debug

A debugging guide for MatClaw's container system, where the host starts an isolated Linux environment to run a coding agent and its tools.

In plain words
What is it for?
Use it to investigate failed containers, inspect logs, check environment variables, verify mounted files, and diagnose session or authentication issues.
Why use it?
It explains how files, sessions, environment data, and logs move between the host and container. This helps identify problems with startup, authentication, mounts, and session resumption.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/dingyanglyu/matclaw/debug
Any agent
npx skills add DingyangLyu/MatClaw --skill debug
Clone the repo
git clone --depth 1 https://github.com/DingyangLyu/MatClaw

Made for: Claude Code, Codex.

Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,933 The whole file, excluding the scripts and references it only reads on demand.
Security scan D 2 findings. Scan, not verified.
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 $0.00040 $0.02933
Opus 5 $0.00020 $0.01466
Sonnet 5 $0.00008 $0.00587
Haiku 4.5 $0.00004 $0.00293

Measured 2d ago against content hash e7ce1c7c3626, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade D, and why

debug scanned grade D with 2 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 2d 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

--dangerously-skip-permissions cannot be used with root/sudo privileges

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

rm -rf data/sessions/
Origin

Copies of this mod

8 near-identical copies found in the catalogue:

  • debug — 95% identical, 32 lines differ
  • debug — 95% identical, 34 lines differ
  • debug — 92% identical, 32 lines differ
  • debug — 92% identical, 32 lines differ
  • debug — 92% identical, 32 lines differ
  • debug — 92% identical, 32 lines differ
  • debug — 92% identical, 85 lines differ
  • debug — 92% identical, 32 lines differ
.claude/skills/debug/SKILL.md · 350 lines

How it starts

The opening of the file, as written. The whole thing — 350 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MatClaw Container Debugging

This guide covers debugging the containerized agent execution system.

Architecture Overview

Host (macOS)                          Container (Linux VM)
─────────────────────────────────────────────────────────────
src/container-runner.ts               container/agent-runner/
    │                                      │
    │ spawns container                      │ runs Claude Agent SDK
    │ with volume mounts                   │ with MCP servers
    │                                      │
    ├── data/env/env ──────────────> /workspace/env-dir/env
    ├── groups/{folder} ───────────> /workspace/group
    ├── data/ipc/{folder} ────────> /workspace/ipc
    ├── data/sessions/{folder}/.claude/ ──> /home/node/.claude/ (isolated per-group)
    └── (main only) project root ──> /workspace/project

Important: The container runs as user node with HOME=/home/node. Session files must be mounted to /home/node/.claude/ (not /root/.claude/) for session resumption to work.

Log Locations

Log Location Content
Main app logs logs/matclaw.log Host-side WhatsApp, routing, container spawning
Main app errors logs/matclaw.error.log Host-side errors
Container run logs groups/{folder}/logs/container-*.log Per-run: input, mounts, stderr, stdout
Claude sessions ~/.claude/projects/ Claude Code session history

Enabling Debug Logging

Set LOG_LEVEL=debug for verbose output:

# For development
LOG_LEVEL=debug npm run dev

# For launchd service (macOS), add to plist EnvironmentVariables:
<key>LOG_LEVEL</key>
<string>debug</string>
# For systemd service (Linux), add to unit [Service] section:
# Environment=LOG_LEVEL=debug

Debug level shows:

  • Full mount configurations
  • Container command arguments
  • Real-time container stderr

Common Issues

1. "Claude Code process exited with code 1"

Check the container log file in groups/{folder}/logs/container-*.log

Read the full file on GitHub · 350 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. 2d ago First seen · 350 lines · 40 tokens per session scan D e7ce1c7c3626

Subscribe to this mod's changes

debug is a skill published in the GitHub repository DingyangLyu/MatClaw (89 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 40 tokens to every session and 2,933 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it D with 2 findings (asks for root, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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