[QUESTION] "SessionId" vs. "Project Name"

[noahlz]

Claude Code 2.1.9 is going to support the CLAUDE_SESSION_ID environment variable for skills.

However, I've noticed that ccusage seems to have a little confusion over sessionId vs. project name. Example:

ccusage session --json
{
  "sessions": [
    {
      "sessionId": "-Users-noahlz-projects-myproject",
      "inputTokens": 1320207,
      "outputTokens": 68264,
      "cacheCreationTokens": 46395029,
      "cacheReadTokens": 486593734,
      "totalTokens": 534377234,
...

sessionId is named for the project directory i.e. \Users\noahlz\projects\myproject is converted to -Users-noahlz-projects-myproject in this case. These are actually project names according to Claude - see output of ls $HOME/.claude/projects

And now, 2.1.9 is adding the skill env variable $CLAUDE_SESSION_ID which makes clear that Claude Code considers session Ids to be GUID values:

anthropics/claude-code/issues/17188

anthropics/claude-code@5a91286

I don't have a bug report here, just hoping for clarification / explanation having sessionId being based on the project name. Am I missing something here?