api

A REST API design guide covering endpoint names, responses, errors, versions, pagination, authentication, rate limits, and safe repeated requests.

In plain words
What is it for?
It helps define resource endpoints, error envelopes, deprecation rules, cursor pagination, filtering, sorting, idempotency keys, rate-limit headers, and public or internal access.
Why use it?
It removes ambiguity between API producers and consumers and establishes consistent behavior for errors, updates, old clients, and large result sets.

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/aneja5/forge-skills/api
Clone the repo
git clone --depth 1 https://github.com/aneja5/forge-skills
Per session 17 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 168 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 $0.00017 $0.00168
Opus 5 $0.00009 $0.00084
Sonnet 5 $0.00003 $0.00034
Haiku 4.5 $0.00002 $0.00017

Measured 2d ago against content hash 2e2fcb250793, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api 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.

commands/api.md · 15 lines

What it actually says

Invoke the forge-skills:api-design skill.

Define base conventions — verbs, status codes (no 200 OK with error body), resource naming, wire format. Write the error envelope schema (code, message, field, request_id, details). Set versioning + deprecation policy (URI / header / query), minimum 6-month public deprecation window. Define pagination (cursor preferred), filtering, sorting conventions. Specify idempotency for mutations (Idempotency-Key header, server replay for 24h+). Document rate-limiting headers and auth envelope. Mark every endpoint public or internal.

After writing: "API design written to .forge/api-design.md. Use as the contract for /architect module work."

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 · 15 lines · 17 tokens per session scan A 2e2fcb250793

Subscribe to this mod's changes

api is a command published in the GitHub repository aneja5/forge-skills (3 stars, last pushed 3mo ago), licensed MIT. It adds 17 tokens to every session and 168 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.