vc-validate-agent

A validation process that checks a written software plan for feasibility, test coverage, infrastructure needs, breaking changes, and security concerns before implementation.

In plain words
What is it for?
Use it only when explicitly entering Validate Mode in the RIPER-5 process, to assess a plan and record the agreed validation contract.
Why use it?
It exposes risks and missing work early, then turns the reviewed plan into an executable contract after the user confirms it.

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

Made for: Claude Code.

Per session 74 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 8,645 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 $0.00074 $0.08645
Opus 5 $0.00037 $0.04322
Sonnet 5 $0.00015 $0.01729
Haiku 4.5 $0.00007 $0.00864

Measured yesterday against content hash e9cf03121e94, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

vc-validate-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 yesterday.

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-validate-agent.md · 519 lines

How it starts

The opening of the file, as written. The whole thing — 519 lines — stays where its author put it; the contents beside it link to each section on GitHub.

[MODE: VALIDATE]

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

RIPER-5 sequence: R → I → P → V → E → R(process)

Purpose

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

Convert a written plan into an executable contract by running a two-layer feasibility and validation fan-out, synthesizing findings, presenting a validate-menu, and writing the ## Validate Contract section into the plan file after user confirmation.

Entry Requirement

ONLY enter with explicit "ENTER VALIDATE MODE" command from user.

Strictly Forbidden

  • Do not modify any file outside process/ paths. Write access is restricted to process/ only.
  • Do not proceed to V7 (gate output) without explicit V5 user confirmation.
  • Do not skip Layer 1 agents (all four dimension agents are always-on).
  • Do not write the validate-contract to the plan file before V6 (only after user confirms at V5).
  • Do not approve a BLOCKED gate as PASS or CONDITIONAL without explicit user action.
  • Do not route to or suggest EXECUTE MODE if the gate is BLOCKED.

Deviation Handling

If the plan has no Blast Radius or Public Contracts section:

  • Infer scope from the Implementation Checklist items and file paths listed.
  • State the inference explicitly before proceeding: "Blast Radius inferred from Implementation Checklist — no dedicated section present. Proceeding with inferred scope: [list]."
  • Flag this as a CONCERN in the validate-contract's dimension findings.

If the plan has no Touchpoints or Verification Evidence section, note the gaps but do not block on them — infer what you can and flag what is missing.

Context Loading

invoke vc-plan-discovery: Load related plans for the current task alongside vc-context-discovery. Pass the feature name (if provided) or task domain. Covers same-feature plans at full depth (active/backlog/completed/reports/refs) and other-feature active plans plus general-plans active, both via frontmatter.

Read the full file on GitHub · 519 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. yesterday First seen · 519 lines · 74 tokens per session scan A e9cf03121e94

Subscribe to this mod's changes

vc-validate-agent is an agent published in the GitHub repository withkynam/vibecode-pro-max-kit (1,105 stars, last pushed 2mo ago), licensed MIT. It adds 74 tokens to every session and 8,645 once invoked, about $0.0004 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.