feat: merge prepare and run steps into unified entry point

Consolidates the two-step architecture (prepare → run) into a single
step to eliminate file-based and output-based communication.

Changes:
- Add base-action/src/lib.ts with exports for main action import
- Modify run-claude-sdk.ts to accept prompt string directly and return result
- Add generatePromptContent() that returns prompt without file I/O
- Update mode prepare() to return promptContent in result
- Create src/entrypoints/run.ts as unified entry point
- Update action.yml to use single Run Claude Code step
- Update output references from steps.prepare to steps.claude-code

Benefits:
- No file I/O for prompt - data stays in memory
- No step output parsing - direct function returns
- Simpler debugging - single entry point
- Faster execution - no subprocess overhead
- Type safety - TypeScript across the boundary

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

action.yml

@@ -120,10 +120,10 @@ outputs:
     value: ${{ steps.claude-code.outputs.execution_file }}
   branch_name:
     description: "The branch created by Claude Code for this execution"
-    value: ${{ steps.prepare.outputs.CLAUDE_BRANCH }}
+    value: ${{ steps.claude-code.outputs.CLAUDE_BRANCH }}
   github_token:
     description: "The GitHub token used by the action (Claude App token if available)"
-    value: ${{ steps.prepare.outputs.github_token }}
+    value: ${{ steps.claude-code.outputs.GITHUB_TOKEN }}
   structured_output:
     description: "JSON string containing all structured output fields when --json-schema is provided in claude_args. Use fromJSON() to parse: fromJSON(steps.id.outputs.structured_output).field_name"
     value: ${{ steps.claude-code.outputs.structured_output }}
@@ -152,44 +152,15 @@ runs:
         echo "$BUN_DIR" >> "$GITHUB_PATH"
 
     - name: Install Dependencies
-      shell: bash
-      run: |
-        cd ${GITHUB_ACTION_PATH}
-        bun install
-
-    - name: Prepare action
-      id: prepare
-      shell: bash
-      run: |
-        bun run ${GITHUB_ACTION_PATH}/src/entrypoints/prepare.ts
-      env:
-        MODE: ${{ inputs.mode }}
-        PROMPT: ${{ inputs.prompt }}
-        TRIGGER_PHRASE: ${{ inputs.trigger_phrase }}
-        ASSIGNEE_TRIGGER: ${{ inputs.assignee_trigger }}
-        LABEL_TRIGGER: ${{ inputs.label_trigger }}
-        BASE_BRANCH: ${{ inputs.base_branch }}
-        BRANCH_PREFIX: ${{ inputs.branch_prefix }}
-        OVERRIDE_GITHUB_TOKEN: ${{ inputs.github_token }}
-        ALLOWED_BOTS: ${{ inputs.allowed_bots }}
-        ALLOWED_NON_WRITE_USERS: ${{ inputs.allowed_non_write_users }}
-        GITHUB_RUN_ID: ${{ github.run_id }}
-        USE_STICKY_COMMENT: ${{ inputs.use_sticky_comment }}
-        DEFAULT_WORKFLOW_TOKEN: ${{ github.token }}
-        USE_COMMIT_SIGNING: ${{ inputs.use_commit_signing }}
-        BOT_ID: ${{ inputs.bot_id }}
-        BOT_NAME: ${{ inputs.bot_name }}
-        TRACK_PROGRESS: ${{ inputs.track_progress }}
-        ADDITIONAL_PERMISSIONS: ${{ inputs.additional_permissions }}
-        CLAUDE_ARGS: ${{ inputs.claude_args }}
-        ALL_INPUTS: ${{ toJson(inputs) }}
-
-    - name: Install Base Action Dependencies
-      if: steps.prepare.outputs.contains_trigger == 'true'
       shell: bash
       env:
         PATH_TO_CLAUDE_CODE_EXECUTABLE: ${{ inputs.path_to_claude_code_executable }}
       run: |
+        # Install main action dependencies
+        cd ${GITHUB_ACTION_PATH}
+        bun install
+
+        # Install base-action dependencies
         echo "Installing base-action dependencies..."
         cd ${GITHUB_ACTION_PATH}/base-action
         bun install
@@ -223,31 +194,46 @@ runs:
           echo "$CLAUDE_DIR" >> "$GITHUB_PATH"
         fi
 
