ts-query-cqrs

ts-query-cqrs is a skill for Claude Code, Codex from llodev/skills. It costs 80 tokens per session (900 once invoked), scanned A, original, MIT.

A guide for building read-only queries in TypeScript code that separates reading data from changing it. CQRS, or Command Query Responsibility Segregation, is the practice of keeping these two jobs separate.

In plain words
What is it for?
Creating list and detail queries, defining API-facing projections, and handling pagination, filters, and aggregations.
Why use it?
It helps queries return only the data needed by a screen and keeps pagination, filters, and database access consistent.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Creating list and detail queries, defining API-facing projections, and handling pagination, filters, and aggregations.

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Install with agentmods
npx agentmods add skills/llodev/skills/ts-query-cqrs
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 llodev/skills --skill ts-query-cqrs
Clone the repo
git clone --depth 1 https://github.com/llodev/skills

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.

agentmods badge for ts-query-cqrs

README.md
[![agentmods](https://agentmods.dev/badge/skills/llodev/skills/ts-query-cqrs.svg)](https://agentmods.dev/skills/llodev/skills/ts-query-cqrs)
Your own site
<a href="https://agentmods.dev/skills/llodev/skills/ts-query-cqrs"><img src="https://agentmods.dev/badge/skills/llodev/skills/ts-query-cqrs.svg" alt="Measured on agentmods" height="20"></a>
Per session 80 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 900 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 $0.00080 $0.00900
Opus 5 $0.00040 $0.00450
Sonnet 5 $0.00016 $0.00180
Haiku 4.5 $0.00008 $0.00090

Measured 8d ago against content hash 1a29c21b76e6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

ts-query-cqrs 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.

The scan reads SKILL.md. This mod also ships 2 executable files (examples/find-many-items.query.ts, examples/in-memory-find-many-items.query.ts), 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.

skills/ts-query-cqrs/SKILL.md · 72 lines

How it starts

The opening of the file, as written. The whole thing — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.

TypeScript DDD Query (CQRS Read Side)

MANDATORY — READ ENTIRE FILE: Before any implementation step, read references/query-cqrs-pattern.md completely.

Then load the adapter reference for your infrastructure:

  • Prisma → also read references/prisma-adapter.md completely.
  • Other adapters (Firestore, MongoDB, Supabase…) → reference files not yet available; apply the principles from query-cqrs-pattern.md.

Do NOT load other DDD skills (entity, use-case, repository) unless explicitly requested.


Before You Start

Before defining a single interface, answer:

  • Read or write? If the caller needs the entity to run domain logic → Repository. If the caller only needs data to display → Query. When in doubt, check the table below.
  • Projection shape? What does the consumer actually need? Individual fields only — never return the full entity from a query.
  • Pagination? Does the list need page/pageSize? Use PaginatedResultDTO<XxxListItem>.
  • Filters? Map optional filters to conditional WHERE clauses in the adapter — never hard-code them.

Query vs Repository Decision Table

Situation Use Why
Display a list on the front-end Query Returns DTO, no entity overhead
Load entity before an update/delete Repository.findById Needs domain invariants (cloneWith)
Paginated list with filters Query Joins and selective projection are a read-side concern
Existence check before a write Repository.findById Returns entity or Result.fail — not a DTO
Dashboard / aggregated panel Query Reads across tables, no entity reconstruction needed
Custom domain lookup (findByEmail) that feeds a command Repository Caller needs an entity to modify

Read the full file on GitHub · 72 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. 8d ago First seen · 72 lines · 80 tokens per session scan A 1a29c21b76e6

Subscribe to this mod's changes

ts-query-cqrs is a skill published in the GitHub repository llodev/skills (2 stars, last pushed today), licensed MIT. It adds 80 tokens to every session and 900 once invoked, about $0.0004 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 2026-08-31.

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