# Ce Compound

Document a solved problem as a durable repo learning.

- Repository: https://github.com/EveryInc/compound-engineering-plugin (25818 stars)
- Category: Testing
- License: MIT
- Last updated: 2026-11-01
- Runs scripts: yes, review before use

## Install

Claude Code: `npx skills add EveryInc/compound-engineering-plugin --skill ce-compound -g -a claude-code -y`
Codex: `npx skills add EveryInc/compound-engineering-plugin --skill ce-compound -g -a codex -y`
Cursor: `npx skills add EveryInc/compound-engineering-plugin --skill ce-compound -g -a cursor -y`
Gemini CLI: `npx skills add EveryInc/compound-engineering-plugin --skill ce-compound -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add EveryInc/compound-engineering-plugin`

## Description

Document a solved problem as a durable repo learning. Use when verified work produced non-obvious reasoning absent from its final code, tests, or existing docs; avoid routine fixes whose artifacts already explain the lesson.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# /ce-compound

**Outcome:** one qualifying solved problem is written as a durable learning under `<root>/solutions/`, grounded against the current tree, discoverable by the next agent.

**Done:** a qualifying doc is written or updated, its frontmatter and claims validated, vocabulary capture recorded, and the mode's completion report emitted; when no learning qualifies, nothing is written and the report says why.

**One learning per run.** A session that produced several gets several sequential runs, never one batched run. Read `references/research.md`; it explains what batching breaks.


## Preconditions

Document only a problem that is solved and verified.

<!-- ce-durable-bar:start -->
A learning earns its place only when it holds durable project reasoning that is not readily recoverable from the final code, tests, types, comments, or existing documentation, and losing it would plausibly cause recurrence, material risk, or substantial rediscovery. Apply this counterfactual: if the learning document disappeared, would a future engineer reading the final implementation still be likely to repeat the mistake or redo substantial investigation? Completion, effort, and diff size do not establish eligibility.
<!-- ce-durable-bar:end -->

If the counterfactual fails, write nothing and report why. Judge this from the session rather than asking. An explicit invocation requests the judgment now but does not lower the bar.

An existing learning that became materially inaccurate or incomplete qualifies because leaving it would mislead. Update that learning instead of creating a duplicate.

`ce-compound` does not bootstrap `CONCEPTS.md`. It seeds the learning's own area as a side effect, never the whole repo. Send a standalone request to create or bootstrap that file to `ce-compound-refresh`, then exit.

## Mode Detection

The rest: https://github.com/EveryInc/compound-engineering-plugin/blob/HEAD/skills/ce-compound/SKILL.md