diff --git a/.changeset/shared-ignores-apply.md b/.changeset/shared-ignores-apply.md
new file mode 100644
index 0000000..d98cbda
--- /dev/null
+++ b/.changeset/shared-ignores-apply.md
@@ -0,0 +1,5 @@
+---
+"@bomb.sh/tools": patch
+---
+
+`format` CLI command applies the shared `ignorePatterns` to the project being formatted instead of only to files inside `@bomb.sh/tools`.
diff --git a/src/commands/format.test.ts b/src/commands/format.test.ts
new file mode 100644
index 0000000..87f34bc
--- /dev/null
+++ b/src/commands/format.test.ts
@@ -0,0 +1,27 @@
+import { fileURLToPath } from 'node:url';
+import { x } from 'tinyexec';
+import { describe, it, expect } from 'vitest';
+import { createFixture } from '../test-utils/index.ts';
+
+const bin = fileURLToPath(new URL('../bin.ts', import.meta.url));
+
+describe('format command', () => {
+	it('applies the shared ignore patterns to the project being formatted', async () => {
+		const fixture = await createFixture({
+			src: { 'a.ts': 'const a={b:1}\n' },
+			'data.json': '{"a":1}',
+			'config.jsonc': '{"a":1}',
+			'README.md': '* item\n',
+			docs: { 'nested.md': '* item\n' },
+			'.github/workflows/ci.yml': 'a:   1\n',
+		});
+
+		const result = await x(
+			process.execPath,
+			['--experimental-strip-types', '--no-warnings', bin, 'format', '--list-different'],
+			{ nodeOptions: { cwd: fileURLToPath(fixture.root) }, throwOnError: false },
+		);
+
+		expect(result.stdout.trim().split('\n').toSorted()).toEqual(['src/a.ts']);
+	});
+});
diff --git a/src/commands/format.ts b/src/commands/format.ts
index 7cd6baa..7d66929 100644
--- a/src/commands/format.ts
+++ b/src/commands/format.ts
@@ -1,3 +1,4 @@
+import { readFile } from 'node:fs/promises';
 import { fileURLToPath } from 'node:url';
 import { x } from 'tinyexec';
 import type { CommandContext } from '../context.ts';
@@ -6,7 +7,13 @@ import { local } from '../utils.ts';
 const config = fileURLToPath(new URL('../../oxfmtrc.json', import.meta.url));
 
 export async function format(ctx: CommandContext) {
-	const result = x(local('oxfmt'), ['-c', config, ...ctx.args]);
+	// oxfmt resolves `ignorePatterns` relative to the config file, which lives in this
+	// package, so pass them as excludes to apply them to the project being formatted.
+	const { ignorePatterns = [] }: { ignorePatterns?: string[] } = JSON.parse(
+		await readFile(config, 'utf-8'),
+	);
+	const excludes = ignorePatterns.map((pattern) => `!${pattern}`);
+	const result = x(local('oxfmt'), ['-c', config, ...ctx.args, ...excludes]);
 
 	for await (const line of result) {
 		console.info(line);