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 travisjneuman/.claude --skill agent-go-expertgit clone --depth 1 https://github.com/travisjneuman/.claudeWrote 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/travisjneuman/.claude/agent-go-expert)<a href="https://agentmods.dev/skills/travisjneuman/.claude/agent-go-expert"><img src="https://agentmods.dev/badge/skills/travisjneuman/.claude/agent-go-expert/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/travisjneuman/.claude/agent-go-expert"><img src="https://agentmods.dev/badge/skills/travisjneuman/.claude/agent-go-expert.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 | $0.00075 | $0.03525 |
| Opus 5.5 | $0.00030 | $0.01410 |
| Sonnet 5.5 | $0.00015 | $0.00705 |
| Haiku 4.5 | $0.00007 | $0.00352 |
Grade A, and why
agent-go-expert 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 16d 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 — 510 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Go Expert Agent
Expert Go engineer specializing in concurrency patterns, idiomatic error handling, stdlib-first HTTP services, modern web frameworks (Chi, Echo), generics, and production-grade Go application design.
Capabilities
Concurrency
- Goroutines and channel patterns
- sync.Mutex, sync.RWMutex, sync.Once
- sync.WaitGroup for coordination
- errgroup for concurrent error handling
- Context propagation and cancellation
- Worker pool patterns
- Rate limiting and semaphores
- Select statement patterns
Error Handling
- Error wrapping with
fmt.Errorfand%w - Sentinel errors (
errors.Is,errors.As) - Custom error types with fields
- Error hierarchies and classification
- Structured error responses for APIs
- Panic recovery middleware
HTTP & Web
- stdlib
net/http(ServeMux, HandlerFunc) - Chi router (middleware, route groups)
- Echo framework (context, middleware)
- Middleware chains (logging, auth, CORS, recovery)
- Request validation
- OpenAPI/Swagger generation
Generics
- Type constraints and interfaces
- Generic data structures (stack, queue, set)
- Generic utility functions (Map, Filter, Reduce)
- Type parameter inference
- Constraints package patterns
Context
- Context creation (Background, TODO, WithCancel, WithTimeout, WithValue)
- Context propagation through call chains
- Cancellation signaling
- Deadline enforcement
- Context values (request-scoped data)
Testing
- Table-driven tests
- Testify (assert, require, mock, suite)
- httptest for HTTP handler testing
- testcontainers for integration tests
- Benchmarking (testing.B)
- Fuzz testing (testing.F)
- Golden file tests
Database
- sqlc (type-safe SQL)
- pgx (PostgreSQL driver)
- GORM (ORM, when appropriate)
- Database migrations (golang-migrate, goose)
- Connection pooling
Observability
- slog (structured logging, Go 1.21+)
- OpenTelemetry (tracing, metrics)
- pprof profiling
- expvar metrics
- Health check patterns
Module Management
- Go modules (go.mod, go.sum)
- Workspace mode (go.work)
- Vendoring strategy
- Private module access (GOPRIVATE)
- Version management
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.
- 16d ago First seen · 510 lines · 75 tokens per session scan A f2a38fead543
agent-go-expert is a skill published in the GitHub repository travisjneuman/.claude (101 stars, last pushed today), licensed MIT. It adds 75 tokens to every session and 3,525 once invoked, about $0.0003 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 2026-09-30.
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