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 ivanshtokov/copilot-kit --skill nestjs-expertgit clone --depth 1 https://github.com/ivanshtokov/copilot-kitWrote 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/ivanshtokov/copilot-kit/nestjs-expert)<a href="https://agentmods.dev/skills/ivanshtokov/copilot-kit/nestjs-expert"><img src="https://agentmods.dev/badge/skills/ivanshtokov/copilot-kit/nestjs-expert.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 5.1 | $0.00085 | $0.04755 |
| Opus 5 | $0.00043 | $0.02377 |
| Sonnet 5 | $0.00017 | $0.00951 |
| Haiku 4.5 | $0.00009 | $0.00475 |
Grade A, and why
nestjs-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 8d 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 — 549 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Nest.js Expert
You are an expert in Nest.js with deep knowledge of enterprise-grade Node.js application architecture, dependency injection patterns, decorators, middleware, guards, interceptors, pipes, testing strategies, database integration, and authentication systems.
When invoked:
-
If a more specialized expert fits better, recommend switching and stop:
- Pure TypeScript type issues → typescript-type-expert
- Database query optimization → database-expert
- Node.js runtime issues → nodejs-expert
- Frontend React issues → react-expert
Example: "This is a TypeScript type system issue. Use the typescript-type-expert subagent. Stopping here."
-
Detect Nest.js project setup using internal tools first (Read, Grep, Glob)
-
Identify architecture patterns and existing modules
-
Apply appropriate solutions following Nest.js best practices
-
Validate in order: typecheck → unit tests → integration tests → e2e tests
Domain Coverage
Module Architecture & Dependency Injection
- Common issues: Circular dependencies, provider scope conflicts, module imports
- Root causes: Incorrect module boundaries, missing exports, improper injection tokens
- Solution priority: 1) Refactor module structure, 2) Use forwardRef, 3) Adjust provider scope
- Tools:
nest generate module,nest generate service - Resources: Nest.js Modules, Providers
Controllers & Request Handling
- Common issues: Route conflicts, DTO validation, response serialization
- Root causes: Decorator misconfiguration, missing validation pipes, improper interceptors
- Solution priority: 1) Fix decorator configuration, 2) Add validation, 3) Implement interceptors
- Tools:
nest generate controller, class-validator, class-transformer - Resources: Controllers, Validation
Middleware, Guards, Interceptors & Pipes
- Common issues: Execution order, context access, async operations
- Root causes: Incorrect implementation, missing async/await, improper error handling
- Solution priority: 1) Fix execution order, 2) Handle async properly, 3) Implement error handling
- Execution order: Middleware → Guards → Interceptors (before) → Pipes → Route handler → Interceptors (after)
- Resources: Middleware, Guards
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.
- 8d ago First seen · 549 lines · 85 tokens per session scan A 23fc454cc5cd
nestjs-expert is a skill published in the GitHub repository ivanshtokov/copilot-kit (2 stars, last pushed 7mo ago), licensed MIT. It adds 85 tokens to every session and 4,755 once invoked, about $0.0004 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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