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 makifbaysal/tasktrooper --skill backend-language-decisiongit clone --depth 1 https://github.com/makifbaysal/tasktrooperWrote 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/makifbaysal/tasktrooper/backend-language-decision)<a href="https://agentmods.dev/skills/makifbaysal/tasktrooper/backend-language-decision"><img src="https://agentmods.dev/badge/skills/makifbaysal/tasktrooper/backend-language-decision/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/makifbaysal/tasktrooper/backend-language-decision"><img src="https://agentmods.dev/badge/skills/makifbaysal/tasktrooper/backend-language-decision.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 | $0.00056 | $0.01014 |
| Opus 5.5 | $0.00022 | $0.00406 |
| Sonnet 5.5 | $0.00011 | $0.00203 |
| Haiku 4.5 | $0.00006 | $0.00101 |
Grade A, and why
backend-language-decision 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 today.
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 — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Backend Language Decision
Overview
You write Go, Java, C#/.NET, TypeScript on Node.js and Rust. The wrong choice is not a style preference — it fights the grain of the problem and the repository for the life of the code. Decide deliberately, at the start of the task, before writing anything.
Core principle: the repository's existing language wins by default. Only a greenfield service, or the analiz task's explicit direction, opens the choice.
The Decision
digraph decide {
"Repo or component already has a backend language?" [shape=diamond];
"Follow it" [shape=box];
"Analiz task names a language?" [shape=diamond];
"Use it" [shape=box];
"Team already runs a backend language elsewhere?" [shape=diamond];
"Prefer that one" [shape=box];
"Task shape?" [shape=diamond];
"Repo or component already has a backend language?" -> "Follow it" [label="yes"];
"Repo or component already has a backend language?" -> "Analiz task names a language?" [label="no / greenfield"];
"Analiz task names a language?" -> "Use it" [label="yes"];
"Analiz task names a language?" -> "Team already runs a backend language elsewhere?" [label="no"];
"Team already runs a backend language elsewhere?" -> "Prefer that one" [label="yes, and it fits"];
"Team already runs a backend language elsewhere?" -> "Task shape?" [label="no"];
}
How to tell what the repository is: the manifest (go.mod, pom.xml / build.gradle(.kts), *.csproj / *.sln / Directory.Build.props, package.json with a server dependency, Cargo.toml) and get_project_brief's stack for your component.
Task shape, for a greenfield service
| Shape | First choice | Why |
|---|---|---|
| High-QPS API, streaming, fan-out, background workers, small I/O-bound service | Go (Fiber, hexagonal) | simple concurrency, fast builds, small binaries |
| Rich domain: many entities, invariants, business rules, a JVM shop | Java (Quarkus first, Spring Boot when Quarkus does not fit) | mature OOP modelling and framework ecosystem |
| Rich domain in a Microsoft or Azure shop, or next to existing .NET services | C#/.NET (ASP.NET Core) | the same strengths as Java with the team's own platform |
| Thin API or BFF beside a TypeScript frontend, shared types with the client, a team that writes TypeScript | TypeScript on Node.js (Fastify; NestJS for a larger domain) | one language across the product |
| Latency- or memory-critical path, CPU-heavy processing, a component where a crash or a data race is unacceptable | Rust (axum on tokio) | predictable performance and memory safety, at a higher cost to write |
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.
- today First seen · 67 lines · 56 tokens per session scan A 212b250cfb61
backend-language-decision is a skill published in the GitHub repository makifbaysal/tasktrooper (116 stars, last pushed today), licensed Apache-2.0. It adds 56 tokens to every session and 1,014 once invoked, about $0.0002 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 2026-10-17.
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