vibeflow-gen-spec

vibeflow-gen-spec is a skill for Claude Code, Codex from pe-menezes/vibeflow. It costs 67 tokens per session (1,369 once invoked), scanned A, original, MIT.

A workflow that turns a feature request or product requirements document into a technical specification. The specification defines the work, what is out of scope, implementation decisions, risks, project patterns, and testable completion checks.

In plain words
What is it for?
Use it when requirements are clear and you are ready to define the implementation scope and Definition of Done. It can also split specifications that are too large.
Why use it?
It converts broad requirements into a clear implementation contract, so developers know what must be built and how completion will be judged.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it when requirements are clear and you are ready to define the implementation scope and Definition of Done. It can also split specifications that are too large.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/pe-menezes/vibeflow/vibeflow-gen-spec
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.

Any agent
npx skills add pe-menezes/vibeflow --skill vibeflow-gen-spec
Clone the repo
git clone --depth 1 https://github.com/pe-menezes/vibeflow

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 vibeflow-gen-spec

README.md
[![agentmods](https://agentmods.dev/badge/skills/pe-menezes/vibeflow/vibeflow-gen-spec/github.svg)](https://agentmods.dev/skills/pe-menezes/vibeflow/vibeflow-gen-spec)
Your own site
<a href="https://agentmods.dev/skills/pe-menezes/vibeflow/vibeflow-gen-spec"><img src="https://agentmods.dev/badge/skills/pe-menezes/vibeflow/vibeflow-gen-spec/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 vibeflow-gen-spec

Your own site · 80×15
<a href="https://agentmods.dev/skills/pe-menezes/vibeflow/vibeflow-gen-spec"><img src="https://agentmods.dev/badge/skills/pe-menezes/vibeflow/vibeflow-gen-spec.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 67 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,369 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00067 $0.01369
Opus 5 $0.00034 $0.00685
Sonnet 5 $0.00013 $0.00274
Haiku 4.5 $0.00007 $0.00137

Measured 12d ago against content hash 8d81d93104cb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

vibeflow-gen-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 12d 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.

cursor/skills/vibeflow-gen-spec/SKILL.md · 112 lines

How it starts

The opening of the file, as written. The whole thing — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Vibeflow: Gen-Spec

Generate a spec for a feature or task. Includes objective, DoD, scope, anti-scope, technical decisions, and risks. Grounded in the project's real patterns from .vibeflow/.

Usage: Provide the feature description or path to a PRD file as input.


Language

Detect the language of the user's input. Write ALL output in that same language. Technical terms in English are acceptable regardless of the detected language. One heading is exempt: ## References stays literally in English in any output language — prompt-pack's propagation matches that exact heading.

Before writing the spec

  1. Read the input. A path to a .md inside .vibeflow/prds/ is a PRD: problem, audience, solution, scope, and anti-scope are already settled — your job is translating them into technical decisions, binary DoD checks, and applicable patterns. Anything else is a feature description.

  2. Load context from .vibeflow/, if it exists:

    • index.md — project context. Its Suggested budget: ≤ N line is this spec's budget; without it, ≤6 files.
    • conventions.md — the project's standards.
    • Patterns: read the ## Pattern Registry block in index.md (between <!-- vibeflow:patterns:start/end --> markers), cross-reference its tags and modules against the feature, and load the top 3–5 matches. With no registry, fall back to reading all pattern docs.

    No .vibeflow/ → warn that results improve after the vibeflow-analyze skill, then read the relevant code directly.

  3. Identify what exists today for this feature and which patterns apply to it.

  4. Collect what the input points at — test files, mockups, code to port, the URL of a reference implementation — and what each one is for. A reference in code pins the target behavior better than a paragraph describing it.

PRD Validation Gate

Runs only when the input is a PRD — a .md path, or text longer than 3 lines. A short description skips the gate.

Five checks before generating:

Read the full file on GitHub · 112 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. 12d ago First seen · 112 lines · 67 tokens per session scan A 8d81d93104cb

Subscribe to this mod's changes

vibeflow-gen-spec is a skill published in the GitHub repository pe-menezes/vibeflow (29 stars, last pushed 6d ago), licensed MIT. It adds 67 tokens to every session and 1,369 once invoked, about $0.0003 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.

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