spec-write

spec-write is a command for Claude Code from elct9620/ai-spec-skills. It costs 21 tokens per session (2,262 once invoked), scanned A, original, Apache-2.0.

A command for writing or improving software specifications in stages: intent, scope, behavior, and detailed refinement.

In plain words
What is it for?
Use it to create new specifications, improve existing ones, split large requirements into smaller parts, and handle uncertainty.
Why use it?
It helps turn vague ideas into structured documents and review them for missing or unbalanced details.

Command for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: $skill-name invocation.

Part of the spec plugin — 4 skills, 2 commands shipped together

Good fit Use it to create new specifications, improve existing ones, split large requirements into smaller parts, and handle uncertainty.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/elct9620/ai-spec-skills/spec-write
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/elct9620/ai-spec-skills

Made for: Claude Code.

Or install spec, the plugin that ships this one along with the rest of its 4 skills, 2 commands.

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-write

README.md
[![agentmods](https://agentmods.dev/badge/commands/elct9620/ai-spec-skills/spec-write.svg)](https://agentmods.dev/commands/elct9620/ai-spec-skills/spec-write)
Your own site
<a href="https://agentmods.dev/commands/elct9620/ai-spec-skills/spec-write"><img src="https://agentmods.dev/badge/commands/elct9620/ai-spec-skills/spec-write.svg" alt="Measured on agentmods" height="20"></a>
Per session 21 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,262 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 $0.00021 $0.02262
Opus 5 $0.00010 $0.01131
Sonnet 5 $0.00004 $0.00452
Haiku 4.5 $0.00002 $0.00226

Measured 8d ago against content hash ce85f8f174cb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

spec-write 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 8d 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/spec-write.md · 152 lines

How it starts

The opening of the file, as written. The whole thing — 152 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Rule

The <execute name="main">ARGUMENTS</execute> is entry point for this command.

Skills Rubric

To select skills for writing or improving specifications, consider the following rubric:

Skill When to use Core
spec:spec-principles Always — foundational knowledge for any specification work.
spec:spec-framework Structuring specification content into layers with proper elements.
spec:spec-quality Verifying each phase passes rubric criteria and checking balance.
spec:spec-methodology Applying the progressive approach, splitting content, handling uncertainty.

Definition

Read the full file on GitHub · 152 lines

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. 8d ago First seen · 152 lines · 21 tokens per session scan A ce85f8f174cb

Subscribe to this mod's changes

spec-write is a command published in the GitHub repository elct9620/ai-spec-skills (2 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 21 tokens to every session and 2,262 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.