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doughnut: Skill for Claude Code

.agents/skills/backend/SKILL.md

backend is a skill for Claude Code from nerds-odd-e/doughnut. It costs 35 tokens per session (536 once invoked), scanned A, original, MIT.

A set of rules for the project's Java and Spring Boot backend, including controllers, services, tests, and database-related checks.

In plain words
What is it for?
Use it for general work in the Java backend, including Spring code, backend tests, and verification commands.
Why use it?
It gives backend work a consistent starting point and identifies when to use more specific production-code, testing, or migration guidance.

Skill for Claude Code

Written for Claude Code: paths in frontmatter. Also seen: installed under .agents/ (shared by several agents).

This is nerds-odd-e/doughnut's own configuration. It tells Claude Code how to work on doughnut 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 doughnut configures →

not rated 50repo changed 1mo ago A scan 35 tokens original MIT
View source ↗ nerds-odd-e/doughnut
Reuse

Borrowing it

Nothing to install: this file belongs to nerds-odd-e/doughnut. 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/nerds-odd-e/doughnut/main/.agents/skills/backend/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/nerds-odd-e/doughnut

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

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/nerds-odd-e/doughnut/backend"><img src="https://agentmods.dev/badge/skills/nerds-odd-e/doughnut/backend.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 536 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 $0.00035 $0.00536
Opus 5.5 $0.00014 $0.00214
Sonnet 5.5 $0.00007 $0.00107
Haiku 4.5 $0.00003 $0.00054

Measured 1mo ago against content hash f0e908856948, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

backend 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 1mo 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.

.agents/skills/backend/SKILL.md · 39 lines

How it starts

The opening of the file, as written. The whole thing — 39 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Backend

Java/Spring in backend/src/main/java/com/odde/donut/. Tests under backend/src/test/. Schema changes: db-migration skill.

Matching backend-code (production Java) and backend-testing (tests) skills attach via paths when those files are in context — do not fetch them up front.

Commands

CURSOR_DEV=true nix develop -c pnpm backend:test_only

When a database migration is involved:

CURSOR_DEV=true nix develop -c pnpm backend:verify

Always run all backend unit tests, not a selected file or test case.

Production

  • Controllers: return entities (or existing API body types). Narrow with @JsonIgnore / @JsonView. Introduce a response DTO only when the wire shape differs.
  • Top-of-file imports. No inline fully qualified class names except when two types share a simple name.
  • After Flyway schema changes, regenerate docs/database-erd.md with the database-erd skill (pnpm export:database-erd).
  • Note collections name their trash semantics. NoteRepository.findAllByNotebookIdOrderByIdAsc is the complete stored content, trash included (export, Git snapshots, learning-session title recognition); findAvailableNotesByNotebookIdOrderByIdAsc and the Note.JPA_AVAILABLE / NATIVE_AVAILABLE predicates select participating notes (search, recall, health rules); findOccupiedFolderIdsByNotebookId counts stored content for folder occupancy. On a loaded Note, isTrashed() follows current folder ancestry and isTrashedInDatabase() is the persisted membership as loaded. Root _trash membership is owned by Folder.isTrashed and the trashed_folder view; do not recreate the rule in callers.

Tests

Small-test style (unit-testing skill): prefer controller (HTTP-stable-boundary) tests; cover services/repos via realistic makeMe preconditions and the real DB (@Transactional). Test a service/algorithm directly only when it is an intentional domain-stable contract.

Mock only external services — OpenAIClient via OpenAiStructuredResponseMock. Ownership: notebookOwnedBy(user) so trackers inherit the owner. Group with @Nested.

Read the full file on GitHub · 39 lines

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. 1mo ago Changed · +1 lines f0e908856948
  2. 1mo ago First seen · 38 lines · 35 tokens per session scan A 4dffe340305e

Subscribe to this mod's changes

backend is a skill published in the GitHub repository nerds-odd-e/doughnut (50 stars, last pushed today), licensed MIT. It adds 35 tokens to every session and 536 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 2026-09-17.

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