diff --git a/CHANGELOG.md b/CHANGELOG.md
index aa87326..e8c795d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,26 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.1.3]
+
+### Removed
+
+- **Breaking**: `client.outboundConversations.start()` and
+  `StartOutboundConversationParams`, following the removal of
+  `POST /outbound/conversations` from the API.
+- **Breaking**: the `customer_source` field on outbound conversation start. It
+  has no replacement — `customer_id` is now always your own customer ID, and
+  third-party platform IDs go in `customer_support_platform_identifiers`.
+
+### Added
+
+- `client.outboundConversations.startChat()`, `.startEmail()` and
+  `.startPhone()`, one per channel, with
+  `StartOutboundChatConversationParams`, `StartOutboundEmailConversationParams`
+  and `StartOutboundPhoneConversationParams`. `support_platform` is now required
+  on chat and email; phone takes `to_phone_number` and `from_phone_number`
+  instead.
+
 ## [Unreleased]
 
 ### Added
diff --git a/README.md b/README.md
index ede9cdf..56d4f98 100644
--- a/README.md
+++ b/README.md
@@ -97,6 +97,51 @@ const page = await client.procedures.list();
 const next = await client.procedures.list({ cursor: page.pageInfo.next });
 ```
 
+## Outbound conversations
+
+`client.outboundConversations` starts conversations the AI agent initiates, one
+method per channel. All three return `{ conversation_id }`.
+
+```ts
+// Live chat — support_platform is required.
+await client.outboundConversations.startChat({
+  customer_id: "customer-678",
+  procedure_id: "proc_abc",
+  support_platform: "intercom",
+  body: "Hi! Your order has shipped.", // optional; the agent writes one if omitted
+  customer_support_platform_identifiers: [
+    { support_platform: "intercom", type: "intercom_user", value: "6953e162a988d9ef0f73ef9b" },
+  ],
+});
+
+// Email — subject and body must be supplied together, or both omitted.
+await client.outboundConversations.startEmail({
+  customer_id: "customer-678",
+  procedure_id: "proc_abc",
+  support_platform: "zendesk",
+  subject: "Your recent order",
+  body: "Your order has shipped.",
+  customer_support_platform_identifiers: [
+    { support_platform: "zendesk", type: "zendesk_support_user", value: "42" },
+  ],
+});
+
+// Phone — no support_platform; the call is placed over voice.
+await client.outboundConversations.startPhone({
+  customer_id: "customer-678",
+  procedure_id: "proc_abc",
+  to_phone_number: "+14155551234",
+  from_phone_number: "+14155559876", // must be provisioned for your company
+});
+```
+
+`customer_id` is always your own identifier for the customer. Third-party
+platform IDs go in `customer_support_platform_identifiers`, keyed by platform —
+Zendesk requires type `zendesk_support_user` and Salesforce
+`salesforce_contact_id`. The platform the message is delivered on needs an
+identifier there, unless the customer already carries one from an earlier
+conversation.
+
 ## Webhook verification
 
 Construct the client with your `webhookSigningKey`, then verify and parse
diff --git a/package.json b/package.json
index d1498e1..6cf6d8c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@gradientlabs/client",
-  "version": "0.1.2",
+  "version": "0.1.3",
   "description": "Official Node.js / TypeScript client for the Gradient Labs API",
   "type": "module",
   "engines": {
diff --git a/src/internal/version.ts b/src/internal/version.ts
index b8fa277..e0d9673 100644
--- a/src/internal/version.ts
+++ b/src/internal/version.ts
@@ -1,2 +1,2 @@
 // Kept in sync with the "version" field in package.json.
-export const VERSION = "0.1.2";
+export const VERSION = "0.1.3";
diff --git a/src/models/conversations.ts b/src/models/conversations.ts
index b56ffb8..4ce93c1 100644
--- a/src/models/conversations.ts
+++ b/src/models/conversations.ts
@@ -1,5 +1,5 @@
 import type { Attachment, CustomerSupportPlatformIdentifier } from "./common.js";
-import type { Channel, ConversationEventType, CustomerSource, ParticipantType } from "./enums.js";
+import type { Channel, ConversationEventType, ParticipantType, SupportPlatform } from "./enums.js";
 
 /** Agent-derived metadata about how a conversation was processed. */
 export interface AgentMetadata {
@@ -133,17 +133,78 @@ export interface ReadConversationParams {
   support_platform?: string;
 }
 
-export interface StartOutboundConversationParams {
+/** Fields shared by every outbound conversation start request. */
+interface StartOutboundConversationParamsBase {
+  /**
+   * Your own identifier for the customer, as used in your systems. It is stored
+   * as the customer's company customer ID and is echoed back to you in tool and
+   * webhook payloads.
