agentmods.dev

spec-init

spec-init is a skill for Claude Code, Codex from legeling/PromptHub. It costs 73 tokens per session (5,662 once invoked), scanned A, original, AGPL-3.0.

A documentation-first workflow for starting or improving a software project’s specifications and development records.

In plain words
What is it for?
Use it to create or update specs, workflow documents, change records, README files, and agent instructions, then check that the implementation matches them.
Why use it?
It keeps the intended behavior, implementation changes, and project knowledge consistent as the code evolves.

Skill for Claude CodeCodex

not rated 1.6k +6 yesterday A scan 73 tokens AGPL-3.0
View the source file legeling/PromptHub
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/legeling/prompthub/spec-init
Any agent
npx skills add legeling/PromptHub --skill spec-init
Clone the repo
git clone --depth 1 https://github.com/legeling/PromptHub

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-init

README.md
[![agentmods](https://agentmods.dev/badge/skills/legeling/prompthub/spec-init.svg)](https://agentmods.dev/skills/legeling/prompthub/spec-init)
Your own site
<a href="https://agentmods.dev/skills/legeling/prompthub/spec-init"><img src="https://agentmods.dev/badge/skills/legeling/prompthub/spec-init.svg" alt="Measured on agentmods" height="20"></a>
Per session 73 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,662 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 $0.00073 $0.05662
Opus 5 $0.00036 $0.02831
Sonnet 5 $0.00015 $0.01132
Haiku 4.5 $0.00007 $0.00566

Measured 4d ago against content hash 93d108d15e39, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

spec-init 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 4d 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/skills/spec-init/SKILL.md · 453 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Files

What ships with it

60 files 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. 4d ago First seen · 453 lines · 73 tokens per session scan A 93d108d15e39

Subscribe to this mod's changes

spec-init is a skill published in the GitHub repository legeling/PromptHub (1,632 stars, last pushed yesterday), licensed AGPL-3.0. It adds 73 tokens to every session and 5,662 once invoked, about $0.0004 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 2026-08-30.

LLMPlanningProductivityWriting and docsagentaicli-toolpromptprompt-toolkit
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