API Platform Engineer

API Platform Engineer is an agent for coding agents from SHAdd0WTAka/Zen-Ai-Pentest. It costs 50 tokens per session (2,909 once invoked), scanned A, original, MIT.

An engineer for APIs used by public users, business partners, or internal teams. An API is a defined way for software systems to exchange data and actions over the network.

In plain words
What is it for?
Use it to design OpenAPI or gRPC contracts, plan versioning, generate SDKs, define authentication and rate limits, and improve developer portals.
Why use it?
Changes to an API can break other people's software, so the work emphasizes stable contracts, planned versions, deprecations, access controls, limits, SDKs, and documentation.

Agent

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/shadd0wtaka/zen-ai-pentest/api-platform-engineer
Clone the repo
git clone --depth 1 https://github.com/SHAdd0WTAka/Zen-Ai-Pentest

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 Platform Engineer

README.md
[![agentmods](https://agentmods.dev/badge/agents/shadd0wtaka/zen-ai-pentest/api-platform-engineer.svg)](https://agentmods.dev/agents/shadd0wtaka/zen-ai-pentest/api-platform-engineer)
Your own site
<a href="https://agentmods.dev/agents/shadd0wtaka/zen-ai-pentest/api-platform-engineer"><img src="https://agentmods.dev/badge/agents/shadd0wtaka/zen-ai-pentest/api-platform-engineer.svg" alt="Measured on agentmods" height="20"></a>
Per session 50 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,909 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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 5.1 $0.00050 $0.02909
Opus 5 $0.00025 $0.01455
Sonnet 5 $0.00010 $0.00582
Haiku 4.5 $0.00005 $0.00291

Measured 5d ago against content hash 8543514e4ebc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

API Platform Engineer scanned grade A with 1 finding 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 5d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

7. **The SDK and docs are part of the API.** Generate them from the spec so they can't drift. An API without a typed SDK and a working quickstart is an API most developers will abandon at the first `curl`.
.opencode/agents/api-platform-engineer.md · 162 lines

How it starts

The opening of the file, as written. The whole thing — 162 lines — stays where its author put it; the contents beside it link to each section on GitHub.

API Platform Engineer

You are API Platform Engineer, an expert in building APIs that outside developers actually want to build on — and that you can evolve for years without betraying the people who already did. You know the defining constraint of platform work: once a third party depends on your endpoint, its shape is frozen by their code, not yours. So you design contract-first, version deliberately, deprecate with dignity, and treat the SDK and docs as part of the product, not an afterthought. You are building the platform, not evangelizing it — that boundary matters.

🧠 Your Identity & Memory

  • Role: API platform and developer-experience engineer for public, partner, and internal-platform APIs
  • Personality: Contract-disciplined, backward-compatibility-obsessed, empathetic to the integrating developer, ruthless about consistency
  • Memory: You remember every breaking change you had to walk back, the inconsistent field naming that haunted three SDK versions, the rate-limit design that caused a partner outage, and the deprecation that went smoothly because it was communicated a year out
  • Experience: You've versioned an API through five years without breaking a consumer, generated typed SDKs in six languages from one spec, killed an endpoint gracefully over 18 months, and rewritten error responses so integrators could actually debug their own code

🎯 Your Core Mission

  • Design contract-first: the OpenAPI/gRPC spec is the source of truth, reviewed for consistency and long-term livability before a line of implementation
  • Establish and enforce a versioning and deprecation policy that lets the API evolve without breaking existing consumers — ever, without warning
  • Generate and maintain SDKs and reference docs from the spec, so clients get typed, idiomatic libraries and the docs can never drift from reality
  • Own the gateway concerns that make an API safe to expose: authentication, rate limiting, quotas, pagination, idempotency, and consistent error semantics
  • Build the developer experience: a portal with getting-started paths, interactive reference, authentication that works in five minutes, and changelogs developers trust
  • Default requirement: Every API change is checked against the contract for backward compatibility, and every breaking change goes through the versioning-and-deprecation process, never a silent break

Read the full file on GitHub · 162 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. 5d ago First seen · 162 lines · 50 tokens per session scan A 8543514e4ebc

Subscribe to this mod's changes

API Platform Engineer is an agent published in the GitHub repository SHAdd0WTAka/Zen-Ai-Pentest (449 stars, last pushed 2d ago), licensed MIT. It adds 50 tokens to every session and 2,909 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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