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Give your coding agent repository-specific rules, not a generic commit template. Base them on recent commits and the project’s contribution guide; tell the agent what the subject and body should convey, when to use local prefixes or trailers, and to describe only what the staged change supports. Then review its proposed message before committing. Instructions improve consistency, but do not guarantee compliance.
Start with the conventions your team already uses
Before writing instructions, look at a representative set of recent commits and the repository’s contribution guide. Git recommends checking project history when local style is unclear: Git’s contribution guidance.
Note the practices that actually recur:
- How subjects are capitalized and whether they include a scope, ticket number, or type prefix.
- Whether commit bodies are common, reserved for complex changes, or rarely used.
- Whether the project requires trailers such as sign-offs or issue references.
Do not impose Conventional Commits, a ticket prefix, or a trailer just because it is familiar elsewhere. If the repository does not use one, adding it can make agent-written messages less consistent with the history the team reads.
Give the agent a compact, evidence-based rule
Tell the agent to inspect the staged change, match the project’s conventions, and distinguish the change’s effect from its motivation. Here is a prompt you can adapt:
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- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
When preparing a commit message, inspect the staged diff and follow the conventions in recent commits and CONTRIBUTING.md. Write a concise subject that describes the change’s actual effect. If a body is useful, explain the problem and why this change addresses it. Use imperative wording if that matches this repository’s convention. Do not claim tests, motivations, issue links, or behavior that the staged change does not establish. Do not add a type or scope prefix, or a trailer, unless the project requires it.
This is a practical instruction, not an official platform-prescribed prompt. Its key safeguard is tying the message to the staged diff: an agent should not turn assumptions about intent, testing, or behavior into factual claims.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Make the subject useful in a log
Git treats the text before the first blank line as the commit title, which appears in Git output and can serve as a patch email subject. Its commit documentation recommends a short summary followed by a blank line and a fuller description. It says a first line of no more than 50 characters is a good idea, not a universal requirement.
Ask for a subject that states the meaningful effect of the change, in the project’s usual style. Avoid instructions like “always use 50 characters” unless the team has adopted that rule. A short title that obscures the change is not more useful than a slightly longer one that makes it clear.
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Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Use a body when it adds necessary context
A body earns its place when the subject cannot explain the problem being addressed or why the chosen solution makes sense. Git’s contribution guidance recommends explaining the problem and justifying the solution, with enough context to make the message meaningful on its own rather than sending readers elsewhere.
Imperative wording is a common Git recommendation, but the team’s established convention should decide whether the agent uses it. Likewise, do not require a body on every commit if the project’s history does not.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Put instructions where the agent can use them
GitHub Copilot
GitHub documents repository-wide custom instructions in .github/copilot-instructions.md and identifies commit-message generation as a use case. See About customizing GitHub Copilot responses. Keep the message rules concise and specific to the repository.
Visual Studio Code
VS Code documents automatic discovery of .github/copilot-instructions.md for chat requests in a workspace. Local agent instruction discovery has a separate setting. Feature support varies across Copilot surfaces and IDEs, so check the current VS Code custom-instructions documentation for the feature you use.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Review the message and add a stricter check if needed
Natural-language instructions guide the agent; they do not enforce perfect behavior. GitHub cautions that Copilot may not follow custom instructions exactly every time. For each proposed message, check that it matches the staged change and does not invent a test result, rationale, issue link, or convention.
For teams that need a mechanical format check, Git supports a commit-msg hook that can inspect, reject, or normalize a proposed message. Git documents that it can be bypassed with --no-verify, so it is a workflow backstop, not an absolute guarantee. Instructions are more suitable for shaping clarity and context; hooks are better suited to rules that can be checked mechanically.
Quick Recap
Choose the rules by what they improve
| Consideration | Question to ask |
|---|---|
| Local fit | Does the format match recent commits and the contribution guide? |
| Scanability | Can a teammate understand the change from the subject in a log? |
| Context | When the subject is not enough, does the body explain the problem and rationale? |
| Enforceability | Is written guidance sufficient, or does the project need a hook for rules that can be checked mechanically? |
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