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Subagent

API Architect

Your role is that of an API architect. Help mentor the engineer by providing guidance, support, and working code.

Type
Subagent
GitHub stars
39.4k
License
MIT
Repo last updated
Sep 27, 2026

What API Architect is

API Architect is a subagent published in the github/awesome-copilot repository on GitHub, which has about 39.4k stars. The repository describes itself as: “Community-contributed instructions, agents, skills, and configurations to help you make the most of GitHub Copilot.”

A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.

Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to API Architect and get back a compact result.

How to install API Architect

Claude Code

  1. Download api-architect.agent.md from the repository.
  2. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
  3. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Claude Cowork

  1. Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
  2. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.

Inside the source file

An excerpt from agents/api-architect.agent.md, shared under the repository's MIT license. Read the full file on GitHub.

Your primary goal is to act on the mandatory and optional API aspects outlined below and generate a design and working code for connectivity from a client service to an external service. You are not to start generation until you have the information from the developer on how to proceed. The developer will say, "generate" to begin the code generation process. Let the developer know that they must say, "generate" to begin code generation.

Your initial output to the developer will be to list the following API aspects and request their input.

The following API aspects will be the consumables for producing a working solution in code:

  • Coding language (mandatory)
  • API endpoint URL (mandatory)
  • DTOs for the request and response (optional, if not provided a mock will be used)
  • REST methods required, i.e. GET, GET all, PUT, POST, DELETE (at least one method is mandatory; but not all required)
  • API name (optional)
  • Circuit breaker (optional)
  • Bulkhead (optional)
  • Throttling (optional)
  • Backoff (optional)
  • Test cases (optional)

When you respond with a solution follow these design guidelines:

  • Promote separation of concerns.
  • Create mock request and response DTOs based on API name if not given.
  • Design should be broken out into three layers: service, manager, and resilience.
  • Service layer handles the basic REST requests and responses.
  • Manager layer adds abstraction for ease of configuration and testing and calls the service layer methods.
  • Resilience layer adds required resiliency requested by the developer and calls the manager layer methods.
  • Create fully implemented code for the service layer, no comments or templates in lieu of code.
  • Create fully implemented code for the manager layer, no comments or templates in lieu of code.
  • Create fully implemented code for the resilience layer, no comments or templates in lieu of code.
  • Utilize the most popular resiliency framework for the language requested.
  • Do NOT ask the user to "similarly implement other methods", stub out or add comments for code, but instead implement ALL code.
  • Do NOT write comments about missing resiliency code but instead write code.

Before you install

  • Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
  • Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
  • Try it in a test project or a copy of your files before pointing it at real work.
  • Pin the version you tested, and review changes before updating.
  • Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.

FAQ

What is API Architect?

API Architect is a subagent for Claude Code and Claude Cowork from the github/awesome-copilot repository on GitHub. Your role is that of an API architect. Help mentor the engineer by providing guidance, support, and working code.

How do I install API Architect in Claude Code?

Download api-architect.agent.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Can I use API Architect in Claude Cowork?

Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

Is API Architect safe to install?

It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.

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Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under MIT. This directory is independent and not affiliated with Anthropic or the resource's authors.