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 aj-geddes/useful-ai-prompts --skill api-filtering-sortinggit clone --depth 1 https://github.com/aj-geddes/useful-ai-promptsWrote 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/aj-geddes/useful-ai-prompts/api-filtering-sorting)<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/api-filtering-sorting"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/api-filtering-sorting/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.
<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/api-filtering-sorting"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/api-filtering-sorting.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket warn
- Snyk 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 | $0.00039 | $0.00597 |
| Opus 5 | $0.00019 | $0.00298 |
| Sonnet 5 | $0.00008 | $0.00119 |
| Haiku 4.5 | $0.00004 | $0.00060 |
Grade A, and why
api-filtering-sorting 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 10d 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 — 105 lines — stays where its author put it; the contents beside it link to each section on GitHub.
API Filtering & Sorting
Table of Contents
Overview
Build flexible filtering and sorting systems that handle complex queries efficiently with proper validation, security, and performance optimization.
When to Use
- Building search and filter interfaces
- Implementing advanced query capabilities
- Creating flexible data retrieval endpoints
- Optimizing query performance
- Validating user input for queries
- Supporting complex filtering logic
Quick Start
Minimal working example:
// Node.js filtering implementation
app.get("/api/products", async (req, res) => {
const filters = {};
const sortOptions = {};
// Parse filtering parameters
const allowedFilters = [
"category",
"minPrice",
"maxPrice",
"inStock",
"rating",
];
for (const key of allowedFilters) {
if (req.query[key]) {
filters[key] = req.query[key];
}
}
// Build MongoDB query
const mongoQuery = {};
if (filters.category) {
mongoQuery.category = filters.category;
}
// ... (see reference guides for full implementation)
Reference Guides
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| Query Parameter Filtering | Query Parameter Filtering |
| Advanced Filter Parser | Advanced Filter Parser |
| Filter Builder Pattern | Filter Builder Pattern |
| Python Filtering (SQLAlchemy) | Python Filtering (SQLAlchemy) |
| Elasticsearch Filtering | Elasticsearch Filtering |
| Query Validation | Query Validation |
Best Practices
✅ DO
- Whitelist allowed filter fields
- Validate all input parameters
- Index fields used for filtering
- Support common operators
- Provide faceted navigation
- Cache filter options
- Limit filter complexity
- Document filter syntax
- Use database-native operators
- Optimize queries with indexes
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.
- references/advanced-filter-parser.md 2.3 KB
- references/elasticsearch-filtering.md 1.6 KB
- references/filter-builder-pattern.md 1.8 KB
- references/python-filtering-sqlalchemy.md 2.2 KB
- references/query-parameter-filtering.md 2.2 KB
- references/query-validation.md 692 B
- scripts/validate-schema.sh 426 B runs code
- templates/migration-template.sql 302 B
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.
- 10d ago First seen · 105 lines · 39 tokens per session scan A 6cfd9215c357
api-filtering-sorting is a skill published in the GitHub repository aj-geddes/useful-ai-prompts (336 stars, last pushed 6mo ago), licensed MIT. It adds 39 tokens to every session and 597 once invoked, about $0.0002 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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