+    # Unified step: prepare + setup + run Claude
     - name: Run Claude Code
       id: claude-code
-      if: steps.prepare.outputs.contains_trigger == 'true'
       shell: bash
       run: |
-
-        # Run the base-action
-        bun run ${GITHUB_ACTION_PATH}/base-action/src/index.ts
+        bun run ${GITHUB_ACTION_PATH}/src/entrypoints/run.ts
       env:
-        # Base-action inputs
+        # Action configuration
         CLAUDE_CODE_ACTION: "1"
-        INPUT_PROMPT_FILE: ${{ runner.temp }}/claude-prompts/claude-prompt.txt
+        MODE: ${{ inputs.mode }}
+        PROMPT: ${{ inputs.prompt }}
+        TRIGGER_PHRASE: ${{ inputs.trigger_phrase }}
+        ASSIGNEE_TRIGGER: ${{ inputs.assignee_trigger }}
+        LABEL_TRIGGER: ${{ inputs.label_trigger }}
+        BASE_BRANCH: ${{ inputs.base_branch }}
+        BRANCH_PREFIX: ${{ inputs.branch_prefix }}
+        OVERRIDE_GITHUB_TOKEN: ${{ inputs.github_token }}
+        ALLOWED_BOTS: ${{ inputs.allowed_bots }}
+        ALLOWED_NON_WRITE_USERS: ${{ inputs.allowed_non_write_users }}
+        GITHUB_RUN_ID: ${{ github.run_id }}
+        USE_STICKY_COMMENT: ${{ inputs.use_sticky_comment }}
+        DEFAULT_WORKFLOW_TOKEN: ${{ github.token }}
+        USE_COMMIT_SIGNING: ${{ inputs.use_commit_signing }}
+        BOT_ID: ${{ inputs.bot_id }}
+        BOT_NAME: ${{ inputs.bot_name }}
+        TRACK_PROGRESS: ${{ inputs.track_progress }}
+        ADDITIONAL_PERMISSIONS: ${{ inputs.additional_permissions }}
+        CLAUDE_ARGS: ${{ inputs.claude_args }}
+        ALL_INPUTS: ${{ toJson(inputs) }}
+
+        # Base-action inputs
         INPUT_SETTINGS: ${{ inputs.settings }}
-        INPUT_CLAUDE_ARGS: ${{ steps.prepare.outputs.claude_args }}
+        INPUT_CLAUDE_ARGS: ${{ inputs.claude_args }}
         INPUT_EXPERIMENTAL_SLASH_COMMANDS_DIR: ${{ github.action_path }}/slash-commands
-        INPUT_ACTION_INPUTS_PRESENT: ${{ steps.prepare.outputs.action_inputs_present }}
         INPUT_PATH_TO_CLAUDE_CODE_EXECUTABLE: ${{ inputs.path_to_claude_code_executable }}
         INPUT_PATH_TO_BUN_EXECUTABLE: ${{ inputs.path_to_bun_executable }}
         INPUT_SHOW_FULL_OUTPUT: ${{ inputs.show_full_output }}
         INPUT_PLUGINS: ${{ inputs.plugins }}
         INPUT_PLUGIN_MARKETPLACES: ${{ inputs.plugin_marketplaces }}
 
-        # Model configuration
-        GITHUB_TOKEN: ${{ steps.prepare.outputs.GITHUB_TOKEN }}
-        GH_TOKEN: ${{ steps.prepare.outputs.GITHUB_TOKEN }}
         NODE_VERSION: ${{ env.NODE_VERSION }}
         DETAILED_PERMISSION_MESSAGES: "1"
 
