feat: enable componentManifest by default by yannbf · Pull Request #208 · storybookjs/mcp

yannbf · 2026-03-31T07:32:25Z

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changeset-bot · 2026-03-31T07:32:29Z

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Latest commit: d0c2848

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@storybook/addon-mcp	Minor

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netlify · 2026-03-31T07:32:31Z

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pkg-pr-new · 2026-03-31T07:33:00Z

npm i https://pkg.pr.new/storybookjs/mcp/@storybook/addon-mcp@208

npm i https://pkg.pr.new/storybookjs/mcp/@storybook/mcp@208

commit: d0c2848

codecov · 2026-03-31T07:34:08Z

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@70b5b23). Learn more about missing BASE report.
⚠️ Report is 6 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
packages/addon-mcp/src/preset.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #208   +/-   ##
=======================================
  Coverage        ?   74.00%           
=======================================
  Files           ?       42           
  Lines           ?     1185           
  Branches        ?      331           
=======================================
  Hits            ?      877           
  Misses          ?      193           
  Partials        ?      115

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Co-authored-by: Jeppe Reinhold <jeppe@chromatic.com>

codecov · 2026-03-31T08:41:35Z

Bundle Report

Changes will increase total bundle size by 62.98kB (127.76%) ⬆️⚠️, exceeding the configured threshold of 5%.

Bundle name	Size	Change
@storybook/mcp-esm	44.75kB	513 bytes (1.16%) ⬆️
@storybook/addon-mcp-esm	67.52kB	62.46kB (1236.4%) ⬆️⚠️

Affected Assets, Files, and Routes:

view changes for bundle: @storybook/addon-mcp-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
`preset.js` (New)	67.52kB	67.52kB	100.0% 🚀
~~*`preview-.js`*~~ (Deleted)*	-5.05kB	0 bytes	-100.0% 🗑️

Files in preset.js:

./src/preset.ts → Total Size: 4.89kB

view changes for bundle: @storybook/mcp-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
`index.js`	365 bytes	30.33kB	1.22%
`index.d.ts`	148 bytes	13.22kB	1.13%

Copilot

Pull request overview

Enables Storybook’s component manifest feature by default for @storybook/addon-mcp, and updates the repo’s Storybook prerelease dependency set accordingly.

Changes:

Add a features preset in @storybook/addon-mcp to enable componentsManifest.
Bump Storybook-related catalog versions from 10.4.0-alpha.2 to 10.4.0-alpha.6.
Refresh pnpm lockfiles to reflect the dependency updates.

Reviewed changes

Copilot reviewed 2 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pnpm-workspace.yaml	Updates Storybook-related catalog versions to `10.4.0-alpha.6`.
packages/addon-mcp/src/preset.ts	Introduces a `features` preset that enables `componentsManifest`.
packages/addon-mcp/pnpm-lock.yaml	Lockfile update for addon-mcp after Storybook bump.
eval/pnpm-lock.yaml	Lockfile update for eval workspace after Storybook bump.
apps/internal-storybook/pnpm-lock.yaml	Lockfile update for internal Storybook app after Storybook bump.

Files not reviewed (3)

apps/internal-storybook/pnpm-lock.yaml: Language not supported
eval/pnpm-lock.yaml: Language not supported
packages/addon-mcp/pnpm-lock.yaml: Language not supported

Copilot · 2026-04-01T10:38:23Z

+	return {
+		...existingFeatures,
+		componentsManifest: true,
+	};


The features preset currently forces componentsManifest: true regardless of what existingFeatures contains. That prevents consumers from opting out (e.g. if a user config or another preset explicitly sets componentsManifest: false). Consider treating this as a default (only enable when unset), and also account for the legacy experimentalComponentsManifest flag that getManifestStatus() still supports for older Storybook versions.

