diff --git a/apps/api/__tests__/integration/health.test.ts b/apps/api/__tests__/integration/health.test.ts
index 4f0da75..0d73704 100644
--- a/apps/api/__tests__/integration/health.test.ts
+++ b/apps/api/__tests__/integration/health.test.ts
@@ -14,5 +14,12 @@ describe('Health Endpoint', () => {
     expect(response.body.checks).toBeDefined();
     expect(response.body.checks.database).toBeDefined();
     expect(response.body.checks.redis).toBeDefined();
+
+    expect(typeof response.body.ok).toBe('boolean');
+    expect(response.body.service).toBe('fieldview-api');
+    expect(typeof response.body.commit).toBe('string');
+    expect(typeof response.body.env).toBe('string');
+    expect(typeof response.body.utc).toBe('string');
+    expect(response.body.ok).toBe(response.body.status === 'healthy');
   });
 });
diff --git a/apps/api/src/lib/__tests__/health-fleet.test.ts b/apps/api/src/lib/__tests__/health-fleet.test.ts
new file mode 100644
index 0000000..62d5c8c
--- /dev/null
+++ b/apps/api/src/lib/__tests__/health-fleet.test.ts
@@ -0,0 +1,45 @@
+import { afterEach, beforeEach, describe, expect, it } from 'vitest';
+
+import { resolveHealthCommit } from '../health-fleet';
+
+const COMMIT_KEYS = [
+  'RAILWAY_GIT_COMMIT_SHA',
+  'VERCEL_GIT_COMMIT_SHA',
+  'GIT_COMMIT',
+] as const;
+
+describe('resolveHealthCommit', () => {
+  const saved: Partial<Record<(typeof COMMIT_KEYS)[number], string | undefined>> = {};
+
+  beforeEach(() => {
+    for (const key of COMMIT_KEYS) {
+      saved[key] = process.env[key];
+      delete process.env[key];
+    }
+  });
+
+  afterEach(() => {
+    for (const key of COMMIT_KEYS) {
+      const value = saved[key];
+      if (value === undefined) {
+        delete process.env[key];
+      } else {
+        process.env[key] = value;
+      }
+    }
+  });
+
+  it('returns RAILWAY_GIT_COMMIT_SHA when set', () => {
+    process.env.RAILWAY_GIT_COMMIT_SHA = 'abc123fullsha';
+    expect(resolveHealthCommit()).toBe('abc123fullsha');
+  });
+
+  it('returns unknown when all commit env vars are unset', () => {
+    expect(resolveHealthCommit()).toBe('unknown');
+  });
+
+  it('falls back to GIT_COMMIT when Railway and Vercel are unset', () => {
+    process.env.GIT_COMMIT = 'localsha';
+    expect(resolveHealthCommit()).toBe('localsha');
+  });
+});
diff --git a/apps/api/src/lib/health-fleet.ts b/apps/api/src/lib/health-fleet.ts
new file mode 100644
index 0000000..a5f78af
--- /dev/null
+++ b/apps/api/src/lib/health-fleet.ts
@@ -0,0 +1,30 @@
+/** Fleet health contract: build identity fields for GET /health. */
+
+export function resolveHealthCommit(): string {
+  return (
+    process.env.RAILWAY_GIT_COMMIT_SHA ??
+    process.env.VERCEL_GIT_COMMIT_SHA ??
+    process.env.GIT_COMMIT ??
+    'unknown'
+  );
+}
+
+export function resolveHealthEnv(): string {
+  return process.env.APP_ENV ?? process.env.RAILWAY_ENVIRONMENT_NAME ?? 'dev';
+}
+
+export function buildFleetHealthFields(ok: boolean, service: string): {
+  ok: boolean;
+  service: string;
+  commit: string;
+  env: string;
+  utc: string;
+} {
+  return {
+    ok,
+    service,
+    commit: resolveHealthCommit(),
+    env: resolveHealthEnv(),
+    utc: new Date().toISOString(),
+  };
+}
diff --git a/apps/api/src/routes/health.ts b/apps/api/src/routes/health.ts
index 0876ad3..cf866cd 100644
--- a/apps/api/src/routes/health.ts
+++ b/apps/api/src/routes/health.ts
@@ -6,6 +6,7 @@
 
 import express, { type Request, Response, Router } from 'express';
 
