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 ckorhonen/claude-skills --skill poplar-direct-mailgit clone --depth 1 https://github.com/ckorhonen/claude-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/ckorhonen/claude-skills/poplar-direct-mail)<a href="https://agentmods.dev/skills/ckorhonen/claude-skills/poplar-direct-mail"><img src="https://agentmods.dev/badge/skills/ckorhonen/claude-skills/poplar-direct-mail/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/ckorhonen/claude-skills/poplar-direct-mail"><img src="https://agentmods.dev/badge/skills/ckorhonen/claude-skills/poplar-direct-mail.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 | $0.00047 | $0.06617 |
| Opus 5 | $0.00023 | $0.03308 |
| Sonnet 5 | $0.00009 | $0.01323 |
| Haiku 4.5 | $0.00005 | $0.00662 |
Grade A, and why
poplar-direct-mail scanned grade A with 1 finding 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 12d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -H "Authorization: Bearer YOUR_TOKEN" \ How it starts
The opening of the file, as written. The whole thing — 967 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Poplar Direct Mail
Overview
Design professional direct mail creative using Poplar's HTML template system and send programmatic mail pieces via their API. This skill covers template creation with dynamic personalization, API integration for triggered mailings, and creative best practices for high-converting direct mail campaigns.
When to Use
- Creating HTML templates for direct mail postcards, bi-folds, tri-folds, or letters
- Building triggered/programmatic direct mail campaigns
- Integrating direct mail into marketing automation workflows
- Designing personalized mail pieces with dynamic content (names, offers, QR codes)
- Sending transactional mail (receipts, confirmations, statements)
- Setting up abandoned cart or win-back mail campaigns
Prerequisites
- Poplar account (heypoplar.com)
- API access token from Poplar Credentials
- Python 3.9+ (for scripts)
requestspackage
Installation
pip install requests
Set your API token:
# Test token (for development - only works with mailing endpoint)
export POPLAR_API_TOKEN="test_your_token_here"
# Production token (for live mailings)
export POPLAR_API_TOKEN="your_production_token_here"
Mail Formats & Dimensions
Postcards
| Size | Final Trim | With Bleed | Pixels (300 PPI) |
|---|---|---|---|
| 4" x 6" | 4" x 6" | 4.25" x 6.25" | 1275 x 1875 |
| 6" x 9" | 6" x 9" | 6.25" x 9.25" | 1875 x 2775 |
| 6" x 11" | 6" x 11" | 6.25" x 11.25" | 1875 x 3375 |
Best for: Retargeting, time-sensitive promotions, simple messaging, direct mail newcomers
Bi-folds
| Format | Pixels (300 PPI) |
|---|---|
| Short-fold (folds left to right) | 1725 x 5175 |
| Long-fold (folds top to bottom) | 3375 x 2625 |
Best for: Prospecting campaigns, new product launches, complex value propositions
Tri-folds
| Format | Pixels (300 PPI) |
|---|---|
| Standard Tri-fold | 2625 x 4987 |
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 12d ago First seen · 967 lines · 47 tokens per session scan A 4157aefe5eb2
poplar-direct-mail is a skill published in the GitHub repository ckorhonen/claude-skills (14 stars, last pushed 2mo ago), licensed MIT. It adds 47 tokens to every session and 6,617 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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