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 easyzoom/aix-skills --skill ymodem-xmodem-integrationgit clone --depth 1 https://github.com/easyzoom/aix-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/easyzoom/aix-skills/ymodem-xmodem-integration)<a href="https://agentmods.dev/skills/easyzoom/aix-skills/ymodem-xmodem-integration"><img src="https://agentmods.dev/badge/skills/easyzoom/aix-skills/ymodem-xmodem-integration/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/easyzoom/aix-skills/ymodem-xmodem-integration"><img src="https://agentmods.dev/badge/skills/easyzoom/aix-skills/ymodem-xmodem-integration.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 | $0.00043 | $0.00694 |
| Opus 5 | $0.00022 | $0.00347 |
| Sonnet 5 | $0.00009 | $0.00139 |
| Haiku 4.5 | $0.00004 | $0.00069 |
Grade A, and why
ymodem-xmodem-integration 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 8d 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 — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
YMODEM XMODEM Integration
Overview
Use this skill for serial file-transfer protocols in bootloaders or maintenance consoles. Separate transport reliability, packet parsing, CRC/checksum, flash layout, and update safety before writing firmware to flash.
When To Use
Use this skill when:
- The user wants to add or debug XMODEM/YMODEM firmware update over UART, USB CDC, or shell.
- Transfers timeout, abort, fail CRC, write wrong file size, brick after update, or hang at
C/NAK negotiation. - The task involves bootloader app download, serial protocol state machines, packet size, CRC16, SOH/STX/EOT/CAN, or flash programming.
Do not use this skill for general serial logging. Use embedded-serial-log-debug first if RX/TX is unreliable.
First Questions
Ask for:
- Protocol: XMODEM, XMODEM-CRC, XMODEM-1K, YMODEM, or YMODEM batch.
- Transport, baud, flow control, timeout, and terminal sender tool.
- Bootloader/application flash layout and maximum image size.
- CRC/checksum mode and packet size.
- Whether current firmware/recovery image must be preserved.
- Current transfer log or packet trace.
Integration Checklist
-
Prove serial transport. Verify raw RX/TX at the target baud before protocol debugging.
-
Implement protocol states explicitly. Negotiation, header, data packets, ACK/NAK, EOT, CAN abort, retry limit, and timeout should be visible in logs.
-
Validate file metadata. For YMODEM, parse filename and size. Reject images larger than the allowed slot.
-
Write flash safely. Erase only the intended slot, program aligned chunks, verify CRC/hash, and preserve bootloader/recovery areas.
-
Commit update last. Mark the image bootable only after full transfer and verify succeed.
-
Test abort and power loss. Ensure failed transfers do not leave the product without a bootable image.
Common Failures
- Sender uses checksum mode while receiver expects CRC mode.
- Packet sequence number or complement validation is skipped.
- 1K packets overflow a small receive buffer.
- Flash erase starts before image size and slot are validated.
- EOT handling completes before final flash sync/verify.
- Failed transfer marks a bad image as bootable.
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.
- 8d ago First seen · 85 lines · 43 tokens per session scan A 9b65cebd3448
ymodem-xmodem-integration is a skill published in the GitHub repository easyzoom/aix-skills (31 stars, last pushed 1mo ago), licensed MIT. It adds 43 tokens to every session and 694 once invoked, about $0.0002 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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