diff --git a/.changeset/public-config-schema.md b/.changeset/public-config-schema.md
new file mode 100644
index 00000000..d9fc07fc
--- /dev/null
+++ b/.changeset/public-config-schema.md
@@ -0,0 +1,7 @@
+---
+'@when/web': patch
+'@when/worker': patch
+'@when/cli': patch
+---
+
+Serve the generated editor configuration schema publicly at /schema.json from the deployed package. Require cache revalidation and expose only the schema, never loaded configuration or credentials.
diff --git a/apps/web/e2e/schema.e2e.ts b/apps/web/e2e/schema.e2e.ts
new file mode 100644
index 00000000..d639bf6b
--- /dev/null
+++ b/apps/web/e2e/schema.e2e.ts
@@ -0,0 +1,34 @@
+import { expect, test } from '@playwright/test';
+import { signInAsAdmin } from './support/auth.ts';
+
+test('schema.json is public, production-packaged, and independent of instance configuration', async ({
+	page,
+	request
+}) => {
+	const anonymous = await request.get('/schema.json');
+	expect(anonymous.status()).toBe(200);
+	expect(anonymous.headers()['content-type']).toBe('application/schema+json; charset=utf-8');
+	expect(anonymous.headers()['cache-control']).toBe('public, max-age=0, must-revalidate');
+	expect(anonymous.headers().location).toBeUndefined();
+	const text = await anonymous.text();
+	const schema = JSON.parse(text);
+	expect(schema.title).toBe('When configuration');
+	expect(schema.$schema).toBe('https://json-schema.org/draft/2020-12/schema');
+	expect(schema.$defs.Meeting.required).toContain('title');
+	expect(schema.$defs.Meeting.required).not.toContain('duration_minutes');
+	for (const instanceValue of [
+		'E2E Fixture',
+		'e2e-admin-password',
+		'e2e-smtp-password',
+		'e2e-caldav-password',
+		'e2e-video-password'
+	]) {
+		expect(text).not.toContain(instanceValue);
+	}
+
+	await signInAsAdmin(page);
+	const signedIn = await page.request.get('/schema.json?include=config&role=host');
+	expect(signedIn.status()).toBe(200);
+	const signedInSchema = await signedIn.json();
+	expect(signedInSchema).toEqual(schema);
+});
diff --git a/apps/web/src/routes/schema.json/+server.ts b/apps/web/src/routes/schema.json/+server.ts
new file mode 100644
index 00000000..ae3dfb2d
--- /dev/null
+++ b/apps/web/src/routes/schema.json/+server.ts
@@ -0,0 +1,11 @@
+import { json } from '@sveltejs/kit';
+import editorSchema from '@when/config/schema.json' with { type: 'json' };
+
+export function GET(): Response {
+	return json(editorSchema, {
+		headers: {
+			'content-type': 'application/schema+json; charset=utf-8',
+			'cache-control': 'public, max-age=0, must-revalidate'
+		}
+	});
+}
diff --git a/apps/web/src/routes/schema.json/server.test.ts b/apps/web/src/routes/schema.json/server.test.ts
new file mode 100644
index 00000000..a61c57e3
--- /dev/null
+++ b/apps/web/src/routes/schema.json/server.test.ts
@@ -0,0 +1,32 @@
+import { describe, expect, test, vi } from 'vitest';
+import editorSchema from '@when/config/schema.json' with { type: 'json' };
+import { GET } from './+server';
+
+const getConfig = vi.hoisted(() =>
+	vi.fn(() => {
+		throw new Error('Schema must not read instance configuration');
+	})
+);
+vi.mock('$lib/server/state', () => ({ getConfig }));
+
+describe('GET /schema.json', () => {
+	test('returns only the bundled editor schema with the schema media type', async () => {
+		const response = GET();
+		expect(response.status).toBe(200);
+		expect(response.headers.get('content-type')).toBe('application/schema+json; charset=utf-8');
+		expect(response.headers.get('cache-control')).toBe('public, max-age=0, must-revalidate');
+		const body = await response.json();
+		expect(body).toEqual(editorSchema);
+		expect(getConfig).not.toHaveBeenCalled();
+	});
+
+	test('does not let a response consumer mutate the bundled schema for later requests', async () => {
+		const response = GET();
+		const body = await response.json();
+		body.title = 'Not the schema';
+		const next = GET();
+		const nextBody = await next.json();
+		expect(nextBody).toEqual(editorSchema);
+		expect(getConfig).not.toHaveBeenCalled();
+	});
+});
diff --git a/packages/config/package.json b/packages/config/package.json
index 7ceb3c44..7ea58fa5 100644
--- a/packages/config/package.json
+++ b/packages/config/package.json
@@ -8,6 +8,10 @@
 			"development": "./src/index.ts",
 			"types": "./dist/src/index.d.ts",
 			"import": "./dist/src/index.js"
+		},
+		"./schema.json": {
+			"development": "./src/config.schema.json",
+			"default": "./dist/src/config.schema.json"
 		}
 	},
 	"files": [
diff --git a/packages/config/src/schema-export.test.ts b/packages/config/src/schema-export.test.ts
new file mode 100644
index 00000000..ea0aa3aa
--- /dev/null
+++ b/packages/config/src/schema-export.test.ts
@@ -0,0 +1,38 @@
+import { readFileSync } from 'node:fs';
+import { describe, expect, test } from 'vitest';
+import generatedSchema from './config.schema.json' with { type: 'json' };
+
+function references(value: unknown): string[] {
+	if (value === null || typeof value !== 'object') return [];
+	const refs: string[] = [];
+	if ('$ref' in value && typeof value.$ref === 'string') refs.push(value.$ref);
+	for (const child of Object.values(value)) refs.push(...references(child));
+	return refs;
+}
+
+describe('public editor schema asset', () => {
+	test('exports the generated schema and includes the same asset in the compiled package', async () => {
+		// The production export is available after build, not during source typechecking.
+		const schemaPath = '@when/config/schema.json';
+		const exported = await import(schemaPath, { with: { type: 'json' } });
+		expect(exported.default).toEqual(generatedSchema);
+		const compiledText = readFileSync(
+			new URL('../dist/src/config.schema.json', import.meta.url),
+			'utf8'
+		);
+		const compiled = JSON.parse(compiledText);
+		expect(compiled).toEqual(generatedSchema);
+	});
+
+	test('retains editor-friendly optional defaults and self-contained references', () => {
+		expect(generatedSchema.$schema).toBe('https://json-schema.org/draft/2020-12/schema');
+		expect(generatedSchema.properties.version.default).toBe(1);
+		expect(generatedSchema.required).not.toContain('version');
+		expect(generatedSchema.required).not.toContain('providers');
+		expect(generatedSchema.$defs.Meeting.required).toContain('title');
+		expect(generatedSchema.$defs.Meeting.required).not.toContain('duration_minutes');
+		const refs = references(generatedSchema);
+		expect(refs.length).toBeGreaterThan(0);
+		for (const reference of refs) expect(reference).toMatch(/^#/);
+	});
+});