@@ -287,33 +273,33 @@ runs:
         ANTHROPIC_DEFAULT_OPUS_MODEL: ${{ env.ANTHROPIC_DEFAULT_OPUS_MODEL }}
 
     - name: Update comment with job link
-      if: steps.prepare.outputs.contains_trigger == 'true' && steps.prepare.outputs.claude_comment_id && always()
+      if: steps.claude-code.outputs.contains_trigger == 'true' && steps.claude-code.outputs.claude_comment_id && always()
       shell: bash
       run: |
         bun run ${GITHUB_ACTION_PATH}/src/entrypoints/update-comment-link.ts
       env:
         REPOSITORY: ${{ github.repository }}
         PR_NUMBER: ${{ github.event.issue.number || github.event.pull_request.number }}
-        CLAUDE_COMMENT_ID: ${{ steps.prepare.outputs.claude_comment_id }}
+        CLAUDE_COMMENT_ID: ${{ steps.claude-code.outputs.claude_comment_id }}
         GITHUB_RUN_ID: ${{ github.run_id }}
-        GITHUB_TOKEN: ${{ steps.prepare.outputs.GITHUB_TOKEN }}
-        GH_TOKEN: ${{ steps.prepare.outputs.GITHUB_TOKEN }}
+        GITHUB_TOKEN: ${{ steps.claude-code.outputs.GITHUB_TOKEN }}
+        GH_TOKEN: ${{ steps.claude-code.outputs.GITHUB_TOKEN }}
         GITHUB_EVENT_NAME: ${{ github.event_name }}
         TRIGGER_COMMENT_ID: ${{ github.event.comment.id }}
-        CLAUDE_BRANCH: ${{ steps.prepare.outputs.CLAUDE_BRANCH }}
+        CLAUDE_BRANCH: ${{ steps.claude-code.outputs.CLAUDE_BRANCH }}
         IS_PR: ${{ github.event.issue.pull_request != null || github.event_name == 'pull_request_target' || github.event_name == 'pull_request_review_comment' }}
-        BASE_BRANCH: ${{ steps.prepare.outputs.BASE_BRANCH }}
+        BASE_BRANCH: ${{ steps.claude-code.outputs.BASE_BRANCH }}
         CLAUDE_SUCCESS: ${{ steps.claude-code.outputs.conclusion == 'success' }}
         OUTPUT_FILE: ${{ steps.claude-code.outputs.execution_file || '' }}
         TRIGGER_USERNAME: ${{ github.event.comment.user.login || github.event.issue.user.login || github.event.pull_request.user.login || github.event.sender.login || github.triggering_actor || github.actor || '' }}
-        PREPARE_SUCCESS: ${{ steps.prepare.outcome == 'success' }}
-        PREPARE_ERROR: ${{ steps.prepare.outputs.prepare_error || '' }}
+        PREPARE_SUCCESS: ${{ steps.claude-code.outcome == 'success' }}
+        PREPARE_ERROR: ${{ steps.claude-code.outputs.prepare_error || '' }}
         USE_STICKY_COMMENT: ${{ inputs.use_sticky_comment }}
         USE_COMMIT_SIGNING: ${{ inputs.use_commit_signing }}
         TRACK_PROGRESS: ${{ inputs.track_progress }}
 
     - name: Display Claude Code Report
-      if: steps.prepare.outputs.contains_trigger == 'true' && steps.claude-code.outputs.execution_file != ''
+      if: steps.claude-code.outputs.contains_trigger == 'true' && steps.claude-code.outputs.execution_file != ''
       shell: bash
       run: |
         # Try to format the turns, but if it fails, dump the raw JSON
@@ -330,12 +316,12 @@ runs:
         fi
 
     - name: Revoke app token
-      if: always() && inputs.github_token == '' && steps.prepare.outputs.skipped_due_to_workflow_validation_mismatch != 'true'
+      if: always() && inputs.github_token == '' && steps.claude-code.outputs.skipped_due_to_workflow_validation_mismatch != 'true'
       shell: bash
       run: |
         curl -L \
           -X DELETE \
           -H "Accept: application/vnd.github+json" \
-          -H "Authorization: Bearer ${{ steps.prepare.outputs.GITHUB_TOKEN }}" \
+          -H "Authorization: Bearer ${{ steps.claude-code.outputs.GITHUB_TOKEN }}" \
           -H "X-GitHub-Api-Version: 2022-11-28" \
           ${GITHUB_API_URL:-https://api.github.com}/installation/token

base-action/src/lib.ts

@@ -0,0 +1,13 @@
+/**
+ * Library exports for the base-action.
+ * These functions can be imported directly by the main action
+ * to avoid file/output-based communication between steps.
+ */
+
+export { runClaudeWithSdk, runClaudeWithSdkFromFile } from "./run-claude-sdk";
+export type { RunClaudeResult, PromptInput } from "./run-claude-sdk";
+export { setupClaudeCodeSettings } from "./setup-claude-code-settings";
+export { installPlugins } from "./install-plugins";
+export { parseSdkOptions } from "./parse-sdk-options";
+export type { ClaudeOptions } from "./run-claude";
+export type { ParsedSdkOptions } from "./parse-sdk-options";

base-action/src/run-claude-sdk.ts

@@ -9,6 +9,18 @@ import type { ParsedSdkOptions } from "./parse-sdk-options";
 
 const EXECUTION_FILE = `${process.env.RUNNER_TEMP}/claude-execution-output.json`;
 
+/**
+ * Result of running Claude via SDK
+ */
+export type RunClaudeResult = {
+  success: boolean;
+  executionFile: string;
+  conclusion: "success" | "failure";
+  structuredOutput?: string;
+  sessionId?: string;
+  error?: string;
+};
+
 /**
  * Sanitizes SDK output to match CLI sanitization behavior
  */
@@ -57,13 +69,31 @@ function sanitizeSdkOutput(
 }
 
