Session management not working - sessionId parameter has no effect

[ShengJ96]

Environment

• codex-mcp-server version: 1.2.2 (via npx)
• Installation method: claude mcp add codex-cli -s user -- npx -y codex-mcp-server
• Client: Claude Code CLI
• OS: macOS Darwin 24.6.0

Description

The sessionId parameter does not preserve conversation context between calls. Each call to the codex tool starts a fresh conversation, regardless of using the same sessionId. Additionally, listSessions always returns "No active sessions".

Steps to Reproduce

1. Call codex tool with a sessionId:

{
  "prompt": "Remember the keyword ALPHA-BRAVO",
  "sessionId": "test-session-001",
  "sandbox": "read-only",
  "workingDirectory": "/path/to/project"
}

Response: "Got it. I've remembered the keyword ALPHA-BRAVO."

2. Immediately call codex again with the same sessionId:

{
  "prompt": "What keyword did I ask you to remember?",
  "sessionId": "test-session-001",
  "sandbox": "read-only",
  "workingDirectory": "/path/to/project"
}

Response: "I don't have any previous conversation context..."

3. Call listSessions:

{}

Response: "No active sessions"

Expected Behavior

According to session-management.md:

• Using the same sessionId should preserve conversation context
• listSessions should return session metadata including id, createdAt, lastAccessedAt, turnCount

Actual Behavior

• Each call starts a new conversation with no context
• listSessions always returns "No active sessions"
• Session data appears to not be stored or retrieved

Additional Context

Tested multiple times with different sessionId values. The issue is 100% reproducible. Basic codex and review tools work correctly for single-turn interactions.

[Flewrider]

We hit the same issue in both Codex CLI and Claude Code: using sessionId does not persist context and listSessions stays empty. I opened PR #94 with a minimal fix to create an in-memory session when a new sessionId is provided, plus docs clarifying the behavior. This makes sessionId-based multi-turn flows work as documented.

PR: #94