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 eins78/agent-skills --skill send-to-kindlegit clone --depth 1 https://github.com/eins78/agent-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/eins78/agent-skills/send-to-kindle)<a href="https://agentmods.dev/skills/eins78/agent-skills/send-to-kindle"><img src="https://agentmods.dev/badge/skills/eins78/agent-skills/send-to-kindle/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/eins78/agent-skills/send-to-kindle"><img src="https://agentmods.dev/badge/skills/eins78/agent-skills/send-to-kindle.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 | $0.00100 | $0.02636 |
| Opus 5 | $0.00050 | $0.01318 |
| Sonnet 5 | $0.00020 | $0.00527 |
| Haiku 4.5 | $0.00010 | $0.00264 |
Grade A, and why
send-to-kindle 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 11d 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 — 193 lines — stays where its author put it; the contents beside it link to each section on GitHub.
send-to-kindle
Delivering a document to a Kindle. Covers what to produce, how it gets there, and the two failure modes that give no error message.
Producing the file is the pandoc skill's job —
scripts/md2kindle-epub.sh turns markdown into a suitable EPUB. This skill
starts at "the file exists".
Everything below is service behaviour, and it moves. Between 2022 and 2026 Amazon stopped accepting MOBI, started accepting EPUB, killed USB download of purchased books, and retired Word's Send-to-Kindle button. Statuses here are as of 2026-08; re-verify before relying on a dated claim.
Produce EPUB, not PDF
| EPUB | Reflowable — text re-wraps to the reader's font size and margins. Kindles do not render EPUB natively; Send-to-Kindle converts it server-side into the device's own format (KFX/AZW3) on delivery, which is what buys reflow, resizable type, and a native TOC. Free, no local tooling. |
| Fixed-layout. A PDF page is a fixed canvas — on a 6" screen it either shrinks to illegible or needs constant pan/zoom. Right for print, wrong for reading. An A5 print booklet is roughly 60% wider than a Paperwhite's visible area. | |
| MOBI / AZW | Not accepted as input since August 2022. Don't reach for an old MOBI recipe. |
| AZW3 (locally converted) | Only needed for the USB path — see below. |
Delivery routes (status as of 2026-08)
| Route | Status | Notes |
|---|---|---|
Send-to-Kindle email (…@kindle.com) |
Works | The default. Wireless, works over a phone hotspot. See the three facts below |
| Web upload (sendtokindle.com, drag-and-drop) | Works | Manual, but no sender allowlist to trip over |
| Kindle mobile app → "Import file" | Works | Only useful if the reader reads on the phone |
USB sideload into documents/ |
Works | A raw .epub copied over USB is not indexed by the Kindle library — convert to AZW3 locally first (e.g. Calibre). Email delivery gets that conversion for free. Unaffected by the 2025 removal of USB download for purchased Kindle Store books, which is a different thing |
| Send to Kindle desktop app | Being retired | Kindle for PC and the Windows desktop app shut down 2026-06-30. Email and web upload do not depend on it |
| Send to Kindle from Microsoft Word | Retired 2026-02-09 | The button is gone; web upload is unaffected |
| Wireless delivery to older hardware | Cut off for pre-2013 devices | The May-2026 cutoff hit Paperwhite 1 and older only. 2018-era hardware and newer keep full wireless delivery |
What ships with it
1 file 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.
- 11d ago First seen · 193 lines · 100 tokens per session scan A f53cdf1c0891
send-to-kindle is a skill published in the GitHub repository eins78/agent-skills (2 stars, last pushed today), licensed MIT. It adds 100 tokens to every session and 2,636 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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