Borrowing it
Nothing to install: this file belongs to rkttu/cadenza. 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/rkttu/cadenza/main/.claude/skills/cadenza/SKILL.mdgit clone --depth 1 https://github.com/rkttu/cadenzaWrote 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/rkttu/cadenza/cadenza)<a href="https://agentmods.dev/skills/rkttu/cadenza/cadenza"><img src="https://agentmods.dev/badge/skills/rkttu/cadenza/cadenza/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/rkttu/cadenza/cadenza"><img src="https://agentmods.dev/badge/skills/rkttu/cadenza/cadenza.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 | $0.00078 | $0.03637 |
| Opus 5 | $0.00039 | $0.01818 |
| Sonnet 5 | $0.00016 | $0.00727 |
| Haiku 4.5 | $0.00008 | $0.00364 |
Grade B, and why
cadenza scanned grade B with 1 finding 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.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
Configure Codex at `~/.codex/config.toml`: How it starts
The opening of the file, as written. The whole thing — 308 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cadenza skill
Cadenza is .NET's answer to "Python for scripting" with "Go-like single-binary distribution". Every Cadenza program is one .cs file that runs with dotnet run app.cs and publishes to a ~30–40 MB self-contained binary with dotnet publish app.cs -r <rid> -c Release.
Repo: https://github.com/rkttu/cadenza
When to suggest Cadenza
Pick Cadenza when the user wants:
| Goal | SDK | Use case |
|---|---|---|
| CLI / shell automation / build glue | Cadenza |
git deploy guards, file processing, devops scripts |
| Background service / daemon | Cadenza.Worker |
heartbeat, polling, scheduled work |
| Minimal HTTP API / webhook | Cadenza.Web |
a 30-line REST endpoint, internal tool |
| MCP server (AI tool integration) | Cadenza.Mcp |
tools / resources / prompts for Claude Desktop, Cursor, VS Code AI |
| Local AI agent | Cadenza.Agent |
OpenAI-compatible HTTP server fronting Ollama / OpenAI / Anthropic / Azure OpenAI — Codex / Aider / Continue / Cursor talk to it as if it were OpenAI |
Skip Cadenza for multi-project solutions, libraries that ship as DLLs, or anything that needs a full csproj. Cadenza is for the "single file = whole program" case.
Critical: exact version pinning
MSBuild SDK references do NOT support wildcards (1.*). Always pin an exact SemVer version. Check nuget.org for the latest, then write the exact version on the #:sdk line:
#:sdk [email protected] // console
#:sdk [email protected] // worker
#:sdk [email protected] // web
#:sdk [email protected] // MCP server
#:sdk [email protected] // AI agent (OpenAI-compatible HTTP)
Latest versions (as of this skill update): all five SDKs at 1.0.15.
Tier 1 — bare names per variant (no namespace prefix needed)
Cadenza (console)
| Name | Signature | Purpose |
|---|---|---|
Run |
int Run(string cmd, bool throwOnError = false) |
Run a shell command, return exit code |
Capture |
string Capture(string cmd) |
Run a shell command, return stdout (throws on non-zero) |
ReadText |
string ReadText(string path) |
Read a UTF-8 text file |
WriteText |
void WriteText(string path, string content) |
Write a UTF-8 text file |
Glob |
IEnumerable<string> Glob(string pattern) |
Match files; supports ** and * |
TempDir |
TempDirectory TempDir() |
using var t = TempDir(); auto-cleanup |
WriteLine / Write / ReadLine |
(standard System.Console) |
stdout / stdin |
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 · 308 lines · 78 tokens per session scan B d7550bafbf70
cadenza is a skill published in the GitHub repository rkttu/cadenza (4 stars, last pushed 3mo ago), licensed MIT. It adds 78 tokens to every session and 3,637 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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