[MODEL] Opus 4.6/4.7 gives error when starting session with SKILL /session-start

Preflight Checklist

• [x] I have searched existing issues for similar behavior reports
• [x] This report does NOT contain sensitive information (API keys, passwords, etc.)

Type of Behavior Issue

Claude refused a reasonable request

What You Asked Claude to Do

I start and end a session with a SKILL: /session-start & /session-end

With Opus 4.6 or 4.7 this gives an error the last day.

The error does not occur when I switch to Sonnet.

What Claude Actually Did

Claude gave me an error:

⎿ API Error: Extra usage is required for 1M context · run /extra-usage to enable, or /model to switch to standard context

This is strange as the is only around 18KB loaded.

Expected Behavior

Claude should have: executed these SKILLS

Files Affected

No files affected.

Permission Mode

Accept Edits was OFF (manual approval required)

Can You Reproduce This?

Yes, every time with the same prompt

Steps to Reproduce

/session-start of /session-end give same error.

Claude Model

Opus

Relevant Conversation

⎿  API Error: Extra usage is required for 1M context · run /extra-usage to enable, or /model to switch to standard context

Impact

Medium - Extra work to undo changes

Claude Code Version

2.1.112

Platform

Anthropic API

Additional Context

I have a Claude Max subscription and did not reach my limit yet.