feat: support single file input (input_file) alongside directory mode

README.md

@@ -5,19 +5,35 @@ Python MCP Server for PDF OCR batch processing.
 ## Features
 
 - **Batch OCR** - Process multiple PDF files and save results as Markdown
+- **Single File OCR** - Process a single PDF file directly
 
 ## Tool
 
 ### `batch_ocr_pdf`
 
-Batch process all PDF files in a directory using the OCR API.
+OCR process PDF file(s) using the OCR API. Supports both single file and directory modes.
 
 **Parameters:**
-- `input_dir`: Directory containing PDF files
-- `output_dir`: Directory to save Markdown results
+- `input_file`: Path to a single PDF file to process (mutually exclusive with `input_dir`)
+- `input_dir`: Directory containing PDF files to process (mutually exclusive with `input_file`)
+- `output_dir`: Directory to save Markdown results (auto-created if not provided)
 - `api_key`: OCR API key (optional, reads from `OCR_API_KEY` env var)
 - `base_url`: OCR API base URL (default: `https://agent.imqimacau.com`)
 
+**Usage Modes:**
+
+1. **Single File Mode**: Provide `input_file` only
+   ```
+   input_file: /path/to/document.pdf
+   ```
+
+2. **Batch Mode**: Provide `input_dir` only
+   ```
+   input_dir: /path/to/pdf_directory
+   ```
+
+**Note:** `input_file` and `input_dir` are mutually exclusive. At least one must be provided.
+
 **Returns:** JSON with processing results (success/fail counts per file)
 
 ## Setup