segger-rtt-integration

segger-rtt-integration is a skill for Claude Code, Codex from easyzoom/aix-skills. It costs 41 tokens per session (569 once invoked), scanned A, original, MIT.

A guide for using SEGGER RTT, a low-overhead logging and terminal channel between embedded firmware and a J-Link debug probe.

In plain words
What is it for?
Use it to configure RTT source files, memory placement, channels, buffers, blocking modes, J-Link connections, and debug output.
Why use it?
It helps resolve missing logs, blocked output, failed input, and control-block or buffer setup errors during firmware debugging.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to configure RTT source files, memory placement, channels, buffers, blocking modes, J-Link connections, and debug output.

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Install with agentmods
npx agentmods add skills/easyzoom/aix-skills/segger-rtt-integration
Install

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.

Any agent
npx skills add easyzoom/aix-skills --skill segger-rtt-integration
Clone the repo
git clone --depth 1 https://github.com/easyzoom/aix-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

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README.md
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Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 569 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00041 $0.00569
Opus 5 $0.00020 $0.00284
Sonnet 5 $0.00008 $0.00114
Haiku 4.5 $0.00004 $0.00057

Measured 8d ago against content hash c7cc13c286cd, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

segger-rtt-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.

skills/segger-rtt-integration/SKILL.md · 79 lines

How it starts

The opening of the file, as written. The whole thing — 79 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SEGGER RTT Integration

Overview

Use this skill to integrate SEGGER RTT as a low-intrusion debug channel. Prove the RTT control block, buffer configuration, J-Link connection, and blocking policy before relying on RTT logs in timing-sensitive firmware.

When To Use

Use this skill when:

  • The user wants SEGGER RTT logs or terminal input on an MCU.
  • RTT Viewer/J-Link cannot find the control block, logs are missing, output blocks, or input commands fail.
  • The task involves RTT buffers, up/down channels, blocking modes, J-Link, SystemView, or debug builds.

Do not use this skill when the debug probe cannot connect. Use architecture or flashing debug skills first.

First Questions

Ask for:

  • MCU/core, debug probe, J-Link software version, and IDE/toolchain.
  • RTT source files/config and whether SEGGER_RTT_Init() is called.
  • Output mode: blocking, no-block-skip, or no-block-trim.
  • Buffer sizes and channels used.
  • Whether caches, MPU, low power, or secure/non-secure memory are involved.

Integration Checklist

  1. Include RTT sources once. Avoid duplicate control blocks from multiple copies of RTT source.

  2. Place control block in accessible RAM. J-Link must be able to locate and read the RTT control block.

  3. Configure buffer policy. Blocking output can disturb real-time behavior; choose mode intentionally.

  4. Verify host tooling. RTT Viewer, J-Link console, IDE plugin, or SystemView must attach to the correct target.

  5. Handle cache and low power. Cacheable memory and deep sleep can hide or disrupt RTT buffers.

Common Failures

  • Control block optimized out or duplicated.
  • RTT logs block because host is disconnected and blocking mode is used.
  • Buffers too small for burst logs.
  • J-Link scans wrong RAM region.
  • Cache prevents host from seeing updated data on some cores.

Verification

Before claiming RTT works:

  • State probe, RTT source/config, buffer sizes, and blocking mode.
  • Confirm host tool sees the control block.
  • Confirm one output channel and one input channel if input is needed.
  • Confirm behavior with host disconnected if product timing matters.

Read the full file on GitHub · 79 lines

Changes

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.

  1. 8d ago First seen · 79 lines · 41 tokens per session scan A c7cc13c286cd

Subscribe to this mod's changes

segger-rtt-integration is a skill published in the GitHub repository easyzoom/aix-skills (31 stars, last pushed 1mo ago), licensed MIT. It adds 41 tokens to every session and 569 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.