[FEATURE] config option or AGENTS.md entry to enforce plain English responses

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Claude Code sometimes uses jargon phrases in responses that are unnecessary and confusing, especially for non-native English speakers. Examples: "ground truth", "fast path", "migration path", "effective value".

A simple instruction like "use plain English, avoid jargon" in a CLAUDE.md file partially works, but is not reliable — it gets forgotten across context windows.

Proposed Solution

An official, supported way to enforce plain English responses. Either:

1. A config value (e.g. language: plain) that persists across sessions, or
2. Documentation on the recommended AGENTS.md / CLAUDE.md instruction that actually works reliably

Alternative Solutions

None known.

Priority

Medium - Would be very helpful

Feature Category

CLI commands and flags

Use Case Example

Non-native English speakers should not need to look up phrases like "ground truth" or "fast path" to understand a response.