fullstack-qa-debugger

fullstack-qa-debugger is an agent for Claude Code from cfircoo/claude-code-toolkit. It costs 45 tokens per session (931 once invoked), scanned A, original, MIT.

A testing and debugging agent for applications with both user interfaces and server-side APIs. It can inspect React interface elements through react-grab, a tool that copies a component’s source context.

In plain words
What is it for?
Validating API responses, checking interface rendering and error states, inspecting components, and measuring page-load and API performance.
Why use it?
It checks whether data connections, loading behavior, empty results, errors, and unusual inputs work correctly instead of relying only on the normal path.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Validating API responses, checking interface rendering and error states, inspecting components, and measuring page-load and API performance.

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Install with agentmods
npx agentmods add agents/cfircoo/claude-code-toolkit/fullstack-qa-debugger
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/cfircoo/claude-code-toolkit

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for fullstack-qa-debugger

README.md
[![agentmods](https://agentmods.dev/badge/agents/cfircoo/claude-code-toolkit/fullstack-qa-debugger/github.svg)](https://agentmods.dev/agents/cfircoo/claude-code-toolkit/fullstack-qa-debugger)
Your own site
<a href="https://agentmods.dev/agents/cfircoo/claude-code-toolkit/fullstack-qa-debugger"><img src="https://agentmods.dev/badge/agents/cfircoo/claude-code-toolkit/fullstack-qa-debugger/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for fullstack-qa-debugger

Your own site · 80×15
<a href="https://agentmods.dev/agents/cfircoo/claude-code-toolkit/fullstack-qa-debugger"><img src="https://agentmods.dev/badge/agents/cfircoo/claude-code-toolkit/fullstack-qa-debugger.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 45 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 931 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00045 $0.00931
Opus 5.5 $0.00018 $0.00372
Sonnet 5.5 $0.00009 $0.00186
Haiku 4.5 $0.00005 $0.00093

Measured 1mo ago against content hash 9b7350e08e62, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fullstack-qa-debugger scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agents/fullstack-qa-debugger.md · 163 lines

What it actually says

<react_grab_integration> Fast Element Context Extraction using react-grab (https://github.com/aidenybai/react-grab):

How it works:

  1. User hovers over any UI element in browser
  2. User presses Cmd+C (Mac) or Ctrl+C (Windows)
  3. Clipboard contains: filename, component name, HTML source

This makes debugging 3x faster than manual file exploration.

When user provides react-grab context, parse into:

interface ReactGrabContext {
  html: string;
  componentName: string;
  filePath: string;
  line: number;
}

</react_grab_integration>

<validation_checklist> Data Integrity:

  • API endpoints return valid data
  • Response shapes match TypeScript interfaces
  • Null/undefined values handled gracefully
  • Date/time formats parse correctly

UI Rendering:

  • All components render without errors
  • Loading states display during fetch
  • Empty states show appropriate message
  • Error states are user-friendly

Edge Cases:

  • Empty data arrays show empty state
  • Long text truncates appropriately
  • Large numbers format correctly
  • Missing optional fields don't break UI

Performance:

  • Initial load < 3 seconds
  • API calls don't block UI
  • No unnecessary re-renders </validation_checklist>

<validation_report_schema>

interface ValidationReport {
  passed: boolean;
  timestamp: string;

  summary: {
    total_checks: number;
    passed_checks: number;
    failed_checks: number;
    warnings: number;
  };

  categories: {
    data_integrity: CheckResult[];
    ui_rendering: CheckResult[];
    edge_cases: CheckResult[];
    performance: CheckResult[];
  };

  issues: Issue[];
  recommendations: string[];
}

interface Issue {
  severity: 'critical' | 'major' | 'minor' | 'info';
  category: string;
  description: string;
  location: { file: string; line?: number };
  suggested_fix: {
    description: string;
    code_change?: { old: string; new: string };
  };
  auto_fixable: boolean;
}

</validation_report_schema>

<output_location> Write validation results to: .fullstack-state/knowledge-base.json (update validation field) </output_location>

<testing_commands>

# TypeScript compilation
npx tsc --noEmit

# Lint check
npx eslint src/ --ext .ts,.tsx

# Build verification
npm run build

</testing_commands>

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 163 lines · 45 tokens per session scan A 9b7350e08e62

Subscribe to this mod's changes

fullstack-qa-debugger is an agent published in the GitHub repository cfircoo/claude-code-toolkit (17 stars, last pushed 6mo ago), licensed MIT. It adds 45 tokens to every session and 931 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.