diff --git a/x-pack/plugins/fleet/server/routes/schema/errors.ts b/x-pack/plugins/fleet/server/routes/schema/errors.ts
index 0143e0fcd9b598..1d8f0f5d5b92d3 100644
--- a/x-pack/plugins/fleet/server/routes/schema/errors.ts
+++ b/x-pack/plugins/fleet/server/routes/schema/errors.ts
@@ -19,6 +19,11 @@ export const genericErrorResponse = () =>
     }
   );
 
+export const notFoundResponse = () =>
+  schema.object({
+    message: schema.string(),
+  });
+
 export const internalErrorResponse = () =>
   schema.object(
     {
diff --git a/x-pack/plugins/fleet/server/routes/settings/index.ts b/x-pack/plugins/fleet/server/routes/settings/index.ts
index b9f672627daa7d..72a4eaf6d626f3 100644
--- a/x-pack/plugins/fleet/server/routes/settings/index.ts
+++ b/x-pack/plugins/fleet/server/routes/settings/index.ts
@@ -4,6 +4,7 @@
  * 2.0; you may not use this file except in compliance with the Elastic License
  * 2.0.
  */
+import { schema } from '@kbn/config-schema';
 
 import { parseExperimentalConfigValue } from '../../../common/experimental_features';
 import { API_VERSIONS } from '../../../common/constants';
@@ -18,6 +19,8 @@ import {
 } from '../../types';
 import type { FleetConfigType } from '../../config';
 
+import { genericErrorResponse, notFoundResponse } from '../schema/errors';
+
 import { getEnrollmentSettingsHandler } from './enrollment_settings_handler';
 
 import {
@@ -27,6 +30,36 @@ import {
   putSpaceSettingsHandler,
 } from './settings_handler';
 
