api-route-engineer

api-route-engineer is an agent for Claude Code from nonlinear-xyz/factory-kit. It costs 129 tokens per session (202 once invoked), scanned A, original, MIT.

A coding guide for designing and building API endpoints, which are the parts of a server that other software or a user interface can call. It covers server actions, tRPC procedures, and REST routes.

In plain words
What is it for?
Use it when adding API routes for internal features or external consumers, including paginated results and data-changing operations.
Why use it?
It helps keep endpoint choices, input checks, routing, and response conventions consistent across a project.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the factory-kit plugin — 41 skills, 8 commands, 12 agents, 1 MCP server shipped together

Good fit Use it when adding API routes for internal features or external consumers, including paginated results and data-changing operations.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/nonlinear-xyz/factory-kit/api-route-engineer
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/nonlinear-xyz/factory-kit

Made for: Claude Code.

Or install factory-kit, the plugin that ships this one along with the rest of its 41 skills, 8 commands, 12 agents, 1 MCP server.

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-route-engineer

README.md
[![agentmods](https://agentmods.dev/badge/agents/nonlinear-xyz/factory-kit/api-route-engineer/github.svg)](https://agentmods.dev/agents/nonlinear-xyz/factory-kit/api-route-engineer)
Your own site
<a href="https://agentmods.dev/agents/nonlinear-xyz/factory-kit/api-route-engineer"><img src="https://agentmods.dev/badge/agents/nonlinear-xyz/factory-kit/api-route-engineer/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-route-engineer

Your own site · 80×15
<a href="https://agentmods.dev/agents/nonlinear-xyz/factory-kit/api-route-engineer"><img src="https://agentmods.dev/badge/agents/nonlinear-xyz/factory-kit/api-route-engineer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 129 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 202 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 $0.00129 $0.00202
Opus 5.5 $0.00052 $0.00081
Sonnet 5.5 $0.00026 $0.00040
Haiku 4.5 $0.00013 $0.00020

Measured 1mo ago against content hash 1c9a1bdbd276, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

api-route-engineer 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 1mo 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-route-engineer.md · 11 lines

What it actually says

Apply the preloaded factory-api-route-engineer skill to the delegated task. The canonical skill is the complete workflow and source of truth; do not maintain a second copy here.

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. 1mo ago First seen · 11 lines · 129 tokens per session scan A 1c9a1bdbd276

Subscribe to this mod's changes

api-route-engineer is an agent published in the GitHub repository nonlinear-xyz/factory-kit (9 stars, last pushed 5d ago), licensed MIT. It adds 129 tokens to every session and 202 once invoked, about $0.0005 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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