 /**
- * Run Claude using the Agent SDK
+ * Input for runClaudeWithSdk - either a prompt string or file path
+ */
+export type PromptInput =
+  | { type: "string"; prompt: string }
+  | { type: "file"; promptPath: string };
+
+/**
+ * Run Claude using the Agent SDK.
+ *
+ * @param promptInput - Either a direct prompt string or path to prompt file
+ * @param parsedOptions - Parsed SDK options
+ * @param options - Additional options
+ * @param options.setOutputs - Whether to set GitHub Action outputs (default: true for backwards compat)
+ * @returns Result of the execution
  */
 export async function runClaudeWithSdk(
-  promptPath: string,
+  promptInput: PromptInput,
   { sdkOptions, showFullOutput, hasJsonSchema }: ParsedSdkOptions,
-): Promise<void> {
-  const prompt = await readFile(promptPath, "utf-8");
+  { setOutputs = true }: { setOutputs?: boolean } = {},
+): Promise<RunClaudeResult> {
+  // Get prompt from string or file
+  const prompt =
+    promptInput.type === "string"
+      ? promptInput.prompt
+      : await readFile(promptInput.promptPath, "utf-8");
 
   if (!showFullOutput) {
     console.log(
@@ -74,7 +104,13 @@ export async function runClaudeWithSdk(
     );
   }
 
-  console.log(`Running Claude with prompt from file: ${promptPath}`);
+  if (promptInput.type === "file") {
+    console.log(
+      `Running Claude with prompt from file: ${promptInput.promptPath}`,
+    );
+  } else {
+    console.log(`Running Claude with prompt string (${prompt.length} chars)`);
+  }
   // Log SDK options without env (which could contain sensitive data)
   const { env, ...optionsToLog } = sdkOptions;
   console.log("SDK options:", JSON.stringify(optionsToLog, null, 2));
@@ -97,27 +133,47 @@ export async function runClaudeWithSdk(
     }
   } catch (error) {
     console.error("SDK execution error:", error);
-    core.setOutput("conclusion", "failure");
-    process.exit(1);
+    if (setOutputs) {
+      core.setOutput("conclusion", "failure");
+    }
+    return {
+      success: false,
+      executionFile: EXECUTION_FILE,
+      conclusion: "failure",
+      error: String(error),
+    };
   }
 
   // Write execution file
   try {
     await writeFile(EXECUTION_FILE, JSON.stringify(messages, null, 2));
     console.log(`Log saved to ${EXECUTION_FILE}`);
-    core.setOutput("execution_file", EXECUTION_FILE);
+    if (setOutputs) {
+      core.setOutput("execution_file", EXECUTION_FILE);
+    }
   } catch (error) {
     core.warning(`Failed to write execution file: ${error}`);
   }
 
   if (!resultMessage) {
-    core.setOutput("conclusion", "failure");
+    if (setOutputs) {
+      core.setOutput("conclusion", "failure");
+    }
     core.error("No result message received from Claude");
-    process.exit(1);
+    return {
+      success: false,
+      executionFile: EXECUTION_FILE,
+      conclusion: "failure",
+      error: "No result message received from Claude",
+    };
   }
 
   const isSuccess = resultMessage.subtype === "success";
-  core.setOutput("conclusion", isSuccess ? "success" : "failure");
+  if (setOutputs) {
+    core.setOutput("conclusion", isSuccess ? "success" : "failure");
+  }
+
+  let structuredOutput: string | undefined;
 
   // Handle structured output
   if (hasJsonSchema) {
@@ -126,26 +182,64 @@ export async function runClaudeWithSdk(
       "structured_output" in resultMessage &&
       resultMessage.structured_output
     ) {
-      const structuredOutputJson = JSON.stringify(
-        resultMessage.structured_output,
-      );
-      core.setOutput("structured_output", structuredOutputJson);
+      structuredOutput = JSON.stringify(resultMessage.structured_output);
+      if (setOutputs) {
+        core.setOutput("structured_output", structuredOutput);
+      }
       core.info(
         `Set structured_output with ${Object.keys(resultMessage.structured_output as object).length} field(s)`,
       );
     } else {
-      core.setFailed(
-        `--json-schema was provided but Claude did not return structured_output. Result subtype: ${resultMessage.subtype}`,
-      );
-      core.setOutput("conclusion", "failure");
-      process.exit(1);
+      const errorMsg = `--json-schema was provided but Claude did not return structured_output. Result subtype: ${resultMessage.subtype}`;
+      if (setOutputs) {
+        core.setFailed(errorMsg);
+        core.setOutput("conclusion", "failure");
+      }
+      return {
+        success: false,
+        executionFile: EXECUTION_FILE,
+        conclusion: "failure",
+        error: errorMsg,
+      };
     }
   }
 
