Feature request: expose Claude.ai Max plan usage counters in model context

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

When using Claude Code with a Max plan account, the model has zero visibility
into the user's remaining quota (Opus 20x session limit, weekly limits).
This data already exists server-side (it powers the 429 enforcement), but is
never passed to the model.

Proposed Solution

Suggestion: inject a lightweight read-only usage summary into the system
context at request time, e.g. { opus_session: 14/20, weekly_remaining: 3 }.

This would let the model proactively warn the user when approaching a limit,
without requiring them to manually check claude.ai/settings/usage.

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_