+   */
   customer_id: string;
-  customer_source: CustomerSource;
+  /**
+   * ID of the outbound procedure that defines what the AI agent should
+   * accomplish. It must be of type "outbound", live (deployed), and enabled for
+   * this channel.
+   */
   procedure_id: string;
-  channel?: Channel;
-  support_platform?: string;
-  body?: string;
-  subject?: string;
+  /**
+   * Optional identifiers linking the customer to their record(s) in third-party
+   * support platforms (e.g. Intercom, Zendesk, Salesforce). Added to the
+   * customer alongside customer_id, and used to match against customers created
+   * via those platforms' native integrations.
+   */
+  customer_support_platform_identifiers?: CustomerSupportPlatformIdentifier[];
+  /** Structured context data the AI agent can use, keyed by resource type. */
   resources?: Record<string, unknown>;
 }
 
+export interface StartOutboundChatConversationParams extends StartOutboundConversationParamsBase {
+  /**
+   * The platform the chat is delivered on. It needs an identifier for the
+   * customer in `customer_support_platform_identifiers`, unless the customer
+   * already carries one from an earlier conversation.
+   */
+  support_platform: SupportPlatform;
+  /**
+   * Content of the opening message. If omitted, the AI agent generates one
+   * based on the procedure.
+   */
+  body?: string;
+}
+
+/** Opening email content: subject and body must be supplied together, or both omitted. */
+type OutboundEmailOpeningMessage =
+  | {
+      /** Subject line for the opening email. */
+      subject: string;
+      /** Content of the opening email. */
+      body: string;
+    }
+  | {
+      subject?: never;
+      body?: never;
+    };
+
+export type StartOutboundEmailConversationParams = StartOutboundConversationParamsBase & {
+  /**
+   * The platform the email is sent from. It needs an identifier for the
+   * customer in `customer_support_platform_identifiers`, unless the customer
+   * already carries one from an earlier conversation. Zendesk requires type
+   * "zendesk_support_user"; Salesforce requires type "salesforce_contact_id".
+   */
+  support_platform: SupportPlatform;
+} & OutboundEmailOpeningMessage;
+
+export interface StartOutboundPhoneConversationParams extends StartOutboundConversationParamsBase {
+  /** The customer's phone number to dial, in E.164 format (e.g. "+14155551234"). */
+  to_phone_number: string;
+  /**
+   * The caller ID to place the call from, in E.164 format. Must be a phone
+   * number already provisioned for your company.
+   */
+  from_phone_number: string;
+}
+
 export interface OutboundConversation {
   conversation_id: string;
 }
diff --git a/src/resources/outbound-conversations.ts b/src/resources/outbound-conversations.ts
index aa55815..aa11b14 100644
--- a/src/resources/outbound-conversations.ts
+++ b/src/resources/outbound-conversations.ts
@@ -2,21 +2,60 @@ import type { HttpClient } from "../internal/http.js";
 import type { RequestConfig } from "../request-config.js";
 import type {
   OutboundConversation,
-  StartOutboundConversationParams,
+  StartOutboundChatConversationParams,
+  StartOutboundEmailConversationParams,
+  StartOutboundPhoneConversationParams,
 } from "../models/conversations.js";
 
 /**
- * Outbound conversation endpoints. Requires an Integration API key.
+ * Outbound conversation endpoints, where the AI agent proactively initiates
+ * contact with a customer following an outbound procedure. Requires an
+ * Integration API key.
+ *
+ * The customer is created, or matched to an existing record, from `customer_id`
+ * and any `customer_support_platform_identifiers` supplied.
  */
 export class OutboundConversations {
   constructor(private readonly http: HttpClient) {}
 
-  /** Creates and starts a new outbound conversation initiated by the AI agent. */
-  start(
-    params: StartOutboundConversationParams,
+  /**
+   * Creates and starts an outbound live chat conversation. Pass `body` to send
+   * a specific opening message, otherwise the AI agent writes one.
+   */
+  startChat(
+    params: StartOutboundChatConversationParams,
     config: RequestConfig = {},
   ): Promise<OutboundConversation> {
-    return this.http.request("POST", "outbound/conversations", {
+    return this.http.request("POST", "outbound/conversations/chat", {
+      body: params,
+      signal: config.signal,
+    });
+  }
+
+  /**
+   * Creates and starts an outbound email conversation. Pass `subject` and
+   * `body` together to send a specific opening email, otherwise the AI agent
+   * writes one.
+   */
+  startEmail(
+    params: StartOutboundEmailConversationParams,
+    config: RequestConfig = {},
+  ): Promise<OutboundConversation> {
+    return this.http.request("POST", "outbound/conversations/email", {
+      body: params,
+      signal: config.signal,
+    });
+  }
+
+  /**
+   * Places an outbound phone call. `from_phone_number` must be a number already
+   * provisioned for your company.
