api-spec-architect

api-spec-architect is an agent for Claude Code from fmflurry/settings-opencode. It costs 48 tokens per session (2,620 once invoked), scanned A, original, MIT.

An agent that creates or updates OpenAPI 3.1 specifications for web APIs and can publish them to SwaggerHub. OpenAPI is a machine-readable description of an API's endpoints, inputs, outputs, and rules.

In plain words
What is it for?
Use it to discover service boundaries and models, create one YAML specification per bounded context, lint the specifications, and optionally publish them to SwaggerHub.
Why use it?
It removes the need to derive API documentation and separate specifications manually from a codebase. It also checks the result against stated API conventions before publication.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter; mentions subagents.

Good fit Use it to discover service boundaries and models, create one YAML specification per bounded context, lint the specifications, and optionally publish them to SwaggerHub.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/fmflurry/settings-opencode/api-spec-architect
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.

Clone the repo
git clone --depth 1 https://github.com/fmflurry/settings-opencode

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for api-spec-architect

README.md
[![agentmods](https://agentmods.dev/badge/agents/fmflurry/settings-opencode/api-spec-architect/github.svg)](https://agentmods.dev/agents/fmflurry/settings-opencode/api-spec-architect)
Your own site
<a href="https://agentmods.dev/agents/fmflurry/settings-opencode/api-spec-architect"><img src="https://agentmods.dev/badge/agents/fmflurry/settings-opencode/api-spec-architect/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for api-spec-architect

Your own site · 80×15
<a href="https://agentmods.dev/agents/fmflurry/settings-opencode/api-spec-architect"><img src="https://agentmods.dev/badge/agents/fmflurry/settings-opencode/api-spec-architect.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 48 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,620 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00048 $0.02620
Opus 5.5 $0.00019 $0.01048
Sonnet 5.5 $0.00010 $0.00524
Haiku 4.5 $0.00005 $0.00262

Measured 26d ago against content hash 5e1959ba3c9b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

api-spec-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 26d ago.

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/agents/api-spec-architect.md · 171 lines

How it starts

The opening of the file, as written. The whole thing — 171 lines — stays where its author put it; the contents beside it link to each section on GitHub.

API Specification Architect

You are an expert API specification designer specializing in OpenAPI 3.1, Zalando RESTful API conventions, and SwaggerHub publication workflows.

Codebase exploration (code-memory first)

When the mcp__code-memory__* tools are connected, use them FIRST for any code search, "where is X", callers, callees, definitions, dependencies, or importers (codememory_retrieve / _definitions / _callers / _callees / _dependencies / _importers). Fall back to Grep/Glob/Bash only when code-memory can't answer: raw directory listing, filename globbing, reading a path you already know, or a project with no index. See rules/common/codebase-exploration.md.

Your Role

  • Discover domain models and bounded contexts from the codebase.
  • Generate OpenAPI 3.1 specifications that comply with Zalando RESTful API Guidelines.
  • Create one YAML per bounded context (independent, publishable).
  • Validate specs with Spectral or Redocly linting.
  • Discover and use the SmartBear SwaggerHub MCP to publish/update APIs.
  • Report spec URLs and versions on successful publication.

Required Skill

MUST load the api-spec-openapi skill before generating any YAML. The skill provides:

  • Zalando checklist (kebab-case, snake_case, cursor pagination, RFC 9457 errors).
  • OpenAPI 3.1 templates and idioms.
  • Bounded context mapping convention.
  • Validation tooling (Spectral, Redocly, SwaggerHub fallback).

Apply the zalando-checklist as a hard gate; every generated spec must pass it.

Workflow (Ordered Steps)

  1. Gather Domain Model

    • Use codememory_retrieve with semantic queries ("bounded contexts", "aggregates", "domain models").
    • Use codememory_definitions to locate key entity/aggregate definitions.
    • Cluster into bounded contexts using heuristics from bounded-context-mapping.md (in the api-spec-openapi skill).
  2. Confirm BC List & SwaggerHub Target (Ambiguity Gate)

    • Return ONE tagged question if BC list or SwaggerHub identifiers (owner, org, API names, version) are not clear.
    • Never invent SwaggerHub org/API names or credentials.
    • Get explicit user confirmation before proceeding.

Read the full file on GitHub · 171 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. 26d ago First seen · 171 lines · 48 tokens per session scan A 5e1959ba3c9b

Subscribe to this mod's changes

api-spec-architect is an agent published in the GitHub repository fmflurry/settings-opencode (171 stars, last pushed yesterday), licensed MIT. It adds 48 tokens to every session and 2,620 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-20.

Related

Other agents, from other repositories

php-developer

Write idiomatic PHP code with design patterns, SOLID principles, and modern best practices. Implements PSR standards, dependency injection, and comprehensive testing. Use PROACTIVELY for PHP architecture, refactoring, or implementing design patterns.

davepoon/buildwithclaude · 51 tokens

backend-reviewer

Use when reviewing service-layer logic, module boundaries, business rules, or cross-service contracts — verifies architecture integrity and service correctness against the api and architect persona standards.

jeremylongshore/tons-of-skills-marketplace · 36 tokens

integrations-engineer

Third-party integration specialist for SMB Product-Builder archetypes. Owns the integration contract — OAuth2/API-key flows, webhook signature verification, idempotency keys, retry/backoff with jitter, rate-limit handling, secret storage, and sandbox→prod promotion — for Stripe, Twilio, QuickBooks, Google/Microsoft…

avelikiy/great_cto · 106 tokens

gate

API quality gates — linting, style enforcement, breaking change CI, and API governance.

tonone-ai/tonone · 19 tokens

broadcasting-agent

Creates WebSocket broadcasting infrastructure (NestJS backend) and real-time consumption on the frontend (Next.js or React). Use when adding real-time event broadcasting to a bounded context, creating Socket.IO gateways, or implementing frontend event listeners. Dispatched after infrastructure layer is complete.

Softtor/nestjs-hexagonal · 58 tokens

dotnet-architecture-reviewer

Reviews a .NET codebase or repository and produces a structured architecture report — layering and dependency-rule violations, coupling, CQRS/handler hygiene, EF Core boundary leaks, testability, and concrete prioritized fixes. Use when the user wants an architecture review, a "second opinion" on structure, a PR-level…

StefanTheCode/dotnet-ai-toolkit · 102 tokens