diff --git a/src/create-prompt/index.ts b/src/create-prompt/index.ts
index af17d0e..49874b3 100644
--- a/src/create-prompt/index.ts
+++ b/src/create-prompt/index.ts
@@ -157,7 +157,6 @@ export function prepareContext(
       disallowedTools: disallowedTools.join(","),
     }),
     ...(prompt && { prompt }),
-    ...(prompt && { prompt }),
     ...(claudeBranch && { claudeBranch }),
   };
 
@@ -460,12 +459,12 @@ function getCommitInstructions(
   }
 }
 
-export async function generatePrompt(
+export function generatePrompt(
   context: PreparedContext,
   githubData: FetchDataResult,
   useCommitSigning: boolean,
   mode: Mode,
-): Promise<string> {
+): string {
   // v1.0: Simply pass through the prompt to Claude Code
   // Claude Code handles slash commands natively
   const prompt = context.prompt || "";
@@ -767,8 +766,8 @@ export async function createPrompt(
       recursive: true,
     });
 
-    // Generate the prompt directly (now async due to slash commands)
-    const promptContent = await generatePrompt(
+    // Generate the prompt directly
+    const promptContent = generatePrompt(
       preparedContext,
       githubData,
       context.inputs.useCommitSigning,
diff --git a/src/modes/detector.ts b/src/modes/detector.ts
index 12a6cd2..9601b0c 100644
--- a/src/modes/detector.ts
+++ b/src/modes/detector.ts
@@ -10,6 +10,12 @@ export type AutoDetectedMode = "tag" | "agent";
 
 export function detectMode(context: GitHubContext): AutoDetectedMode {
   // If prompt is provided, always use agent mode
+  // Reasoning: When users provide explicit instructions via the prompt parameter,
+  // they want Claude to execute those instructions immediately without waiting for
+  // @claude mentions or other triggers. This aligns with the v1.0 philosophy where
+  // Claude Code handles everything - the GitHub Action is just a thin wrapper that
+  // passes through prompts directly to Claude Code for native handling (including
+  // slash commands). This provides the most direct and flexible interaction model.
   if (context.inputs?.prompt) {
     return "agent";
   }
diff --git a/src/slash-commands/loader.ts b/src/slash-commands/loader.ts
deleted file mode 100644
index a79b27e..0000000
--- a/src/slash-commands/loader.ts
+++ /dev/null
@@ -1,164 +0,0 @@
-import { readFile, readdir, stat } from "fs/promises";
-import { join, dirname } from "path";
-import { fileURLToPath } from "url";
-import * as yaml from "js-yaml";
-
-export interface SlashCommandMetadata {
-  tools?: string[];
-  settings?: Record<string, any>;
-  description?: string;
-}
-
-export interface SlashCommand {
-  name: string;
-  metadata: SlashCommandMetadata;
-  content: string;
-}
-
-export interface ResolvedCommand {
-  expandedPrompt: string;
-  tools?: string[];
-  settings?: Record<string, any>;
-}
-
-const __dirname = dirname(fileURLToPath(import.meta.url));
-const COMMANDS_DIR = join(__dirname, "../../slash-commands");
-
-export async function resolveSlashCommand(
-  prompt: string,
-  variables?: Record<string, string | undefined>,
-): Promise<ResolvedCommand> {
-  if (!prompt.startsWith("/")) {
-    return handleLegacyPrompts(prompt);
-  }
-
-  const parts = prompt.slice(1).split(" ");
-  const commandPath = parts[0];
-  const args = parts.slice(1);
-
-  if (!commandPath) {
-    return { expandedPrompt: prompt };
-  }
-
-  const commandParts = commandPath.split("/");
-
-  try {
-    const command = await loadCommand(commandParts);
-    if (!command) {
-      console.warn(`Slash command not found: ${commandPath}`);
-      return { expandedPrompt: prompt };
-    }
-
-    let expandedContent = command.content;
-
-    if (args.length > 0) {
-      expandedContent = expandedContent.replace(/\{args\}/g, args.join(" "));
-    }
-
-    if (variables) {
-      Object.entries(variables).forEach(([key, value]) => {
-        if (value !== undefined) {
-          const regex = new RegExp(`\\{${key}\\}`, "g");
-          expandedContent = expandedContent.replace(regex, value);
-        }
-      });
-    }
-
-    return {
-      expandedPrompt: expandedContent,
-      tools: command.metadata.tools,
-      settings: command.metadata.settings,
-    };
-  } catch (error) {
-    console.error(`Error loading slash command: ${error}`);
-    return { expandedPrompt: prompt };
-  }
-}
-
-async function loadCommand(
-  commandParts: string[],
-): Promise<SlashCommand | null> {
-  const possiblePaths = [
-    join(COMMANDS_DIR, ...commandParts) + ".md",
-    join(COMMANDS_DIR, ...commandParts, "default.md"),
-    join(COMMANDS_DIR, commandParts[0] + ".md"),
-  ];
-
-  for (const filePath of possiblePaths) {
-    try {
-      const fileContent = await readFile(filePath, "utf-8");
-      return parseCommandFile(commandParts.join("/"), fileContent);
-    } catch (error) {
-      continue;
-    }
-  }
-
-  return null;
-}
-
-function parseCommandFile(name: string, content: string): SlashCommand {
-  let metadata: SlashCommandMetadata = {};
-  let commandContent = content;
-
-  const frontmatterMatch = content.match(/^---\n([\s\S]*?)\n---\n([\s\S]*)$/);
-  if (frontmatterMatch && frontmatterMatch[1]) {
-    try {
-      const parsedYaml = yaml.load(frontmatterMatch[1]);
-      if (parsedYaml && typeof parsedYaml === "object") {
-        metadata = parsedYaml as SlashCommandMetadata;
-      }
-      commandContent = frontmatterMatch[2]?.trim() || content;
-    } catch (error) {
-      console.warn(`Failed to parse frontmatter for command ${name}:`, error);
-    }
-  }
-
-  return {
-    name,
-    metadata,
-    content: commandContent,
-  };
-}
-
-export async function listAvailableCommands(): Promise<string[]> {
-  const commands: string[] = [];
-
-  async function scanDirectory(dir: string, prefix = ""): Promise<void> {
-    try {
-      const entries = await readdir(dir);
-
-      for (const entry of entries) {
-        const fullPath = join(dir, entry);
-        const entryStat = await stat(fullPath);
-
-        if (entryStat.isDirectory()) {
-          await scanDirectory(fullPath, prefix ? `${prefix}/${entry}` : entry);
-        } else if (entry.endsWith(".md")) {
-          const commandName = entry.replace(".md", "");
-          if (commandName !== "default") {
-            commands.push(prefix ? `${prefix}/${commandName}` : commandName);
-          } else if (prefix) {
-            commands.push(prefix);
-          }
-        }
-      }
-    } catch (error) {
-      console.error(`Error scanning directory ${dir}:`, error);
-    }
-  }
-
-  await scanDirectory(COMMANDS_DIR);
-  return commands.sort();
-}
-
-function handleLegacyPrompts(prompt: string): ResolvedCommand {
-  const legacyKeys = ["override_prompt", "direct_prompt"];
-  for (const key of legacyKeys) {
-    const envValue = process.env[key.toUpperCase()];
-    if (envValue) {
-      console.log(`Using legacy ${key} as prompt`);
-      return { expandedPrompt: envValue };
-    }
-  }
-  return { expandedPrompt: prompt };
-}