diff --git a/tests/__snapshots__/doctor-output-conformance.test.ts.snap b/tests/__snapshots__/doctor-output-conformance.test.ts.snap
new file mode 100644
index 0000000..b96030c
--- /dev/null
+++ b/tests/__snapshots__/doctor-output-conformance.test.ts.snap
@@ -0,0 +1,27 @@
+// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
+
+exports[`doctor output conformance > keeps a failure rendering stable 1`] = `
+"[PASS] Node.js: Supported version detected.
+[FAIL] Stellar CLI: Required CLI is missing.
+  Remediation: Install the official Stellar CLI.
+Summary: 1 passed, 0 warnings, 1 failed.
+Overall health: action required.
+"
+`;
+
+exports[`doctor output conformance > keeps a warning rendering stable 1`] = `
+"[PASS] Node.js: Supported version detected.
+[WARN] Docker: Docker is not available.
+  Remediation: Install Docker only if the selected workflow requires it.
+Summary: 1 passed, 1 warnings, 0 failed.
+Overall health: usable with warnings.
+"
+`;
+
+exports[`doctor output conformance > keeps an all-pass rendering stable 1`] = `
+"[PASS] Node.js: Supported version detected.
+[PASS] Git: Git is available.
+Summary: 2 passed, 0 warnings, 0 failed.
+Overall health: ready.
+"
+`;
diff --git a/tests/doctor-output-conformance.test.ts b/tests/doctor-output-conformance.test.ts
new file mode 100644
index 0000000..cd679e8
--- /dev/null
+++ b/tests/doctor-output-conformance.test.ts
@@ -0,0 +1,128 @@
+import { describe, expect, it } from 'vitest';
+import { createDoctorCommand } from '../src/commands/doctor.js';
+import type { DiagnosticCheck } from '../src/diagnostics/types.js';
+import { EXIT_CODES } from '../src/errors/errors.js';
+import { createCapturedTerminalOutput } from './helpers/index.js';
+
+function check(
+  id: string,
+  label: string,
+  status: 'pass' | 'warn' | 'fail',
+  message: string,
+  remediation?: string,
+): DiagnosticCheck {
+  return {
+    id,
+    label,
+    run: () => ({
+      id,
+      label,
+      status,
+      message,
+      ...(remediation === undefined ? {} : { remediation }),
+    }),
+  };
+}
+
+function renderDoctorOutput(checks: readonly DiagnosticCheck[]): {
+  stdout: string;
+  stderr: string;
+  exitCode: number;
+} {
+  const captured = createCapturedTerminalOutput();
+  let exitCode = -1;
+
+  const command = createDoctorCommand({
+    checks,
+    output: captured.output,
+    setExitCode: (code) => {
+      exitCode = code;
+    },
+  });
+
+  command.parse(['node', 'doctor']);
+
+  return {
+    stdout: captured.stdoutText(),
+    stderr: captured.stderrText(),
+    exitCode,
+  };
+}
+
+describe('doctor output conformance', () => {
+  it('keeps an all-pass rendering stable', () => {
+    const result = renderDoctorOutput([
+      check('node', 'Node.js', 'pass', 'Supported version detected.'),
+      check('git', 'Git', 'pass', 'Git is available.'),
+    ]);
+
+    expect(result.exitCode).toBe(EXIT_CODES.success);
+    expect(result.stderr).toBe('');
+
+    expect(result.stdout).toMatchSnapshot();
+  });
+
+  it('keeps a warning rendering stable', () => {
+    const result = renderDoctorOutput([
+      check('node', 'Node.js', 'pass', 'Supported version detected.'),
+      check(
+        'docker',
+        'Docker',
+        'warn',
+        'Docker is not available.',
+        'Install Docker only if the selected workflow requires it.',
+      ),
+    ]);
+
+    expect(result.exitCode).toBe(EXIT_CODES.success);
+    expect(result.stderr).toBe('');
+
+    expect(result.stdout).toMatchSnapshot();
+  });
+
+  it('keeps a failure rendering stable', () => {
+    const result = renderDoctorOutput([
+      check('node', 'Node.js', 'pass', 'Supported version detected.'),
+      check(
+        'stellar',
+        'Stellar CLI',
+        'fail',
+        'Required CLI is missing.',
+        'Install the official Stellar CLI.',
+      ),
+    ]);
+
+    expect(result.exitCode).toBe(EXIT_CODES.diagnostic);
+    expect(result.stderr).toBe('');
+
+    expect(result.stdout).toMatchSnapshot();
+  });
+
+  it('preserves status ordering and summary markers', () => {
+    const result = renderDoctorOutput([
+      check('node', 'Node.js', 'pass', 'Supported version detected.'),
+      check('docker', 'Docker', 'warn', 'Docker is not available.'),
+      check('stellar', 'Stellar CLI', 'fail', 'Required CLI is missing.'),
+    ]);
+
+    expect(result.stdout).toContain(
+      '[PASS] Node.js: Supported version detected.',
+    );
+    expect(result.stdout).toContain('[WARN] Docker: Docker is not available.');
+    expect(result.stdout).toContain(
+      '[FAIL] Stellar CLI: Required CLI is missing.',
+    );
+
+    expect(result.stdout).toContain('Summary: 1 passed, 1 warnings, 1 failed.');
+
+    expect(result.stdout).toContain('Overall health: action required.');
+
+    expect(result.stdout.indexOf('[PASS]')).toBeLessThan(
+      result.stdout.indexOf('[WARN]'),
+    );
+
+    expect(result.stdout.indexOf('[WARN]')).toBeLessThan(
+      result.stdout.indexOf('[FAIL]'),
+    );
+  });
+});