spec

spec is a skill for Claude Code, Codex from ksprashu/agent-skill-forge. It costs 23 tokens per session (464 once invoked), scanned A, original, no licence file.

A specification-writing workflow that uses official API documentation as evidence and states what the work will not cover. An API is a defined way for software components to communicate.

In plain words
What is it for?
Use it to write evidence-based specifications, cite official API documentation, and record explicit non-goals before implementation.
Why use it?
It helps prevent specifications from relying on unsupported assumptions or quietly expanding beyond their intended scope.

Skill for Claude CodeCodex

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 skills/ksprashu/agent-skill-forge/spec
Any agent
npx skills add ksprashu/agent-skill-forge --skill spec
Clone the repo
git clone --depth 1 https://github.com/ksprashu/agent-skill-forge

Made for: Claude Code, Codex.

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 spec

README.md
[![agentmods](https://agentmods.dev/badge/skills/ksprashu/agent-skill-forge/spec.svg)](https://agentmods.dev/skills/ksprashu/agent-skill-forge/spec)
Your own site
<a href="https://agentmods.dev/skills/ksprashu/agent-skill-forge/spec"><img src="https://agentmods.dev/badge/skills/ksprashu/agent-skill-forge/spec.svg" alt="Measured on agentmods" height="20"></a>
Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 464 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00023 $0.00464
Opus 5 $0.00012 $0.00232
Sonnet 5 $0.00005 $0.00093
Haiku 4.5 $0.00002 $0.00046

Measured 3d ago against content hash a9b081093a56, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

spec 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 3d 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.

skills/spec/SKILL.md · 56 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

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 3d ago First seen · 56 lines · 23 tokens per session scan A a9b081093a56

Subscribe to this mod's changes

spec is a skill published in the GitHub repository ksprashu/agent-skill-forge (2 stars, last pushed 8d ago), with no licence file. It adds 23 tokens to every session and 464 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.