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.
npx skills add fusengine/agents --skill go-core-idiomsgit clone --depth 1 https://github.com/fusengine/agentsWrote 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.
[](https://agentmods.dev/skills/fusengine/agents/go-core-idioms)<a href="https://agentmods.dev/skills/fusengine/agents/go-core-idioms"><img src="https://agentmods.dev/badge/skills/fusengine/agents/go-core-idioms/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.
<a href="https://agentmods.dev/skills/fusengine/agents/go-core-idioms"><img src="https://agentmods.dev/badge/skills/fusengine/agents/go-core-idioms.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00037 | $0.01312 |
| Opus 5.5 | $0.00015 | $0.00525 |
| Sonnet 5.5 | $0.00007 | $0.00262 |
| Haiku 4.5 | $0.00004 | $0.00131 |
Grade A, and why
go-core-idioms 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 23d 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.
How it starts
The opening of the file, as written. The whole thing — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Go Core Idioms
Idiomatic sequential Go for 1.27. For anything touching goroutines, channels,
errgroup, or context cancellation, use go-concurrency instead.
Agent Workflow (MANDATORY)
Before ANY implementation, spawn 3 agents in parallel, one Agent call each with a name:
- fuse-ai-pilot:explore-codebase - Map existing error/logging/interface patterns
- fuse-ai-pilot:research-expert - Verify latest Go docs via Context7/Exa
- mcp__context7__query-docs - Confirm stdlib signatures (errors, log/slog)
After implementation, run fuse-ai-pilot:sniper for validation.
Overview
| Feature | Description |
|---|---|
| Error handling | Explicit if err != nil, %w wrapping, errors.Join, errors.AsType (1.26) |
| Structured logging | log/slog stdlib — handlers, attrs, groups, LogValuer |
| Generics | Type params, constraints, self-referential types (1.26), generic methods (1.27) |
| Interfaces | Small, consumer-side — "accept interfaces, return structs" |
| Modernizers | go fix auto-applies dozens of idiom/API fixers (1.26; more added in 1.27) |
Critical Rules
- Explicit
if err != nil- No sugar exists; never discard with_ = err - Wrap with
%w, not%v- Preserves the chain forerrors.Is/As/AsType - Accept interfaces, return structs - Define interfaces where consumed, not where produced
- Value receivers by default - Use pointer receivers only for mutation or large structs
- Run
go fix+go vet- Let modernizers migrate to current idioms (1.26+)
What ships with it
7 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 23d ago Changed f186adaf35fb
- 1mo ago Changed 85730689ab6b
- 1mo ago First seen · 135 lines · 37 tokens per session scan A 9b0fc097524a
go-core-idioms is a skill published in the GitHub repository fusengine/agents (33 stars, last pushed 8d ago), licensed MIT. It adds 37 tokens to every session and 1,312 once invoked, about $0.0001 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 2026-09-03.
Other skills, from other repositories
building-telegram-bots
Writes correct, version-aware Telegram bot code. Use when writing, extending, or debugging a Telegram bot in python-telegram-bot, aiogram, grammY, or Telegraf. Not for Telegram client API (TDLib), languages other than Python and Node.js, or non-Telegram platforms.
integrate-arcjet-guard-agent-framework-go
Integrate Arcjet Guard into Microsoft Agent Framework for Go (github.com/microsoft/agent-framework-go). Wrap a functool or MCP tool with GuardTool, guard every tool an agent can see and screen inbound text with GuardMiddleware, or guard any Go function with arcjet.GuardAction. Use when asked to add Arcjet to a Go…
pennylane
Builds and differentiates PennyLane quantum circuits, hybrid PyTorch or JAX models, molecular VQE and QAOA workflows. Use for variational quantum algorithms, quantum machine learning, simulator validation, and moving validated circuits to provider plugins. For hardware-specific compilation use qiskit or cirq; for…
architect
Design the idiomatic Elixir architecture for a rewrite: set the compatibility bar (ADR-000), consult phx specialists on open questions, then build contexts, ledger and ADRs. Use after /rewrite:analyze.
phx-deps-update
Bump outdated Hex deps — inventory, snapshot changelogs, update, fix breaks, split reviewable PRs (patches bundled, majors solo). Use to upgrade/bump Elixir dependencies or when versions fall behind. NOT for deps.get failures (phx-investigate).
phx-document
Use when asked to document Elixir code: add or fill in @moduledoc and @doc for modules and functions. Documents tested code only; may add a README section or ADR. Not for docs lookup or audits.