Remove duplicated text content after streaming (#106)

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## 0.6.5
+
+- Fix for duplicated text content after streaming
+
+## 0.6.4
+
+- Support streaming partial messages!
+- Update to @anthropic-ai/claude-agent-sdk@v0.1.21
+
+## 0.6.3
+
+- Fix issue where slash commands were loaded before initialization was complete.
+
 ## 0.6.2
 
 - Fix bug where mode selection would sometimes fire before initialization was complete.

package-lock.json

@@ -1,18 +1,18 @@
 {
   "name": "@zed-industries/claude-code-acp",
-  "version": "0.6.2",
+  "version": "0.6.5",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@zed-industries/claude-code-acp",
-      "version": "0.6.2",
+      "version": "0.6.5",
       "license": "Apache-2.0",
       "dependencies": {
         "@agentclientprotocol/sdk": "0.4.8",
-        "@anthropic-ai/claude-agent-sdk": "0.1.19",
-        "@anthropic-ai/claude-code": "2.0.19",
-        "@modelcontextprotocol/sdk": "1.20.0",
+        "@anthropic-ai/claude-agent-sdk": "0.1.21",
+        "@anthropic-ai/claude-code": "2.0.21",
+        "@modelcontextprotocol/sdk": "1.20.1",
         "diff": "8.0.2",
         "express": "5.1.0",
         "minimist": "1.2.8",
@@ -22,10 +22,10 @@
         "claude-code-acp": "dist/index.js"
       },
       "devDependencies": {
-        "@anthropic-ai/sdk": "^0.66.0",
+        "@anthropic-ai/sdk": "^0.67.0",
         "@types/express": "5.0.3",
         "@types/minimist": "1.2.5",
-        "@types/node": "24.8.0",
+        "@types/node": "24.8.1",
         "@types/uuid": "10.0.0",
         "@typescript-eslint/eslint-plugin": "8.46.1",
         "@typescript-eslint/parser": "8.46.1",
@@ -49,9 +49,9 @@
       }
     },
     "node_modules/@anthropic-ai/claude-agent-sdk": {
-      "version": "0.1.19",
-      "resolved": "https://registry.npmjs.org/@anthropic-ai/claude-agent-sdk/-/claude-agent-sdk-0.1.19.tgz",
-      "integrity": "sha512-k4GtWygAkp3d0Npo/cS16MAfnSEcjttT5ijZzEWIzpWClL5wOYCpVyuMjnZGsYPDDZCb26pVb7Wm0ZDFj149Cg==",
+      "version": "0.1.21",
+      "resolved": "https://registry.npmjs.org/@anthropic-ai/claude-agent-sdk/-/claude-agent-sdk-0.1.21.tgz",
+      "integrity": "sha512-8qUD//GfS/SXHx2nnVOg4uwS2aqrULp/KKi6HvPqQpkTAOH0o393uWHNIi69WCshy9RLGO7NZWodlxTT3v+RdQ==",
       "license": "SEE LICENSE IN README.md",
       "engines": {
         "node": ">=18.0.0"
@@ -69,9 +69,9 @@
       }
     },
     "node_modules/@anthropic-ai/claude-code": {
-      "version": "2.0.19",
-      "resolved": "https://registry.npmjs.org/@anthropic-ai/claude-code/-/claude-code-2.0.19.tgz",
-      "integrity": "sha512-9InIRKliS3TaPbWfuzJA0SoC3hLQ0Lk2lmBVFBChgd8f6aTVV5dQwHNgDnLjtl1L+HhRfMqjSgBfNaeUmzet/A==",
+      "version": "2.0.21",
+      "resolved": "https://registry.npmjs.org/@anthropic-ai/claude-code/-/claude-code-2.0.21.tgz",
+      "integrity": "sha512-02NcxPVjioLjo4/djzIt4aAYkYqnZsHgdzgMexLURYLR9q1+B+OLkKddKwOHL8fas3WnUGV1oyybu73BfHqQ4A==",
       "license": "SEE LICENSE IN README.md",
       "bin": {
         "claude": "cli.js"
@@ -89,9 +89,9 @@
       }
     },
     "node_modules/@anthropic-ai/sdk": {
-      "version": "0.66.0",
-      "resolved": "https://registry.npmjs.org/@anthropic-ai/sdk/-/sdk-0.66.0.tgz",
-      "integrity": "sha512-GBSSby0P4BW/sOdvsTXaHJDPnGEL5tuB4TtsU4SXG7+dVULQ9MkKgNznCALDCgSV5yhrtQlctvEdMqePVIXTiw==",
+      "version": "0.67.0",
+      "resolved": "https://registry.npmjs.org/@anthropic-ai/sdk/-/sdk-0.67.0.tgz",
+      "integrity": "sha512-Buxbf6jYJ+pPtfCgXe1pcFtZmdXPrbdqhBjiscFt9irS1G0hCsmR/fPA+DwKTk4GPjqeNnnCYNecXH6uVZ4G/A==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -1066,9 +1066,9 @@
       }
     },
     "node_modules/@modelcontextprotocol/sdk": {
-      "version": "1.20.0",
-      "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-1.20.0.tgz",
-      "integrity": "sha512-kOQ4+fHuT4KbR2iq2IjeV32HiihueuOf1vJkq18z08CLZ1UQrTc8BXJpVfxZkq45+inLLD+D4xx4nBjUelJa4Q==",
+      "version": "1.20.1",
+      "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-1.20.1.tgz",
+      "integrity": "sha512-j/P+yuxXfgxb+mW7OEoRCM3G47zCTDqUPivJo/VzpjbG8I9csTXtOprCf5FfOfHK4whOJny0aHuBEON+kS7CCA==",
       "license": "MIT",
       "dependencies": {
         "ajv": "^6.12.6",
@@ -1568,9 +1568,9 @@
       "license": "MIT"
     },
     "node_modules/@types/node": {
-      "version": "24.8.0",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-24.8.0.tgz",
-      "integrity": "sha512-5x08bUtU8hfboMTrJ7mEO4CpepS9yBwAqcL52y86SWNmbPX8LVbNs3EP4cNrIZgdjk2NAlP2ahNihozpoZIxSg==",
+      "version": "24.8.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-24.8.1.tgz",
+      "integrity": "sha512-alv65KGRadQVfVcG69MuB4IzdYVpRwMG/mq8KWOaoOdyY617P5ivaDiMCGOFDWD2sAn5Q0mR3mRtUOgm99hL9Q==",
       "dev": true,
       "license": "MIT",
       "dependencies": {

