What is Extension: Infrastructure?

A guide to implementing extensions for jobs, schemas, routing, assets, storage paths, site authentication, and configuration validation. A router maps incoming requests to the code that handles them.

Use it when adding background jobs, request routes, asset handling, storage locations, authentication, schemas, or configuration checks.

It explains the project’s expected patterns for common infrastructure tasks and checks.

Extension: Infrastructure — Skill for Claude Code by systempromptio

Install

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.

Any agent

npx skills add systempromptio/systemprompt-template --skill dev-ext-infrastructure

Clone the repo

git clone --depth 1 https://github.com/systempromptio/systemprompt-template

Made for: Claude Code.

Or install systemprompt-dev, the plugin that ships this one along with the rest of its 10 skills, 6 agents.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/systempromptio/systemprompt-template/dev-ext-infrastructure/github.svg)](https://agentmods.dev/skills/systempromptio/systemprompt-template/dev-ext-infrastructure)

Your own site

<a href="https://agentmods.dev/skills/systempromptio/systemprompt-template/dev-ext-infrastructure"><img src="https://agentmods.dev/badge/skills/systempromptio/systemprompt-template/dev-ext-infrastructure/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/systempromptio/systemprompt-template/dev-ext-infrastructure"><img src="https://agentmods.dev/badge/skills/systempromptio/systemprompt-template/dev-ext-infrastructure.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,123 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown No closer match found in the catalogue.

Token cost

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	$0.00024	$0.01123
Opus 5.5	$0.00010	$0.00449
Sonnet 5.5	$0.00005	$0.00225
Haiku 4.5	$0.00002	$0.00112

Measured 2mo ago against content hash efe28347d38e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Extension: Infrastructure 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 2mo 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.

storage/files/plugins/systemprompt-dev/skills/dev-ext-infrastructure/SKILL.md · 194 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Changes

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.

2mo ago First seen · 194 lines · 24 tokens per session scan A efe28347d38e

Subscribe to this mod's changes

Extension: Infrastructure is a skill published in the GitHub repository systempromptio/systemprompt-template (29 stars, last pushed 9d ago), with no licence file. It adds 24 tokens to every session and 1,123 once invoked, about $0.0001 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 2026-08-30.

Autonomous Agents Backend and APIs Rust a2a agent-orchestration ai-infrastructure claude

Extension: Infrastructure next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
Extension: Infrastructuresystempromptio/systemprompt-template	Skill	29	9d ago	none	A	24	Claude Code
mcp-builderHmbown/CodeWhale	Skill	41k	5d ago	MIT	A	30	Claude Code, Codex
rust-axum-servicemakifbaysal/tasktrooper	Skill	120	16d ago	Apache-2.0	A	57	Claude Code, Codex
go-add-entityJotJunior/cstk	Skill	24	yesterday	MIT	A	35	Claude Code
go-add-consumerJotJunior/cstk	Skill	24	yesterday	MIT	A	19	Claude Code
quiz-generationGetBindu/Bindu	Skill	10k	2mo ago	none	A	2	Claude Code, Codex
question-answeringGetBindu/Bindu	Skill	10k	2mo ago	none	A	3	Claude Code, Codex