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 rrezartprebreza/spring-boot-skills --skill openapi-firstgit clone --depth 1 https://github.com/rrezartprebreza/spring-boot-skillsWrote 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/rrezartprebreza/spring-boot-skills/openapi-first)<a href="https://agentmods.dev/skills/rrezartprebreza/spring-boot-skills/openapi-first"><img src="https://agentmods.dev/badge/skills/rrezartprebreza/spring-boot-skills/openapi-first.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00055 | $0.01071 |
| Opus 5 | $0.00028 | $0.00535 |
| Sonnet 5 | $0.00011 | $0.00214 |
| Haiku 4.5 | $0.00006 | $0.00107 |
Grade A, and why
openapi-first scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 170 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OpenAPI-First Development
Maven Plugin Setup
<plugin>
<groupId>org.openapitools</groupId>
<artifactId>openapi-generator-maven-plugin</artifactId>
<version>7.5.0</version>
<executions>
<execution>
<goals><goal>generate</goal></goals>
<configuration>
<inputSpec>${project.basedir}/src/main/resources/openapi.yaml</inputSpec>
<generatorName>spring</generatorName>
<apiPackage>com.example.api</apiPackage>
<modelPackage>com.example.api.model</modelPackage>
<configOptions>
<delegatePattern>true</delegatePattern> <!-- implement delegate, not controller -->
<interfaceOnly>false</interfaceOnly>
<useSpringBoot3>true</useSpringBoot3>
<useTags>true</useTags>
<dateLibrary>java8</dateLibrary>
<serializationLibrary>jackson</serializationLibrary>
<openApiNullable>false</openApiNullable>
<skipDefaultInterface>true</skipDefaultInterface>
</configOptions>
<generateSupportingFiles>true</generateSupportingFiles>
<output>${project.build.directory}/generated-sources/openapi</output>
</configuration>
</execution>
</executions>
</plugin>
OpenAPI Spec Example
# src/main/resources/openapi.yaml
openapi: 3.0.3
info:
title: Order Service API
version: 1.0.0
paths:
/api/v1/orders:
post:
tags: [Orders]
operationId: createOrder
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/CreateOrderRequest'
responses:
'201':
description: Order created
content:
application/json:
schema:
$ref: '#/components/schemas/OrderResponse'
'400':
$ref: '#/components/responses/ValidationError'
get:
tags: [Orders]
operationId: listOrders
parameters:
- name: page
in: query
schema: { type: integer, default: 0 }
- name: size
in: query
schema: { type: integer, default: 20 }
responses:
'200':
description: Paginated orders
content:
application/json:
schema:
$ref: '#/components/schemas/OrderPage'
components:
schemas:
CreateOrderRequest:
type: object
required: [customerEmail, items]
properties:
customerEmail:
type: string
format: email
items:
type: array
minItems: 1
items:
$ref: '#/components/schemas/OrderItemRequest'
OrderResponse:
type: object
properties:
id:
type: string
format: uuid
status:
type: string
enum: [PENDING, PROCESSING, SHIPPED, DELIVERED, CANCELLED]
customerEmail:
type: string
createdAt:
type: string
format: date-time
responses:
ValidationError:
description: Validation failed
content:
application/json:
schema:
$ref: '#/components/schemas/ApiError'
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 8d ago First seen · 170 lines · 55 tokens per session scan A 7cc62c921363
openapi-first is a skill published in the GitHub repository rrezartprebreza/spring-boot-skills (258 stars, last pushed 24d ago), licensed MIT. It adds 55 tokens to every session and 1,071 once invoked, about $0.0003 per session on Opus 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.
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