oh-my-codex: Skill for Codex

.codex/skills/learner/SKILL.md

learner is a skill for Codex from junghwaYang/oh-my-codex. It costs 0 tokens per session (697 once invoked), scanned A, original, MIT.

A learning aid that turns solved problems into reusable problem-solving patterns, such as ways to handle unreliable network requests.

In plain words
What is it for?
Use it to record coding and architecture patterns, explain when to use them, and build a personal knowledge base for future work.
Why use it?
It prevents useful solutions and lessons from being lost after a difficult task is finished.

Skill for Codex

Written for Codex: installed under .codex/. Also seen: reads ~/.codex paths; mentions Codex.

This is junghwaYang/oh-my-codex's own configuration. It tells Codex how to work on oh-my-codex itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything oh-my-codex configures →

Reuse

Borrowing it

Nothing to install: this file belongs to junghwaYang/oh-my-codex. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/junghwaYang/oh-my-codex/main/.codex/skills/learner/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/junghwaYang/oh-my-codex

Made for: Codex.

Wrote 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.

agentmods badge for learner

README.md
[![agentmods](https://agentmods.dev/badge/skills/junghwayang/oh-my-codex/learner/github.svg)](https://agentmods.dev/skills/junghwayang/oh-my-codex/learner)
Your own site
<a href="https://agentmods.dev/skills/junghwayang/oh-my-codex/learner"><img src="https://agentmods.dev/badge/skills/junghwayang/oh-my-codex/learner/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for learner

Your own site · 80×15
<a href="https://agentmods.dev/skills/junghwayang/oh-my-codex/learner"><img src="https://agentmods.dev/badge/skills/junghwayang/oh-my-codex/learner.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 697 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 $0.00000 $0.00697
Opus 5.5 $0.00000 $0.00279
Sonnet 5.5 $0.00000 $0.00139
Haiku 4.5 $0.00000 $0.00070

Measured 2mo ago against content hash 1f6e764b5230, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

learner 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 2mo 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.

.codex/skills/learner/SKILL.md · 156 lines

How it starts

The opening of the file, as written. The whole thing — 156 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Learner Skill

Extract and reuse problem-solving patterns.

When to Use

  • After solving complex problems
  • Building personal knowledge base
  • Creating reusable solutions
  • Documenting lessons learned

How It Works

Problem → Solution → Pattern Extraction → Knowledge Base
                           │
                           ▼
                    Future Problems

Pattern Categories

Code Patterns

pattern:
  name: "Retry with Exponential Backoff"
  category: resilience
  problem: "API calls failing intermittently"
  solution: |
    async function retryWithBackoff(fn, maxRetries = 3) {
      for (let i = 0; i < maxRetries; i++) {
        try {
          return await fn();
        } catch (e) {
          if (i === maxRetries - 1) throw e;
          await sleep(Math.pow(2, i) * 1000);
        }
      }
    }
  when_to_use:
    - Unreliable external APIs
    - Network instability
    - Rate limiting
  when_not_to_use:
    - User-facing synchronous operations
    - Non-idempotent operations

Architecture Patterns

pattern:
  name: "Repository Pattern"
  category: architecture
  problem: "Direct database access scattered in code"
  solution: "Abstract data access behind repository interfaces"
  benefits:
    - Testability
    - Swappable implementations
    - Centralized queries

Debugging Patterns

pattern:
  name: "Binary Search Debugging"
  category: debugging
  problem: "Bug in large codebase"
  solution: |
    1. Identify working state (git bisect good)
    2. Identify broken state (git bisect bad)
    3. Binary search through commits
    4. Find exact commit that introduced bug

Learning Process

1. Capture

## Problem
{What was the issue?}

## Context
{What were the constraints?}

## Solution
{How did you solve it?}

## Key Insight
{What was the "aha" moment?}

## Reusability
{When would this apply again?}

2. Generalize

Specific Solution → Abstract Pattern → Reusable Template

Read the full file on GitHub · 156 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. 2mo ago First seen · 156 lines · 0 tokens per session scan A 1f6e764b5230

Subscribe to this mod's changes

learner is a skill published in the GitHub repository junghwaYang/oh-my-codex (5 stars, last pushed 8mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 697 tokens. 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 2026-08-31.

Related

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learner next to 6 skills from other repositories
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