diff --git a/README.md b/README.md
index ffc28dc..64a86f5 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@ BoxBrain is an IdentityDB-backed TypeScript framework for creating synthetic per
 The project is framework-first rather than product-first. The current core library provides:
 
 - provider-agnostic text, structured-output, image, conversation-memory, and special-date adapter contracts
+- ready-made xAI Grok text, structured-output, and image adapters
 - one IdentityDB memory space per persona
 - persona initialization from personality, history, values, preferences, and relationships
 - LLM-generated biography ingestion into IdentityDB fact drafts
@@ -21,7 +22,7 @@ The project is framework-first rather than product-first. The current core libra
 Still planned:
 
 - HTTP/RPC wrappers around the core library APIs
-- ready-made provider adapter packages for specific AI vendors
+- ready-made provider adapter packages for additional AI vendors
 - production-focused persistence/runtime integrations beyond the in-process core library
 
 ## Development
@@ -35,6 +36,6 @@ bun run build
 
 ## Current status
 
-The repository now contains the framework core for persona initialization, schedule/status management, and conversation orchestration. See the implementation plan:
+The repository now contains the framework core for persona initialization, schedule/status management, conversation orchestration, and a ready-made Grok adapter set. See the implementation plan:
 
 - `docs/plans/2026-05-11-boxbrain-foundation.md`
diff --git a/src/grok.ts b/src/grok.ts
new file mode 100644
index 0000000..7661744
--- /dev/null
+++ b/src/grok.ts
@@ -0,0 +1,274 @@
+import type {
+  ImageGenerationRequest,
+  ImageModelAdapter,
+  StructuredGenerationRequest,
+  StructuredModelAdapter,
+  TextGenerationRequest,
+  TextModelAdapter,
+} from './adapters';
+
+type GrokFetch = typeof fetch;
+
+type JsonObject = Record<string, unknown>;
+
+export interface GrokAdapterOptions {
+  apiKey: string;
+  model: string;
+  baseUrl?: string | undefined;
+  fetch?: GrokFetch | undefined;
+  extraHeaders?: Record<string, string> | undefined;
+}
+
+export interface GrokAdapterBundleOptions {
+  apiKey: string;
+  textModel: string;
+  structuredModel: string;
+  imageModel: string;
+  baseUrl?: string | undefined;
+  fetch?: GrokFetch | undefined;
+  extraHeaders?: Record<string, string> | undefined;
+}
+
+const DEFAULT_BASE_URL = 'https://api.x.ai/v1';
+const GROK_PROVIDER = 'xai-grok';
+
+export function createGrokTextModelAdapter(options: GrokAdapterOptions): TextModelAdapter {
+  const runtime = createRuntime(options);
+
+  return {
+    provider: GROK_PROVIDER,
+    model: options.model,
+    async generateText(request: TextGenerationRequest): Promise<string> {
+      const response = await runtime.postJson('/chat/completions', {
+        model: request.model ?? options.model,
+        messages: buildMessages(request.system, request.prompt),
+        temperature: request.temperature,
+        metadata: request.metadata,
+      });
+
+      return extractChatCompletionText(response);
+    },
+  };
+}
+
+export function createGrokStructuredModelAdapter<TSchema = unknown>(options: GrokAdapterOptions): StructuredModelAdapter<TSchema> {
+  const runtime = createRuntime(options);
+
+  return {
+    provider: GROK_PROVIDER,
+    model: options.model,
+    async generateObject<TOutput>(request: StructuredGenerationRequest<TSchema>): Promise<TOutput> {
+      const response = await runtime.postJson('/chat/completions', {
+        model: request.model ?? options.model,
+        messages: buildMessages(request.system, request.prompt),
+        temperature: request.temperature,
+        metadata: request.metadata,
+        response_format: request.schema
+          ? {
+              type: 'json_schema',
+              json_schema: {
+                name: 'boxbrain_structured_output',
+                schema: request.schema,
+              },
+            }
+          : { type: 'json_object' },
+      });
+
+      return parseStructuredOutput<TOutput>(extractChatCompletionText(response));
+    },
+  };
+}
+
+export function createGrokImageModelAdapter(options: GrokAdapterOptions): ImageModelAdapter {