   if (!isSuccess) {
-    if ("errors" in resultMessage && resultMessage.errors) {
-      core.error(`Execution failed: ${resultMessage.errors.join(", ")}`);
-    }
+    const errors =
+      "errors" in resultMessage && resultMessage.errors
+        ? resultMessage.errors.join(", ")
+        : "Unknown error";
+    core.error(`Execution failed: ${errors}`);
+    return {
+      success: false,
+      executionFile: EXECUTION_FILE,
+      conclusion: "failure",
+      error: errors,
+    };
+  }
+
+  return {
+    success: true,
+    executionFile: EXECUTION_FILE,
+    conclusion: "success",
+    structuredOutput,
+  };
+}
+
+/**
+ * Wrapper for backwards compatibility - reads prompt from file path and exits on failure
+ */
+export async function runClaudeWithSdkFromFile(
+  promptPath: string,
+  parsedOptions: ParsedSdkOptions,
+): Promise<void> {
+  const result = await runClaudeWithSdk(
+    { type: "file", promptPath },
+    parsedOptions,
+    { setOutputs: true },
+  );
+
+  if (!result.success) {
     process.exit(1);
   }
 }

base-action/src/run-claude.ts

@@ -5,7 +5,7 @@ import { unlink, writeFile, stat, readFile } from "fs/promises";
 import { createWriteStream } from "fs";
 import { spawn } from "child_process";
 import { parse as parseShellArgs } from "shell-quote";
-import { runClaudeWithSdk } from "./run-claude-sdk";
+import { runClaudeWithSdkFromFile } from "./run-claude-sdk";
 import { parseSdkOptions } from "./parse-sdk-options";
 
 const execAsync = promisify(exec);
@@ -205,7 +205,7 @@ export async function runClaude(promptPath: string, options: ClaudeOptions) {
 
   if (useAgentSdk) {
     const parsedOptions = parseSdkOptions(options);
-    return runClaudeWithSdk(promptPath, parsedOptions);
+    return runClaudeWithSdkFromFile(promptPath, parsedOptions);
   }
 
   const config = prepareRunConfig(promptPath, options);

src/create-prompt/index.ts

@@ -841,6 +841,78 @@ f. If you are unable to complete certain steps, such as running a linter or test
   return promptContent;
 }
 
+/**
+ * Result of generating prompt content
+ */
+export type PromptResult = {
+  promptContent: string;
+  allowedTools: string;
+  disallowedTools: string;
+};
+
+/**
+ * Generate prompt content and tool configurations.
+ * This function can be used directly without side effects (no file writes, no env vars).
+ */
+export function generatePromptContent(
+  mode: Mode,
+  modeContext: ModeContext,
+  githubData: FetchDataResult,
+  context: ParsedGitHubContext,
+): PromptResult {
+  // Prepare the context for prompt generation
+  let claudeCommentId: string = "";
+  if (mode.name === "tag") {
+    if (!modeContext.commentId) {
+      throw new Error(
+        `${mode.name} mode requires a comment ID for prompt generation`,
+      );
+    }
+    claudeCommentId = modeContext.commentId.toString();
+  }
+
+  const preparedContext = prepareContext(
+    context,
+    claudeCommentId,
+    modeContext.baseBranch,
+    modeContext.claudeBranch,
+  );
+
+  // Generate the prompt directly
+  const promptContent = generatePrompt(
+    preparedContext,
+    githubData,
+    context.inputs.useCommitSigning,
+    mode,
+  );
+
+  // Get mode-specific tools
+  const modeAllowedTools = mode.getAllowedTools();
+  const modeDisallowedTools = mode.getDisallowedTools();
+
+  const hasActionsReadPermission = false;
+  const allowedTools = buildAllowedToolsString(
+    modeAllowedTools,
+    hasActionsReadPermission,
+    context.inputs.useCommitSigning,
+  );
+  const disallowedTools = buildDisallowedToolsString(
+    modeDisallowedTools,
+    modeAllowedTools,
+  );
+
+  return {
+    promptContent,
+    allowedTools,
+    disallowedTools,
+  };
+}
+
+/**
+ * Create prompt and write to file.
+ * This is the legacy function that writes files and sets environment variables.
+ * For the unified step, use generatePromptContent() instead.
+ */
 export async function createPrompt(
   mode: Mode,
   modeContext: ModeContext,
@@ -848,66 +920,30 @@ export async function createPrompt(
   context: ParsedGitHubContext,
 ) {
   try {
-    // Prepare the context for prompt generation
-    let claudeCommentId: string = "";
-    if (mode.name === "tag") {
-      if (!modeContext.commentId) {
-        throw new Error(
-          `${mode.name} mode requires a comment ID for prompt generation`,
-        );
-      }
-      claudeCommentId = modeContext.commentId.toString();
-    }
-
-    const preparedContext = prepareContext(
-      context,
-      claudeCommentId,
-      modeContext.baseBranch,
-      modeContext.claudeBranch,
-    );
-
-    await mkdir(`${process.env.RUNNER_TEMP || "/tmp"}/claude-prompts`, {
-      recursive: true,
-    });
-
-    // Generate the prompt directly
-    const promptContent = generatePrompt(
-      preparedContext,
-      githubData,
-      context.inputs.useCommitSigning,
+    const result = generatePromptContent(
       mode,
+      modeContext,
+      githubData,
+      context,
     );
 