+import { buildFleetHealthFields } from '../lib/health-fleet';
 import { prisma } from '../lib/prisma';
 import { redisClient } from '../lib/redis';
 
@@ -90,6 +91,7 @@ export function createHealthRouter(): Router {
       timestamp: new Date().toISOString(),
       checks,
       email: checkEmailProvider(),
+      ...buildFleetHealthFields(isHealthy, 'fieldview-api'),
     });
   });
 
diff --git a/apps/web/app/api/health/route.ts b/apps/web/app/api/health/route.ts
new file mode 100644
index 0000000..a2118d4
--- /dev/null
+++ b/apps/web/app/api/health/route.ts
@@ -0,0 +1,13 @@
+import { NextResponse } from 'next/server';
+
+import { resolveHealthCommit, resolveHealthEnv } from '@/lib/health-fleet';
+
+export async function GET(): Promise<NextResponse> {
+  return NextResponse.json({
+    ok: true,
+    service: 'fieldview-web',
+    commit: resolveHealthCommit(),
+    env: resolveHealthEnv(),
+    utc: new Date().toISOString(),
+  });
+}
diff --git a/apps/web/lib/health-fleet.test.ts b/apps/web/lib/health-fleet.test.ts
new file mode 100644
index 0000000..d00abf5
--- /dev/null
+++ b/apps/web/lib/health-fleet.test.ts
@@ -0,0 +1,40 @@
+import { afterEach, beforeEach, describe, expect, it } from 'vitest';
+
+import { resolveHealthCommit } from './health-fleet';
+
+const COMMIT_KEYS = [
+  'RAILWAY_GIT_COMMIT_SHA',
+  'VERCEL_GIT_COMMIT_SHA',
+  'GIT_COMMIT',
+] as const;
+
+describe('resolveHealthCommit', () => {
+  const saved: Partial<Record<(typeof COMMIT_KEYS)[number], string | undefined>> = {};
+
+  beforeEach(() => {
+    for (const key of COMMIT_KEYS) {
+      saved[key] = process.env[key];
+      delete process.env[key];
+    }
+  });
+
+  afterEach(() => {
+    for (const key of COMMIT_KEYS) {
+      const value = saved[key];
+      if (value === undefined) {
+        delete process.env[key];
+      } else {
+        process.env[key] = value;
+      }
+    }
+  });
+
+  it('returns RAILWAY_GIT_COMMIT_SHA when set', () => {
+    process.env.RAILWAY_GIT_COMMIT_SHA = 'abc123fullsha';
+    expect(resolveHealthCommit()).toBe('abc123fullsha');
+  });
+
+  it('returns unknown when all commit env vars are unset', () => {
+    expect(resolveHealthCommit()).toBe('unknown');
+  });
+});
diff --git a/apps/web/lib/health-fleet.ts b/apps/web/lib/health-fleet.ts
new file mode 100644
index 0000000..294ffe5
--- /dev/null
+++ b/apps/web/lib/health-fleet.ts
@@ -0,0 +1,14 @@
+/** Fleet health contract: build identity fields for GET /api/health. */
+
+export function resolveHealthCommit(): string {
+  return (
+    process.env.RAILWAY_GIT_COMMIT_SHA ??
+    process.env.VERCEL_GIT_COMMIT_SHA ??
+    process.env.GIT_COMMIT ??
+    'unknown'
+  );
+}
+
+export function resolveHealthEnv(): string {
+  return process.env.APP_ENV ?? process.env.RAILWAY_ENVIRONMENT_NAME ?? 'dev';
+}