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 agentmods add rules/mitas/cursor-rules/golanggit clone --depth 1 https://github.com/mitas/cursor-rulesWhat 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 | $0.00000 | $0.02532 |
| Opus 5 | $0.00000 | $0.01266 |
| Sonnet 5 | $0.00000 | $0.00506 |
| Haiku 4.5 | $0.00000 | $0.00253 |
Grade A, and why
golang 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 yesterday.
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 — 298 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Go (Golang) Coding Standards
Project Structure
Note: For comprehensive project structure guidelines, refer to golang-project-structure.mdc
- Organize code into logical packages
- Package names should be lowercase, short, and not plural
- Follow the standard Go project layout (cmd/, pkg/, internal/)
- Use
/internalfor code not meant to be imported by other projects - Separate models, services, and controllers
- Group related functionality in the same package
- Implement repository pattern for data access
- Organize tests in the same package as production code with
_test.gosuffix
Interfaces and Types
Interface Design
- No pointers to interfaces: pass interfaces as values
- Verify interface compliance at compile time:
var _ Interface = (*Implementation)(nil) - Keep interfaces small and focused (ideally 1-3 methods)
- Use interfaces at package boundaries for better testing
- Design interfaces for consumers, not implementations
- Don't export interfaces for concrete types with a single implementation
Method Receivers
- Use value receivers for methods that don't modify the receiver
- Use pointer receivers for methods that modify the receiver
- Be consistent with receiver types for the same struct
- Methods with value receivers can be called on pointers as well as values
- Methods with pointer receivers can only be called on pointers or addressable values
- If any method requires a pointer receiver, use pointer receivers for all methods
Type Assertions
- Always use the "comma ok" idiom:
val, ok := x.(T) - Don't use type assertions without checking the result
- Use type switches for multiple potential types
- Consider using the
errors.Asfunction for error type checking
Error Handling
Error Creation
- Return errors instead of using panic
- Create specialized error types for specific error cases
- Implement Error() string method for custom error types
- Use
errors.Newfor simple errors - Add context when wrapping errors:
fmt.Errorf("doing X: %w", err) - Use
%wverb for error wrapping to preserve the original error
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.
- yesterday First seen · 298 lines · 2,532 tokens per session scan A 2efb57364b30
golang is a cursor rule published in the GitHub repository mitas/cursor-rules (2 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 2,532 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 2026-08-31.
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