[agent] revert: remove anthropic-sdk adapter — Agent SDK path not viable, raw fetch is correct

- Remove @anthropic-ai/sdk dependency
- Remove src/adapters/anthropic-sdk.ts
- Remove executeStream from ProviderAdapter interface and server.ts
- Restore original buildRequest → fetch → parseStream flow

Author: lidge-jun

bun.lock

@@ -29,7 +29,6 @@
     "release:watch": "bun scripts/release.ts watch"
   },
   "dependencies": {
-    "@anthropic-ai/sdk": "^0.105.0",
     "zod": "^4.0.0"
   },
   "devDependencies": {

package.json

@@ -17,8 +17,4 @@ export interface ProviderAdapter {
 
   parseStream(response: Response): AsyncGenerator<AdapterEvent>;
   parseResponse?(response: Response): Promise<AdapterEvent[]>;
-
-  /** Optional: adapter handles its own fetch + streaming via a provider SDK. When present,
-   *  server.ts uses this instead of buildRequest → fetch → parseStream. */
-  executeStream?(parsed: OcxParsedRequest, signal?: AbortSignal): AsyncGenerator<AdapterEvent>;
 }

src/adapters/anthropic-sdk.ts

@@ -1,7 +1,6 @@
 import { existsSync, readFileSync } from "node:fs";
 import { extname, join } from "node:path";
 import { createAnthropicAdapter } from "./adapters/anthropic";
-import { createAnthropicSdkAdapter } from "./adapters/anthropic-sdk";
 import { createAzureAdapter } from "./adapters/azure";
 import { createGoogleAdapter } from "./adapters/google";
 import { createOpenAIChatAdapter } from "./adapters/openai-chat";
@@ -105,8 +104,6 @@ export function resolveAdapter(providerConfig: OcxProviderConfig) {
       return createOpenAIChatAdapter(providerConfig);
     case "anthropic":
       return createAnthropicAdapter(providerConfig);
-    case "anthropic-sdk":
-      return createAnthropicSdkAdapter(providerConfig);
     case "openai-responses":
       return createResponsesPassthroughAdapter(providerConfig);
     case "google":
@@ -224,27 +221,6 @@ async function handleResponses(
   const upstream = new AbortController();
   linkAbortSignal(upstream, options.abortSignal);
 
-  if (parsed.stream && adapter.executeStream) {
-    const eventStream = adapter.executeStream(parsed, upstream.signal);
-    const toolNsMap = new Map<string, { namespace: string; name: string }>();
-    const freeformToolNames = new Set<string>();
-    const toolSearchToolNames = new Set<string>();
-    for (const t of parsed.context.tools ?? []) {
-      if (t.namespace) toolNsMap.set(namespacedToolName(t.namespace, t.name), { namespace: t.namespace, name: t.name });
-      if (t.freeform) freeformToolNames.add(t.name);
-      if (t.toolSearch) toolSearchToolNames.add(t.name);
-    }
-    const sseStream = bridgeToResponsesSSE(
-      eventStream, parsed.modelId, toolNsMap, freeformToolNames, toolSearchToolNames,
-      () => upstream.abort(), 2_000,
-      options.forceEmptyResponseId ? { responseId: "" } : undefined,
-    );
-    return new Response(sseStream, {
-      headers: { "Content-Type": "text/event-stream", "Cache-Control": "no-cache", "Connection": "keep-alive", "X-Accel-Buffering": "no" },
-    });
-  }
-
-  // Fallback: buildRequest → fetch → parseStream (used by all non-SDK adapters and web-search sidecar)
   const request = adapter.buildRequest(parsed, { headers: req.headers });
   let upstreamResponse: Response;
   try {