---

name: coder description: Coding assistant capabilities including file investigation, reading, searching, editing, and command execution. allowed-tools:

• investigate_and_save_report
• read_code_file
• search_in_files
• edit_code_file
• apply_edit_blocks
• run_terminal_command
• create_file

---

Coder Skill

This skill provides the agent with capabilities to act as a coding assistant, exploring projects, reading code, and making edits.

Tools

investigate_and_save_report

Investigates a folder structure and writes a markdown summary named ".test.Agent.md" in that folder.

• folder_path: The absolute path of the folder to investigate.

read_code_file

Read a code file incrementally.

• file_path: Absolute path to the file.
• start_line: Starting line number (1-based, inclusive). Default is 1.
• end_line: Ending line number (1-based, inclusive). Default is -1 (end of file).

search_in_files

Use grep to search for patterns in files within a directory.

• folder_path: The directory to search in.
• pattern: The text or regex pattern to search for.

edit_code_file

Edit a code file by replacing an exact text block.

• file_path: Absolute path to the file.
• old_string: The exact string to find and replace.
• new_string: The string to replace it with.

apply_edit_blocks

Apply multiple search/replace edits to a file in a single pass. This is PREFERRED over edit_code_file for complex changes.

• file_path: Absolute path to the file.
• edits: A string containing one or more edit blocks using the SEARCH/REPLACE format.

create_file

Create a new file with optional content, overwrite existing file, or append.

• file_path: Absolute path to the file.
• content: Optional text content to write.
• overwrite: If True (default), overwrite existing file.
• append: If True, append content to existing file.

run_terminal_command

Run terminal commands.

• command: The full shell command to execute.

Usage Strategy: Reliable Code Editing

To edit files efficiently and correctly using apply_edit_blocks, follow this distinct workflow. This method prevents "SEARCH block not found" errors by ensuring you have the exact text.

Standard Workflow

1. Locate: Read the file (read_code_file) to find the approximate location of the code you want to change.
2. Extract Exact Context:
   • Once you identify the lines (e.g., lines 10-15), use sed to extract exactly those lines.
   • Command: sed -n '10,15p' <filename>
   • This output provides the perfect text for your SEARCH block, guaranteeing a match.
3. Apply Edit:
   • Copy the output from step 2 into the <<<<<<< SEARCH block.
   • Write your new code in the ======= ... >>>>>>> REPLACE block.
   • Call apply_edit_blocks.

Rules for apply_edit_blocks

1. SEARCH Blocks Must Be Exact: The tool performs a string find. Any difference in whitespace or indentation will cause it to fail. Using sed or cat to get the raw text is safer than remembering it. Note: Avoid using cat -a on Windows or macOS, as the -a flag is not available. Use sed or plain cat instead.
2. Use Sufficient Context: Include 3-5 lines of context in your SEARCH block to ensure it is unique within the file.
3. Multiple Edits: You can pass multiple SEARCH/REPLACE blocks in one tool call to perform several edits at once.

Example

Goal: Change a print statement on line 42.

1. Check Content:

   sed -n '40,45p' main.py
   

   Output:

       if x > 0:
           print("Positive")
           return True
   

2. Call Tool:

   {
     "file_path": "/abs/main.py",
     "edits": "<<<<<<< SEARCH\n    if x > 0:\n        print(\"Positive\")\n        return True\n=======\n    if x > 0:\n        print(\"Found positive value\")\n        return True\n>>>>>>> REPLACE"
   }