+   */
+  startPhone(
+    params: StartOutboundPhoneConversationParams,
+    config: RequestConfig = {},
+  ): Promise<OutboundConversation> {
+    return this.http.request("POST", "outbound/conversations/phone", {
       body: params,
       signal: config.signal,
     });
diff --git a/test/http.test.ts b/test/http.test.ts
index f17eee2..c330c20 100644
--- a/test/http.test.ts
+++ b/test/http.test.ts
@@ -34,6 +34,8 @@ const conversationJson = JSON.stringify({
   latest_handoff_target: "",
 });
 
+const outboundJson = JSON.stringify({ conversation_id: "conv_out_1" });
+
 describe("HttpClient", () => {
   it("sets the Authorization bearer header on every request", async () => {
     const record: RecordedRequest[] = [];
@@ -154,6 +156,95 @@ describe("HttpClient", () => {
     expect(record[0]!.body).toBeUndefined();
   });
 
+  it("starts an outbound chat conversation", async () => {
+    const record: RecordedRequest[] = [];
+    const client = new GradientLabs({
+      apiKey: "sk_test_123",
+      fetch: fakeFetch({ status: 200, body: outboundJson }, record),
+    });
+
+    const result = await client.outboundConversations.startChat({
+      customer_id: "cust_1",
+      procedure_id: "proc_1",
+      support_platform: "intercom",
+      body: "Hi, just checking in about your order.",
+      customer_support_platform_identifiers: [
+        { support_platform: "intercom", type: "intercom_user", value: "6953e162a988d9ef0f73ef9b" },
+      ],
+    });
+
+    expect(result.conversation_id).toBe("conv_out_1");
+    expect(record[0]!.method).toBe("POST");
+    expect(record[0]!.input).toBe("https://api.gradient-labs.ai/outbound/conversations/chat");
+    const body = JSON.parse(record[0]!.body!);
+    expect(body.support_platform).toBe("intercom");
+    expect(body.body).toBe("Hi, just checking in about your order.");
+    expect(body.customer_support_platform_identifiers).toHaveLength(1);
+  });
+
+  it("starts an outbound email conversation with a subject and body", async () => {
+    const record: RecordedRequest[] = [];
+    const client = new GradientLabs({
+      apiKey: "sk_test_123",
+      fetch: fakeFetch({ status: 200, body: outboundJson }, record),
+    });
+
+    await client.outboundConversations.startEmail({
+      customer_id: "cust_1",
+      procedure_id: "proc_1",
+      support_platform: "zendesk",
+      subject: "Your recent order",
+      body: "Your order has shipped.",
+      customer_support_platform_identifiers: [
+        { support_platform: "zendesk", type: "zendesk_support_user", value: "42" },
+      ],
+    });
+
+    expect(record[0]!.input).toBe("https://api.gradient-labs.ai/outbound/conversations/email");
+    const body = JSON.parse(record[0]!.body!);
+    expect(body.subject).toBe("Your recent order");
+    expect(body.body).toBe("Your order has shipped.");
+  });
+
+  it("starts an outbound email conversation without an opening message", async () => {
+    const record: RecordedRequest[] = [];
+    const client = new GradientLabs({
+      apiKey: "sk_test_123",
+      fetch: fakeFetch({ status: 200, body: outboundJson }, record),
+    });
+
+    await client.outboundConversations.startEmail({
+      customer_id: "cust_1",
+      procedure_id: "proc_1",
+      support_platform: "zendesk",
+    });
+
+    const body = JSON.parse(record[0]!.body!);
+    expect(body.subject).toBeUndefined();
+    expect(body.body).toBeUndefined();
+  });
+
+  it("starts an outbound phone conversation", async () => {
+    const record: RecordedRequest[] = [];
+    const client = new GradientLabs({
+      apiKey: "sk_test_123",
+      fetch: fakeFetch({ status: 200, body: outboundJson }, record),
+    });
+
+    await client.outboundConversations.startPhone({
+      customer_id: "cust_1",
+      procedure_id: "proc_1",
+      to_phone_number: "+14155551234",
+      from_phone_number: "+14155559876",
+    });
+
+    expect(record[0]!.input).toBe("https://api.gradient-labs.ai/outbound/conversations/phone");
+    const body = JSON.parse(record[0]!.body!);
+    expect(body.to_phone_number).toBe("+14155551234");
+    expect(body.from_phone_number).toBe("+14155559876");
+    expect(body.support_platform).toBeUndefined();
+  });
+
   it("respects a custom base URL", async () => {
     const record: RecordedRequest[] = [];
     const client = new GradientLabs({