package.json

@@ -6,7 +6,7 @@
   "bin": {
     "claude-code-acp": "./dist/index.js"
   },
-  "version": "0.6.2",
+  "version": "0.6.5",
   "description": "An ACP-compatible coding agent powered by the Claude Code SDK (TypeScript)",
   "main": "dist/index.js",
   "type": "module",
@@ -52,19 +52,19 @@
   "license": "Apache-2.0",
   "dependencies": {
     "@agentclientprotocol/sdk": "0.4.8",
-    "@anthropic-ai/claude-agent-sdk": "0.1.19",
-    "@anthropic-ai/claude-code": "2.0.19",
-    "@modelcontextprotocol/sdk": "1.20.0",
+    "@anthropic-ai/claude-agent-sdk": "0.1.21",
+    "@anthropic-ai/claude-code": "2.0.21",
+    "@modelcontextprotocol/sdk": "1.20.1",
     "diff": "8.0.2",
     "express": "5.1.0",
     "minimist": "1.2.8",
     "uuid": "13.0.0"
   },
   "devDependencies": {
-    "@anthropic-ai/sdk": "^0.66.0",
+    "@anthropic-ai/sdk": "^0.67.0",
     "@types/express": "5.0.3",
     "@types/minimist": "1.2.5",
-    "@types/node": "24.8.0",
+    "@types/node": "24.8.1",
     "@types/uuid": "10.0.0",
     "@typescript-eslint/eslint-plugin": "8.46.1",
     "@typescript-eslint/parser": "8.46.1",

