refactor: simplify error capture to show clean error messages only

- Remove complex shell script that captured full output logs
- Use core.setOutput in prepare.ts to pass clean error message directly
- Avoid exposing potentially sensitive information from logs
- Show only the actual error message (e.g. 'Failed to fetch issue data')

This provides cleaner, more readable error messages without the risk
of exposing sensitive information from debug logs.

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

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

action.yml

@@ -81,26 +81,7 @@ runs:
       id: prepare
       shell: bash
       run: |
-        set +e
-        # Create a temporary file to capture both stdout and stderr
-        TEMP_OUTPUT=$(mktemp)
-        bun run ${{ github.action_path }}/src/entrypoints/prepare.ts 2>&1 | tee "$TEMP_OUTPUT"
-        PREPARE_EXIT_CODE=${PIPESTATUS[0]}
-
-        # If the command failed, save the error output
-        if [ $PREPARE_EXIT_CODE -ne 0 ]; then
-          # Extract last 50 lines of output as error details
-          ERROR_DETAILS=$(tail -n 50 "$TEMP_OUTPUT")
-          echo "prepare_error<<EOF" >> $GITHUB_OUTPUT
-          echo "$ERROR_DETAILS" >> $GITHUB_OUTPUT
-          echo "EOF" >> $GITHUB_OUTPUT
-        fi
-
-        # Clean up temp file
-        rm -f "$TEMP_OUTPUT"
-
-        # Exit with the original exit code
-        exit $PREPARE_EXIT_CODE
+        bun run ${{ github.action_path }}/src/entrypoints/prepare.ts
       env:
         TRIGGER_PHRASE: ${{ inputs.trigger_phrase }}
         ASSIGNEE_TRIGGER: ${{ inputs.assignee_trigger }}

src/entrypoints/prepare.ts

@@ -92,7 +92,10 @@ async function run() {
     );
     core.setOutput("mcp_config", mcpConfig);
   } catch (error) {
-    core.setFailed(`Prepare step failed with error: ${error}`);
+    const errorMessage = error instanceof Error ? error.message : String(error);
+    core.setFailed(`Prepare step failed with error: ${errorMessage}`);
+    // Also output the clean error message for the action to capture
+    core.setOutput("prepare_error", errorMessage);
     process.exit(1);
   }
 }

test/comment-logic.test.ts

@@ -45,8 +45,7 @@ describe("updateCommentBody", () => {
         currentBody: "Claude Code is working...",
         actionFailed: true,
         executionDetails: { duration_ms: 45000 },
-        errorDetails:
-          "fatal: not a git repository (or any of the parent directories): .git",
+        errorDetails: "Failed to fetch issue data",
       };
 
       const result = updateCommentBody(input);
@@ -54,7 +53,7 @@ describe("updateCommentBody", () => {
       expect(result).toContain("[View job]");
       expect(result).toContain("<details>");
       expect(result).toContain("<summary>Error details</summary>");
-      expect(result).toContain("fatal: not a git repository");
+      expect(result).toContain("Failed to fetch issue data");
       // Ensure error details come after the header/links
       const errorIndex = result.indexOf("<details>");
       const headerIndex = result.indexOf("**Claude encountered an error");