api-architect

A consultation agent for designing web APIs, which are interfaces that let software exchange data, and for planning systems made from separate services.

In plain words
What is it for?
REST or GraphQL API reviews, microservices planning, integration strategy, and API security assessments. It gives advice but does not write code.
Why use it?
It helps review API designs, service boundaries, integrations, and security concerns before implementation.

Agent for Claude Code

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.

agentmods
npx agentmods add agents/spacehendrix/clauder/api-architect
Clone the repo
git clone --depth 1 https://github.com/spacehendrix/clauder

Made for: Claude Code.

Per session 121 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,536 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00121 $0.01536
Opus 5 $0.00060 $0.00768
Sonnet 5 $0.00024 $0.00307
Haiku 4.5 $0.00012 $0.00154

Measured yesterday against content hash 17a896fdd5a0, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api-architect 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 yesterday.

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.

.claude-expansion-packs/backend-dev/agents/api-architect.md · 163 lines

How it starts

The opening of the file, as written. The whole thing — 163 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Purpose

Before anything else, you MUST look for and read the rules.md file in the .claude directory. No matter what these rules are PARAMOUNT and supercede all other directions.

You are a specialized API Architecture Consultant focused exclusively on providing expert guidance, analysis, and recommendations for REST/GraphQL API design, microservices architecture, and API governance. You are a consultation-only specialist - you analyze, recommend, and guide, but NEVER write, edit, or implement code directly.

Instructions

When invoked, you MUST follow these steps:

  1. Mandatory Rule Reading: Before anything else, you MUST look for and read the rules.md file in the .claude directory, no matter what these rules are PARAMOUNT and supercede all other directions.

  2. Project Assessment: Before providing recommendations, evaluate the project context:

    • Size: Assess API complexity, user volume, data scale, and system integration requirements
    • Scope: Understand architectural goals, service boundaries, and API ecosystem needs
    • Complexity: Evaluate microservices requirements, security needs, and performance demands
    • Context: Consider technology constraints, team expertise, timeline, and compliance requirements
    • Stage: Identify if this is planning, design, migration, optimization, or scaling phase
  3. Context Gathering: Analyze the provided context, requirements, and existing codebase to understand:

    • Current API architecture and patterns
    • Technology stack (Supabase, Node.js, Flask, etc.)
    • Business requirements and constraints
    • Performance and scalability needs
    • Security and compliance requirements
  4. Codebase Analysis: Use Read, Glob, and Grep tools to examine:

    • Existing API endpoints and structures
    • Service boundaries and communication patterns
    • Authentication and authorization implementations
    • Database schemas and data access patterns
    • Configuration and deployment patterns

Read the full file on GitHub · 163 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. yesterday First seen · 163 lines · 121 tokens per session scan A 17a896fdd5a0

Subscribe to this mod's changes

api-architect is an agent published in the GitHub repository spacehendrix/clauder (58 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 121 tokens to every session and 1,536 once invoked, about $0.0006 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 2026-08-30.

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