src/acp-agent.ts

@@ -31,9 +31,8 @@ import {
   PermissionMode,
   Query,
   query,
-  SDKAssistantMessage,
+  SDKPartialAssistantMessage,
   SDKUserMessage,
-  SDKUserMessageReplay,
 } from "@anthropic-ai/claude-agent-sdk";
 import * as fs from "node:fs";
 import * as path from "node:path";
@@ -54,6 +53,8 @@ import {
   toolUpdateFromToolResult,
   ClaudePlanEntry,
 } from "./tools.js";
+import { ContentBlockParam } from "@anthropic-ai/sdk/resources";
+import { BetaContentBlock, BetaRawContentBlockDelta } from "@anthropic-ai/sdk/resources/beta.mjs";
 
 type Session = {
   query: Query;
@@ -74,7 +75,12 @@ type BackgroundTerminal =
     };
 
 type ToolUseCache = {
-  [key: string]: { type: "tool_use"; id: string; name: string; input: any };
+  [key: string]: {
+    type: "tool_use" | "server_tool_use" | "mcp_tool_use";
+    id: string;
+    name: string;
+    input: any;
+  };
 };
 
 const DEFAULT_MODEL_ID = "default";
@@ -190,6 +196,7 @@ export class ClaudeAcpAgent implements Agent {
 
     const options: Options = {
       cwd: params.cwd,
+      includePartialMessages: true,
       mcpServers,
       systemPrompt,
       settingSources: ["user", "project", "local"],
@@ -243,13 +250,15 @@ export class ClaudeAcpAgent implements Agent {
     };
 
     getAvailableSlashCommands(q).then((availableCommands) => {
-      this.client.sessionUpdate({
-        sessionId,
-        update: {
-          sessionUpdate: "available_commands_update",
-          availableCommands,
-        },
-      });
+      setTimeout(() => {
+        this.client.sessionUpdate({
+          sessionId,
+          update: {
+            sessionUpdate: "available_commands_update",
+            availableCommands,
+          },
+        });
+      }, 0);
     });
 
     return {
@@ -337,6 +346,17 @@ export class ClaudeAcpAgent implements Agent {
               return { stopReason: "refusal" };
           }
         }
+        case "stream_event": {
+          for (const notification of streamEventToAcpNotifications(
+            message,
+            params.sessionId,
+            this.toolUseCache,
+            this.fileContentCache,
+          )) {
+            await this.client.sessionUpdate(notification);
+          }
+          break;
+        }
         case "user":
         case "assistant": {
           if (this.sessions[params.sessionId].cancelled) {
@@ -376,8 +396,15 @@ export class ClaudeAcpAgent implements Agent {
             throw RequestError.authRequired();
           }
 
