learn

A command that records important, non-obvious lessons from a coding session in nearby AGENTS.md files. These files give future coding agents instructions about a project.

In plain words
What is it for?
Use it after debugging or implementing a change to document surprising behavior, files that must change together, and project-specific testing or build knowledge.
Why use it?
It preserves discoveries that might otherwise be forgotten, such as hidden module relationships, configuration details, or useful test commands.

Command for Cursor

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 commands/codeready-toolchain/tarsy/learn
Clone the repo
git clone --depth 1 https://github.com/codeready-toolchain/tarsy

Made for: Cursor.

Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 146 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 $0.00015 $0.00146
Opus 5 $0.00008 $0.00073
Sonnet 5 $0.00003 $0.00029
Haiku 4.5 $0.00002 $0.00015

Measured 2d ago against content hash 0b1fbb61853e, 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 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.

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.

.cursor/commands/learn.md · 23 lines

What it actually says

Analyze this session and extract non-obvious learnings into AGENTS.md files.

AGENTS.md can exist at any directory level. Prefer the nearest package/feature directory over the repo root.

Include only:

  • Hidden relationships between modules
  • Surprising execution paths
  • Non-obvious env/config
  • Debugging breakthroughs
  • Build/test commands missing from docs
  • Files that must change together

Do not include obvious docs facts, standard language behavior, or session chatter.

Process: review session → choose scope → read existing AGENTS.md → append 1–3 line bullets → summarize what changed.

$ARGUMENTS

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 · 23 lines · 15 tokens per session scan A 0b1fbb61853e

Subscribe to this mod's changes

learn is a command published in the GitHub repository codeready-toolchain/tarsy (10 stars, last pushed 2d ago), licensed Apache-2.0. It adds 15 tokens to every session and 146 once invoked, about $0.0001 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.