api-designer

An agent for designing web APIs, which are interfaces that let software systems communicate. It covers REST, GraphQL, OpenAPI specifications, integrations, and API architecture.

In plain words
What is it for?
It is for designing REST or GraphQL APIs, writing OpenAPI specifications, planning integrations, and shaping API architecture.
Why use it?
It helps turn API requirements into a defined structure that other developers and systems can use consistently.

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/elasticdotventures/_b00t_/api-designer
Clone the repo
git clone --depth 1 https://github.com/elasticdotventures/_b00t_

Made for: Claude Code.

Per session 27 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,819 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00027 $0.02819
Opus 5 $0.00014 $0.01409
Sonnet 5 $0.00005 $0.00564
Haiku 4.5 $0.00003 $0.00282

Measured 2d ago against content hash c1dd2a270fe6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api-designer 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 2d 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-designer.md · 339 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 2d ago First seen · 339 lines · 27 tokens per session scan A c1dd2a270fe6

Subscribe to this mod's changes

api-designer is an agent published in the GitHub repository elasticdotventures/_b00t_ (14 stars, last pushed 2d ago), with no licence file. It adds 27 tokens to every session and 2,819 once invoked, about $0.0001 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.