+  const runtime = createRuntime(options);
+
+  return {
+    provider: GROK_PROVIDER,
+    model: options.model,
+    async generateImage(request: ImageGenerationRequest) {
+      const response = await runtime.postJson('/images/generations', {
+        model: request.model ?? options.model,
+        prompt: request.prompt,
+        aspect_ratio: mapAspectRatio(request.aspectRatio),
+        metadata: request.metadata,
+      });
+
+      const image = extractFirstImage(response);
+      return {
+        url: image.url,
+        revisedPrompt: image.revised_prompt,
+      };
+    },
+  };
+}
+
+export function createGrokAdapters(options: GrokAdapterBundleOptions): {
+  text: TextModelAdapter;
+  structured: StructuredModelAdapter;
+  image: ImageModelAdapter;
+} {
+  return {
+    text: createGrokTextModelAdapter({
+      apiKey: options.apiKey,
+      model: options.textModel,
+      baseUrl: options.baseUrl,
+      fetch: options.fetch,
+      extraHeaders: options.extraHeaders,
+    }),
+    structured: createGrokStructuredModelAdapter({
+      apiKey: options.apiKey,
+      model: options.structuredModel,
+      baseUrl: options.baseUrl,
+      fetch: options.fetch,
+      extraHeaders: options.extraHeaders,
+    }),
+    image: createGrokImageModelAdapter({
+      apiKey: options.apiKey,
+      model: options.imageModel,
+      baseUrl: options.baseUrl,
+      fetch: options.fetch,
+      extraHeaders: options.extraHeaders,
+    }),
+  };
+}
+
+function createRuntime(options: Pick<GrokAdapterOptions, 'apiKey' | 'baseUrl' | 'fetch' | 'extraHeaders'>): {
+  postJson: (path: string, body: JsonObject) => Promise<JsonObject>;
+} {
+  const baseUrl = (options.baseUrl ?? DEFAULT_BASE_URL).replace(/\/$/, '');
+  const fetchImpl = options.fetch ?? globalThis.fetch;
+  if (!fetchImpl) {
+    throw new Error('Grok adapter requires a fetch implementation.');
+  }
+
+  return {
+    async postJson(path, body) {
+      const response = await fetchImpl(`${baseUrl}${path}`, {
+        method: 'POST',
+        headers: {
+          authorization: `Bearer ${options.apiKey}`,
+          'content-type': 'application/json',
+          ...(options.extraHeaders ?? {}),
+        },
+        body: JSON.stringify(removeUndefined(body)),
+      });
+
+      const text = await response.text();
+      const parsed = text.length > 0 ? tryParseJson(text) : {};
+      if (!response.ok) {
+        throw new Error(`Grok API request failed (${response.status}): ${text}`);
+      }
+      if (!parsed || typeof parsed !== 'object' || Array.isArray(parsed)) {
+        throw new Error('Grok API response must be a JSON object.');
+      }
+
+      return parsed;
+    },
+  };
+}
+
+function buildMessages(system: string | undefined, prompt: string): Array<{ role: 'system' | 'user'; content: string }> {
+  const messages: Array<{ role: 'system' | 'user'; content: string }> = [];
+  if (system) {
+    messages.push({ role: 'system', content: system });
+  }
+  messages.push({ role: 'user', content: prompt });
+  return messages;
+}
+
+function extractChatCompletionText(response: JsonObject): string {
+  const choices = response.choices;
+  if (!Array.isArray(choices) || choices.length === 0) {
+    throw new Error('Grok chat completion response did not include choices.');
+  }
+
+  const firstChoice = choices[0];
+  if (!firstChoice || typeof firstChoice !== 'object' || Array.isArray(firstChoice)) {
+    throw new Error('Grok chat completion response choice was invalid.');
+  }
+
+  const message = (firstChoice as JsonObject).message;
+  if (!message || typeof message !== 'object' || Array.isArray(message)) {
+    throw new Error('Grok chat completion response did not include a message.');
+  }
+
+  const content = (message as JsonObject).content;
+  if (typeof content === 'string') {
+    return content;
+  }
+  if (Array.isArray(content)) {
+    return content
+      .map((part) => {
+        if (!part || typeof part !== 'object' || Array.isArray(part)) {
+          return '';
+        }
+        const text = (part as JsonObject).text;
+        return typeof text === 'string' ? text : '';
+      })
+      .join('')
+      .trim();
+  }
+
+  throw new Error('Grok chat completion response did not include text content.');
