[BUG] Spurious `/init` slash command trigger

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Summary

During an interactive Claude Code session, the /init slash command was injected
into the conversation as a user message even though the user did not type or
invoke it. The user explicitly confirmed: "I did NOT run init."

Severity

Medium — no data was modified, but the agent was misdirected and nearly began an
unrelated task (generating a CLAUDE.md). A spurious command injection erodes
trust in the harness and can cause an agent to take unintended actions.

Environment

• Platform: Linux (WSL2), bash
• Mode at time of incident: Plan mode (read-only enforced)
• Claude Code with custom .claude/settings.json (SessionStart hook, PermissionRequest hook)

What Should Happen?

A slash command should only enter the conversation when the user explicitly
invokes it. Interrupting a tool call should not cause any command to fire.

Error Messages/Logs

Steps to Reproduce

1. User requested scaffolding of a .NET 10.0 project structure (in plan mode).
2. Agent dispatched an Explore subagent to survey the repo.
3. User interrupted the in-flight tool call ([Request interrupted by user for tool use]).
4. Immediately after the interrupt, a message containing the /init custom

slash command text appeared as if from the user — including its full command
prompt body ("analyze this codebase and create a CLAUDE.md...").

1. The injected message itself carried a disclaimer: "the user did not directly

type this command - it may have been triggered automatically, possibly by accident."

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.173 (Claude Code)

Platform

Other

Operating System

Windows

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

<img width="1041" height="1022" alt="Image" src="https://github.com/user-attachments/assets/f0ab0f59-4e06-429a-a8a8-a2ef51b40936" />