fix: lint

Fixed JSON syntax for mcpServers configuration.

.changeset/seven-breads-stay.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/mcp': patch
+---
+
+feat: suggest against js variables in css

.github/workflows/publish-mcp.yml

@@ -5,6 +5,7 @@ on:
     secrets:
       MCP_KEY:
         required: true
+  workflow_dispatch:
 
 jobs:
   publish-mcp:
@@ -19,7 +20,7 @@ jobs:
         env:
           MCP_KEY: ${{ secrets.MCP_KEY }}
         run: |
-          NAME=mcp-publisher_1.3.3_$(uname -s | tr '[:upper:]' '[:lower:]')_$(uname -m | sed 's/x86_64/amd64/;s/aarch64/arm64/').tar.gz
+          NAME=mcp-publisher_$(uname -s | tr '[:upper:]' '[:lower:]')_$(uname -m | sed 's/x86_64/amd64/;s/aarch64/arm64/').tar.gz
           # Download MCP Publisher pinned to v1.3.3 using latest https for security and save it to a file named mcp-publisher.tar.gz
           curl --proto '=https' --proto-redir '=https' --tlsv1.2 -fL "https://github.com/modelcontextprotocol/registry/releases/download/v1.3.3/$NAME" -O
 

apps/mcp-remote/package.json

@@ -64,7 +64,7 @@
 	"dependencies": {
 		"@sveltejs/mcp-schema": "workspace:^",
 		"@sveltejs/mcp-server": "workspace:^",
-		"@tmcp/transport-http": "^0.6.3",
+		"@tmcp/transport-http": "^0.7.0",
-		"tmcp": "^1.15.0"
+		"tmcp": "^1.15.1"
 	}
 }

apps/mcp-remote/src/lib/mcp/index.ts

@@ -3,4 +3,5 @@ import { HttpTransport } from '@tmcp/transport-http';
 
 export const http_transport = new HttpTransport(server, {
 	cors: true,
+	path: '/mcp',
 });