     // Log the final prompt to console
     console.log("===== FINAL PROMPT =====");
-    console.log(promptContent);
+    console.log(result.promptContent);
     console.log("=======================");
 
     // Write the prompt file
+    await mkdir(`${process.env.RUNNER_TEMP || "/tmp"}/claude-prompts`, {
+      recursive: true,
+    });
     await writeFile(
       `${process.env.RUNNER_TEMP || "/tmp"}/claude-prompts/claude-prompt.txt`,
-      promptContent,
+      result.promptContent,
     );
 
-    // Set allowed tools
-    const hasActionsReadPermission = false;
-
-    // Get mode-specific tools
-    const modeAllowedTools = mode.getAllowedTools();
-    const modeDisallowedTools = mode.getDisallowedTools();
-
-    const allAllowedTools = buildAllowedToolsString(
-      modeAllowedTools,
-      hasActionsReadPermission,
-      context.inputs.useCommitSigning,
-    );
-    const allDisallowedTools = buildDisallowedToolsString(
-      modeDisallowedTools,
-      modeAllowedTools,
-    );
-
-    core.exportVariable("ALLOWED_TOOLS", allAllowedTools);
-    core.exportVariable("DISALLOWED_TOOLS", allDisallowedTools);
+    // Set environment variables
+    core.exportVariable("ALLOWED_TOOLS", result.allowedTools);
+    core.exportVariable("DISALLOWED_TOOLS", result.disallowedTools);
   } catch (error) {
     core.setFailed(`Create prompt failed with error: ${error}`);
     process.exit(1);

