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spekka: Skill for Claude Code

.claude/skills/spekka-backend-api/SKILL.md

Backend API is a skill for Claude Code from johnreitano/spekka. It costs 24 tokens per session (268 once invoked), scanned A, original, MIT.

A set of guidelines for designing backend APIs, the interfaces that let software systems exchange data and actions.

In plain words
What is it for?
Use it when creating or changing REST APIs, including resource endpoints, nested data, query parameters, HTTP responses, and rate-limit headers.
Why use it?
It gives developers consistent rules for URLs, versioning, filtering, pagination, errors, and rate limits so clients can use the API predictably.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: mentions Claude Code.

This is johnreitano/spekka's own configuration. It tells Claude Code how to work on spekka itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything spekka configures →

not rated 5repo 9mo ago A scan 24 tokens original MIT
View source ↗ johnreitano/spekka
Reuse

Borrowing it

Nothing to install: this file belongs to johnreitano/spekka. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/johnreitano/spekka/main/.claude/skills/spekka-backend-api/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/johnreitano/spekka

Made for: Claude Code.

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.

agentmods badge for Backend API

README.md
[![agentmods](https://agentmods.dev/badge/skills/johnreitano/spekka/spekka-backend-api/github.svg)](https://agentmods.dev/skills/johnreitano/spekka/spekka-backend-api)
Your own site
<a href="https://agentmods.dev/skills/johnreitano/spekka/spekka-backend-api"><img src="https://agentmods.dev/badge/skills/johnreitano/spekka/spekka-backend-api/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.

agentmods 80×15 button for Backend API

Your own site · 80×15
<a href="https://agentmods.dev/skills/johnreitano/spekka/spekka-backend-api"><img src="https://agentmods.dev/badge/skills/johnreitano/spekka/spekka-backend-api.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 268 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 original 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00024 $0.00268
Opus 5.5 $0.00010 $0.00107
Sonnet 5.5 $0.00005 $0.00054
Haiku 4.5 $0.00002 $0.00027

Measured 2mo ago against content hash 986c72f19bfe, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Backend API 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.

.claude/skills/spekka-backend-api/SKILL.md · 20 lines

What it actually says

Backend API

This Skill provides Claude Code with specific guidance on how it should handle backend API.

Instructions

  • RESTful Design: Follow REST principles with clear resource-based URLs and appropriate HTTP methods (GET, POST, PUT, PATCH, DELETE)
  • Consistent Naming: Use consistent, lowercase, hyphenated or underscored naming conventions for endpoints across the API
  • Versioning: Implement API versioning strategy (URL path or headers) to manage breaking changes without disrupting existing clients
  • Plural Nouns: Use plural nouns for resource endpoints (e.g., /users, /products) for consistency
  • Nested Resources: Limit nesting depth to 2-3 levels maximum to keep URLs readable and maintainable
  • Query Parameters: Use query parameters for filtering, sorting, pagination, and search rather than creating separate endpoints
  • HTTP Status Codes: Return appropriate, consistent HTTP status codes that accurately reflect the response (200, 201, 400, 404, 500, etc.)
  • Rate Limiting Headers: Include rate limit information in response headers to help clients manage their usage
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.

  1. 2mo ago First seen · 20 lines · 24 tokens per session scan A 986c72f19bfe

Subscribe to this mod's changes

Backend API is a skill published in the GitHub repository johnreitano/spekka (5 stars, last pushed 9mo ago), licensed MIT. It adds 24 tokens to every session and 268 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 2026-08-31.

Backend and APIs
Related

Backend API compared with skills from other repositories

Backend API next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
Backend APIjohnreitano/spekkaSkill59mo agoMITA24Claude Code
mem0-oss-to-platformmem0ai/mem0Skill68k2d agoApache-2.0A217Claude Code, Codex
azure-mgmt-botservice-dotnetmicrosoft/skillsSkill3.2kyesterdayMITA78Claude Code
fastapi-router-pymicrosoft/skillsSkill3.2kyesterdayMITA46Claude Code
dev-runtimelangwatch/langwatchSkill5.0kyesterdayApache-2.0A172Claude Code
api-designericrisco/rsc-harnessSkill5032d agoMITA105Claude Code, Codex
migrate-segw-to-raparc-mcp/arc-1Skill252yesterdayMITA106Claude Code