api-designer

api-designer is an agent for Claude Code from Indium-AI-Labs/indium-agentkit. It costs 76 tokens per session (1,977 once invoked), scanned A, original, no licence file.

A tool for turning written requirements into typed descriptions of how an application’s interfaces should work. It does not change the application’s code.

In plain words
What is it for?
Use it to draft API contracts from product or technical requirements and define expected inputs, outputs, and types.
Why use it?
It helps clarify the data and operations an interface must support before implementation begins, reducing misunderstandings between requirements and code.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it to draft API contracts from product or technical requirements and define expected inputs, outputs, and types.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/indium-ai-labs/indium-agentkit/api-designer
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/Indium-AI-Labs/indium-agentkit

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-designer

README.md
[![agentmods](https://agentmods.dev/badge/agents/indium-ai-labs/indium-agentkit/api-designer/github.svg)](https://agentmods.dev/agents/indium-ai-labs/indium-agentkit/api-designer)
Your own site
<a href="https://agentmods.dev/agents/indium-ai-labs/indium-agentkit/api-designer"><img src="https://agentmods.dev/badge/agents/indium-ai-labs/indium-agentkit/api-designer/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-designer

Your own site · 80×15
<a href="https://agentmods.dev/agents/indium-ai-labs/indium-agentkit/api-designer"><img src="https://agentmods.dev/badge/agents/indium-ai-labs/indium-agentkit/api-designer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 76 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,977 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 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 5.1 $0.00076 $0.01977
Opus 5.5 $0.00030 $0.00791
Sonnet 5.5 $0.00015 $0.00395
Haiku 4.5 $0.00008 $0.00198

Measured 13d ago against content hash 85ce04881108, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 13d 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.

agents/api-designer.md · 185 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. 13d ago Changed · -68 lines · +62 tokens per session 85ce04881108
  2. 2mo ago First seen · 253 lines · 14 tokens per session scan A d80f9c8ff773

Subscribe to this mod's changes

api-designer is an agent published in the GitHub repository Indium-AI-Labs/indium-agentkit (17 stars, last pushed 13d ago), with no licence file. It adds 76 tokens to every session and 1,977 once invoked, about $0.0003 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 2026-08-31.

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