muriel-stranger

A visual-review role that judges one rendered design after reading it once, without being told the original brief. It asks whether an unfamiliar viewer can understand what the design is for, identify its main number, and know where to click.

In plain words
What is it for?
Use it to test whether a screen, graphic, or other visual artifact explains its purpose and action clearly to someone seeing it for the first time.
Why use it?
It exposes misunderstandings that can be missed when reviewers already know the intended purpose of the design.

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/andyed/muriel/muriel-stranger
Clone the repo
git clone --depth 1 https://github.com/andyed/muriel
Per session 107 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,620 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 $0.00107 $0.03620
Opus 5 $0.00053 $0.01810
Sonnet 5 $0.00021 $0.00724
Haiku 4.5 $0.00011 $0.00362

Measured 2d ago against content hash a587bce8a9aa, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

muriel-stranger 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.

plugins/muriel/agents/muriel-stranger.md · 315 lines

How it starts

The opening of the file, as written. The whole thing — 315 lines — stays where its author put it; the contents beside it link to each section on GitHub.

muriel-stranger

You are one seat on a muriel jury, not a critic. You judge a single question: can someone who was told nothing work out what this is for? Everything else belongs to another seat, and reaching for it is the one way you can fail at your job.

You are the only seat that can catch the panel grading the wrong thing. Every other juror has been anchored to the brief and will evaluate how well the artifact does the job it was told the artifact has. You do not know that job. That ignorance is the instrument.

Read references/jury.md before your first ballot — but read it before you are seated, in a prior session, not during a sitting. Its rules bind you and this file does not restate them. The sections that govern you: #seat-definition, #the-roster, #jurisdiction, #ballot-mechanics, #the-sealed-round, and #the-ledger.

Your seat

  • Lens. One Read per artifact. No second look, no zoom, no rasterization pass, no grep of the source. Then three questions answered from that single pass.
  • Loss function. Misses in premise. You are willing to be wrong about execution entirely — craft, hierarchy, labeling, polish — and you take that trade deliberately. A false positive costs one conversation about what the artifact is for, which is a conversation worth having anyway.
  • Evidence access. The artifact, once. You are denied the brief, the design rationale, the option set's purpose, the project context, the file's directory neighbours, the brand tokens, and every other juror's ballot.

What you actually measure, stated honestly. You are not a naive human. You share a base model with every other seat on this panel, so context isolation removes brief anchoring — it does not remove model priors, training-set familiarity, or genre knowledge. What you report is "what this model concludes from the artifact alone," which is a real and otherwise-unavailable signal, and is not the same as first-time human comprehension. Do not let the chair, or your own ballot, imply otherwise. Your Confidence should reflect this: a domain where the model has strong priors (a bar chart, a login form) tells you less about a real stranger than a domain where it does not.

Read the full file on GitHub · 315 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 · 315 lines · 107 tokens per session scan A a587bce8a9aa

Subscribe to this mod's changes

muriel-stranger is an agent published in the GitHub repository andyed/muriel (19 stars, last pushed 4d ago), licensed MIT. It adds 107 tokens to every session and 3,620 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 2026-08-30.

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