name: frappe-agent-debugger description: > Use when debugging Frappe errors, using bench console for live inspection, analyzing tracebacks, or reading Frappe log files. Prevents wasted debugging time from ignoring log context, misreading tracebacks, and not using bench console effectively. Covers bench console, frappe.logger, error log DocType, traceback analysis, common error patterns, log file locations, pdb/debugger integration, VS Code DAP, profiling, Frappe Recorder, mariadb diagnostics. Keywords: debug, bench console, traceback, error log, frappe.logger, pdb, debugging, log analysis, inspect, VS Code, DAP, profiling, recorder, mariadb, monitor, ERPNext error, how to debug, find the bug, what went wrong, stack trace, error message.. license: MIT compatibility: "Claude Code, Claude.ai Projects, Claude API. Frappe v14-v16." metadata: author: OpenAEC-Foundation version: "2.0"

Frappe Debugging Agent

Systematically diagnoses Frappe/ERPNext issues by classifying errors, locating relevant code, and applying targeted diagnosis checklists.

Purpose: Eliminate trial-and-error debugging — follow a deterministic diagnostic workflow.

When to Use This Agent

ERROR ANALYSIS TRIGGER
|
+-- Python traceback or error message
|   "ImportError: cannot import name X from frappe"
|   --> USE THIS AGENT
|
+-- JavaScript console error
|   "Uncaught TypeError: frm.set_value is not a function"
|   --> USE THIS AGENT
|
+-- Silent failure (no error, wrong behavior)
|   "Server Script runs but nothing happens"
|   --> USE THIS AGENT
|
+-- Scheduler/background job failure
|   "Job X failed" in scheduler logs
|   --> USE THIS AGENT
|
+-- Build/asset errors
|   "Module not found" or blank page after build
|   --> USE THIS AGENT

Debugging Workflow

STEP 1: CLASSIFY ERROR TYPE
  Python | JavaScript | Database | Permission | Hook | Scheduler | Build

STEP 2: IDENTIFY THE MECHANISM
  Controller | Server Script | Client Script | Hook | Scheduler | API

STEP 3: LOCATE RELEVANT CODE
  Use Frappe file path conventions to find source

STEP 4: APPLY DIAGNOSIS CHECKLIST
  Run type-specific checklist for the error class

STEP 5: SUGGEST FIX
  Provide corrected code + reference relevant frappe-* skills

See references/workflow.md for detailed steps.

Step 1: Error Classification

Step 2: Mechanism Identification

Step 3: File Path Conventions

ALWAYS check these locations based on the mechanism:

Step 4: Diagnosis Checklists (Quick Reference)

Python Errors

JavaScript Errors

Database Errors

Permission Errors

Debug Tools

bench console (Python REPL)

bench --site {site} console
# Then:
frappe.get_doc("Sales Invoice", "SINV-00001")  # Inspect document
frappe.db.sql("SELECT name FROM `tabSales Invoice` LIMIT 5")  # Raw SQL
frappe.get_hooks("doc_events")  # Inspect active hooks
frappe.get_all("Server Script", filters={"disabled": 0}, fields=["name", "script_type"])

bench mariadb (SQL shell)

bench --site {site} mariadb
-- Then:
SHOW CREATE TABLE `tabSales Invoice`;
SELECT * FROM `tabError Log` ORDER BY creation DESC LIMIT 10;

bench doctor

bench doctor  # Check scheduler, workers, background jobs

frappe.logger()

logger = frappe.logger("my_debug", allow_site=True)
logger.info(f"Variable value: {my_var}")
# Logs to: sites/{site}/logs/my_debug.log

Browser DevTools

Console tab  → JavaScript errors
Network tab  → Failed API calls (check response body for traceback)
Application tab → Session/cookie issues

Log File Locations

Common Error Patterns Table

Agent Output Format

ALWAYS produce debugging output in this format:

## Debug Report

### Error Classification
**Type**: [Python/JS/Database/Permission/Hook/Scheduler/Build]
**Mechanism**: [Controller/Server Script/Client Script/Hook/etc.]

### Root Cause
[One-sentence diagnosis]

### Evidence
- [What log/traceback line confirms this]
- [What code path is involved]

### Fix
[Corrected code or configuration change]

### Verification Steps
1. [How to confirm the fix works]
2. [What to check in logs/UI]

### Referenced Skills
- `frappe-*`: [what was consulted]

Debugging Decision Tree

ERROR RECEIVED
|
+-- Has traceback?
|   +-- YES: Read LAST line first (actual error)
|   |   +-- Contains ".py" --> Python error (Step 4: Python checklist)
|   |   +-- Contains "SQL" --> Database error (Step 4: Database checklist)
|   +-- NO: Check browser console
|       +-- Has JS error --> JavaScript error (Step 4: JS checklist)
|       +-- No error visible --> Silent failure
|           +-- Check Error Log DocType
|           +-- Check frappe.log
|           +-- Add frappe.logger() statements
|
+-- Error after bench command?
|   +-- After migrate --> Hook/schema issue
|   +-- After build --> Frontend asset issue
|   +-- After update --> Version compatibility issue
|
+-- Intermittent error?
    +-- Check scheduler logs
    +-- Check worker logs
    +-- Check for race conditions (TimestampMismatchError)

See references/checklists.md for complete diagnosis checklists. See references/examples.md for debugging walkthrough examples. See references/advanced-debugging.md for VS Code DAP setup, bench console patterns, mariadb diagnostics, and profiling tools.