Borrowing it
Nothing to install: this file belongs to adrian-d-hidalgo/nestjs-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/adrian-d-hidalgo/nestjs-mcp-server/main/CLAUDE.mdgit clone --depth 1 https://github.com/adrian-d-hidalgo/nestjs-mcp-serverWrote 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/instructions/adrian-d-hidalgo/nestjs-mcp-server/claude-md)<a href="https://agentmods.dev/instructions/adrian-d-hidalgo/nestjs-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/adrian-d-hidalgo/nestjs-mcp-server/claude-md/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/instructions/adrian-d-hidalgo/nestjs-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/adrian-d-hidalgo/nestjs-mcp-server/claude-md.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 | $0.01245 | $0.01245 |
| Opus 5 | $0.00622 | $0.00622 |
| Sonnet 5 | $0.00249 | $0.00249 |
| Haiku 4.5 | $0.00125 | $0.00125 |
Grade A, and why
nestjs-mcp-server CLAUDE.md 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 11d 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 — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.
@nestjs-mcp/server — Agent Instructions
Non-negotiable principles
- No autonomous git or destructive ops. Never run
git commit,git push,git reset --hard,git rebase, or publish without the user typing the exact command. "Finish the task" is not authorization. - No time estimates. Describe scope instead ("touches 3 resolvers", "requires an SDK type change").
- Honesty about coverage. Any claim without evidence is labeled
[Unverified]or[Inference]. Compiling is not executing; types verify code, not behavior. A fix grounded in[Inference]is not done — get the evidence or say you couldn't and stop. - Always check SDK types before defining new ones. This library wraps the MCP SDK v2 packages. Reuse SDK types (
CallToolResult,ServerContext,ToolAnnotations, etc.) from@modelcontextprotocol/server— re-export, never redeclare. - If in doubt, ask. A short question costs 30 seconds; a wrong-direction change costs an hour.
Commands
| Action | Command |
|---|---|
| Install | pnpm install |
| Build | pnpm build |
| Test | pnpm test |
| Single test | pnpm test -- path/to/file.spec.ts |
| E2E test | pnpm test:e2e |
| Lint + format + types | pnpm quality:check |
| Fix lint / format | pnpm quality:fix |
| Dead-code scan | pnpm knip |
| Run example | EXAMPLE=tools pnpm start:example |
| MCP Inspector | pnpm start:inspector |
Core patterns (no-lintable)
- Resolver classes must use
@Resolver()decorator, NOT@Injectable(). - Handler signature:
(params?, ctx: McpContext) => Result.McpContextextends the SDK'sServerContextwith the live Expressrequestand itsheaders. - Guard scopes:
- Global (
APP_GUARD): standard NestJSExecutionContext. - Method (
@UseGuards): customMcpExecutionContext; supports DI viaModuleRef.getRequest()returns the invoking request; there is nogetSessionId()— the protocol retired sessions in 2.0.
- Global (
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.
- 11d ago First seen · 99 lines · 1,245 tokens per session scan A 256d6b2acd0d
nestjs-mcp-server CLAUDE.md is an instructions file published in the GitHub repository adrian-d-hidalgo/nestjs-mcp-server (38 stars, last pushed 1mo ago), licensed MIT. It adds 1,245 tokens to every session, about $0.0062 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 2026-08-30.
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