Feature: Surface conversation session ID for external reference (GitHub issues, PRs)

Problem

When using Claude Code to work on GitHub issues, I want to reference the specific conversation from the issue/PR for traceability. Currently there's no easy way to get the conversation's session ID.

The data already exists

Session IDs are already stored internally:

• Each conversation has a UUID (e.g., 9a99ddf9-7884-445b-8e43-efe371d9a492)
• ~/.claude/projects/{project}/sessions-index.json indexes all sessions with metadata
• /resume already supports resuming past conversations

What's missing is a way to surface the ID to the user.

Proposed Solution

1. Copy session ID: Add a "Copy Session ID" option in Past Conversations list and/or a /session-id command that prints the current session's UUID
2. Searchable by ID: Allow finding/resuming a conversation by its ID (e.g., /resume 9a99ddf9-...)

This enables workflows like:

gh issue comment 25 --body "CC session: 9a99ddf9-7884-445b-8e43-efe371d9a492"

Then later:

/resume 9a99ddf9-7884-445b-8e43-efe371d9a492

Use Case

• Work on a GitHub issue with Claude Code
• Record the session ID on the issue
• Months later, resume the exact conversation with full context when follow-up is needed

Environment

• Claude Code VSCode Extension (also relevant to CLI)