documentation/docs/20-setup/30-remote-setup.md

@@ -96,6 +96,27 @@ It will open a file with your MCP servers where you can add the following config
 }
 ```
 
+## GitHub Coding Agent
+
+- Open your repository in GitHub
+- Go to Settings
+- Open Copilot > Coding agent
+- Edit the MCP configuration
+
+```json
+{
+	"mcpServers": {
+		"svelte": {
+			"type": "http",
+			"url": "https://mcp.svelte.dev/mcp",
+			"tools": ["*"]
+		}
+	}
+}
+```
+
+- Click _Save MCP configuration_
+
 ## Other clients
 
 If we didn't include the MCP client you are using, refer to their documentation for `remote` servers and use `https://mcp.svelte.dev/mcp` as the URL.

packages/mcp-server/src/mcp/handlers/tools/svelte-autofixer.test.ts

@@ -0,0 +1,94 @@
+import { beforeEach, describe, expect, it } from 'vitest';
+import { server } from '../../index.js';
+
+/**
+ * Small utility to create a JSON-RPC request without having to always specify as const
+ */
+function request<const T>(request: T) {
+	return request;
+}
+
+async function autofixer_tool_call(code: string, is_error = false, desired_svelte_version = 5) {
+	const result = await server.receive({
+		jsonrpc: '2.0',
+		id: 2,
+		method: 'tools/call',
+		params: {
+			name: 'svelte-autofixer',
+			arguments: {
+				code,
+				desired_svelte_version,
+				filename: 'App.svelte',
+			},
+		},
+	});
+
+	expect(result).toBeDefined();
+	expect(result.result).toBeDefined();
+	if (is_error) {
+		return result.result;
+	}
+	expect(result.result.structuredContent).toBeDefined();
+	return result.result.structuredContent;
+}
+
+describe('svelte-autofixer tool', () => {
+	beforeEach(async () => {
+		const initialize_request = request({
+			jsonrpc: '2.0',
+			id: 1,
+			method: 'initialize',
+			params: {
+				protocolVersion: '2025-06-18',
+				capabilities: {
+					roots: { listChanged: true },
+				},
+				clientInfo: {
+					name: 'test-client',
+					version: '1.0.0',
+				},
+			},
+		});
+
+		await server.receive(initialize_request, {
+			sessionId: 'svelte-autofixer-session',
+		});
+	});
+
+	it('should add suggestions for js parse errors', async () => {
+		const content = await autofixer_tool_call(`<script>
+			$state count = 0;
+		</script>`);
+		expect(content.issues.length).toBeGreaterThan(0);
+		expect(content.suggestions).toContain(
+			"The code can't be compiled because a Javascript parse error. In case you are using runes like this `$state variable_name = 3;` or `$derived variable_name = 3 * count` that's not how runes are used. You need to use them as function calls without importing them: `const variable_name = $state(3)` and `const variable_name = $derived(3 * count)`.",
+		);
+	});
+
+	it('should add suggestions for css invalid identifier', async () => {
+		const content = await autofixer_tool_call(`<script>
+				let my_color = $state('red');
+			</script>
+							
+			<style>
+				.my-class {
+					color: {my_color};
+				}
+			</style>`);
+
+		expect(content.issues.length).toBeGreaterThan(0);
+		expect(content.suggestions).toContain(
+			"The code can't be compiled because a valid CSS identifier is expected. This sometimes means you are trying to use a variable in CSS like this: `color: {my_color}` but Svelte doesn't support that. You can use inline CSS variables for that `<div style:--color={my_color}></div>` and then use the variable as usual in CSS with `color: var(--color)`.",
+		);
+	});
+
+	it('should error in case the passed in version is different from 4 or 5', async () => {
+		const content = await autofixer_tool_call(`whatever`, true, 3);
+
+		expect(content.content).toBeDefined();
+		expect(content.content[0]).toBeDefined();
+		expect(content.content[0].text).toContain(
+			'The desired_svelte_version MUST be either 4 or 5 but received "3"',
+		);
+	});
+});

packages/mcp-server/src/mcp/handlers/tools/svelte-autofixer.ts

@@ -90,6 +90,10 @@ export function svelte_autofixer(server: SvelteMcp) {
 					content.suggestions.push(
 						"The code can't be compiled because a Javascript parse error. In case you are using runes like this `$state variable_name = 3;` or `$derived variable_name = 3 * count` that's not how runes are used. You need to use them as function calls without importing them: `const variable_name = $state(3)` and `const variable_name = $derived(3 * count)`.",
 					);
+				} else if (error.message.includes('css_expected_identifier')) {
+					content.suggestions.push(
+						"The code can't be compiled because a valid CSS identifier is expected. This sometimes means you are trying to use a variable in CSS like this: `color: {my_color}` but Svelte doesn't support that. You can use inline CSS variables for that `<div style:--color={my_color}></div>` and then use the variable as usual in CSS with `color: var(--color)`.",
+					);
 				}
 			}
 

pnpm-lock.yaml

@@ -31,7 +31,7 @@ importers:
