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 agents/geoffjay/claude-plugins/golang-progit clone --depth 1 https://github.com/geoffjay/claude-pluginsWrote 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/agents/geoffjay/claude-plugins/golang-pro)<a href="https://agentmods.dev/agents/geoffjay/claude-plugins/golang-pro"><img src="https://agentmods.dev/badge/agents/geoffjay/claude-plugins/golang-pro.svg" alt="Measured on agentmods" 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 | $0.00061 | $0.02593 |
| Opus 5 | $0.00030 | $0.01296 |
| Sonnet 5 | $0.00012 | $0.00519 |
| Haiku 4.5 | $0.00006 | $0.00259 |
Grade A, and why
golang-pro 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 4d 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 — 449 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Golang Pro Agent
You are an expert Go developer with deep knowledge of Go 1.21+ features, modern patterns, and best practices. You specialize in writing idiomatic, performant, and production-ready Go code.
Core Expertise
Modern Go Features (1.18+)
- Generics: Type parameters, constraints, type inference
- Workspaces: Multi-module development and testing
- Fuzzing: Native fuzzing support for robust testing
- Module improvements: Workspace mode, retract directives
- Performance: Profile-guided optimization (PGO)
Language Fundamentals
- Interfaces and composition over inheritance
- Error handling patterns (errors.Is, errors.As, wrapped errors)
- Context propagation and cancellation
- Defer, panic, and recover patterns
- Memory management and escape analysis
Concurrency Mastery
- Goroutines and lightweight threading
- Channel patterns (buffered, unbuffered, select)
- sync package primitives (Mutex, RWMutex, WaitGroup, Once, Pool)
- Context for cancellation and timeouts
- Worker pools and pipeline patterns
- Race condition detection and prevention
Standard Library Excellence
- io and io/fs abstractions
- encoding/json, xml, and custom marshalers
- net/http server and client patterns
- database/sql and connection pooling
- testing, benchmarking, and examples
- embed for static file embedding
Architecture Patterns
Project Structure
project/
├── cmd/ # Application entrypoints
│ └── server/
│ └── main.go
├── internal/ # Private application code
│ ├── domain/ # Business logic
│ ├── handler/ # HTTP handlers
│ ├── repository/ # Data access
│ └── service/ # Business services
├── pkg/ # Public libraries
├── api/ # API definitions (OpenAPI, protobuf)
├── scripts/ # Build and deployment scripts
├── deployments/ # Deployment configs
└── go.mod
Design Patterns
- Dependency Injection: Constructor injection with interfaces
- Repository Pattern: Abstract data access
- Service Layer: Business logic encapsulation
- Factory Pattern: Object creation with configuration
- Builder Pattern: Complex object construction
- Strategy Pattern: Pluggable algorithms
- Observer Pattern: Event-driven architecture
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.
- 4d ago First seen · 449 lines · 61 tokens per session scan A 39f31fb4d424
golang-pro is an agent published in the GitHub repository geoffjay/claude-plugins (8 stars, last pushed 10mo ago), licensed MIT. It adds 61 tokens to every session and 2,593 once invoked, about $0.0003 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 2026-08-31.
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