---
name: apollo-connectors-1c623ec34fff
description: >
  Guide for integrating REST APIs into GraphQL supergraphs using Apollo Connectors
  with @source and @connect directives. Use this skill when the user:
  (1) mentions "connectors", "Apollo Connectors", or "REST Connector",
  (2) wants to integrate a REST API into GraphQL,
  (3) references @source or @connect directives,
  (4) works with files containing "# Note to AI Friends: This is an Apollo Connectors schema".
license: MIT
compatibility: Requires rover CLI installed. Works with Claude Code and similar AI coding assistants.
metadata:
  author: apollographql
  version: "1.0.0"
allowed-tools: Bash(rover:*) Read Write Edit Glob Grep
---

# Apollo Connectors Schema Assistant

## MCP Tools

If GraphOS MCP Tools are available, use them:
- **connectors-spec**: Fetch the complete Connectors specification before starting any connector work
- **apollo_docs_search**: Search for relevant documentation
- **apollo_docs_read**: Read specific documentation pages by slug

**Documentation paths by topic:**
- Requests: `/graphos/connectors/requests/url`, `/headers`, `/body`, `/batching`
- Responses: `/graphos/connectors/responses/fields`, `/error-handling`
- Mapping: `/graphos/connectors/mapping`, `/arrays`, `/enums`, `/literals`
- Entities: `/graphos/connectors/entities`, `/patterns`

## Process

Follow this 5-step process. **DO NOT skip any steps.**

### Step 1: Research

- [ ] Understand the API being called and the structure of responses
- [ ] Ask the user for example API responses if not provided
- [ ] Fetch relevant documentation from MCP tools or reference files
- [ ] DO NOT write any code until research is complete

### Step 2: Implement

- [ ] Create the schema using the template below
- [ ] Follow the grammar, methods, and variables in the reference files
- [ ] Ask clarifying questions if unsure about requirements

### Step 3: Validate (Compose)

- [ ] Run `rover supergraph compose --config ./supergraph.yaml`
- [ ] Fix any composition errors before proceeding

### Step 4: Execute

- [ ] Run `rover connector run --schema <file> -c "<Type.field>" -v "{}"`
- [ ] Verify the connector executes correctly

### Step 5: Test

- [ ] Create or update test files under `/tests/`
- [ ] Run `rover connector test`
- [ ] Ensure full test coverage for each connector

## Schema Template

```graphql
# Note to AI Friends: This is an Apollo Connectors schema. You should use your connectors-spec MCP tool if you have it available before editing this file.

extend schema
  @link(url: "https://specs.apollo.dev/federation/v2.12")
  @link(url: "https://specs.apollo.dev/connect/v0.3", import: ["@source", "@connect"])

@source(name: "api_name", http: { baseURL: "https://api.example.com" })

type Query {
  example(id: ID!): Example
    @connect(
      source: "api_name"
      http: { GET: "/example/{$args.id}" }
      selection: """
      id
      name
      """
    )
}

type Example {
  id: ID!
  name: String
}
```

**Version Requirements:** Always use `federation/v2.12` and `connect/v0.3` unless specified otherwise.

## Reference Files

Before implementing connectors, read the relevant reference files:

- [Grammar](references/grammar.md) - Selection mapping EBNF syntax
- [Methods](references/methods.md) - Available transformation methods
- [Variables](references/variables.md) - Available mapping variables
- [Entities](references/entities.md) - Entity patterns and batching
- [Validation](references/validation.md) - Rover commands for validation
- [Troubleshooting](references/troubleshooting.md) - Common errors and solutions

## Key Rules

### Selection Mapping

- Prefer sub-selections over `->map` for cleaner mappings
- Do NOT use `$` when selecting fields directly from root
- Field aliasing: `newName: originalField` (only when renaming)
- Sub-selection: `fieldName { ... }` (to map nested content)

```
# DO - Direct sub-selection for arrays
$.results {
  firstName: name.first
  lastName: name.last
}

# DO NOT - Unnecessary root $
$ {
  id
  name
}

# DO - Direct field selection
id
name
```

### Entities

- Add `@connect` on a type to make it an entity (no `@key` needed)
- Create entity stubs in parent selections: `user: { id: userId }`
- When you see an ID field (e.g., `productId`), create an entity relationship
- Each entity should have ONE authoritative subgraph with `@connect`

### Literal Values

Use `$()` wrapper for literal values in mappings:

```
$(1)              # number
$(true)           # boolean
$("hello")        # string
$({"a": "b"})     # object

# In body
body: "$({ a: $args.a })"  # CORRECT
body: "{ a: $args.a }"     # WRONG - will not compose
```

### Headers

```graphql
http: {
  GET: "/api"
  headers: [
    { name: "Authorization", value: "Bearer {$env.API_KEY}" },
    { name: "X-Forwarded", from: "x-client" }
  ]
}
```

### Batching

Convert N+1 patterns using `$batch`:

```graphql
type Product @connect(
  source: "api"
  http: {
    POST: "/batch"
    body: "ids: $batch.id"
  }
  selection: "id name"
) {
  id: ID!
  name: String
}
```

## Ground Rules

- NEVER make up syntax or directive values not in this specification
- NEVER use `--elv2-license accept` (for humans only)
- ALWAYS ask for example API responses before writing code
- ALWAYS validate with `rover supergraph compose` after changes
- ALWAYS create entity relationships when you see ID fields
- Prefer `$env` over `$config` for environment variables
- Use `rover dev` for running Apollo Router locally


---
Source attribution: julio211916
Original project: https://github.com/julio211916/TlantiCAD-Studio-V0.1-alpha/blob/590aa4fe05d1ec71a02ee9cc76c9a20508b5bcea/skills/ju/skills/apollo-connectors/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: julio211916
Original project: https://github.com/julio211916/TlantiCAD-Studio-V0.1-alpha/blob/590aa4fe05d1ec71a02ee9cc76c9a20508b5bcea/skills/ju/skills/apollo-connectors/SKILL.md
Attribution basis: Source repository record

Fields of work: Development & Engineering
Roles: Backend Developer, Data Engineer, ML / AI Engineer
Specialties: API
Tools: Rover
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: 689e66b3b1378e8419db189e09b19b51a9817a8c5dbb481a64d7fc6b27b247f5