updated readme

src/filesystem/README.md

@@ -36,6 +36,35 @@ Node.js server implementing Model Context Protocol (MCP) for filesystem operatio
     - `path` (string): File location
     - `content` (string): File content
 
+- **edit_file**
+  - Make selective edits to files with advanced pattern matching
+  - Features:
+    - Multiple positioning modes:
+      - Line-based: Specify exact line numbers
+      - Pattern-based: Find positions using anchor text
+      - Context-aware: Verify surrounding content
+    - Insert modes: 'replace', 'before', or 'after' content
+    - Dry run preview of changes
+    - Cross-platform line ending support (CRLF/LF)
+    - Git-friendly content verification
+  - Inputs:
+    - `path` (string): File to edit
+    - `edits` (array): List of edit operations
+      - `startLine?` (number): Line number for edit (optional)
+      - `findAnchor?` (string): Text to locate edit position (optional)
+      - `anchorOffset` (number): Lines to offset from anchor (default: 0)
+      - `oldText` (string): Content to replace/verify
+      - `newText` (string): New content to insert
+      - `insertMode` (string): 'replace', 'before', or 'after' (default: 'replace')
+      - `beforeContext?` (string): Expected content before edit point (optional)
+      - `afterContext?` (string): Expected content after edit point (optional)
+      - `contextRadius` (number): Lines to check for context (default: 3)
+      - `verifyState` (boolean): Verify content matches before editing (default: true)
+      - `readBeforeEdit` (boolean): Refresh file state between edits (default: false)
+      - `dryRun` (boolean): Preview changes without applying them (default: false)
+  - Returns preview information for dry runs, otherwise applies changes
+  - Preserves original line endings and handles Git auto CRLF/LF
+
 - **create_directory**
   - Create new directory or ensure it exists
   - Input: `path` (string)