What is go-agent-skills copilot-instructions.md?

A collection of instructions and reusable skills for developing Go software, including style, architecture, error handling, documentation, and web service design. Go is a programming language often used for backend services and command-line tools.

Use it when starting, reviewing, refactoring, or documenting a Go project. It includes guidance for REST and gRPC services, project layout, interfaces, modern language features, and error handling.

It gives contributors shared conventions for writing, reviewing, and organizing Go code, making projects easier to understand and maintain.

How eduardo-sl/go-agent-skills configures GitHub Copilot

Reuse

Borrowing it

Nothing to install: this file belongs to eduardo-sl/go-agent-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/eduardo-sl/go-agent-skills/main/.github/copilot-instructions.md

Clone the repo

git clone --depth 1 https://github.com/eduardo-sl/go-agent-skills

Made for: GitHub Copilot.

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/instructions/eduardo-sl/go-agent-skills/copilot-instructions/github.svg)](https://agentmods.dev/instructions/eduardo-sl/go-agent-skills/copilot-instructions)

Your own site

<a href="https://agentmods.dev/instructions/eduardo-sl/go-agent-skills/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/eduardo-sl/go-agent-skills/copilot-instructions/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/instructions/eduardo-sl/go-agent-skills/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/eduardo-sl/go-agent-skills/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 748 This file is loaded in full into every session.

When invoked 748 The same file — it is already loaded in full.

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	$0.00748	$0.00748
Opus 5	$0.00374	$0.00374
Sonnet 5	$0.00150	$0.00150
Haiku 4.5	$0.00075	$0.00075

Measured 9d ago against content hash 5290394a8bed, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

go-agent-skills copilot-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 9d 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/copilot-instructions.md · 62 lines

How it starts

The opening of the file, as written. The whole thing — 62 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Go Agent Skills

This repository contains curated AI agent skills for Go development. Skills follow the Agent Skills specification (SKILL.md with YAML frontmatter).

Installation

npx skills add eduardo-sl/go-agent-skills -a copilot

Or manually: copy skills/*/*/ into .github/skills/.

Skills Catalog

Code Quality

go-coding-standards — Style conventions, naming, imports
go-code-review — Structured review with BLOCKER/WARNING/SUGGESTION severity
go-error-handling — Error wrapping, sentinel errors, custom types
go-context — Context propagation, cancellation, timeouts, values
go-modernize — Generics, slog, errors.Join, slices/maps, iterators
go-data-structures — Slices, maps, sets, aliasing, preallocation
go-documentation — Godoc conventions, examples, deprecation

Architecture & Design

go-architecture-review — Package layout, dependency direction, layering
go-project-layout — Scaffolding new projects, cmd/internal, thin main
go-interface-design — Consumer-side interfaces, composition, compliance checks
go-api-design — REST/gRPC handlers, middleware, graceful shutdown
go-grpc — Proto design, status codes, interceptors, streaming
go-design-patterns — Functional options, factory, strategy, decorator
go-dependency-injection — Constructor injection, composition root, wire/fx
go-cli — Flags, subcommands, exit codes, signals, Cobra
go-openapi — Spec-first REST, oapi-codegen, request validation, breaking-change detection
go-graphql — gqlgen resolvers, dataloaders, N+1, complexity limits, field-level auth

Data

go-database — Connection pools, transactions, sqlc, migrations

Safety & Performance

go-concurrency-review — Goroutine lifecycle, channels, mutexes, race detection
go-security-audit — OWASP, SQL injection, auth, secrets management
go-performance-review — Allocations, benchmarking, pprof
go-observability — Structured logging, tracing, metrics, OpenTelemetry
go-troubleshooting — Panics, deadlocks, leaks, pprof diffing, delve
go-defensive-coding — Typed-nil interfaces, slice aliasing, numeric overflow, defensive copying

Read the full file on GitHub · 62 lines

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.

9d ago First seen · 62 lines · 748 tokens per session scan A 5290394a8bed

Subscribe to this mod's changes

go-agent-skills copilot-instructions.md is an instructions file published in the GitHub repository eduardo-sl/go-agent-skills (71 stars, last pushed 21d ago), licensed MIT. It adds 748 tokens to every session, about $0.0037 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.

Go Languages

next.js AGENTS.md

AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.

vercel/next.js · 7,296 tokens

codex AGENTS.md

AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.

openai/codex · 5,153 tokens

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 6,785 tokens

go-agent-skills: Instructions file for GitHub Copilot