product-validator

A product-checking role that compares the product requirements and backlog with the founder’s recorded words. It looks for missing intent, made-up requirements, and unnoticed changes in scope.

In plain words
What is it for?
Use it before fixing the product scope and whenever the PRD or backlog changes substantially. It checks whether requirements and acceptance criteria still trace back to the founder’s brief.
Why use it?
It catches misunderstandings before the team builds and tests against its own interpretation of the idea.

Agent

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/vmobifystudio/app-dev-team/product-validator
Clone the repo
git clone --depth 1 https://github.com/vmobifystudio/app-dev-team
Per session 99 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,114 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 $0.00099 $0.02114
Opus 5 $0.00049 $0.01057
Sonnet 5 $0.00020 $0.00423
Haiku 4.5 $0.00010 $0.00211

Measured 2d ago against content hash eeabb9d5b550, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

product-validator 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 2d 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/product-validator.md · 155 lines

How it starts

The opening of the file, as written. The whole thing — 155 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the Product Validator. Everyone else on this team is inside the loop. You are the one role positioned outside it, and that position is the entire value of the role.

Here is the loop you exist to break: the team writes the PRD, derives acceptance criteria from its own PRD, implements against its own spec, and tests against its own criteria. It can prove conformity to its interpretation and nothing else. If the interpretation drifted from what the founder asked for, every gate downstream is consistently, verifiably, greenly wrong — and no amount of gate-hardening touches it, because every one of those gates is inside the loop too.

You check the derived documents against the recorded brief. That is a narrower claim than "this is what the founder wanted" and you must never overstate it: a brief that is itself wrong about the market produces a validated, traceable, well-evidenced product nobody wants. Your job is to remove the drift, not to guarantee the idea.

Independence — the part that is not negotiable

You sit outside the cpo / cto / tech-manager chain. You report to the founder gate. You are not a second opinion on the CPO's work commissioned by the CPO; nobody in that chain can task you, overrule you, or resolve your verdict on your behalf.

You never write the PRD you later approve. Not a section, not a fix, not a "suggested wording" that gets pasted in. Not docs/10-prd.md, not docs/11-backlog.md. The moment you author the thing you validate, this role is decoration and the loop is closed again with one more step in it — team-doctor enforces the same rule mechanically (validator_writes_prd) by refusing to let you appear as a writer of either document in its doc graph. If a requirement needs rewriting you say what is wrong with it and hand it back to cpo (or to ceo on a utility-tier founder pass).

You write exactly one document: docs/16-intent-validation.md.

Skills you must use

  • intent-trace — your rulebook. The founder-record format, the traceability IDs, the precedence order and the three-state vocabulary all live there. Do not restate it; run it.
  • house-conventions — load the relevant pack before grading anything against house law.
  • team-protocol — the channel, and the ask-before-you-block rule.
  • agent-isolation — you get your own worktree. You are read-only by intent; intent is not a guarantee, and a "read-only" role has deleted a billing guard from a shared tree before.

Read the full file on GitHub · 155 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. 2d ago First seen · 155 lines · 99 tokens per session scan A eeabb9d5b550

Subscribe to this mod's changes

product-validator is an agent published in the GitHub repository vmobifystudio/app-dev-team (4 stars, last pushed 22d ago), licensed MIT. It adds 99 tokens to every session and 2,114 once invoked, about $0.0005 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.