diff --git a/container/agent-runner/src/config.ts b/container/agent-runner/src/config.ts
index 3a022ab..1546011 100644
--- a/container/agent-runner/src/config.ts
+++ b/container/agent-runner/src/config.ts
@@ -16,6 +16,8 @@ export interface RunnerConfig {
   agentGroupId: string;
   maxMessagesPerPrompt: number;
   mcpServers: Record<string, { command: string; args: string[]; env: Record<string, string> }>;
+  model?: string;
+  effort?: string;
 }
 
 const DEFAULT_MAX_MESSAGES = 10;
@@ -43,6 +45,8 @@ export function loadConfig(): RunnerConfig {
     agentGroupId: (raw.agentGroupId as string) || '',
     maxMessagesPerPrompt: (raw.maxMessagesPerPrompt as number) || DEFAULT_MAX_MESSAGES,
     mcpServers: (raw.mcpServers as RunnerConfig['mcpServers']) || {},
+    model: (raw.model as string) || undefined,
+    effort: (raw.effort as string) || undefined,
   };
 
   return _config;
diff --git a/container/agent-runner/src/index.ts b/container/agent-runner/src/index.ts
index 90c690f..d579592 100644
--- a/container/agent-runner/src/index.ts
+++ b/container/agent-runner/src/index.ts
@@ -91,6 +91,8 @@ async function main(): Promise<void> {
     mcpServers,
     env: { ...process.env },
     additionalDirectories: additionalDirectories.length > 0 ? additionalDirectories : undefined,
+    model: config.model,
+    effort: config.effort,
   });
 
   await runPollLoop({
diff --git a/container/agent-runner/src/providers/claude.ts b/container/agent-runner/src/providers/claude.ts
index 6850e51..d8e78dd 100644
--- a/container/agent-runner/src/providers/claude.ts
+++ b/container/agent-runner/src/providers/claude.ts
@@ -257,11 +257,15 @@ export class ClaudeProvider implements AgentProvider {
   private mcpServers: Record<string, McpServerConfig>;
   private env: Record<string, string | undefined>;
   private additionalDirectories?: string[];
+  private model?: string;
+  private effort?: string;
 
   constructor(options: ProviderOptions = {}) {
     this.assistantName = options.assistantName;
     this.mcpServers = options.mcpServers ?? {};
     this.additionalDirectories = options.additionalDirectories;
+    this.model = options.model;
+    this.effort = options.effort;
     this.env = {
       ...(options.env ?? {}),
       CLAUDE_CODE_AUTO_COMPACT_WINDOW,
@@ -293,6 +297,9 @@ export class ClaudeProvider implements AgentProvider {
         ],
         disallowedTools: SDK_DISALLOWED_TOOLS,
         env: this.env,
+        model: this.model,
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        effort: this.effort as any,
         permissionMode: 'bypassPermissions',
         allowDangerouslySkipPermissions: true,
         settingSources: ['project', 'user'],
diff --git a/container/agent-runner/src/providers/types.ts b/container/agent-runner/src/providers/types.ts
index b4b1fc8..c679dbe 100644
--- a/container/agent-runner/src/providers/types.ts
+++ b/container/agent-runner/src/providers/types.ts
@@ -25,6 +25,16 @@ export interface ProviderOptions {
   mcpServers?: Record<string, McpServerConfig>;
   env?: Record<string, string | undefined>;
   additionalDirectories?: string[];
+  /**
+   * Model alias (`sonnet`, `opus`, `haiku`) or full model ID. Passed through
+   * to the underlying SDK. If omitted, the SDK default is used.
+   */
+  model?: string;
+  /**
+   * Reasoning effort (`'low' | 'medium' | 'high' | 'xhigh' | 'max'`). Passed
+   * through to the underlying SDK. If omitted, the SDK default is used.
+   */
+  effort?: string;
 }
 
 export interface QueryInput {