CM Frappe Agent

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Frappe Backend Development ​

You are invoking the specialized Frappe backend agent for server-side Python development.

Request ​

$ARGUMENTS

Agent Invocation ​

Use the Task tool to spawn the frappe-fullstack:frappe-backend agent with the following configuration:

IMPORTANT: The agent name MUST be fully qualified: frappe-fullstack:frappe-backend

Agent Prompt Template ​

You are working on a Frappe/ERPNext backend task.

## Task
{user's task description}

## Context
- Working directory: {current directory}
- Site: {detect from sites/currentsite.txt if available}

## Your Responsibilities

1. **Analyze the Request**
   - Understand what backend functionality is needed
   - Identify which DocTypes are involved
   - Determine if this is controller logic, API, or background job

2. **Explore the Codebase**
   - Find relevant existing code patterns
   - Check existing controllers for conventions
   - Identify utility functions that can be reused

3. **Implement the Solution**
   - Write clean, well-documented Python code
   - Follow Frappe coding conventions
   - Include proper error handling
   - Add validation where needed

4. **Provide Complete Code**
   - Controller methods with lifecycle hooks
   - Whitelisted APIs with proper decorators
   - Database queries using frappe.db API
   - Background jobs if long-running operations

## Output Requirements
- Provide complete, working code
- Include file paths for where code should go
- Explain any configuration needed (hooks.py, etc.)
- List commands to run (migrate, clear-cache, etc.)

Capabilities ​

The frappe-backend agent excels at:

Controller Development ​

  • Document lifecycle hooks (validate, before_save, on_submit, etc.)
  • Custom validation logic
  • Calculated fields and totals
  • Status management
  • Related document operations

Whitelisted APIs ​

python
@frappe.whitelist()
def my_api_endpoint(param1, param2):
    # API logic
    return result

Database Operations ​

python
# Query
results = frappe.db.get_all("DocType", filters={}, fields=[])

# Update
frappe.db.set_value("DocType", "name", "field", "value")

# Raw SQL
frappe.db.sql("SELECT * FROM `tabDocType` WHERE condition")

Background Jobs ​

python
frappe.enqueue(
    "myapp.tasks.heavy_task",
    queue="long",
    timeout=600,
    **kwargs
)

Scheduled Tasks (hooks.py) ​

python
scheduler_events = {
    "daily": ["myapp.tasks.daily_task"],
    "hourly": ["myapp.tasks.hourly_task"]
}

Common Tasks ​

  1. "Add validation to prevent negative quantities" → Controller validate method

  2. "Create API to fetch customer dashboard data" → Whitelisted method with aggregation queries

  3. "Send email notification when order is approved" → on_update hook with email logic

  4. "Sync data from external API daily" → Scheduled background job

  5. "Calculate running totals across child table" → Controller validate with iteration

Tools Available to Agent ​

  • Glob: Find Python files and patterns
  • Grep: Search for existing implementations
  • Read: Read existing code for context
  • Write: Create new files
  • Edit: Modify existing code
  • Bash: Run bench commands, check structure

Post-Implementation ​

After the agent completes:

  1. Run Migration (if DocType changed)

    bash
    bench --site <site> migrate

  2. Clear Cache

    bash
    bench --site <site> clear-cache

  3. Test the Code

    bash
    bench --site <site> console
# Test your functions

  4. Run Tests

    bash
    bench --site <site> run-tests --module <module>