A complete example of a Python REST API for managing books with Flask and SQLite. A REST API lets software use HTTP requests to create, read, update, and delete data, while SQLite stores that data in a local database file.

Use it as a starting point for a small book-collection service with filtering, CRUD endpoints, local storage, and tests.

It provides a concrete structure for request validation, JSON responses, error handling, health checks, database access, and unit tests instead of leaving those pieces unspecified.

rep1-failed — Skill for Claude Code and Codex by adrianco/retort

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 adrianco/retort --skill rep1-failed

Clone the repo

git clone --depth 1 https://github.com/adrianco/retort

Made for: Claude Code, Codex.

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/adrianco/retort/rep1-failed/github.svg)](https://agentmods.dev/skills/adrianco/retort/rep1-failed)

Your own site

<a href="https://agentmods.dev/skills/adrianco/retort/rep1-failed"><img src="https://agentmods.dev/badge/skills/adrianco/retort/rep1-failed/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/adrianco/retort/rep1-failed"><img src="https://agentmods.dev/badge/skills/adrianco/retort/rep1-failed.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 316 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. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

high Tool Misuse · line 20
Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).

Fix: Validate all tool parameters against an allowlist. Reject dangerous parameter values (shell=True, --force, -rf /) and use safe defaults.

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00000	$0.00316
Opus 5.5	$0.00000	$0.00126
Sonnet 5.5	$0.00000	$0.00063
Haiku 4.5	$0.00000	$0.00032

Measured 1mo ago against content hash c2cc1e3244ae, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

rep1-failed 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.

The scan reads SKILL.md. This mod also ships 2 executable files (app.py, tests.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

rep1 — 100% identical, 0 lines differ

experiments/adrianco/experiment-67-quant-6bit-knee/rest-api-crud/runs/agent=hermes-0205_language=python_model=mlxlocal/mlx-community--Qwen3-Coder-30B-A3B-Instruct-6bit_prompt=neutral_stack=q6/rep1-failed/SKILL.md · 56 lines

What it actually says

Book API Python REST Service Implementation

This skill implements a complete REST API service for managing a book collection in Python with Flask and SQLite database.

Features

Create, read, update, and delete books
Filter books by author
Health check endpoint
Input validation
JSON responses with appropriate HTTP status codes
SQLite database storage

Endpoints

POST /books - Create a new book (title, author, year, isbn)
GET /books - List all books (support ?author= filter)
GET /books/{id} - Get a single book by ID
PUT /books/{id} - Update a book
DELETE /books/{id} - Delete a book
GET /health - Health check

Implementation Details

The implementation uses:

Python 3.6+
Flask web framework
SQLite3 via built-in sqlite3 module
Embedded database in a local file (books.db)
HTTP handlers for all endpoints
Proper error handling and validation
Unit tests for all functionality

Usage

Install dependencies:
```
pip install -r requirements.txt
```
Run the application:
```
python app.py
```
The API will be available at http://localhost:8080

Testing

The implementation includes unit tests covering:

Health check endpoint
Book creation with validation
Book retrieval
Book updates
Book deletion
Error handling

Files

What ships with it

8 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.

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.

1mo ago First seen · 56 lines · 0 tokens per session scan A c2cc1e3244ae

Subscribe to this mod's changes

rep1-failed is a skill published in the GitHub repository adrianco/retort (210 stars, last pushed today), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 316 tokens. 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 2026-09-05.

Backend and APIs Databases

event-store-design

Design and implement event stores for event-sourced systems. Use when building event sourcing infrastructure, choosing event store technologies, or implementing event persistence patterns.

wshobson/agents · 33 tokens

convex-explain-app

Explain an existing Convex app — data model + relationships, public vs internal functions, auth/ownership model, components, a request→data flow — read from the schema and function surface. Read-only.

openclaw/clawhub · 47 tokens

platform-custom-field-generate

Use when users create, generate, or validate Salesforce Custom Field metadata. Trigger on custom fields, field types, Roll-Up Summary, Master-Detail/Lookup relationships, formula fields, picklists, dependent (controlling) picklists, referencing a value set from a field, or scoping picklist values per record type; also…

forcedotcom/sf-skills · 139 tokens

field-service-sobject-create-configure

Headless 360 REST API deployment step for creating sObject records. Handles describe-based field discovery, required-field derivation, entity-relationship ordering, and composite graph transactions. Use this skill when a designer skill (or a user directly) needs to create sObject records after design confirmation…

forcedotcom/sf-skills · 74 tokens

durable-objects

Build, debug, or review Cloudflare Durable Objects code for persistent state and coordination.

fcakyon/claude-codex-settings · 22 tokens

nornicdb-grpc

Drive NornicDB over gRPC — the Qdrant-compatible surface (Collections, Points, Snapshots) plus the additive NornicSearch service. Use when ingesting via Qdrant SDKs, migrating from Qdrant, or running hybrid text+vector search from a non-Bolt client. Covers connection, RPC catalog, collection→database mapping…

orneryd/NornicDB · 98 tokens