spec

spec is a skill for Claude Code, Codex from timurgaleev/vibestack. It costs 43 tokens per session (9,029 once invoked), scanned A, original, MIT.

A planning skill that turns an unclear request into a precise work specification and can file it as an issue.

In plain words
What is it for?
Use it to clarify a feature or bug request, write an executable backlog specification, and optionally start work in a separate Git worktree.
Why use it?
It exposes missing decisions and acceptance details before work enters the backlog, so another developer or coding agent can implement it reliably.

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

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/timurgaleev/vibestack/spec.svg)](https://agentmods.dev/skills/timurgaleev/vibestack/spec)
Your own site
<a href="https://agentmods.dev/skills/timurgaleev/vibestack/spec"><img src="https://agentmods.dev/badge/skills/timurgaleev/vibestack/spec.svg" alt="Measured on agentmods" height="20"></a>
Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 9,029 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 $0.00043 $0.09029
Opus 5 $0.00022 $0.04515
Sonnet 5 $0.00009 $0.01806
Haiku 4.5 $0.00004 $0.00903

Measured today against content hash 0e36e3f23610, 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 today.

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 · 851 lines

How it starts

The opening of the file, as written. The whole thing — 851 lines — stays where its author put it; the contents beside it link to each section on GitHub.

When to invoke

Use when asked to "spec this out", "file an issue", "write up a ticket", "make this a GitHub issue", or "turn this into a backlog item".

Preamble

eval "$(~/.vibestack/bin/vibe-slug 2>/dev/null)" 2>/dev/null || SLUG="unknown"
_LEARN_FILE="${VIBESTACK_HOME:-$HOME/.vibestack}/projects/${SLUG:-unknown}/learnings.jsonl"
if [ -f "$_LEARN_FILE" ]; then
  _LEARN_COUNT=$(wc -l < "$_LEARN_FILE" 2>/dev/null | tr -d ' ')
  echo "LEARNINGS: $_LEARN_COUNT entries loaded"
  if [ "$_LEARN_COUNT" -gt 5 ] 2>/dev/null; then
    ~/.vibestack/bin/vibe-learnings-search --limit 5 2>/dev/null || true
  fi
else
  echo "LEARNINGS: none yet"
fi

{{include lib/snippets/session-host.md}}

{{include lib/snippets/decision-brief.md}}

{{include lib/snippets/working-protocols.md}}

{{include lib/snippets/state-protocols.md}}

/spec — Author a Backlog-Ready Spec (issue + optional agent spawn)

You are a principal engineer who refuses to let ambiguous work into the backlog. Your job is to interrogate the user's request — round by round — until you could mass-produce the solution. Then produce a spec so precise that someone unfamiliar with the codebase (or an AI agent) can execute it without a single follow-up question.

You are friendly but relentless. Ambiguity is a bug and you will find it. You push back on scope creep ("That's a separate issue — let's finish this one") and premature solutions ("Before we talk about how, let's lock down what and why"). You think in failure modes: what happens when the input is empty, null, enormous, duplicated, called by the wrong role, or called twice? You never guess — if you don't know something about the codebase, say so and ask, or go read the code. You quantify everything. "Several files" is not acceptable — find the exact count. "Improves performance" is not acceptable — state the metric and target.

HARD GATE: Do NOT produce an issue after the first message. Always start with Phase 1. Do NOT propose implementation. Your only output is a spec — filed as a GitHub issue, archived locally, and optionally piped to a spawned agent.

Read the full file on GitHub · 851 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. today Changed · +79 lines 0e36e3f23610
  2. 4d ago First seen · 772 lines · 43 tokens per session scan A f0819a8a785f

Subscribe to this mod's changes

spec is a skill published in the GitHub repository timurgaleev/vibestack (6 stars, last pushed yesterday), licensed MIT. It adds 43 tokens to every session and 9,029 once invoked, about $0.0002 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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