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 freemodbus-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/freemodbus-integration)<a href="https://agentmods.dev/skills/easyzoom/aix-skills/freemodbus-integration"><img src="https://agentmods.dev/badge/skills/easyzoom/aix-skills/freemodbus-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/freemodbus-integration"><img src="https://agentmods.dev/badge/skills/easyzoom/aix-skills/freemodbus-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 | $0.00717 |
| Opus 5 | $0.00022 | $0.00358 |
| Sonnet 5 | $0.00009 | $0.00143 |
| Haiku 4.5 | $0.00004 | $0.00072 |
Grade A, and why
freemodbus-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 10d 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.
FreeModbus Integration
Overview
Use this skill to integrate FreeModbus by proving the port layer first: serial/TCP transport, timing, event dispatch, and register callbacks. Modbus bugs are often timing, endian, addressing, or task-context problems rather than protocol logic.
When To Use
Use this skill when:
- The user wants to add or debug FreeModbus RTU, ASCII, or TCP.
- The issue involves
portserial.c,porttimer.c,portevent.c, register callbacks, CRC errors, timeouts, slave ID, function codes, or Modbus TCP/lwIP integration. - A device does not respond, responds with exception codes, or has wrong register values.
Do not use this skill when the UART or network transport is not verified. Use serial or lwIP skills first if the lower layer is unknown.
First Questions
Ask for:
- Mode: RTU, ASCII, TCP, master, slave, or gateway.
- MCU/RTOS/compiler and FreeModbus fork/version.
- Transport: UART/RS-485, TCP/lwIP, or custom.
- Baud, parity, stop bits, DE/RE control, slave ID, and timeout settings.
- Register map and callback code.
- Logic analyzer, serial capture, Modbus poll output, or exception codes.
Integration Checklist
-
Prove transport timing. For RTU, verify baud, parity, stop bits, inter-frame gap, and RS-485 direction control.
-
Implement port files. Serial, timer, and event callbacks must match the target scheduler and ISR rules.
-
Confirm protocol mode. RTU, ASCII, and TCP have different framing, timing, and porting requirements.
-
Validate register callbacks. Holding/input/coils/discrete callbacks must map Modbus addresses to internal storage correctly.
-
Check address and endian assumptions. Modbus register numbering, zero-based offsets, word order, and byte order must be explicit.
-
Test one function at a time. Start with a simple read holding register before adding writes, coils, or TCP gateway logic.
Common Failures
- RS-485 transmit enable timing cuts off the last byte.
- Timer tick is wrong, breaking RTU frame gap detection.
- Register addresses are off by one.
- Callback returns the wrong exception code or byte count.
- Modbus TCP works but RTU fails due to serial timing.
- Event handling blocks inside ISR or wrong task context.
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.
- 10d ago First seen · 85 lines · 43 tokens per session scan A 652ba302a8b6
freemodbus-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 717 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 2026-08-30.
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