src/entrypoints/run.ts

@@ -0,0 +1,186 @@
+#!/usr/bin/env bun
+
+/**
+ * Unified entry point for the Claude action.
+ *
+ * This combines the prepare and run phases into a single step,
+ * passing data directly in-memory instead of via files and outputs.
+ */
+
+import * as core from "@actions/core";
+import { setupGitHubToken } from "../github/token";
+import { checkWritePermissions } from "../github/validation/permissions";
+import { createOctokit } from "../github/api/client";
+import { parseGitHubContext, isEntityContext } from "../github/context";
+import { getMode } from "../modes/registry";
+import { prepare } from "../prepare";
+import { collectActionInputsPresence } from "./collect-inputs";
+import {
+  runClaudeWithSdk,
+  setupClaudeCodeSettings,
+  installPlugins,
+  parseSdkOptions,
+} from "../../base-action/src/lib";
+
+async function run() {
+  try {
+    // ============================================
+    // PHASE 1: PREPARE
+    // ============================================
+
+    collectActionInputsPresence();
+
+    // Parse GitHub context first to enable mode detection
+    const context = parseGitHubContext();
+
+    // Auto-detect mode based on context
+    const mode = getMode(context);
+
+    // Setup GitHub token
+    const githubToken = await setupGitHubToken();
+    const octokit = createOctokit(githubToken);
+
+    // Check write permissions (only for entity contexts)
+    if (isEntityContext(context)) {
+      const githubTokenProvided = !!process.env.OVERRIDE_GITHUB_TOKEN;
+      const hasWritePermissions = await checkWritePermissions(
+        octokit.rest,
+        context,
+        context.inputs.allowedNonWriteUsers,
+        githubTokenProvided,
+      );
+      if (!hasWritePermissions) {
+        throw new Error(
+          "Actor does not have write permissions to the repository",
+        );
+      }
+    }
+
+    // Check trigger conditions
+    const containsTrigger = mode.shouldTrigger(context);
+
+    // Debug logging
+    console.log(`Mode: ${mode.name}`);
+    console.log(`Context prompt: ${context.inputs?.prompt || "NO PROMPT"}`);
+    console.log(`Trigger result: ${containsTrigger}`);
+
+    // Set output for action.yml to check
+    core.setOutput("contains_trigger", containsTrigger.toString());
+
+    if (!containsTrigger) {
+      console.log("No trigger found, skipping remaining steps");
+      core.setOutput("GITHUB_TOKEN", githubToken);
+      return;
+    }
+
+    // Run mode.prepare() - returns prompt, commentId, branchInfo, etc.
+    const prepareResult = await prepare({
+      context,
+      octokit,
+      mode,
+      githubToken,
+    });
+
+    // Set outputs that may be needed by subsequent steps
+    core.setOutput("GITHUB_TOKEN", githubToken);
+    if (prepareResult.commentId) {
+      core.setOutput("claude_comment_id", prepareResult.commentId.toString());
+    }
+    core.setOutput(
+      "CLAUDE_BRANCH",
+      prepareResult.branchInfo.claudeBranch || "",
+    );
+    core.setOutput("BASE_BRANCH", prepareResult.branchInfo.baseBranch);
+
+    // Get system prompt from mode if available
+    let appendSystemPrompt: string | undefined;
+    if (mode.getSystemPrompt) {
+      const modeContext = mode.prepareContext(context, {
+        commentId: prepareResult.commentId,
+        baseBranch: prepareResult.branchInfo.baseBranch,
+        claudeBranch: prepareResult.branchInfo.claudeBranch,
+      });
+      appendSystemPrompt = mode.getSystemPrompt(modeContext);
+    }
+
+    // ============================================
+    // PHASE 2: SETUP
+    // ============================================
+
+    // Setup Claude Code settings
+    await setupClaudeCodeSettings(
+      process.env.INPUT_SETTINGS,
+      undefined, // homeDir
+    );
+
+    // Install Claude Code plugins if specified
+    await installPlugins(
+      process.env.INPUT_PLUGIN_MARKETPLACES,
+      process.env.INPUT_PLUGINS,
+      process.env.INPUT_PATH_TO_CLAUDE_CODE_EXECUTABLE,
+    );
+
+    // ============================================
+    // PHASE 3: EXECUTE
+    // ============================================
+
+    // Get prompt content from prepare result
+    const promptContent = prepareResult.promptContent;
+    if (!promptContent) {
+      throw new Error("No prompt content generated by prepare phase");
+    }
+
+    console.log("===== PROMPT CONTENT =====");
+    console.log(`Prompt length: ${promptContent.length} chars`);
+    console.log("==========================");
+
+    // Build SDK options from environment and prepare result
+    const sdkOptions = parseSdkOptions({
+      claudeArgs: process.env.INPUT_CLAUDE_ARGS,
+      allowedTools:
+        prepareResult.allowedTools || process.env.INPUT_ALLOWED_TOOLS,
+      disallowedTools:
+        prepareResult.disallowedTools || process.env.INPUT_DISALLOWED_TOOLS,
+      maxTurns: process.env.INPUT_MAX_TURNS,
+      mcpConfig: process.env.INPUT_MCP_CONFIG,
+      systemPrompt: process.env.INPUT_SYSTEM_PROMPT,
+      appendSystemPrompt:
+        appendSystemPrompt || process.env.INPUT_APPEND_SYSTEM_PROMPT,
+      claudeEnv: process.env.INPUT_CLAUDE_ENV,
+      fallbackModel: process.env.INPUT_FALLBACK_MODEL,
+      model: process.env.ANTHROPIC_MODEL,
+      pathToClaudeCodeExecutable:
+        process.env.INPUT_PATH_TO_CLAUDE_CODE_EXECUTABLE,
+      showFullOutput: process.env.INPUT_SHOW_FULL_OUTPUT,
+    });
+
+    // Run Claude with prompt string directly
+    const execResult = await runClaudeWithSdk(
+      { type: "string", prompt: promptContent },
+      sdkOptions,
+      { setOutputs: true },
+    );
+
+    // Set additional outputs
+    core.setOutput("execution_file", execResult.executionFile);
+    core.setOutput("conclusion", execResult.conclusion);
+    if (execResult.structuredOutput) {
+      core.setOutput("structured_output", execResult.structuredOutput);
+    }
+
+    if (!execResult.success) {
+      core.setFailed(`Claude execution failed: ${execResult.error}`);
+      process.exit(1);
+    }
+  } catch (error) {
+    const errorMessage = error instanceof Error ? error.message : String(error);
+    core.setFailed(`Run step failed with error: ${errorMessage}`);
+    core.setOutput("prepare_error", errorMessage);
+    core.setOutput("conclusion", "failure");
+    process.exit(1);
+  }
+}
+
+if (import.meta.main) {
+  run();
+}

