chore: update acp sdk

bun.lock

@@ -361,7 +361,7 @@
       "dependencies": {
         "@actions/core": "1.11.1",
         "@actions/github": "6.0.1",
-        "@agentclientprotocol/sdk": "0.16.1",
+        "@agentclientprotocol/sdk": "0.21.0",
         "@ai-sdk/alibaba": "1.0.17",
         "@ai-sdk/amazon-bedrock": "4.0.96",
         "@ai-sdk/anthropic": "3.0.71",
@@ -754,7 +754,7 @@
 
     "@adobe/css-tools": ["@adobe/css-tools@4.4.4", "", {}, "sha512-Elp+iwUx5rN5+Y8xLt5/GRoG20WGoDCQ/1Fb+1LiGtvwbDavuSk0jhD/eZdckHAuzcDzccnkv+rEjyWfRx18gg=="],
 
-    "@agentclientprotocol/sdk": ["@agentclientprotocol/sdk@0.16.1", "", { "peerDependencies": { "zod": "^3.25.0 || ^4.0.0" } }, "sha512-1ad+Sc/0sCtZGHthxxvgEUo5Wsbw16I+aF+YwdiLnPwkZG8KAGUEAPK6LM6Pf69lCyJPt1Aomk1d+8oE3C4ZEw=="],
+    "@agentclientprotocol/sdk": ["@agentclientprotocol/sdk@0.21.0", "", { "peerDependencies": { "zod": "^3.25.0 || ^4.0.0" } }, "sha512-ONj+Q8qOdNQp5XbH5jnMwzT9IKZJsSN0p0lkceS4GtUtNOPVLpNzSS8gqQdGMKfBvA0ESbkL8BTaSN1Rc9miEw=="],
 
     "@ai-sdk/alibaba": ["@ai-sdk/alibaba@1.0.17", "", { "dependencies": { "@ai-sdk/openai-compatible": "2.0.41", "@ai-sdk/provider": "3.0.8", "@ai-sdk/provider-utils": "4.0.23" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-ZbE+U5bWz2JBc5DERLowx5+TKbjGBE93LqKZAWvuEn7HOSQMraxFMZuc0ST335QZJAyfBOzh7m1mPQ+y7EaaoA=="],
 

packages/opencode/package.json

@@ -80,7 +80,7 @@
   "dependencies": {
     "@actions/core": "1.11.1",
     "@actions/github": "6.0.1",
-    "@agentclientprotocol/sdk": "0.16.1",
+    "@agentclientprotocol/sdk": "0.21.0",
     "@ai-sdk/alibaba": "1.0.17",
     "@ai-sdk/amazon-bedrock": "4.0.96",
     "@ai-sdk/anthropic": "3.0.71",

packages/opencode/src/acp/agent.ts

@@ -5,6 +5,8 @@ import {
   type AuthenticateRequest,
   type AuthMethod,
   type CancelNotification,
+  type CloseSessionRequest,
+  type CloseSessionResponse,
   type ForkSessionRequest,
   type ForkSessionResponse,
   type InitializeRequest,
@@ -565,6 +567,7 @@ export class Agent implements ACPAgent {
           image: true,
         },
         sessionCapabilities: {
+          close: {},
           fork: {},
           list: {},
           resume: {},
@@ -797,7 +800,7 @@ export class Agent implements ACPAgent {
     }
   }
 
-  async unstable_resumeSession(params: ResumeSessionRequest): Promise<ResumeSessionResponse> {
+  async resumeSession(params: ResumeSessionRequest): Promise<ResumeSessionResponse> {
     const directory = params.cwd
     const sessionId = params.sessionId
     const mcpServers = params.mcpServers ?? []
@@ -828,6 +831,27 @@ export class Agent implements ACPAgent {
     }
   }
 
+  async closeSession(params: CloseSessionRequest): Promise<CloseSessionResponse> {
+    const session = this.sessionManager.remove(params.sessionId)
+    if (!session) return {}
+
+    await this.sdk.session
+      .abort(
+        {
+          sessionID: params.sessionId,
+          directory: session.cwd,
+        },
+        { throwOnError: true },
+      )
+      .catch((error) => {
+        log.error("failed to abort session while closing ACP session", { error, sessionID: params.sessionId })
+      })
+
+    this.permissionQueues.delete(params.sessionId)
+    log.info("close_session", { sessionId: params.sessionId })
+    return {}
+  }
+
   private async processMessage(message: SessionMessageResponse) {
     log.debug("process message", message)
     if (message.info.role !== "assistant" && message.info.role !== "user") return

packages/opencode/src/acp/session.ts

@@ -113,4 +113,10 @@ export class ACPSessionManager {
     this.sessions.set(sessionId, session)
     return session
   }
+
+  remove(sessionId: string): ACPSessionState | undefined {
+    const session = this.sessions.get(sessionId)
+    this.sessions.delete(sessionId)
+    return session
+  }
 }

packages/opencode/test/acp/agent-interface.test.ts

@@ -34,10 +34,11 @@ describe("acp.agent interface compliance", () => {
     "loadSession",
     "setSessionMode",
     "authenticate",
-    // Unstable - SDK checks these with unstable_ prefix
+    // Capability-gated methods checked by the SDK router
     "listSessions",
+    "resumeSession",
+    "closeSession",
     "unstable_forkSession",
-    "unstable_resumeSession",
     "unstable_setSessionModel",
   ]