server checkboxes are always checked and disabled — isCheckboxDisabled = isDefault || isBuiltin || isServerDisabled. The (Disabled) label now only appears for enabled === false servers, not built-ins

const isBuiltin = server.builtin ?? false;
// Built-in servers are always checked and cannot be deselected
const isChecked = isBuiltin || (field.value?.includes(server.id) ?? false);
const isCheckboxDisabled = isDefault || isBuiltin || isServerDisabled;

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✏️

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>✨ Custom prompts - Default built-in MCP servers to selected</issue_title>
<issue_description>Cc: @calumjs @ricksu978 @adamcogan
Hi YakShaver team

Pain

When users create a new custom prompt, they must manually re-select the built-in MCP servers each time. This is repetitive and easy to miss, leading to prompts running without the intended context/tools.

Suggested Solution

When adding a new custom prompt, default the built-in MCP servers to "selected".

Acceptance Criteria

1. Creating a new custom prompt defaults all built-in MCP servers to selected.
2. Users can still unselect built-in MCP servers before saving the prompt.
3. Existing custom prompts are not modified unless the user edits them.

Tasks

• Identify the source of truth for “built-in MCP servers” in the app.
• Update the “Add new custom prompt” flow to default built-in MCP servers to selected.
• Add a regression test to ensure the default selection is applied on new prompts.

More Information

Requested feature: "inside the custom prompt, when the user adds a new prompt, we should make the built-in MCP servers selected by default".

Screenshots

Thanks!
</issue_description>

<agent_instructions>These built in tools should be auto selected and can't be modified from ui</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes ✨ Custom prompts - Default built-in MCP servers to selected #768

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[github-actions]

PR Metrics

✔ Thanks for keeping your pull request small.
✔ Thanks for adding tests.

	Lines
Product Code	120
Test Code	136
Subtotal	256
Ignored Code	-
Total	256

Metrics computed by PR Metrics. Add it to your Azure DevOps and GitHub PRs!

[github-actions]

🚀 Pre-release build is available for this PR:
https://github.com/SSWConsulting/SSW.YakShaver.Desktop/releases/tag/0.6.0-beta.770.1773219236

[github-actions]

🚀 Pre-release build is available for this PR:
https://github.com/SSWConsulting/SSW.YakShaver.Desktop/releases/tag/0.6.0-beta.770.1773220681

[Copilot]

Pull request overview

This PR improves the custom prompt editor UX by automatically selecting built-in MCP servers by default (and keeping them selected), reducing the chance of running prompts without intended built-in tools. It also factors MCP server selection helpers into shared utilities with unit tests.

Changes:

• Added shared MCP selection utilities (getBuiltinServerIds, getConnectedOrBuiltinIds, ensureBuiltinServerIds) plus tests.
• Updated PromptForm to pre-select built-in servers for new prompts and to merge missing built-ins into existing selections.
• Adjusted prompt submit validation + UI messaging around disabled/disconnected servers and “no servers configured” states.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

File	Description
src/ui/src/components/settings/custom-prompt/PromptForm.tsx	Defaults/locks built-in server selection; adjusts validation and UI copy for server selection.
src/shared/utils/mcp-utils.ts	Introduces shared helper functions for built-in/connected server ID selection and merging.
src/shared/utils/mcp-utils.test.ts	Adds vitest coverage for the new shared MCP utilities.
src/backend/services/mcp/mcp-server-manager.ts	Prevents “builtin” flagged entries from the external/stored list being merged as externals.

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[github-actions]

🚀 Pre-release build is available for this PR:
https://github.com/SSWConsulting/SSW.YakShaver.Desktop/releases/tag/0.6.0-beta.770.1773222497

[github-actions]

🚀 Pre-release build is available for this PR:
https://github.com/SSWConsulting/SSW.YakShaver.Desktop/releases/tag/0.6.0-beta.770.1773224096

[github-actions]

✅ Automated Release Created Successfully

Release Details:

• Version: 2026.3.12-BUILD.170.2645c36
• Tag: 2026.3.12-BUILD.170.2645c36
• Release: https://github.com/SSWConsulting/SSW.YakShaver.Desktop/releases/tag/2026.3.12-BUILD.170.2645c36

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