+}
+
+function parseStructuredOutput<TOutput>(text: string): TOutput {
+  const parsed = tryParseJson(text);
+  return parsed as TOutput;
+}
+
+function extractFirstImage(response: JsonObject): { url?: string; revised_prompt?: string } {
+  const data = response.data;
+  if (!Array.isArray(data) || data.length === 0) {
+    throw new Error('Grok image generation response did not include image data.');
+  }
+
+  const first = data[0];
+  if (!first || typeof first !== 'object' || Array.isArray(first)) {
+    throw new Error('Grok image generation response image entry was invalid.');
+  }
+
+  const url = (first as JsonObject).url;
+  const revisedPrompt = (first as JsonObject).revised_prompt;
+  const result: { url?: string; revised_prompt?: string } = {};
+
+  if (typeof url === 'string') {
+    result.url = url;
+  }
+
+  if (typeof revisedPrompt === 'string') {
+    result.revised_prompt = revisedPrompt;
+  }
+
+  return result;
+}
+
+function mapAspectRatio(aspectRatio: ImageGenerationRequest['aspectRatio']): string | undefined {
+  if (aspectRatio === 'square') {
+    return '1:1';
+  }
+  if (aspectRatio === 'portrait') {
+    return '3:4';
+  }
+  if (aspectRatio === 'landscape') {
+    return '16:9';
+  }
+  return undefined;
+}
+
+function removeUndefined(value: JsonObject): JsonObject {
+  return Object.fromEntries(Object.entries(value).filter(([, entry]) => entry !== undefined));
+}
+
+function tryParseJson(text: string): JsonObject {
+  try {
+    const parsed = JSON.parse(text) as unknown;
+    if (!parsed || typeof parsed !== 'object' || Array.isArray(parsed)) {
+      throw new Error('JSON value was not an object.');
+    }
+    return parsed as JsonObject;
+  } catch (error) {
+    const message = error instanceof Error ? error.message : String(error);
+    throw new Error(`Failed to parse Grok JSON response: ${message}`);
+  }
+}
diff --git a/src/index.ts b/src/index.ts
index 30b831e..9ca629b 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,6 +1,7 @@
 export * from './adapters';
 export * from './availability';
 export * from './conversation';
+export * from './grok';
 export * from './memory';
 export * from './persona';
 export * from './schedule';
diff --git a/tests/grok.test.ts b/tests/grok.test.ts
new file mode 100644
index 0000000..24f25d5
--- /dev/null
+++ b/tests/grok.test.ts
@@ -0,0 +1,147 @@
+import { describe, expect, it } from 'vitest';
+import {
+  createGrokAdapters,
+  createGrokImageModelAdapter,
+  createGrokStructuredModelAdapter,
+  createGrokTextModelAdapter,
+} from '../src';
+
+describe('Grok adapters', () => {
+  it('creates a text adapter that calls xAI chat completions', async () => {
+    const calls: Array<{ url: string; init?: RequestInit }> = [];
+    const adapter = createGrokTextModelAdapter({
+      apiKey: 'test-key',
+      model: 'grok-4.3-mini',
+      fetch: async (url, init) => {
+        calls.push({ url: String(url), ...(init ? { init } : {}) });
+        return new Response(JSON.stringify({
+          choices: [
+            {
+              message: {
+                content: 'hello from grok',
+              },
+            },
+          ],
+        }), {
+          status: 200,
+          headers: { 'content-type': 'application/json' },
+        });
+      },
+    });
+
+    await expect(adapter.generateText({
+      system: 'You are a helpful persona engine.',
+      prompt: 'Say hi.',
+      temperature: 0.3,
+    })).resolves.toBe('hello from grok');
+
+    expect(calls).toHaveLength(1);
+    expect(calls[0]?.url).toBe('https://api.x.ai/v1/chat/completions');
+    expect(calls[0]?.init?.method).toBe('POST');
+    expect(calls[0]?.init?.headers).toMatchObject({
+      authorization: 'Bearer test-key',
+      'content-type': 'application/json',
+    });
+
+    const body = JSON.parse(String(calls[0]?.init?.body));
+    expect(body.model).toBe('grok-4.3-mini');
+    expect(body.temperature).toBe(0.3);
+    expect(body.messages).toEqual([
+      { role: 'system', content: 'You are a helpful persona engine.' },
+      { role: 'user', content: 'Say hi.' },
+    ]);
+  });
+
+  it('creates a structured adapter that sends json_schema response_format and parses JSON', async () => {
