How do I install the Log skill?

Run npx skillmds add majiayu000/log in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Log skill do?

Logging skill for the ikigai project It is listed under Coding & Dev Tools on SkillMD.

This skill has not completed SkillMD's automated safety review yet. Capability flags: docs only. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Log?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

majiayu000 (@majiayu000) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Log by majiayu000 — Agent Skill

Name: Log
Rating: 4.666666666666667 (3 reviews)
Author: majiayu000

File contents

Logging

Critical: Alternate Buffer Mode

ikigai runs in terminal alternate buffer mode. stdout/stderr are not visible during execution. Do not use printf() or fprintf(stderr, ...) for debugging.

Use the logger instead - it writes to a file you can inspect.

Usage

#include "logger.h"

// Legacy printf-style (being deprecated)
ik_log_debug("value=%d", x);
ik_log_info("started processing");
ik_log_warn("unexpected state");
ik_log_error("operation failed: %s", reason);

// New JSONL API (preferred)
yyjson_mut_doc *doc = ik_log_create();
yyjson_mut_val *root = yyjson_mut_doc_get_root(doc);
yyjson_mut_obj_add_str(doc, root, "event", "chunk_received");
yyjson_mut_obj_add_int(doc, root, "bytes", len);
ik_log_debug_json(doc);  // Takes ownership, frees doc

Inspecting Logs

# Tail logs during development
tail -f $PWD/.ikigai/logs/current/log

Levels

debug - Development tracing
info - Normal operations
warn - Recoverable issues
error - Failures
fatal - Calls exit(1) after logging

Frequently asked questions