learn

learn is a skill for Claude Code, Codex from MichaelYcJo/SpecSeal. It costs 85 tokens per session (442 once invoked), scanned A, original, MIT.

A project-memory tool for recording hard-won technical insights that are specific to a codebase. It stores details such as unusual dependency behavior, debugging discoveries, and reasons for design choices.

In plain words
What is it for?
Use it after solving a difficult, project-specific problem. It helps save actionable notes about bugs, configuration requirements, architectural decisions, workarounds, and performance findings.
Why use it?
It prevents future sessions from repeating investigations whose answers are not obvious from the code or general documentation. It keeps project-specific lessons available after the original debugging session.

Skill for Claude CodeCodex

Part of the specseal plugin — 23 skills, 3 agents, 3 hooks shipped together

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/michaelycjo/specseal/learn
Any agent
npx skills add MichaelYcJo/SpecSeal --skill learn
Clone the repo
git clone --depth 1 https://github.com/MichaelYcJo/SpecSeal

Made for: Claude Code, Codex.

Or install specseal, the plugin that ships this one along with the rest of its 23 skills, 3 agents, 3 hooks.

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 learn

README.md
[![agentmods](https://agentmods.dev/badge/skills/michaelycjo/specseal/learn.svg)](https://agentmods.dev/skills/michaelycjo/specseal/learn)
Your own site
<a href="https://agentmods.dev/skills/michaelycjo/specseal/learn"><img src="https://agentmods.dev/badge/skills/michaelycjo/specseal/learn.svg" alt="Measured on agentmods" height="20"></a>
Per session 85 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 442 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 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 $0.00085 $0.00442
Opus 5 $0.00043 $0.00221
Sonnet 5 $0.00017 $0.00088
Haiku 4.5 $0.00009 $0.00044

Measured 4d ago against content hash c41748e66262, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

learn 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 4d 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/learn/SKILL.md · 62 lines

What it actually says

learn — write down only what a search cannot return

Most of what a session discovers is recoverable: the code holds it, git holds it, a search answers it in five minutes. What is not recoverable is the thing that cost hours and leaves no trace — the dependency quirk, the reason an abstraction is shaped that way. Record that and nothing else.

Save Criteria (must meet ALL)

  1. Non-Googleable - Can't find answer in 5-min search
  2. Project-specific - Tied to this codebase/setup
  3. Hard-won - Required real debugging effort
  4. Actionable - Includes specific files, lines, code

What to Save

  • Bug patterns unique to this project
  • Non-obvious configuration requirements
  • Architectural decisions and their reasons
  • Dependency quirks and workarounds
  • Performance pitfalls discovered through profiling

What NOT to Save

  • General programming knowledge
  • Standard library usage
  • Anything in official docs
  • Temporary workarounds (save the real fix instead)

Storage

Save to: ~/.claude/projects/<project>/memory/

  • Use semantic filenames: auth-session-quirk.md, db-connection-pool.md
  • Keep each file focused on one insight
  • Update existing files rather than creating duplicates

Format

# [Short descriptive title]

## Problem
[What went wrong]

## Root Cause
[Why it happened - specific to this project]

## Solution
[What fixed it - with file paths and code]

## Prevention
[How to avoid this in the future]
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. 4d ago First seen · 62 lines · 85 tokens per session scan A c41748e66262

Subscribe to this mod's changes

learn is a skill published in the GitHub repository MichaelYcJo/SpecSeal (1 stars, last pushed today), licensed MIT. It adds 85 tokens to every session and 442 once invoked, about $0.0004 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 2026-08-31.

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