agentmods.dev

qgroundcontrol forward-declarations.instructions.md

Code-review guidance for C++ header files that recommends forward declarations or smaller headers when a full class definition is unnecessary. A forward declaration names a class without loading its complete implementation.

In plain words
What is it for?
Use it when reviewing C++ headers that mention Vehicle or MAVLink types, to decide whether to forward-declare a class or include a specific lightweight type header.
Why use it?
Large headers increase compile work and can make dependencies harder to maintain. The guidance helps keep headers lighter while preserving the definitions needed by the code.

Instructions file for GitHub Copilot

4.9k 2d ago A scan 246 tokens original Apache-2.0
View the source file mavlink/qgroundcontrol
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.

agentmods
npx agentmods add instructions/mavlink/qgroundcontrol/forward-declarations
Clone the repo
git clone --depth 1 https://github.com/mavlink/qgroundcontrol

Made for: GitHub Copilot.

Per session 246 This file is loaded in full into every session.
When invoked 246 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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 $0.00246 $0.00246
Opus 5 $0.00123 $0.00123
Sonnet 5 $0.00049 $0.00049
Haiku 4.5 $0.00025 $0.00025

Measured 2d ago against content hash 3a75729a7a0c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

qgroundcontrol forward-declarations.instructions.md 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 2d 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.

.github/instructions/forward-declarations.instructions.md · 24 lines

What it actually says

Forward Declaration Rules for Headers

Prefer forward declarations and lightweight type headers over including full class definitions.

Vehicle.h

Vehicle.h is one of the heaviest headers in the codebase. Most headers that reference Vehicle only need:

  • A pointer/reference to Vehicle → class Vehicle; forward declaration
  • Vehicle type aliases → #include "VehicleTypes.h"

Only include Vehicle.h if the header calls Vehicle methods, accesses Vehicle members, or inherits from Vehicle.

QGCMAVLink.h combines MAVLink enums, message types, and QGC-specific type aliases. Most headers only need one of these. Use the specific lightweight header instead:

  • MAVLinkEnums.h for enum constants
  • MAVLinkMessageType.h for mavlink_message_t
  • QGCMAVLinkTypes.h for FirmwareClass_t, VehicleClass_t
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. 2d ago First seen · 24 lines · 246 tokens per session scan A 3a75729a7a0c

Subscribe to this mod's changes

qgroundcontrol forward-declarations.instructions.md is an instructions file published in the GitHub repository mavlink/qgroundcontrol (4,881 stars, last pushed 2d ago), licensed Apache-2.0. It adds 246 tokens to every session, about $0.0012 per session on Opus 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.

Code reviewdronemavlinkpx4qtuasuav
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