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.
npx skills add cnfeat/top-pm-skills --skill cohort-analysisgit clone --depth 1 https://github.com/cnfeat/top-pm-skillsWrote 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.
[](https://agentmods.dev/skills/cnfeat/top-pm-skills/cohort-analysis)<a href="https://agentmods.dev/skills/cnfeat/top-pm-skills/cohort-analysis"><img src="https://agentmods.dev/badge/skills/cnfeat/top-pm-skills/cohort-analysis/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.
<a href="https://agentmods.dev/skills/cnfeat/top-pm-skills/cohort-analysis"><img src="https://agentmods.dev/badge/skills/cnfeat/top-pm-skills/cohort-analysis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00068 | $0.02337 |
| Opus 5 | $0.00034 | $0.01169 |
| Sonnet 5 | $0.00014 | $0.00467 |
| Haiku 4.5 | $0.00007 | $0.00234 |
Grade A, and why
cohort-analysis 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 7d 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.
How it starts
The opening of the file, as written. The whole thing — 196 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cohort Analysis Skill
This skill produces a structured cohort analysis covering retention curves, LTV estimation, behavioural segmentation, and actionable interventions. Output is ready to present to product leadership or share with growth and data teams.
Required Inputs
Ask the user for these if not provided:
- Analysis goal (retention improvement / LTV modelling / behavioural segmentation / churn prediction)
- Product or feature being analysed
- Cohort definition — what groups users? (acquisition month, signup channel, plan tier, feature adoption)
- Observation window — how many periods to track? (e.g. 12 months, 8 weeks)
- Key metric — what are you measuring per cohort? (retention rate, revenue, engagement score, feature usage)
- Available data — what tables/metrics are available? (paste schema or describe)
- Baseline — any existing retention benchmarks or goals?
Output Structure
Cohort Analysis: [Product / Feature]
Analysis type: [Retention / LTV / Behavioural / Churn] Cohort definition: [Acquisition month / Signup channel / Plan tier / Feature adoption date] Observation window: [X months / weeks] Primary metric: [Metric name] Date prepared: [Date]
1. Cohort Definitions
| Cohort | Period | Size | Description |
|---|---|---|---|
| [Cohort 1] | [Jan 2025] | [N users] | [e.g. Users who signed up in Jan 2025 via organic] |
| [Cohort 2] | [Feb 2025] | [N users] | [...] |
Cohort logic:
- Cohort entry event: [First sign-up / First purchase / Feature activation]
- Cohort exit criteria: [Churned / Downgraded / No activity for 30 days]
- Exclusions: [Trial users / Internal test accounts / Users with < X days of data]
2. Retention Curve
How to read: Each cell shows what % of the cohort performed the key metric in period N.
| Cohort | Period 0 | Period 1 | Period 2 | Period 3 | Period 6 | Period 12 |
|---|---|---|---|---|---|---|
| Jan 2025 | 100% | [X%] | [X%] | [X%] | [X%] | [X%] |
| Feb 2025 | 100% | [X%] | [X%] | [X%] | [X%] | [X%] |
| [Trend] | — | [↑/↓ vs prior] | [...] | [...] | [...] | [...] |
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.
- 7d ago First seen · 196 lines · 68 tokens per session scan A 96eb2887b42a
cohort-analysis is a skill published in the GitHub repository cnfeat/top-pm-skills (48 stars, last pushed 2mo ago), licensed MIT. It adds 68 tokens to every session and 2,337 once invoked, about $0.0003 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 2026-09-03.
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