+const spaceSettingsResponse = () =>
+  schema.object({
+    item: schema.object({
+      managed_by: schema.maybe(schema.string()),
+      allowed_namespace_prefixes: schema.arrayOf(schema.string()),
+    }),
+  });
+
+const settingsResponse = () =>
+  schema.object({
+    item: schema.object({
+      has_seen_add_data_notice: schema.maybe(schema.boolean()),
+      fleet_server_hosts: schema.maybe(schema.arrayOf(schema.string())),
+      prerelease_integrations_enabled: schema.boolean(),
+      id: schema.string(),
+      version: schema.maybe(schema.string()),
+      preconfigured_fields: schema.maybe(schema.arrayOf(schema.literal('fleet_server_hosts'))),
+      secret_storage_requirements_met: schema.maybe(schema.boolean()),
+      output_secret_storage_requirements_met: schema.maybe(schema.boolean()),
+      use_space_awareness_migration_status: schema.maybe(
+        schema.oneOf([
+          schema.literal('pending'),
+          schema.literal('success'),
+          schema.literal('error'),
+        ])
+      ),
+      use_space_awareness_migration_started_at: schema.maybe(schema.string()),
+    }),
+  });
+
 export const registerRoutes = (router: FleetAuthzRouter, config: FleetConfigType) => {
   const experimentalFeatures = parseExperimentalConfigValue(config.enableExperimental);
   if (experimentalFeatures.useSpaceAwareness) {
@@ -45,7 +78,14 @@ export const registerRoutes = (router: FleetAuthzRouter, config: FleetConfigType
       .addVersion(
         {
           version: API_VERSIONS.public.v1,
-          validate: { request: GetSpaceSettingsRequestSchema },
+          validate: {
+            request: GetSpaceSettingsRequestSchema,
+            response: {
+              200: {
+                body: spaceSettingsResponse,
+              },
+            },
+          },
         },
         getSpaceSettingsHandler
       );
@@ -61,7 +101,14 @@ export const registerRoutes = (router: FleetAuthzRouter, config: FleetConfigType
       .addVersion(
         {
           version: API_VERSIONS.public.v1,
-          validate: { request: PutSpaceSettingsRequestSchema },
+          validate: {
+            request: PutSpaceSettingsRequestSchema,
+            response: {
+              200: {
+                body: spaceSettingsResponse,
+              },
+            },
+          },
         },
         putSpaceSettingsHandler
       );
@@ -74,11 +121,27 @@ export const registerRoutes = (router: FleetAuthzRouter, config: FleetConfigType
         fleet: { readSettings: true },
       },
       description: `Get settings`,
+      options: {
+        tags: ['Fleet internals'],
+      },
     })
     .addVersion(
       {
         version: API_VERSIONS.public.v1,
-        validate: { request: GetSettingsRequestSchema },
+        validate: {
+          request: GetSettingsRequestSchema,
+          response: {
+            200: {
+              body: settingsResponse,
+            },
+            400: {
+              body: genericErrorResponse,
+            },
+            404: {
+              body: notFoundResponse,
+            },
+          },
+        },
       },
       getSettingsHandler
     );
@@ -89,11 +152,27 @@ export const registerRoutes = (router: FleetAuthzRouter, config: FleetConfigType
         fleet: { allSettings: true },
       },
       description: `Update settings`,
+      options: {
+        tags: ['Fleet internals'],
+      },
     })
     .addVersion(
       {
         version: API_VERSIONS.public.v1,
-        validate: { request: PutSettingsRequestSchema },
+        validate: {
+          request: PutSettingsRequestSchema,
+          response: {
+            200: {
+              body: settingsResponse,
+            },
+            400: {
+              body: genericErrorResponse,
+            },
+            404: {
+              body: notFoundResponse,
+            },
+          },
+        },
       },
       putSettingsHandler
     );
@@ -104,11 +183,87 @@ export const registerRoutes = (router: FleetAuthzRouter, config: FleetConfigType
         return authz.fleet.addAgents || authz.fleet.addFleetServers;
       },
       description: `Get enrollment settings`,
+      options: {
+        tags: ['Fleet internals'],
+      },
     })
     .addVersion(
       {
         version: API_VERSIONS.public.v1,
-        validate: { request: GetEnrollmentSettingsRequestSchema },
+        validate: {
+          request: GetEnrollmentSettingsRequestSchema,
+          response: {
+            200: {
+              body: () =>
+                schema.object({
+                  fleet_server: schema.object({
+                    policies: schema.arrayOf(
+                      schema.object({
+                        id: schema.string(),
+                        name: schema.string(),
+                        is_managed: schema.boolean(),
+                        is_default_fleet_server: schema.maybe(schema.boolean()),
+                        has_fleet_server: schema.maybe(schema.boolean()),
+                        fleet_server_host_id: schema.nullable(schema.maybe(schema.string())),
+                        download_source_id: schema.nullable(schema.maybe(schema.string())),
+                        space_ids: schema.maybe(schema.arrayOf(schema.string())),
+                      })
+                    ),
+                    has_active: schema.boolean(),
+                    host: schema.maybe(
+                      schema.object({
+                        id: schema.string(),
+                        name: schema.string(),
+                        host_urls: schema.arrayOf(schema.string()),
+                        is_default: schema.boolean(),
+                        is_preconfigured: schema.boolean(),
+                        is_internal: schema.maybe(schema.boolean()),
+                        proxy_id: schema.nullable(schema.maybe(schema.string())),
+                      })
+                    ),
+                    host_proxy: schema.maybe(
+                      schema.object({
+                        id: schema.string(),
+                        proxy_headers: schema.maybe(
+                          schema.recordOf(
+                            schema.string(),
+                            schema.oneOf([schema.string(), schema.number(), schema.boolean()])
+                          )
+                        ),
+                        name: schema.string(),
+                        url: schema.string(),
+                        certificate_authorities: schema.nullable(schema.maybe(schema.string())),
+                        certificate: schema.nullable(schema.maybe(schema.string())),
+                        certificate_key: schema.nullable(schema.maybe(schema.string())),
+                        is_preconfigured: schema.boolean(),
+                      })
+                    ),
+                  }),
+                  download_source: schema.maybe(
+                    schema.object({
+                      id: schema.string(),
+                      name: schema.string(),
+                      host: schema.string(),
+                      is_default: schema.boolean(),
+                      proxy_id: schema.nullable(
+                        schema.maybe(
+                          schema.string({
+                            meta: {
+                              description:
+                                'The ID of the proxy to use for this download source. See the proxies API for more information.',
+                            },
+                          })
+                        )
+                      ),
+                    })
+                  ),
+                }),
+            },
+            400: {
+              body: genericErrorResponse,
+            },
+          },
+        },
       },
       getEnrollmentSettingsHandler
     );
diff --git a/x-pack/plugins/fleet/server/routes/standalone_agent_api_key/index.ts b/x-pack/plugins/fleet/server/routes/standalone_agent_api_key/index.ts
index 9255f058aee462..15e823d02cd2ac 100644
--- a/x-pack/plugins/fleet/server/routes/standalone_agent_api_key/index.ts
+++ b/x-pack/plugins/fleet/server/routes/standalone_agent_api_key/index.ts
@@ -4,6 +4,7 @@
  * 2.0; you may not use this file except in compliance with the Elastic License
  * 2.0.
  */
+import { schema } from '@kbn/config-schema';
 
 import type { FleetAuthzRouter } from '../../services/security';
 
@@ -27,7 +28,23 @@ export const registerRoutes = (router: FleetAuthzRouter) => {
     .addVersion(
       {
         version: API_VERSIONS.internal.v1,
-        validate: { request: PostStandaloneAgentAPIKeyRequestSchema },
+        validate: {
+          request: PostStandaloneAgentAPIKeyRequestSchema,
+          response: {
+            200: {
+              body: () =>
+                schema.object({
+                  item: schema.object({
+                    id: schema.string(),
+                    api_key: schema.string(),
+                    name: schema.string(),
+                    encoded: schema.string(),
+                    expiration: schema.maybe(schema.number()),
+                  }),
+                }),
+            },
+          },
+        },
       },
       createStandaloneAgentApiKeyHandler
     );