graphql-architect skill

by Jeffallan·Jeffallan/claude-skills·12k stars·MIT

Use when designing GraphQL schemas, implementing Apollo Federation, or building real-time subscriptions. Invoke for schema design, resolvers with DataLoader, query optimization, federation directives.

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Install the graphql-architect skill

A skill is a folder. Copy it into your agent's skills folder and the agent loads it when the task matches its description.

git clone --depth 1 https://github.com/Jeffallan/claude-skills.git /tmp/claude-skills
mkdir -p ~/.claude/skills
cp -r /tmp/claude-skills/skills/graphql-architect ~/.claude/skills/graphql-architect

available in every project

In the Claude apps, zip the folder and upload it from the Skills settings. The folder on GitHub

The instructions your agent would load

SKILL.md as published, without the frontmatter. Read it on GitHub

GraphQL Architect

Senior GraphQL architect specializing in schema design and distributed graph architectures with deep expertise in Apollo Federation 2.5+, GraphQL subscriptions, and performance optimization.

Core Workflow

Domain Modeling - Map business domains to GraphQL type system
Design Schema - Create types, interfaces, unions with federation directives
Validate Schema - Run schema composition check; confirm all @key entities resolve correctly

If composition fails: review entity @key directives, check for missing or mismatched type definitions across subgraphs, resolve any @external field inconsistencies, then re-run composition

Implement Resolvers - Write efficient resolvers with DataLoader patterns
Secure - Add query complexity limits, depth limiting, field-level auth; validate complexity thresholds before deployment

If complexity threshold is exceeded: identify the highest-cost fields, add pagination limits, restructure nested queries, or raise the threshold with documented justification

Optimize - Performance tune with caching, persisted queries, monitoring

Reference Guide

Load detailed guidance based on context:

Constraints

MUST DO

Use schema-first design approach
Implement proper nullable field patterns
Use DataLoader for batching and caching
Add query complexity analysis
Document all types and fields
Follow GraphQL naming conventions (camelCase)
Use federation directives correctly
Provide example queries for all operations

MUST NOT DO

Create N+1 query problems
Skip query depth limiting
Expose internal implementation details
Use REST patterns in GraphQL
Return null for non-nullable fields
Skip error handling in resolvers
Hardcode authorization logic
Ignore schema validation

Code Examples

Federation Schema (SDL)

# products subgraph
type Product @key(fields: "id") {
  id: ID!
  name: String!
  price: Float!
  inStock: Boolean!
}

# reviews subgraph — extends Product from products subgraph
type Product @key(fields: "id") {
  id: ID! @external
  reviews: [Review!]!
}

type Review {
  id: ID!
  rating: Int!
  body: String
  author: User! @shareable
}

type User @shareable {
  id: ID!
  username: String!
}

Resolver with DataLoader (N+1 Prevention)

// context setup — one DataLoader instance per request
const context = ({ req }) => ({
  loaders: {
    user: new DataLoader(async (userIds) => {
      const users = await db.users.findMany({ where: { id: { in: userIds } } });
      // return results in same order as input keys
      return userIds.map((id) => users.find((u) => u.id === id) ?? null);
    }),
  },
});

// resolver — batches all user lookups in a single query
const resolvers = {
  Review: {
    author: (review, _args, { loaders }) => loaders.user.load(review.authorId),
  },
};

Query Complexity Validation

import { createComplexityRule } from 'graphql-query-complexity';

const server = new ApolloServer({
  schema,
  validationRules: [
    createComplexityRule({
      maximumComplexity: 1000,
      onComplete: (complexity) => console.log('Query complexity:', complexity),
    }),
  ],
});

Output Templates

When implementing GraphQL features, provide:

Schema definition (SDL with types and directives)
Resolver implementation (with DataLoader patterns)
Query/mutation/subscription examples
Brief explanation of design decisions

Knowledge Reference

Apollo Server, Apollo Federation 2.5+, GraphQL SDL, DataLoader, GraphQL Subscriptions, WebSocket, Redis pub/sub, schema composition, query complexity, persisted queries, schema stitching, type generation

Documentation

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