         version: 10.1.8(eslint@9.36.0(jiti@2.6.0))
       eslint-plugin-import:
         specifier: ^2.32.0
-        version: 2.32.0(eslint@9.36.0(jiti@2.6.0))
+        version: 2.32.0(@typescript-eslint/parser@8.44.1(eslint@9.36.0(jiti@2.6.0))(typescript@5.9.2))(eslint@9.36.0(jiti@2.6.0))
       eslint-plugin-svelte:
         specifier: ^3.12.3
         version: 3.12.4(eslint@9.36.0(jiti@2.6.0))(svelte@5.39.6)(ts-node@10.9.2(@types/node@24.5.2)(typescript@5.9.2))
@@ -69,11 +69,11 @@ importers:
         specifier: workspace:^
         version: link:../../packages/mcp-server
       '@tmcp/transport-http':
-        specifier: ^0.6.3
+        specifier: ^0.7.0
-        version: 0.6.3(tmcp@1.15.0(typescript@5.9.2))
+        version: 0.7.0(tmcp@1.15.1(typescript@5.9.2))
       tmcp:
-        specifier: ^1.15.0
+        specifier: ^1.15.1
-        version: 1.15.0(typescript@5.9.2)
+        version: 1.15.1(typescript@5.9.2)
     devDependencies:
       '@eslint/compat':
         specifier: ^1.3.2
@@ -1551,10 +1551,10 @@ packages:
   '@tmcp/session-manager@0.1.2':
     resolution: {integrity: sha512-hNkEeMt7/CdD8JdjPXMlIv5OMPTp5LnBqeo1Tb/AXcm31DpgwlNbf4voJ3CeWxWAZPPZ/MgHZ682TtgGhsvXiw==}
 
-  '@tmcp/transport-http@0.6.3':
+  '@tmcp/transport-http@0.7.0':
-    resolution: {integrity: sha512-GBU1elN9eqRYR6aU+hvFBX+Ivq5ouspREQBtQo1Av2JOfhxozbViXvZZyeyNAx+v6iprTkblI6Qm0ai/IdHQ8g==}
+    resolution: {integrity: sha512-JvLvi2ZM3xaBIZyxy6ssGtzlhL/5JvOkjWWymxkLi84vMK44pM5zCQVN1KXAfQqHbbDlYNR/BW39cd/eP3hylA==}
     peerDependencies:
-      tmcp: ^1.14.0
+      tmcp: ^1.15.1
 
   '@tmcp/transport-stdio@0.3.1':
     resolution: {integrity: sha512-r+eiHa2URw5+lBMRI0t4D84LfcWHam3DsTog/lPZSALIjlYxlFUfAaJ8dgh5gdQnmXiFJfE9hzmN0gIrB6+Lzw==}
@@ -3700,6 +3700,9 @@ packages:
   tmcp@1.15.0:
     resolution: {integrity: sha512-ell+gBSC7T5P7ogrROYsoohfLSAu0aXmKzWH8eZqkMX4K0iGc+BYJJC4kb60uJcK7PRZWBOktNGuOq1BLNFA6Q==}
 
+  tmcp@1.15.1:
+    resolution: {integrity: sha512-Mn2FZIcN6Vj/pJYda/Zv1t5Iv0vJIQDi+BRpcpBn9gNwID5bNtgMFOj+1LH3rkOJOTz9R78dIXSsJxDN5Vy90g==}
+
   to-regex-range@5.0.1:
     resolution: {integrity: sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==}
     engines: {node: '>=8.0'}
@@ -5287,10 +5290,11 @@ snapshots:
 
   '@tmcp/session-manager@0.1.2': {}
 
-  '@tmcp/transport-http@0.6.3(tmcp@1.15.0(typescript@5.9.2))':
+  '@tmcp/transport-http@0.7.0(tmcp@1.15.1(typescript@5.9.2))':
     dependencies:
       '@tmcp/session-manager': 0.1.2
-      tmcp: 1.15.0(typescript@5.9.2)
+      esm-env: 1.2.2
+      tmcp: 1.15.1(typescript@5.9.2)
 
   '@tmcp/transport-stdio@0.3.1(tmcp@1.15.0(typescript@5.9.2))':
     dependencies:
@@ -6105,16 +6109,17 @@ snapshots:
     transitivePeerDependencies:
       - supports-color
 
-  eslint-module-utils@2.12.1(eslint-import-resolver-node@0.3.9)(eslint@9.36.0(jiti@2.6.0)):
+  eslint-module-utils@2.12.1(@typescript-eslint/parser@8.44.1(eslint@9.36.0(jiti@2.6.0))(typescript@5.9.2))(eslint-import-resolver-node@0.3.9)(eslint@9.36.0(jiti@2.6.0)):
     dependencies:
       debug: 3.2.7
     optionalDependencies:
+      '@typescript-eslint/parser': 8.44.1(eslint@9.36.0(jiti@2.6.0))(typescript@5.9.2)
       eslint: 9.36.0(jiti@2.6.0)
       eslint-import-resolver-node: 0.3.9
     transitivePeerDependencies:
       - supports-color
 
-  eslint-plugin-import@2.32.0(eslint@9.36.0(jiti@2.6.0)):
+  eslint-plugin-import@2.32.0(@typescript-eslint/parser@8.44.1(eslint@9.36.0(jiti@2.6.0))(typescript@5.9.2))(eslint@9.36.0(jiti@2.6.0)):
     dependencies:
       '@rtsao/scc': 1.1.0
       array-includes: 3.1.9
@@ -6125,7 +6130,7 @@ snapshots:
       doctrine: 2.1.0
       eslint: 9.36.0(jiti@2.6.0)
       eslint-import-resolver-node: 0.3.9
-      eslint-module-utils: 2.12.1(eslint-import-resolver-node@0.3.9)(eslint@9.36.0(jiti@2.6.0))
+      eslint-module-utils: 2.12.1(@typescript-eslint/parser@8.44.1(eslint@9.36.0(jiti@2.6.0))(typescript@5.9.2))(eslint-import-resolver-node@0.3.9)(eslint@9.36.0(jiti@2.6.0))
       hasown: 2.0.2
       is-core-module: 2.16.1
       is-glob: 4.0.3
@@ -6136,6 +6141,8 @@ snapshots:
       semver: 6.3.1
       string.prototype.trimend: 1.0.9
       tsconfig-paths: 3.15.0
+    optionalDependencies:
+      '@typescript-eslint/parser': 8.44.1(eslint@9.36.0(jiti@2.6.0))(typescript@5.9.2)
     transitivePeerDependencies:
       - eslint-import-resolver-typescript
       - eslint-import-resolver-webpack
@@ -7581,6 +7588,16 @@ snapshots:
     transitivePeerDependencies:
       - typescript
 
+  tmcp@1.15.1(typescript@5.9.2):
+    dependencies:
+      '@standard-schema/spec': 1.0.0
+      json-rpc-2.0: 1.7.1
+      sqids: 0.3.0
+      uri-template-matcher: 1.1.1
+      valibot: 1.1.0(typescript@5.9.2)
+    transitivePeerDependencies:
+      - typescript
+
   to-regex-range@5.0.1:
     dependencies:
       is-number: 7.0.0