+          const content =
+            message.type === "assistant"
+              ? // Handled by stream events above
+                message.message.content.filter((item) => !["text", "thinking"].includes(item.type))
+              : message.message.content;
+
           for (const notification of toAcpNotifications(
-            message,
+            content,
+            message.message.role,
             params.sessionId,
             this.toolUseCache,
             this.fileContentCache,
@@ -613,20 +640,18 @@ function promptToClaude(prompt: PromptRequest): SDKUserMessage {
  * Only handles text, image, and thinking chunks for now.
  */
 export function toAcpNotifications(
-  message: SDKAssistantMessage | SDKUserMessage | SDKUserMessageReplay,
+  content: string | ContentBlockParam[] | BetaContentBlock[] | BetaRawContentBlockDelta[],
+  role: "assistant" | "user",
   sessionId: string,
   toolUseCache: ToolUseCache,
   fileContentCache: { [key: string]: string },
 ): SessionNotification[] {
-  const content = message.message.content;
-
   if (typeof content === "string") {
     return [
       {
         sessionId,
         update: {
-          sessionUpdate:
-            message.type === "assistant" ? "agent_message_chunk" : "user_message_chunk",
+          sessionUpdate: role === "assistant" ? "agent_message_chunk" : "user_message_chunk",
           content: {
             type: "text",
             text: content,
@@ -642,9 +667,9 @@ export function toAcpNotifications(
     let update: SessionNotification["update"] | null = null;
     switch (chunk.type) {
       case "text":
+      case "text_delta":
         update = {
-          sessionUpdate:
-            message.type === "assistant" ? "agent_message_chunk" : "user_message_chunk",
+          sessionUpdate: role === "assistant" ? "agent_message_chunk" : "user_message_chunk",
           content: {
             type: "text",
             text: chunk.text,
@@ -653,8 +678,7 @@ export function toAcpNotifications(
         break;
       case "image":
         update = {
-          sessionUpdate:
-            message.type === "assistant" ? "agent_message_chunk" : "user_message_chunk",
+          sessionUpdate: role === "assistant" ? "agent_message_chunk" : "user_message_chunk",
           content: {
             type: "image",
             data: chunk.source.type === "base64" ? chunk.source.data : "",
@@ -664,6 +688,7 @@ export function toAcpNotifications(
         };
         break;
       case "thinking":
+      case "thinking_delta":
         update = {
           sessionUpdate: "agent_thought_chunk",
           content: {
@@ -673,6 +698,8 @@ export function toAcpNotifications(
         };
         break;
       case "tool_use":
+      case "server_tool_use":
+      case "mcp_tool_use": {
         toolUseCache[chunk.id] = chunk;
         if (chunk.name === "TodoWrite") {
           update = {
@@ -695,8 +722,15 @@ export function toAcpNotifications(
           };
         }
         break;
+      }
 
-      case "tool_result": {
+      case "tool_result":
+      case "web_fetch_tool_result":
+      case "web_search_tool_result":
+      case "code_execution_tool_result":
+      case "bash_code_execution_tool_result":
+      case "text_editor_code_execution_tool_result":
+      case "mcp_tool_result": {
         const toolUse = toolUseCache[chunk.tool_use_id];
         if (!toolUse) {
           console.error(
@@ -709,15 +743,24 @@ export function toAcpNotifications(
           update = {
             toolCallId: chunk.tool_use_id,
             sessionUpdate: "tool_call_update",
-            status: chunk.is_error ? "failed" : "completed",
+            status: "is_error" in chunk && chunk.is_error ? "failed" : "completed",
             ...toolUpdateFromToolResult(chunk, toolUseCache[chunk.tool_use_id]),
           };
         }
         break;
       }
 
+      case "document":
+      case "search_result":
+      case "redacted_thinking":
+      case "input_json_delta":
+      case "citations_delta":
+      case "signature_delta":
+      case "container_upload":
+        break;
+
       default:
-        throw new Error("unhandled chunk type: " + chunk.type);
+        unreachable(chunk);
     }
     if (update) {
       output.push({ sessionId, update });
@@ -727,6 +770,49 @@ export function toAcpNotifications(
   return output;
 }
 
+export function streamEventToAcpNotifications(
+  message: SDKPartialAssistantMessage,
+  sessionId: string,
+  toolUseCache: ToolUseCache,
+  fileContentCache: { [key: string]: string },
+): SessionNotification[] {
+  const event = message.event;
+  switch (event.type) {
+    case "message_start":
+      return toAcpNotifications(
+        event.message.content,
+        event.message.role,
+        sessionId,
+        toolUseCache,
+        fileContentCache,
+      );
+    case "content_block_start":
+      return toAcpNotifications(
+        [event.content_block],
+        "assistant",
+        sessionId,
+        toolUseCache,
+        fileContentCache,
+      );
+    case "content_block_delta":
+      return toAcpNotifications(
+        [event.delta],
+        "assistant",
+        sessionId,
+        toolUseCache,
+        fileContentCache,
+      );
+    case "message_delta":
+    case "message_stop":
+    case "content_block_stop":
+      // do we need stop reason?
+      return [];
+
+    default:
+      unreachable(event);
+  }
+}
+
 export function runAcp() {
   const input = nodeToWebWritable(process.stdout);
   const output = nodeToWebReadable(process.stdin);

