feat(claude-local): add Bedrock model selection support

Previously, --model was completely skipped for Bedrock users, so the
model dropdown selection was silently ignored and the CLI always used
its default model.  Selecting Haiku would still run Opus.

- Add listClaudeModels() that returns Bedrock-native model IDs
  (us.anthropic.*) when Bedrock env is detected
- Register listModels on claude_local adapter so the UI dropdown
  shows Bedrock models instead of Anthropic API names
- Allow --model to pass through when the ID is a Bedrock-native
  identifier (us.anthropic.* or ARN)
- Add isBedrockModelId() helper shared by execute.ts and test.ts

Follows up on #2793 which added basic Bedrock auth detection.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/adapters/claude-local/src/server/execute.ts

@@ -32,6 +32,7 @@ import {
   isClaudeUnknownSessionError,
 } from "./parse.js";
 import { resolveClaudeDesiredSkillNames } from "./skills.js";
+import { isBedrockModelId } from "./models.js";
 
 const __moduleDir = path.dirname(fileURLToPath(import.meta.url));
 
@@ -439,9 +440,12 @@ export async function execute(ctx: AdapterExecutionContext): Promise<AdapterExec
     if (resumeSessionId) args.push("--resume", resumeSessionId);
     if (dangerouslySkipPermissions) args.push("--dangerously-skip-permissions");
     if (chrome) args.push("--chrome");
-    // Skip --model for Bedrock: Anthropic-style model IDs (e.g. "claude-opus-4-6") are not
-    // valid Bedrock model identifiers.  Let the CLI use its own configured model instead.
-    if (model && !isBedrockAuth(effectiveEnv)) args.push("--model", model);
+    // For Bedrock: only pass --model when the ID is a Bedrock-native identifier
+    // (e.g. "us.anthropic.*" or ARN). Anthropic-style IDs like "claude-opus-4-6" are invalid
+    // on Bedrock, so skip them and let the CLI use its own configured model.
+    if (model && (!isBedrockAuth(effectiveEnv) || isBedrockModelId(model))) {
+      args.push("--model", model);
+    }
     if (effort) args.push("--effort", effort);
     if (maxTurns > 0) args.push("--max-turns", String(maxTurns));
     if (effectiveInstructionsFilePath) {

packages/adapters/claude-local/src/server/index.ts

@@ -1,5 +1,6 @@
 export { execute, runClaudeLogin } from "./execute.js";
 export { listClaudeSkills, syncClaudeSkills } from "./skills.js";
+export { listClaudeModels } from "./models.js";
 export { testEnvironment } from "./test.js";
 export {
   parseClaudeStreamJson,

packages/adapters/claude-local/src/server/models.ts

@@ -0,0 +1,40 @@
+import type { AdapterModel } from "@paperclipai/adapter-utils";
+
+/** Anthropic direct API model IDs — used when Bedrock is not active. */
+const DIRECT_MODELS: AdapterModel[] = [
+  { id: "claude-opus-4-6", label: "Claude Opus 4.6" },
+  { id: "claude-sonnet-4-6", label: "Claude Sonnet 4.6" },
+  { id: "claude-haiku-4-6", label: "Claude Haiku 4.6" },
+  { id: "claude-sonnet-4-5-20250929", label: "Claude Sonnet 4.5" },
+  { id: "claude-haiku-4-5-20251001", label: "Claude Haiku 4.5" },
+];
+
+/** AWS Bedrock model IDs — region-qualified identifiers required by the Bedrock API. */
+const BEDROCK_MODELS: AdapterModel[] = [
+  { id: "us.anthropic.claude-opus-4-6-v1", label: "Bedrock Opus 4.6" },
+  { id: "us.anthropic.claude-sonnet-4-5-20250929-v2:0", label: "Bedrock Sonnet 4.5" },
+  { id: "us.anthropic.claude-haiku-4-5-20251001-v1:0", label: "Bedrock Haiku 4.5" },
+];
+
+function isBedrockEnv(): boolean {
+  return (
+    process.env.CLAUDE_CODE_USE_BEDROCK === "1" ||
+    process.env.CLAUDE_CODE_USE_BEDROCK === "true" ||
+    (typeof process.env.ANTHROPIC_BEDROCK_BASE_URL === "string" &&
+      process.env.ANTHROPIC_BEDROCK_BASE_URL.trim().length > 0)
+  );
+}
+
+/**
+ * Return the model list appropriate for the current auth mode.
+ * When Bedrock env vars are detected, returns Bedrock-native model IDs;
+ * otherwise returns standard Anthropic API model IDs.
+ */
+export async function listClaudeModels(): Promise<AdapterModel[]> {
+  return isBedrockEnv() ? BEDROCK_MODELS : DIRECT_MODELS;
+}
+
+/** Check whether a model ID is a Bedrock-native identifier (not an Anthropic API short name). */
+export function isBedrockModelId(model: string): boolean {
+  return model.startsWith("us.anthropic.") || model.startsWith("arn:aws:bedrock:");
+}

packages/adapters/claude-local/src/server/test.ts

@@ -16,6 +16,7 @@ import {
 } from "@paperclipai/adapter-utils/server-utils";
 import path from "node:path";
 import { detectClaudeLoginRequired, parseClaudeStreamJson } from "./parse.js";
+import { isBedrockModelId } from "./models.js";
 
 function summarizeStatus(checks: AdapterEnvironmentCheck[]): AdapterEnvironmentTestResult["status"] {
   if (checks.some((check) => check.level === "error")) return "fail";
@@ -163,10 +164,10 @@ export async function testEnvironment(
       const args = ["--print", "-", "--output-format", "stream-json", "--verbose"];
       if (dangerouslySkipPermissions) args.push("--dangerously-skip-permissions");
       if (chrome) args.push("--chrome");
-      // Skip --model for Bedrock: Anthropic-style model IDs (e.g. "claude-opus-4-6") are not
-      // valid Bedrock model identifiers.  Let the CLI use whatever model is configured in its
-      // own settings when Bedrock auth is active.
-      if (model && !hasBedrock) args.push("--model", model);
+      // For Bedrock: only pass --model when the ID is a Bedrock-native identifier.
+      if (model && (!hasBedrock || isBedrockModelId(model))) {
+        args.push("--model", model);
+      }
       if (effort) args.push("--effort", effort);
       if (maxTurns > 0) args.push("--max-turns", String(maxTurns));
       if (extraArgs.length > 0) args.push(...extraArgs);