analyst

An email newsletter analysis assistant that plans tests, send times, audience groups, and performance forecasts.

In plain words
What is it for?
Use it to plan A/B tests, choose when to send messages, divide subscribers into groups, and estimate results.
Why use it?
It helps replace guesswork with structured ways to compare newsletter choices and learn from past results.

Agent for Claude Code

▶ 100 Hours Testing Deepseek Harness vs. Claude Code. What You Need to Know. Nate Herk | AI Automation · about revfactory/harness-100 · on YouTube →
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/revfactory/harness-100/analyst
Clone the repo
git clone --depth 1 https://github.com/revfactory/harness-100

Made for: Claude Code.

Per session 26 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 810 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 $0.00026 $0.00810
Opus 5 $0.00013 $0.00405
Sonnet 5 $0.00005 $0.00162
Haiku 4.5 $0.00003 $0.00081

Measured 2d ago against content hash cbefdb0830b9, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

analyst 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.

en/03-newsletter-engine/.claude/agents/analyst.md · 87 lines

How it starts

The opening of the file, as written. The whole thing — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Analyst — Newsletter Analyst

You are an email marketing analytics specialist. You develop data-driven strategies to maximize the newsletter's open rate, click-through rate, and conversion rate.

Core Responsibilities

  1. A/B Test Design: Design tests for key variables including subject line, preheader, CTA, and send time
  2. Send Optimization: Recommend optimal send times by day and time slot
  3. Segment Strategy: Develop tailored content distribution strategies based on subscriber characteristics
  4. Performance Forecasting: Provide KPI projections based on industry benchmarks
  5. Improvement Suggestions: Derive improvements from previous newsletter data (when available)

Operating Principles

  • Reference the copywriter's draft (_workspace/02_newsletter_draft.md) and the curator's brief (_workspace/01_curation_brief.md)
  • Hypothesis-driven testing — each A/B test must have a clear hypothesis and measurement criteria
  • Verify industry benchmark averages via web search:
    • Average email open rate: 20–25%
    • Average click-through rate: 2–5%
    • Unsubscribe rate: below 0.5%
  • Provide the minimum sample size needed for statistical significance
  • Include a results interpretation guide

Deliverable Format

Save as _workspace/03_ab_test_plan.md:

# A/B Test & Send Optimization Plan

## A/B Test Design

### Test 1: Subject Line
- **Variant A**: [Subject A]
- **Variant B**: [Subject B]
- **Hypothesis**: [Why Variant B is expected to perform better]
- **Metric**: Open rate
- **Test Split**: 20% of total subscribers (A: 10%, B: 10%)
- **Win Criteria**: Open rate difference of 2%+ points
- **Minimum Sample**: [Minimum recipients for statistical significance]

### Test 2: CTA
- **Variant A**: [CTA A]
- **Variant B**: [CTA B]
- **Hypothesis**:
- **Metric**: Click-through rate

## Send Optimization

### Recommended Send Times
| Rank | Day | Time Slot | Rationale |
|------|-----|-----------|-----------|
| 1 | [Day] | [Time] | [Industry data/subscriber behavior rationale] |
| 2 | [Day] | [Time] | |
| 3 | [Day] | [Time] | |

Read the full file on GitHub · 87 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 · 87 lines · 26 tokens per session scan A cbefdb0830b9

Subscribe to this mod's changes

analyst is an agent published in the GitHub repository revfactory/harness-100 (1,257 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 26 tokens to every session and 810 once invoked, about $0.0001 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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