src/tests/acp-agent.test.ts

@@ -649,7 +649,9 @@ describe("tool conversions", () => {
       session_id: "d056596f-e328-41e9-badd-b07122ae5227",
       uuid: "b7c3330c-de8f-4bba-ac53-68c7f76ffeb5",
     };
-    expect(toAcpNotifications(received, "test", {}, {})).toStrictEqual([
+    expect(
+      toAcpNotifications(received.message.content, received.message.role, "test", {}, {}),
+    ).toStrictEqual([
       {
         sessionId: "test",
         update: {

src/tools.ts

@@ -1,6 +1,14 @@
 import { PlanEntry, ToolCallContent, ToolCallLocation, ToolKind } from "@agentclientprotocol/sdk";
 import { replaceAndCalculateLocation, SYSTEM_REMINDER, toolNames } from "./mcp-server.js";
-import { ToolResultBlockParam } from "@anthropic-ai/sdk/resources";
+import { ToolResultBlockParam, WebSearchToolResultBlockParam } from "@anthropic-ai/sdk/resources";
+import {
+  BetaBashCodeExecutionToolResultBlockParam,
+  BetaCodeExecutionToolResultBlockParam,
+  BetaRequestMCPToolResultBlockParam,
+  BetaTextEditorCodeExecutionToolResultBlockParam,
+  BetaWebFetchToolResultBlockParam,
+  BetaWebSearchToolResultBlockParam,
+} from "@anthropic-ai/sdk/resources/beta.mjs";
 
 interface ToolInfo {
   title: string;
@@ -385,7 +393,15 @@ export function toolInfoFromToolUse(
 }
 
 export function toolUpdateFromToolResult(
-  toolResult: ToolResultBlockParam,
+  toolResult:
+    | ToolResultBlockParam
+    | BetaWebSearchToolResultBlockParam
+    | BetaWebFetchToolResultBlockParam
+    | WebSearchToolResultBlockParam
+    | BetaCodeExecutionToolResultBlockParam
+    | BetaBashCodeExecutionToolResultBlockParam
+    | BetaTextEditorCodeExecutionToolResultBlockParam
+    | BetaRequestMCPToolResultBlockParam,
   toolUse: any | undefined,
 ): ToolUpdate {
   switch (toolUse?.name) {
@@ -425,7 +441,12 @@ export function toolUpdateFromToolResult(
     case toolNames.edit:
     case toolNames.write:
     case "Write": {
-      if (toolResult.is_error && toolResult.content && toolResult.content.length > 0) {
+      if (
+        "is_error" in toolResult &&
+        toolResult.is_error &&
+        toolResult.content &&
+        toolResult.content.length > 0
+      ) {
         // Only return errors
         return toAcpContentUpdate(toolResult.content, true);
       }
@@ -451,7 +472,10 @@ export function toolUpdateFromToolResult(
     case "WebSearch":
     case "Other":
     default: {
-      return toAcpContentUpdate(toolResult.content, toolResult.is_error);
+      return toAcpContentUpdate(
+        toolResult.content,
+        "is_error" in toolResult ? toolResult.is_error : false,
+      );
     }
   }
 }

src/utils.ts

@@ -76,7 +76,13 @@ export function nodeToWebReadable(nodeStream: Readable): ReadableStream<Uint8Arr
 }
 
 export function unreachable(value: never): never {
-  throw new Error(`Unexpected case: ${value}`);
+  let valueAsString;
+  try {
+    valueAsString = JSON.stringify(value);
+  } catch {
+    valueAsString = value;
+  }
+  throw new Error(`Unexpected case: ${valueAsString}`);
 }
 
 export function sleep(time: number): Promise<void> {