+    const calls: Array<{ url: string; init?: RequestInit }> = [];
+    const adapter = createGrokStructuredModelAdapter({
+      apiKey: 'test-key',
+      model: 'grok-4.3',
+      fetch: async (url, init) => {
+        calls.push({ url: String(url), ...(init ? { init } : {}) });
+        return new Response(JSON.stringify({
+          choices: [
+            {
+              message: {
+                content: JSON.stringify({ biography: 'Born in Busan.' }),
+              },
+            },
+          ],
+        }), {
+          status: 200,
+          headers: { 'content-type': 'application/json' },
+        });
+      },
+    });
+
+    const schema = {
+      type: 'object',
+      required: ['biography'],
+      properties: { biography: { type: 'string' } },
+    };
+
+    await expect(adapter.generateObject<{ biography: string }>({
+      prompt: 'Write a biography.',
+      system: 'Return only JSON.',
+      schema,
+    })).resolves.toEqual({ biography: 'Born in Busan.' });
+
+    const body = JSON.parse(String(calls[0]?.init?.body));
+    expect(body.response_format).toEqual({
+      type: 'json_schema',
+      json_schema: {
+        name: 'boxbrain_structured_output',
+        schema,
+      },
+    });
+  });
+
+  it('creates an image adapter that calls xAI image generation with mapped aspect ratios', async () => {
+    const calls: Array<{ url: string; init?: RequestInit }> = [];
+    const adapter = createGrokImageModelAdapter({
+      apiKey: 'test-key',
+      model: 'grok-imagine-image-quality',
+      fetch: async (url, init) => {
+        calls.push({ url: String(url), ...(init ? { init } : {}) });
+        return new Response(JSON.stringify({
+          data: [{ url: 'https://cdn.x.ai/generated.png', revised_prompt: 'revised prompt' }],
+        }), {
+          status: 200,
+          headers: { 'content-type': 'application/json' },
+        });
+      },
+    });
+
+    await expect(adapter.generateImage({
+      prompt: 'A quiet portrait photo.',
+      aspectRatio: 'portrait',
+    })).resolves.toEqual({
+      url: 'https://cdn.x.ai/generated.png',
+      revisedPrompt: 'revised prompt',
+    });
+
+    expect(calls[0]?.url).toBe('https://api.x.ai/v1/images/generations');
+    const body = JSON.parse(String(calls[0]?.init?.body));
+    expect(body.aspect_ratio).toBe('3:4');
+    expect(body.model).toBe('grok-imagine-image-quality');
+  });
+
+  it('can create a bundled Grok adapter set with shared defaults', async () => {
+    const adapters = createGrokAdapters({
+      apiKey: 'bundle-key',
+      textModel: 'grok-4.3-mini',
+      structuredModel: 'grok-4.3',
+      imageModel: 'grok-imagine-image-quality',
+      fetch: async (_url, _init) => new Response(JSON.stringify({
+        choices: [{ message: { content: 'ok' } }],
+      }), {
+        status: 200,
+        headers: { 'content-type': 'application/json' },
+      }),
+    });
+
+    expect(adapters.text.provider).toBe('xai-grok');
+    expect(adapters.structured.model).toBe('grok-4.3');
+    expect(adapters.image.model).toBe('grok-imagine-image-quality');
+  });
+});
diff --git a/tests/public-api.test.ts b/tests/public-api.test.ts
index c37dc90..4403d50 100644
--- a/tests/public-api.test.ts
+++ b/tests/public-api.test.ts
@@ -1,5 +1,6 @@
 import { describe, expect, it } from 'vitest';
 import {
+  createGrokAdapters,
   createReplyDelay,
   createTypingDelay,
   generateSchedule,
@@ -38,7 +39,7 @@ describe('public API', () => {
     expect(fact.topics.map((topic) => topic.name)).toEqual(['Mina', 'quiet cafés']);
   });
 
-  it('exports schedule, conversation, and external special-date adapter contracts', () => {
+  it('exports schedule, conversation, Grok, and external special-date adapter contracts', () => {
     const specialDateProvider: SpecialDateProvider = {
       async listSpecialDates() {
         return [{ date: '2026-05-08', title: 'Parents Day' }];
@@ -47,6 +48,7 @@ describe('public API', () => {
 
     expect(typeof generateSchedule).toBe('function');
     expect(typeof replyToConversation).toBe('function');
+    expect(typeof createGrokAdapters).toBe('function');
     expect(specialDateProvider.listSpecialDates).toBeTypeOf('function');
   });
 });