experiment-attempt-review

experiment-attempt-review is an agent for Claude Code from rapidreview-io/Merv. It costs 102 tokens per session (1,060 once invoked), scanned A, original, Apache-2.0.

A read-only reviewer for experiments managed through Merv, a system for running and tracking experiments. It is used only when Merv explicitly requests an experiment review.

In plain words
What is it for?
Reviewing an experiment after Merv requests an experiment review and returning findings to the requesting agent.
Why use it?
It provides a review step without changing the experiment. This helps keep experiment assessment separate from the agent doing the work.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md).

Part of the merv plugin — 9 skills, 5 agents, 1 MCP server shipped together

Good fit Reviewing an experiment after Merv requests an experiment review and returning findings to the requesting agent.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/rapidreview-io/merv/experiment-attempt-review
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.

Clone the repo
git clone --depth 1 https://github.com/rapidreview-io/Merv

Made for: Claude Code.

Or install merv, the plugin that ships this one along with the rest of its 9 skills, 5 agents, 1 MCP server.

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 experiment-attempt-review

README.md
[![agentmods](https://agentmods.dev/badge/agents/rapidreview-io/merv/experiment-attempt-review/github.svg)](https://agentmods.dev/agents/rapidreview-io/merv/experiment-attempt-review)
Your own site
<a href="https://agentmods.dev/agents/rapidreview-io/merv/experiment-attempt-review"><img src="https://agentmods.dev/badge/agents/rapidreview-io/merv/experiment-attempt-review/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 experiment-attempt-review

Your own site · 80×15
<a href="https://agentmods.dev/agents/rapidreview-io/merv/experiment-attempt-review"><img src="https://agentmods.dev/badge/agents/rapidreview-io/merv/experiment-attempt-review.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 102 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,060 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.
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 $0.00102 $0.01060
Opus 5 $0.00051 $0.00530
Sonnet 5 $0.00020 $0.00212
Haiku 4.5 $0.00010 $0.00106

Measured yesterday against content hash 2918a03e32e8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

experiment-attempt-review 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.

merv/agents/experiment-attempt-review.md · 100 lines

How it starts

The opening of the file, as written. The whole thing — 100 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Experiment Attempt Review

Judge whether the submitted attempt supports its conclusion under the approved plan. Treat the plan's Evaluation section as the pre-registered contract.

Start read-only

Call agent.hello once first — this review is its own context window — and pass the returned agent_id in every Merv call that follows.

Use the assigned experiment_id and review_request_id. In an auto-run session, call review.start with reviewer_capability="assigned" and caller_session_id="assigned"; Merv resolves your authenticated identity. For an interactive handoff, require its exact capability and use your own stable caller_session_id, distinct from the producer, with optional declared_agent. Begin with its pinned project context, plan, report, and artifact references. Batch the listed result, graph, and exhibit ids through artifact.read only when their full submitted evidence is needed. Inspect retained outputs and durable run receipts before reproducing work; a fresh review is not a reason to rerun completed jobs.

Operate read-only. Auto-run credentials enforce this boundary; interactive reviewers must follow it when using a general project key. Do not mutate the work, its artifacts, sandboxes, or workflow directly. Use only review.start and review.submit for review mutations. Submission applies the graph's verdict route and ends your assignment.

Verify the attempt

Check the attempt as one evidence chain:

  1. Plan conformance: Did execution follow the approved method, outputs, metrics, data population, baseline, seeds, decision rule, success threshold, and invalidation conditions?
  2. Numeric record: Do machine-readable results and any system exhibit agree with the report? Account for every submitted row, including failed, aborted, partial, and unfavorable runs. Unexplained discrepancies or selective reporting require rejection.
  3. Semantic validity: Inspect code or exact artifacts when needed to detect leakage, evaluation on training data, invalid normalization, mislabeled populations, broken baselines, or metrics that are numerically plausible but scientifically false.
  4. Deviations: Are all departures from the approved plan disclosed and justified? Decide whether they invalidate execution or the design itself.
  5. Logic graph: Does it honestly capture the questions, decisions, pivots, failures, and lessons? Reject a generated metrics diagram, pipeline, provenance map, or story that hides known rework. Do not prescribe its vocabulary or layout.
  6. Conclusion: Apply the registered decision rule to the observed record. Reject goalpost changes, cherry-picking, or claims broader than the tested scope.

Read the full file on GitHub · 100 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 Changed · +2 lines · +4 tokens per session 2918a03e32e8
  2. 12d ago First seen · 98 lines · 98 tokens per session scan A 1a115cd078d0

Subscribe to this mod's changes

experiment-attempt-review is an agent published in the GitHub repository rapidreview-io/Merv (5 stars, last pushed today), licensed Apache-2.0. It adds 102 tokens to every session and 1,060 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.

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