spec-writer

spec-writer is an agent for Claude Code from taipt1504/agent-skills. It costs 29 tokens per session (5,253 once invoked), scanned A, original, no licence file.

A specification-writing agent that turns an approved plan into concrete, testable agreements about how the software should behave.

In plain words
What is it for?
Use it after plan approval, when the project needs behavioral specifications or testable contracts.
Why use it?
It removes ambiguity from implementation by describing expected behavior in terms that can be checked.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the devco-agent-skills plugin — 32 skills, 16 commands, 10 agents, 7 hooks shipped together

Good fit Use it after plan approval, when the project needs behavioral specifications or testable contracts.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/taipt1504/agent-skills/spec-writer
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/taipt1504/agent-skills

Made for: Claude Code.

Or install devco-agent-skills, the plugin that ships this one along with the rest of its 32 skills, 16 commands, 10 agents, 7 hooks.

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-writer

README.md
[![agentmods](https://agentmods.dev/badge/agents/taipt1504/agent-skills/spec-writer/github.svg)](https://agentmods.dev/agents/taipt1504/agent-skills/spec-writer)
Your own site
<a href="https://agentmods.dev/agents/taipt1504/agent-skills/spec-writer"><img src="https://agentmods.dev/badge/agents/taipt1504/agent-skills/spec-writer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for spec-writer

Your own site · 80×15
<a href="https://agentmods.dev/agents/taipt1504/agent-skills/spec-writer"><img src="https://agentmods.dev/badge/agents/taipt1504/agent-skills/spec-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 29 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 5,253 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 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 5.1 $0.00029 $0.05253
Opus 5 $0.00015 $0.02627
Sonnet 5 $0.00006 $0.01051
Haiku 4.5 $0.00003 $0.00525

Measured 8d ago against content hash b013f5c84981, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

spec-writer 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.

agents/spec-writer.md · 534 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

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 · 534 lines · 29 tokens per session scan A b013f5c84981

Subscribe to this mod's changes

spec-writer is an agent published in the GitHub repository taipt1504/agent-skills (4 stars, last pushed 3mo ago), with no licence file. It adds 29 tokens to every session and 5,253 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.

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