Suggested change

return {

...existingFeatures,

componentsManifest: true,

};

const result = {

...existingFeatures,

} as typeof existingFeatures & {

componentsManifest?: boolean;

experimentalComponentsManifest?: boolean;

};

const componentsManifest = existingFeatures?.componentsManifest as

| boolean

| undefined;

const experimentalComponentsManifest = (existingFeatures as any)

?.experimentalComponentsManifest as boolean | undefined;

if (typeof componentsManifest === 'boolean' && typeof experimentalComponentsManifest !== 'boolean') {

result.experimentalComponentsManifest = componentsManifest;

} else if (

typeof experimentalComponentsManifest === 'boolean' &&

typeof componentsManifest !== 'boolean'

) {

result.componentsManifest = experimentalComponentsManifest;

} else if (

typeof componentsManifest !== 'boolean' &&

typeof experimentalComponentsManifest !== 'boolean'

) {

result.componentsManifest = true;

result.experimentalComponentsManifest = true;

}

return result;

Copilot · 2026-04-01T10:38:23Z

+	return {
+		...existingFeatures,
+		componentsManifest: true,


New behavior is introduced via the features preset export, but there are no unit tests asserting its merge/override behavior (e.g., that it enables the manifest feature by default without clobbering an explicit user setting). Adding a focused test in preset.test.ts would help prevent regressions across Storybook versions.

Suggested change

return {

...existingFeatures,

componentsManifest: true,

const normalizedFeatures = existingFeatures ?? {};

const componentsManifest = normalizedFeatures.componentsManifest ?? true;

return {

...normalizedFeatures,

componentsManifest,

Copilot

Pull request overview

Copilot reviewed 3 out of 6 changed files in this pull request and generated no new comments.

Files not reviewed (3)

apps/internal-storybook/pnpm-lock.yaml: Language not supported
eval/pnpm-lock.yaml: Language not supported
packages/addon-mcp/pnpm-lock.yaml: Language not supported

feat: add componentManifest feature to experimental_devServer

bdd11fb

JReinhold approved these changes Mar 31, 2026

View reviewed changes

Comment thread packages/addon-mcp/src/preset.ts Outdated

Apply suggestion from @JReinhold

53daaa0

Co-authored-by: Jeppe Reinhold <jeppe@chromatic.com>

Fix check

e7fde6d

Copilot AI review requested due to automatic review settings April 1, 2026 10:34

Copilot AI reviewed Apr 1, 2026

View reviewed changes

shilman approved these changes Apr 1, 2026

View reviewed changes

yannbf added 2 commits April 2, 2026 13:47

Trigger release

5418509

upgrade sb

d0c2848

Copilot AI review requested due to automatic review settings April 2, 2026 11:55

Copilot started reviewing on behalf of yannbf April 2, 2026 11:55 View session

Copilot AI reviewed Apr 2, 2026

View reviewed changes

yannbf merged commit 599de1d into main Apr 2, 2026
19 checks passed

yannbf deleted the yann/enable-manifest-by-default branch April 2, 2026 11:59

storybook-app-bot Bot mentioned this pull request Apr 2, 2026

Version Packages #205

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feat: enable componentManifest by default - #208

feat: enable componentManifest by default#208
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-	return {
-		...existingFeatures,
-		componentsManifest: true,
-	};
+	const result = {
+		...existingFeatures,
+	} as typeof existingFeatures & {
+		componentsManifest?: boolean;
+		experimentalComponentsManifest?: boolean;
+	};
+	const componentsManifest = existingFeatures?.componentsManifest as
+		| boolean
+		| undefined;
+	const experimentalComponentsManifest = (existingFeatures as any)
+		?.experimentalComponentsManifest as boolean | undefined;
+	if (typeof componentsManifest === 'boolean' && typeof experimentalComponentsManifest !== 'boolean') {
+		result.experimentalComponentsManifest = componentsManifest;
+	} else if (
+		typeof experimentalComponentsManifest === 'boolean' &&
+		typeof componentsManifest !== 'boolean'
+	) {
+		result.componentsManifest = experimentalComponentsManifest;
+	} else if (
+		typeof componentsManifest !== 'boolean' &&
+		typeof experimentalComponentsManifest !== 'boolean'
+	) {
+		result.componentsManifest = true;
+		result.experimentalComponentsManifest = true;
+	}
+	return result;

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