plan-api-service

A command for planning and designing a backend API service—an interface that lets other programs request data or actions from your system.

In plain words
What is it for?
Use it to plan API features, endpoints, request formats, authentication, scaling, deployment, documentation, and integrations with existing systems.
Why use it?
It provides a structured workflow for turning an idea into an API design, system architecture, infrastructure plan, and development roadmap.

Command

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 commands/masayan1126/masayan-uni-code-plugins/plan-api-service
Clone the repo
git clone --depth 1 https://github.com/masayan1126/masayan-uni-code-plugins
Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 134 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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 $0.00015 $0.00134
Opus 5 $0.00008 $0.00067
Sonnet 5 $0.00003 $0.00027
Haiku 4.5 $0.00002 $0.00013

Measured 2d ago against content hash 272278e45f9e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

plan-api-service 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.

plugins/project-planner/commands/plan-api-service.md · 14 lines

What it actually says

Execute the skill at skills/api-service-planning to plan and design a backend API service.

Read the following files to understand the workflow:

  • skills/api-service-planning/SKILL.md - Skill overview
  • skills/api-service-planning/WORKFLOW.md - Detailed workflow
  • skills/api-service-planning/TEMPLATES.md - Planning document templates
  • skills/api-service-planning/BEST_PRACTICES.md - Best practices

For monetization guidance, refer to skills/common/MONETIZATION.md.

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 · 14 lines · 15 tokens per session scan A 272278e45f9e

Subscribe to this mod's changes

plan-api-service is a command published in the GitHub repository masayan1126/masayan-uni-code-plugins (5 stars, last pushed 5mo ago), licensed MIT. It adds 15 tokens to every session and 134 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 2026-08-31.