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.
git clone --depth 1 https://github.com/beel-collab/presets.devWrote 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/rules/beel-collab/presets.dev/go-rules)<a href="https://agentmods.dev/rules/beel-collab/presets.dev/go-rules"><img src="https://agentmods.dev/badge/rules/beel-collab/presets.dev/go-rules/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/rules/beel-collab/presets.dev/go-rules"><img src="https://agentmods.dev/badge/rules/beel-collab/presets.dev/go-rules.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00000 | $0.01182 |
| Opus 5.5 | $0.00000 | $0.00473 |
| Sonnet 5.5 | $0.00000 | $0.00236 |
| Haiku 4.5 | $0.00000 | $0.00118 |
Grade A, and why
go-rules 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 today.
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 — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Go Rules for Cursor: Errors, Context and Goroutines
Install
Install the native export at .cursor/rules/go-rules.mdc.
Copy that export, not this catalog file. Catalog fields such as tools and author are for presets.dev.
Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read .agents/skills, so a second copy with the same name collides.
Go Rules for Cursor: Errors, Context and Goroutines
File-scoped Cursor rule for Go. It attaches when a matching file is in context.
Updated for Go 1.27.4, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
Go 1.27.4 is the current stable release on go.dev/dl. Go 1.26.11 is the other stable line. Stay on the version in go.mod. Go 1.27 adds generic methods. encoding/json is backed by encoding/json/v2 on this release. Behavior of the v1 API is preserved. GOEXPERIMENT=nojsonv2 restores the old implementation and is a temporary opt-out, not the default. The simd package stays experimental and turns on only with GOEXPERIMENT=simd. Do not set that flag because it exists. Import encoding/json/v2 only when the task asks for the new API.
Project shape
go.mod names the module. Packages are small and named for what they provide. internal/ is for code other modules must not import. Match the existing layout. Commands live in cmd/ when the repo already does that.
Format with gofmt. Vet and the project's linters are part of the check, not optional decoration.
Errors
Check every error. _ = do() is a bug unless the comment says why the error cannot matter. Wrap with %w when the caller should use errors.Is or errors.As. A sentinel or a typed error is the project's existing style. Do not panic for a request failure. panic is for a broken invariant during startup, and even then main should fail with an error when it can.
Context and goroutines
The first argument of a request-scoped function is context.Context. Pass ctx. Do not store a context in a struct. When the caller cancels, the work stops: a select on ctx.Done(), a query that takes ctx, an HTTP request built with NewRequestWithContext.
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.
- today First seen · 103 lines · 0 tokens per session scan A 238c3049238b
go-rules is a cursor rule published in the GitHub repository beel-collab/presets.dev (3 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,182 tokens. 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 2026-11-13.
go-rules compared with cursor rules from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| go-rulesbeel-collab/presets.dev | Cursor rule | 3 | yesterday | MIT | A | 0 | Cursor |
| ponytailDietrichGebert/ponytail | Cursor rule | 190k | 15d ago | MIT | A | 604 | Cursor |
| angular-20angular/angular | Cursor rule | 101k | today | MIT | A | 0 | Cursor |
| dev-standardapache/superset | Cursor rule | 76k | today | Apache-2.0 | A | 1,147 | Cursor |
| prefer-direct-imports-over-module-mocksprisma/orm | Cursor rule | 48k | today | Apache-2.0 | A | 0 | Cursor |
| config-validation-and-normalizationprisma/orm | Cursor rule | 48k | today | Apache-2.0 | A | 0 | Cursor |
| control-plane-descriptorsprisma/orm | Cursor rule | 48k | today | Apache-2.0 | A | 0 | Cursor |