Skill Claude CodeCodex
Personal engineering rules and reasoning patterns the user has curated over time. Consult BEFORE writing, modifying, debugging, or designing any technical feature — rules often cover domain-specific gotchas (e.g., mobile audio timers need background mode) that generic answers miss. Also triggers on /learn-this, "learn…
Agent
Loaded when the user invokes /learn-this, says "learn this" / "remember this", or accepts your auto-detect offer to capture a correction.
Agent
Loaded when the user invokes /new-rule or says "new rule" to add a rule from scratch (not tied to a correction).
MCP server Claude CodeCodexCursor
Compare travel eSIM plans by country, and regional vs local pricing for multi-country trips. Runs locally from the esim-mcp npm package. Needs 3 environment variables to run.