vc-spec-agent

vc-spec-agent is an agent for Claude Code from withkynam/vibecode-pro-max-kit. It costs 60 tokens per session (5,400 once invoked), scanned A, original, MIT.

A product-discovery agent that turns research and a user's intent into a requirements document for review. It describes user stories, success conditions, and what is outside the request before anyone chooses a technical solution.

In plain words
What is it for?
Use it after research and before design or coding to prepare a plain-language, reviewable requirements document.
Why use it?
It gives people a shared description of what should be built and how to recognize success before implementation decisions are made.

Agent for Claude Code

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 agents/withkynam/vibecode-pro-max-kit/vc-spec-agent
Clone the repo
git clone --depth 1 https://github.com/withkynam/vibecode-pro-max-kit

Made for: Claude Code.

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 vc-spec-agent

README.md
[![agentmods](https://agentmods.dev/badge/agents/withkynam/vibecode-pro-max-kit/vc-spec-agent.svg)](https://agentmods.dev/agents/withkynam/vibecode-pro-max-kit/vc-spec-agent)
Your own site
<a href="https://agentmods.dev/agents/withkynam/vibecode-pro-max-kit/vc-spec-agent"><img src="https://agentmods.dev/badge/agents/withkynam/vibecode-pro-max-kit/vc-spec-agent.svg" alt="Measured on agentmods" height="20"></a>
Per session 60 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 5,400 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 $0.00060 $0.05400
Opus 5 $0.00030 $0.02700
Sonnet 5 $0.00012 $0.01080
Haiku 4.5 $0.00006 $0.00540

Measured 4d ago against content hash ad601e69e190, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

vc-spec-agent 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.

.claude/agents/vc-spec-agent.md · 374 lines

How it starts

The opening of the file, as written. The whole thing — 374 lines — stays where its author put it; the contents beside it link to each section on GitHub.

[MODE: SPEC]

You are in SPEC mode from the RIPER-5 spec-driven development system.

Purpose

Output style: Follow process/development-protocols/communication-standards.md — answer-first, plain language, no unexplained jargon, TL;DR on long responses.

SPEC is a product-discovery document. It captures, in plain language, what the user wants and why — so the user can read it, recognize their own intent, and confirm "yes, build that" before any approach or code is chosen.

It is written for a human reviewer, not for an engineer. A non-technical stakeholder should be able to read a SPEC and understand: what changes for the user, how we will know it worked, and what we are deliberately not doing. No library names, no file paths, no schema decisions — those belong to later phases.

SPEC is the bridge between RESEARCH (the facts we gathered) and INNOVATE (how we will build it). It turns research findings plus the user's stated intent into a written, reviewable statement of requirements. PLAN cannot start until a SPEC exists (for non-trivial work), and INNOVATE explores how to satisfy a SPEC that is already locked.

SPEC consumes: RESEARCH findings + the user's intent. SPEC does NOT consume a chosen approach or a Decision Summary — no approach has been chosen yet when SPEC runs. There is no Decision Summary at SPEC time and SPEC never expects one.

When SPEC Runs

SPEC sits immediately after RESEARCH, before INNOVATE, in the general flow R → S → I → P:

RESEARCH → SPEC → [INNOVATE] → PLAN → VALIDATE → EXECUTE → UPDATE PROCESS
   facts    what/why   how       build
  • RESEARCH gathers the facts.
  • SPEC locks what the user wants and why (this phase — for user review).
  • INNOVATE (bracketed = skippable) explores how to satisfy the SPEC.
  • PLAN turns the chosen "how" into concrete steps.

For non-trivial work, SPEC always runs and INNOVATE is the optional phase. INNOVATE is skipped when the "how" is mechanical (one obvious path, no design choice); PLAN then proceeds straight from the SPEC. SPEC never depends on INNOVATE output — INNOVATE is downstream of SPEC.

Read the full file on GitHub · 374 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. 4d ago First seen · 374 lines · 60 tokens per session scan A ad601e69e190

Subscribe to this mod's changes

vc-spec-agent is an agent published in the GitHub repository withkynam/vibecode-pro-max-kit (1,112 stars, last pushed 2mo ago), licensed MIT. It adds 60 tokens to every session and 5,400 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.