cqrs-implementation

Implement Command Query Responsibility Segregation for scalable architectures. Use when separating read and write models, optimizing query performance, or building event-sourced systems.

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npx tessl i github:wshobson/agents --skill cqrs-implementation

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Overall
score

73%

Review — 70%

Does it follow best practices?

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Evaluation — 88%

↑ 1.54x

Agent success when using this skill

Validation — 12 / 16 Passed

Validation for skill structure

SKILL.md

Review

Evals

Evaluation results

88%

44%

Inventory Management Service

Command/Query bus infrastructure

Criteria

Without context

With context

Command base dataclass

50%

Auto-generated command_id

50%

Auto-generated timestamp

50%

CommandHandler ABC Generic

100%

CommandBus register/dispatch

50%

100%

CommandBus ValueError

100%

QueryHandler ABC Generic

100%

QueryBus register/dispatch

50%

100%

QueryBus ValueError

100%

Async handlers

100%

Separate command and query models

100%

Validation in command handler

100%

No reads in command handlers

100%

Without context: $1.0944 · 3m 44s · 38 turns · 87 in / 15,254 out tokens

With context: $1.1663 · 3m 58s · 36 turns · 332 in / 15,381 out tokens

81%

20%

Blog Platform Analytics Read Model

Read model synchronization and projection

Criteria

Without context

With context

Denormalized view records

100%

Projection handles() method

100%

Projection apply() is async

Projection clear() method

63%

Per-projection checkpoints

100%

Sync reads from checkpoint

100%

Checkpoint updated after events

100%

run() uses asyncio.sleep loop

rebuild_projection clears first

56%

100%

rebuild_projection resets checkpoint

100%

rebuild_projection replays all

100%

Event types have global_position

40%

100%

Without context: $0.3948 · 1m 52s · 16 turns · 17 in / 5,696 out tokens

With context: $1.2576 · 4m 14s · 39 turns · 101 in / 16,332 out tokens

94%

29%

Task Management REST API

FastAPI integration, pagination, eventual consistency

Criteria

Without context

With context

POST for create command

100%

PUT for update command

100%

GET for single query

100%

GET for list query

100%

CommandBus via Depends

100%

QueryBus via Depends

100%

PaginatedResult items field

100%

PaginatedResult total field

100%

PaginatedResult page fields

100%

PaginatedResult total_pages

63%

Consistency handler timeout

100%

Stale data warning

56%

67%

Buses stored on app.state

100%

Without context: $0.5967 · 2m 23s · 25 turns · 25 in / 8,474 out tokens

With context: $1.3585 · 4m 36s · 45 turns · 76 in / 16,153 out tokens

Evaluated: about 4 hours ago
Agent: Claude Code

Table of Contents

Inventory Management Service Blog Platform Analytics Read Model Task Management REST API

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