diff --git a/sdks/typescript-agent-sdk/src/types.ts b/sdks/typescript-agent-sdk/src/types.ts
new file mode 100644
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+++ b/sdks/typescript-agent-sdk/src/types.ts
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+/**
+ * Public types for @litellm/agent-sdk.
+ *
+ * These mirror the wire shapes posted by Epic A on LIT-2880. When A1
+ * publishes the canonical OpenAPI/wire-shape comment, regenerate the
+ * `Wire*` aliases below; the public surface (Agent/Session/Run) should
+ * remain stable.
+ */
+
+/** Configuration shared by every SDK call. */
+export interface ClientOptions {
+  /** LiteLLM API key. Falls back to `process.env.LITELLM_API_KEY`. */
+  apiKey?: string;
+  /** Base URL of the LiteLLM proxy. Defaults to `https://api.litellm.ai`. */
+  baseUrl?: string;
+  /** Optional fetch override for tests / custom transports. */
+  fetch?: typeof fetch;
+  /** Default request timeout (ms). Default: 60_000. */
+  timeoutMs?: number;
+  /** Max retry attempts on retryable errors. Default: 3. */
+  maxRetries?: number;
+}
+
+/** Pagination args accepted by `list*` methods. */
+export interface ListOptions {
+  limit?: number;
+  cursor?: string;
+}
+
+export interface ListResult<T> {
+  items: T[];
+  nextCursor?: string;
+}
+
+/** Used to identify the model an agent should run on. */
+export interface ModelRef {
+  /** LiteLLM model ID, e.g. `claude-4.6-sonnet`. */
+  id: string;
+}
+
+/** Image attachment passed to `session.send`. */
+export interface SDKImage {
+  /** Either a data URL or an https URL. */
+  url: string;
+  /** Optional MIME type hint. */
+  mimeType?: string;
+}
+
+/** Args accepted by `Agent.create`. */
+export interface AgentCreateOptions extends ClientOptions {
+  name: string;
+  model: ModelRef;
+  systemPrompt?: string;
+  /** Free-form tags / metadata persisted on the agent definition. */
+  metadata?: Record<string, string>;
+}
+
+/** Args accepted by `agent.createSession`. */
+export interface CreateSessionOptions {
+  /** Repos to clone into the session VM. */
+  repos?: { url: string; startingRef?: string }[];
+  /** Environment variables surfaced to the VM. */
+  envVars?: Record<string, string>;
+  /** Free-form tags / metadata persisted on the session. */
+  metadata?: Record<string, string>;
+}
+
+export type SessionStatus =
+  | "pending"
+  | "running"
+  | "idle"
+  | "terminated"
+  | "failed";
+
+export type RunStatus =
+  | "queued"
+  | "running"
+  | "completed"
+  | "failed"
+  | "cancelled";
+
+/** Lightweight info returned by list endpoints. */
+export interface AgentInfo {
+  id: string;
+  name: string;
+  model: ModelRef;
+  createdAt: string;
+}
+
+export interface SessionInfo {
+  id: string;
+  agentId: string;
+  status: SessionStatus;
+  createdAt: string;
+}
+
+export interface RunInfo {
+  id: string;
+  sessionId: string;
+  status: RunStatus;
+  result: string | null;
+  startedAt: string | null;
+  completedAt: string | null;
+  git?: { branches: { branch: string; prUrl: string | null }[] };
+}
+
+export interface ConversationTurn {
+  role: "user" | "assistant" | "system" | "tool";
+  content: string;
+  runId?: string;
+  createdAt: string;
+}
+
+export interface Message extends ConversationTurn {}
+
+/** Streamed event off `run.stream()`. */
+export interface RunEvent {
+  /** Monotonic per-run sequence; required for resume. */
+  seq: number;
+  type:
+    | "delta"
+    | "tool_call"
+    | "tool_result"
+    | "status"
+    | "done"
+    | "error"
+    | string;
+  data: unknown;
+}
+
+/** Resolved value from `run.wait()`. */
+export interface RunResult {
+  id: string;
+  status: RunStatus;
+  result: string | null;
+  git?: { branches: { branch: string; prUrl: string | null }[] };
+}
+
+/** Error thrown by the SDK. Mirrors Cursor SDK's `CursorAgentError` shape. */
+export class LiteLLMAgentError extends Error {
+  /** Stable machine-readable code, e.g. `not_found`, `rate_limited`. */
+  code: string;
+  /** HTTP status, when applicable. */
+  status?: number;
+  /** Whether the call is safe to retry. */
+  retryable: boolean;
+
+  constructor(
+    message: string,
+    options: { code: string; status?: number; retryable?: boolean } = {
+      code: "unknown",
+    }
+  ) {
+    super(message);
+    this.name = "LiteLLMAgentError";
+    this.code = options.code;
+    this.status = options.status;
+    this.retryable = options.retryable ?? false;
+  }
+}