src/modes/agent/index.ts

@@ -95,16 +95,15 @@ export const agentMode: Mode = {
       }
     }
 
-    // Create prompt directory
-    await mkdir(`${process.env.RUNNER_TEMP || "/tmp"}/claude-prompts`, {
-      recursive: true,
-    });
-
-    // Write the prompt file - use the user's prompt directly
+    // Generate prompt content - use the user's prompt directly
     const promptContent =
       context.inputs.prompt ||
       `Repository: ${context.repository.owner}/${context.repository.repo}`;
 
+    // Also write file for backwards compatibility with current flow
+    await mkdir(`${process.env.RUNNER_TEMP || "/tmp"}/claude-prompts`, {
+      recursive: true,
+    });
     await writeFile(
       `${process.env.RUNNER_TEMP || "/tmp"}/claude-prompts/claude-prompt.txt`,
       promptContent,
@@ -162,6 +161,8 @@ export const agentMode: Mode = {
         claudeBranch: claudeBranch,
       },
       mcpConfig: ourMcpConfig,
+      promptContent,
+      // Agent mode doesn't use the same allowed/disallowed tools mechanism as tag mode
     };
   },
 

src/modes/tag/index.ts

@@ -10,7 +10,11 @@ import {
   fetchGitHubData,
   extractTriggerTimestamp,
 } from "../../github/data/fetcher";
-import { createPrompt, generateDefaultPrompt } from "../../create-prompt";
+import {
+  createPrompt,
+  generateDefaultPrompt,
+  generatePromptContent,
+} from "../../create-prompt";
 import { isEntityContext } from "../../github/context";
 import type { PreparedContext } from "../../create-prompt/types";
 import type { FetchDataResult } from "../../github/data/fetcher";
@@ -104,13 +108,22 @@ export const tagMode: Mode = {
       }
     }
 
-    // Create prompt file
+    // Create prompt
     const modeContext = this.prepareContext(context, {
       commentId,
       baseBranch: branchInfo.baseBranch,
       claudeBranch: branchInfo.claudeBranch,
     });
 
+    // Generate prompt content - returns data instead of writing file
+    const promptResult = generatePromptContent(
+      tagMode,
+      modeContext,
+      githubData,
+      context,
+    );
+
+    // Also write file for backwards compatibility with current flow
     await createPrompt(tagMode, modeContext, githubData, context);
 
     const userClaudeArgs = process.env.CLAUDE_ARGS || "";
@@ -188,6 +201,9 @@ export const tagMode: Mode = {
       commentId,
       branchInfo,
       mcpConfig: ourMcpConfig,
+      promptContent: promptResult.promptContent,
+      allowedTools: promptResult.allowedTools,
+      disallowedTools: promptResult.disallowedTools,
     };
   },
 

src/modes/types.ts

@@ -97,4 +97,10 @@ export type ModeResult = {
     currentBranch: string;
   };
   mcpConfig: string;
+  /** Generated prompt content for Claude */
+  promptContent?: string;
+  /** Comma-separated list of allowed tools */
+  allowedTools?: string;
+  /** Comma-separated list of disallowed tools */
+  disallowedTools?: string;
 };

src/prepare/types.ts

@@ -10,6 +10,12 @@ export type PrepareResult = {
     currentBranch: string;
   };
   mcpConfig: string;
+  /** Generated prompt content for Claude */
+  promptContent?: string;
+  /** Comma-separated list of allowed tools */
+  allowedTools?: string;
+  /** Comma-separated list of disallowed tools */
+  disallowedTools?: string;
 };
 
 export type PrepareOptions = {

test/modes/agent.test.ts

@@ -177,6 +177,7 @@ describe("Agent Mode", () => {
         claudeBranch: undefined,
       },
       mcpConfig: expect.any(String),
+      promptContent: expect.any(String),
     });
 
     // Clean up