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 agentmods add skills/jl-codes/platformio-mcp/serial-diagnosticsnpx skills add jl-codes/platformio-mcp --skill serial-diagnosticsgit clone --depth 1 https://github.com/jl-codes/platformio-mcpWrote 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/jl-codes/platformio-mcp/serial-diagnostics)<a href="https://agentmods.dev/skills/jl-codes/platformio-mcp/serial-diagnostics"><img src="https://agentmods.dev/badge/skills/jl-codes/platformio-mcp/serial-diagnostics.svg" alt="Measured on agentmods" 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 | $0.00043 | $0.00241 |
| Opus 5 | $0.00022 | $0.00120 |
| Sonnet 5 | $0.00009 | $0.00048 |
| Haiku 4.5 | $0.00004 | $0.00024 |
Grade A, and why
serial-diagnostics 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 5d 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.
What it actually says
Serial Diagnostics
Purpose
Use this skill when firmware builds and flashes but the device has runtime issues.
Safety Rules
- Do not interrupt an active flash operation.
- Do not start multiple monitors on the same port.
- Do not assume silence means success.
- Preserve serial logs.
Workflow
- Confirm the target device and serial port.
- Start or query the serial monitor.
- Capture logs for a bounded time window.
- Identify boot markers, panic traces, reset loops, or missing output.
- Summarize runtime health.
- Recommend the smallest next code change.
- If needed, patch firmware and rebuild.
- Ask before reflashing.
Runtime Patterns
Detect:
BOOT_OK
watchdog reset
brownout detector
Guru Meditation
panic
stack overflow
heap corruption
reboot loop
no serial output
sensor init failed
WiFi failed
BLE failed
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.
- 5d ago First seen · 48 lines · 43 tokens per session scan A bb85dd79c531
serial-diagnostics is a skill published in the GitHub repository jl-codes/platformio-mcp (50 stars, last pushed 2mo ago), licensed MIT. It adds 43 tokens to every session and 241 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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