What is qt-app-reviewer?

A reviewer for Qt applications, which are programs built with the Qt user-interface framework. It checks code for correctness, maintainability, testing concerns, and common Qt mistakes.

Use it after creating or changing Qt or PySide6 widgets and application code. It reviews layouts, signals, threads, object naming, architecture, and cleanup.

It helps find problems such as changing the interface from the wrong thread, blocking the interface while doing slow work, or failing to clean up resources.

qt-app-reviewer — Agent for Claude Code by L3DigitalNet

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add L3DigitalNet/Claude-Code-Plugins

Claude Code

/plugin install qt-suite

Made for: Claude Code.

Or install qt-suite, the plugin that ships this one along with the rest of its 6 commands, 6 agents.

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/l3digitalnet/claude-code-plugins/qt-app-reviewer/github.svg)](https://agentmods.dev/agents/l3digitalnet/claude-code-plugins/qt-app-reviewer)

Your own site

<a href="https://agentmods.dev/agents/l3digitalnet/claude-code-plugins/qt-app-reviewer"><img src="https://agentmods.dev/badge/agents/l3digitalnet/claude-code-plugins/qt-app-reviewer/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/l3digitalnet/claude-code-plugins/qt-app-reviewer"><img src="https://agentmods.dev/badge/agents/l3digitalnet/claude-code-plugins/qt-app-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 260 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 685 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.

Model	Per session	Once invoked
Fable 5.1	$0.00260	$0.00685
Opus 5.5	$0.00104	$0.00274
Sonnet 5.5	$0.00052	$0.00137
Haiku 4.5	$0.00026	$0.00068

Measured 1mo ago against content hash 6d2e904d8cd8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

qt-app-reviewer 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.

plugins/qt-suite/agents/qt-app-reviewer.md · 66 lines

What it actually says

Qt Application Code Reviewer

Read these references at the start of the session for domain knowledge:

${CLAUDE_PLUGIN_ROOT}/references/qt-architecture.md
${CLAUDE_PLUGIN_ROOT}/references/qt-signals-slots.md
${CLAUDE_PLUGIN_ROOT}/references/qt-threading.md

You are a Qt application code reviewer. Review Qt code for correctness, testability, and maintainability.

Review Criteria

🔴 Critical (must fix)

Widget stored in local variable instead of self._widget (GC risk)
UI widget modified from a non-main thread
Missing Q_OBJECT macro in C++ QObject subclasses
QApplication constructed more than once
Blocking I/O on the main thread

🟡 Important (should fix)

Interactive widgets missing setObjectName() — breaks gui-tester compatibility
Signal connections made after moveToThread without re-connecting
setGeometry() used instead of layout managers
Business logic embedded directly in widget methods (MVP violation)
Missing closeEvent override for cleanup (timers, threads, resources)

🟢 Advisory (consider)

sizeHint() not implemented on custom widgets
Layout margins and spacing not explicitly set (rely on style defaults)
setTabOrder() not called for keyboard navigation
Hardcoded pixel sizes instead of QFontMetrics-relative sizing

Response Format

Lead with findings grouped by severity. For each finding:

File and line: exact location
Issue: what's wrong and why it matters
Fix: minimal code change to address it

End with a summary: N critical, M important, P advisory.

Do not report findings you are not confident about. Only report issues you can identify with certainty from the code.

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.

1mo ago First seen · 66 lines · 260 tokens per session scan A 6d2e904d8cd8

Subscribe to this mod's changes

qt-app-reviewer is an agent published in the GitHub repository L3DigitalNet/Claude-Code-Plugins (8 stars, last pushed 1mo ago), licensed MIT. It adds 260 tokens to every session and 685 once invoked, about $0.0010 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 2026-08-31.

Code review

cpp-reviewer

Expert C++ code reviewer specializing in memory safety, modern C++ idioms, concurrency, and performance. Use for all C++ code changes. MUST BE USED for C++ projects.

affaan-m/ECC · 41 tokens

thermo-nuclear-code-quality-review-subagent

Thermo-nuclear code quality audit (maintainability, structure, 1k-line rule, spaghetti, code-judo). Invoked through the Agent tool after a parent gathers diff and file contents. Loads rubric from the thermo-nuclear-code-quality-review skill in this plugin.

michael-denyer/pstack-claude · 68 tokens

karimo-implementer

Executes coding tasks (complexity 1-4) from KARIMO PRDs. Writes production code, follows existing patterns, validates before committing. Use for straightforward feature implementation, refactoring, and bug fixes.

opensesh/KARIMO · 49 tokens

reviewer

Read-only reviewer for an SDD implementation — checks that the change satisfies the acceptance criteria it claims (stage 1) and meets quality/convention/edge-case bars (stage 2). Use after a task (or the whole feature) reaches GREEN, before it's considered done. It reads the diff and the upstream artifacts and reports…

genkovich/sdd · 81 tokens

atomic-auditor

Final gate for a finished implementation. Dispatched exactly once after the implement-review loop goes green, never per iteration. Never touches the repo; its one write is the audit report into the task scratchpad. Audits the delivered work as a whole: cumulative spec compliance, cross-iteration coherence…

damusix/atomic-claude · 169 tokens

Reviewer

Mandatory fast reviewer: validates every agent delegation output before acceptance. Checks acceptance criteria, file partitions, regressions, type safety, security basics.

monkilabs/opencastle · 30 tokens