Description

openclaw doctor --fix crashes with Error: Session file path must be within sessions directory immediately after applying config migrations. More critically, the same error crashes the Discord guild message handler at runtime, preventing the bot from receiving any guild channel messages.

Environment

• Version: 2026.2.15 (npm/pnpm install, not git checkout)
• OS: macOS 26.2 (arm64)
• Setup: Multi-agent (main + secondary agent "luna"), 15 active sessions
• Install method: pnpm global

Runtime Impact

Gateway logs show:

discord channels unresolved: 823385078461497365/1465378022885429409, 823385078461497365/1466049469668790305, 823385078461497365/1467585640614068408

Error: Session file path must be within sessions directory

gateway/channels/discord handler failed: Error: Session file path must be within sessions directory

This means guild channel messages are completely broken — the Discord handler crashes on every inbound message. DMs work fine (different code path).

Steps to Reproduce

1. Multi-agent setup (main + secondary agent)
2. Configure Discord guild channels in allowlist
3. Send a message in an allowlisted guild channel
4. Handler crashes with session path error

Expected Behavior

Guild messages should be received and routed to the agent.

Actual Behavior

Handler crashes. Bot can send to channels but cannot receive messages.

Notes

• CHANGELOG references [Bug] Session file path validation failure in v2026.2.12 causing Telegram handler crashes #15141 which fixed this for "non-default agents and heartbeat/chat handlers" in reply runs — likely the same root cause in the Discord guild session resolution path.
• The "channels unresolved" log line may also be relevant — channels are listed but not resolving despite correct guild ID in config.