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API Design Principles · asymmetric-al | DecimalAI

codingby asymmetric-al

API Design Principles

asymmetric-al/api-design-principles

Source asymmetric-al/core ↗License AGPL-3.0

Master REST and GraphQL API design principles to build intuitive, scalable, and maintainable APIs that delight developers.

SkillScore77Maintained

Automatic

Coding pack

Last verified 8/20/2026

What it changes

Passed 17 of 22 test cases with the skill, and 14 of 22 without it.

Without skill64%

With skill77%

Checks it passed that the model alone missed

The validation error helper function sets the HTTP status code to 422
The resolver requests first + 1 records to check if a next page exists
The _links dictionary includes self, orders, update, and delete link objects

and 1 more in the full report

3 fixed14 passed either way5 still failing0 broke

Pass-rate lift: +14 pp
Tokens: +153%
Agent turns: 0%
Response time: -8%

Model gemini-3.6-flashMeasured 8/20/2026v1 · latest is v217 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

This benchmark measured an earlier version of the skill.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/asymmetric-al-api-design-principles/SKILL.md https://app.decimal.ai/s/asymmetric-al-api-design-principles/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add asymmetric-al-api-design-principles, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/asymmetric-al-api-design-principles/ and pins it in .decimal/skills.lock

decimalai skills add asymmetric-al-api-design-principles

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/asymmetric-al-api-design-principles/SKILL.md https://app.decimal.ai/s/asymmetric-al-api-design-principles/SKILL.md

Raw file: /s/asymmetric-al-api-design-principles/SKILL.md ↗ · machine-readable summary at /s/asymmetric-al-api-design-principles.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 3 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 3

Prompt

Our team needs a unified error handling pattern and versioning strategy for our REST service. Could you design a structured JSON error response schema along with reusable Python exception helper functions for input validation failures and missing resources, plus explain how to structure our endpoints to support future breaking changes gracefully?

What was checked, without and with the skill
Checked	Without skill	With skill
The validation error helper function sets the HTTP status code to 422	Missed	Passed
The error response schema includes top-level error, message, details, timestamp, and path fields	Missed	Passed

case-01 · gemini-3.6-flash · 8/20/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md537 lines5 files

API Design Principles

Master REST and GraphQL API design principles to build intuitive, scalable, and maintainable APIs that delight developers and stand the test of time.

When to Use This Skill

Designing new REST or GraphQL APIs
Refactoring existing APIs for better usability
Establishing API design standards for your team
Reviewing API specifications before implementation
Migrating between API paradigms (REST to GraphQL, etc.)
Creating developer-friendly API documentation
Optimizing APIs for specific use cases (mobile, third-party integrations)

Core Concepts

1. RESTful Design Principles

Resource-Oriented Architecture

Resources are nouns (users, orders, products), not verbs
Use HTTP methods for actions (GET, POST, PUT, PATCH, DELETE)
URLs represent resource hierarchies
Consistent naming conventions

HTTP Methods Semantics:

GET: Retrieve resources (idempotent, safe)
POST: Create new resources
PUT: Replace entire resource (idempotent)
PATCH: Partial resource updates
DELETE: Remove resources (idempotent)

2. GraphQL Design Principles

Schema-First Development

Types define your domain model
Queries for reading data
Mutations for modifying data

Track record

Benchmark

17 / 22

test cases passed, vs 14 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v5 — 10/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

asymmetric-al / core

.agents/skills/api-design-principles/SKILL.md

View on GitHub ↗

License AGPL-3.0Imported 10/3/2026Version v2Bundled 4 files

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See it in action

What's inside

API Design Principles

When to Use This Skill

Core Concepts

1. RESTful Design Principles

2. GraphQL Design Principles

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills